CN106329524B - A kind of control method of micro-grid system and micro-grid system - Google Patents
A kind of control method of micro-grid system and micro-grid system Download PDFInfo
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- CN106329524B CN106329524B CN201611019730.1A CN201611019730A CN106329524B CN 106329524 B CN106329524 B CN 106329524B CN 201611019730 A CN201611019730 A CN 201611019730A CN 106329524 B CN106329524 B CN 106329524B
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- 238000004146 energy storage Methods 0.000 claims abstract description 123
- 238000004891 communication Methods 0.000 claims description 39
- 238000010248 power generation Methods 0.000 claims description 36
- 238000012544 monitoring process Methods 0.000 claims description 31
- 238000007726 management method Methods 0.000 description 20
- 238000012806 monitoring device Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013480 data collection Methods 0.000 description 2
- 238000013523 data management Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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- H02J3/005—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention provides the control method of a kind of micro-grid system and micro-grid system, it is related to micro-capacitance sensor technical field, it can be achieved that micro-grid system is smoothly switched by grid-connected to off-grid.Wherein, micro-grid system includes the first block, the second block and micro-capacitance sensor central control module；It is in front of off-network state enters isolated operation in system, the middle pressure energy-storage module of the second block provides power for whole loads in system；Be in after off-network state enters isolated operation in system, the micro-capacitance sensor of the first block for can the micro battery unit in module supply power to load cell；Power needed for power and load cell that the maximum discharge power of micro-capacitance sensor central control module centering pressure energy-storage module, micro battery unit can be supplied is predicted；And after system is in off-network state, under send instructions；The endpoint data acquisition and control module of first block put into load or are cut off under the control of instruction.Above-mentioned micro-grid system is used to independently power to load in off-network state.
Description
Technical Field
The invention relates to the technical field of distributed energy power generation and microgrid control, in particular to a microgrid system and a control method of the microgrid system.
Background
The micro-grid system is an intelligent controllable small-sized power grid system combining a distributed power generation system, energy storage and end load, and is an autonomous system capable of realizing self control, protection and management. The microgrid system mainly comprises a microgrid source unit for supplying power and a load unit for consuming power. Wherein, little power unit includes at least one little power, the load unit includes at least one load. Compared with an external power grid, the micro-grid system has two operation modes of grid connection and off-grid: when the external power grid normally supplies power, a micro power source in the micro power grid system is merged as an auxiliary power source and transmits power for a load together with the external power grid; when the external power grid fails, the micro-grid system is disconnected with the external power grid to form an island, and power is independently transmitted to the load.
However, the existing micro-grid system generally has the following problems: when an external power grid breaks down suddenly, the existing micro-grid system cannot immediately divide a proper island range according to the power which can be supplied by the micro-power source unit and the power required by the load unit, and before the proper island range is divided, the micro-power source in the micro-power source unit is not enough to supply power to all loads in the load unit, so that all the loads in the micro-grid system are in a power failure state before the proper island range is divided, that is, when the external power grid breaks down suddenly, the existing micro-grid system cannot guarantee smooth and seamless switching from a grid connection state to an off-grid state. In addition, the existing micro-grid system can only divide an island range once, and cannot ensure that the balance relationship between the power which can be supplied by the micro-power source unit and the power required by the load unit is maintained, so that the safety reliability and the energy utilization rate of the operation of the micro-grid system are reduced.
Disclosure of Invention
The invention provides a micro-grid system and a control method thereof, which can realize smooth and seamless switching of the micro-grid system from a grid-connected state to an off-grid state and improve the safety and reliability of the operation of the micro-grid system and the utilization rate of energy.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a microgrid system, which comprises at least one first block, at least one second block and a microgrid central control module connected with the first blocks and the second blocks, wherein the first blocks comprise connected microgrid energy supply modules and terminal data acquisition and control modules, and the second blocks comprise medium-voltage energy storage modules; when the micro-grid system is in a grid-connected state, the medium-voltage energy storage module is connected with an external power grid, and when the micro-grid system is in an off-grid state, the medium-voltage energy storage module is disconnected with the external power grid; the medium-voltage energy storage module is used for providing power for all loads in the micro-grid system before the micro-grid system is in an off-grid state and enters an island operation mode; when the micro-grid system is in a grid-connected state, the micro-grid energy supply module is connected with an external power grid, and when the micro-grid system is in an off-grid state, the micro-grid energy supply module is disconnected with the external power grid; the microgrid energy supply module comprises a microgrid unit and a load unit, the microgrid unit comprises at least one microgrid, the load unit comprises at least one load, and the microgrid unit is used for supplying power to the load unit after the microgrid system is in an off-grid state and enters an island operation mode; the micro-grid central control module is used for: predicting the maximum discharge power of the medium-voltage energy storage module, the power which can be supplied by the micro power supply unit and the power required by the load unit in real time; before the micro-grid system is in an off-grid state and enters an island operation mode, issuing a corresponding control instruction according to prediction data for predicting the maximum discharge power in real time, and controlling the medium-voltage energy storage module to provide power for all loads in the micro-grid system; after the micro-grid system is in an off-grid state and enters an island operation mode, continuously adjusting an island range according to prediction data for predicting the power which can be supplied by the micro-power source unit, the power required by the load unit in real time and the energy supply balance hysteresis margin of the micro-grid system, then determining the load which needs to be input and the load which needs to be cut off according to the adjusted island range and the importance of each load in the load unit, and issuing a corresponding control instruction; the terminal data acquisition and control module is used for correspondingly investing or cutting off the load in the load unit under the control of the control instruction issued by the micro-grid central control module, so that the power which can be supplied by the micro-power source unit is balanced with the power required by the load unit.
In the micro-grid system provided by the invention, the medium-voltage energy storage module is additionally arranged, and the power provided by the medium-voltage energy storage module is enough to meet the power required by all loads in the micro-grid system, so that when the external power grid has sudden failure and needs to be disconnected with the micro-grid system, the micro-grid system can firstly utilize the medium-voltage energy storage module to supply power to all the loads in the micro-grid system in the process of switching from a grid-connected state to an off-grid state, and a certain time is reserved for dividing a proper island range for the micro-grid system, thereby ensuring the smooth and seamless switching of the micro-grid system from the grid-connected state to the off-grid state. In addition, by utilizing the micro-grid system provided by the invention, the relation between the electric energy which can be supplied by the micro-power supply in the micro-grid system and the electric energy required by the load can be judged by predicting the electric energy which can be supplied by the micro-power supply in the micro-grid system in real time, and when the electric energy and the electric energy are in a non-balanced state, the load is put into or cut off by adjusting the island range, so that the relation between the electric energy which can be supplied by the micro-power supply and the electric energy required by the load is quickly restored to be balanced, and the safety reliability.
A second aspect of the present invention provides a control method for a microgrid system, the control method being applied to the microgrid system according to the first aspect of the present invention, characterized in that the microgrid control method comprises: step S1: predicting the maximum discharge power of the medium-voltage energy storage module, the power which can be supplied by each micro power supply in the micro power supply unit and the power required by each load in the load unit in real time; step S2: calculating the total power required by all loads of the micro-grid system in real time; step S3: judging whether the micro-grid system and an external power grid need to be disconnected in real time, if so, judging whether the predicted maximum discharge power of the medium-voltage energy storage module at the current time point is greater than or equal to the calculated total power required by all loads in the micro-grid system, if so, entering a step S4, and if not, entering a step S7; step S4: calculating the maximum power supply time of the medium-voltage energy storage module to all loads of the micro-grid system; step S5: disconnecting the connection between the micro-grid system and an external power grid, supplying power to all loads in the micro-grid system through the medium-voltage energy storage module within the maximum power supply time, and determining a first island range according to the power which can be supplied by each micro-power supply in the micro-power supply unit and the power required by each load in the load unit predicted in real time to enable the micro-grid system to enter an island operation mode; step S6: judging whether the power which can be supplied by the micro power source unit and the power required by all the loads covered in the current island range are balanced in real time, if not, readjusting the island range to enable the power which can be supplied by the micro power source unit and the power required by all the loads covered in the adjusted island range to be balanced again; step S7: and keeping the micro-grid system and the external power grid connected continuously, wherein the micro-grid system does not work.
The beneficial effects of the control method of the microgrid system provided by the second aspect of the invention are the same as those of the microgrid system provided by the first aspect, and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a microgrid system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram ii of a microgrid system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram three of a microgrid system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a microgrid system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram five of a microgrid system provided by an embodiment of the present invention;
fig. 6 is a sixth schematic structural diagram of a microgrid system provided by an embodiment of the present invention;
fig. 7 is a seventh schematic structural diagram of a microgrid system provided by an embodiment of the present invention;
fig. 8 is an eighth schematic structural diagram of a microgrid system provided by an embodiment of the present invention;
fig. 9 is a flowchart of a method for controlling a microgrid system according to an embodiment of the present invention.
Description of reference numerals:
1-a first block; 11-a microgrid energy supply module;
111-a micro power supply unit; 1110-micro power supply;
1111-photovoltaic power generation micro power supply; 1112-a wind power micro power supply;
1113-generator micropower; 1114-an energy storage micro power supply;
112-load cell; 1120-load;
113-controllable micro power switch; 114-a controllable load switch;
115-controllable voltage switch; 116-grid-connected/off-grid control switch;
12-terminal data acquisition and control module; 121-a micro-power controller;
122 — a first load controller; 123-a second load controller;
124-a data acquisition monitoring unit; 1241-electrical parameter collecting equipment;
1242-monitoring devices; 1243-intelligent acquisition equipment;
1244-electric real-time acquisition equipment; 1245-energy storage monitoring equipment;
1246-controller monitoring device; 13-a network management unit;
131-user side communication converter; 132-a communication manager;
1' -the second block; 11' -a medium voltage energy storage module;
111' -power type energy storage micro power supply; 12' -a power type energy storage micro-power controller;
13' -controllable power type energy storage micro power switch; 14' -a transformer;
2-a microgrid central control module; 21-micro power source prediction unit;
211-a photovoltaic power generation predictor unit; 212-wind power generation predictor unit;
213-generator predictor subunit; 214-an energy storage predictor unit;
22-a load prediction unit; 23-a database;
24-a microgrid central controller; 25-weather forecast unit;
26-a medium voltage energy storage prediction unit; 3-an external power grid;
4-a third load controller; 5-a total data acquisition monitoring unit;
6-a total network management unit; and 7, a system end communication converter.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that specific numbers of the first block, the second block, the power type energy storage micro power supply, the photovoltaic power generation micro power supply, the wind power generation micro power supply, the generator micro power supply, the energy type energy storage micro power supply, the power type energy storage micro power controller, the micro power controller and the first load controller shown in the drawings of the following embodiments are only schematic illustrations and do not represent respective actual numbers.
Example one
As shown in fig. 1, the present embodiment provides a microgrid system, which includes at least one first block 1, at least one second block 1', and a microgrid central control module 2 connected to each first block 1 and each second block 1', wherein the first block 1 includes a microgrid energy supply module 11 and a tail end data acquisition and control module 12 connected to each other, and the second block 1 'includes a medium-voltage energy storage module 11'.
When the micro-grid system is in a grid-connected state, the medium-voltage energy storage module 11 'is connected with the external power grid 3, and when the micro-grid system is in an off-grid state, the medium-voltage energy storage module 11' is disconnected with the external power grid 3. The medium voltage energy storage module 11' is used to provide power to all loads 1120 in the microgrid system before the microgrid system is in an off-grid state and enters an island mode of operation.
When the micro-grid system is in a grid-connected state, the micro-grid energy supply module 11 is connected with the external power grid 3, and when the micro-grid system is in an off-grid state, the micro-grid energy supply module 11 is disconnected with the external power grid 3. The microgrid energy supply module 11 comprises a microgrid unit 111 and a load unit 112, the microgrid unit 111 comprises at least one microgrid 1110, the load unit 112 comprises at least one load 1120, and the microgrid unit 111 is used for supplying power to the load unit 112 after the microgrid system is in an off-grid state and enters an island operation mode.
The microgrid central control module 2 is used for: predicting the maximum discharge power of the medium-voltage energy storage module 11', the power which can be supplied by the micro power unit 111 and the power required by the load unit 112 in real time; before the microgrid system is in an off-grid state and enters an island operation mode, issuing a corresponding control instruction according to prediction data for predicting the maximum discharge power in real time, and controlling a medium-voltage energy storage module 11' to provide power for all loads 1120 in the microgrid system; after the microgrid system is in an off-grid state and enters an island operation mode, continuously adjusting an island range according to prediction data for predicting the power which can be supplied by the microgrid unit 111 and the power required by the load unit 112 in real time and the supply energy balance hysteresis margin of the microgrid system, then determining the load which needs to be input and the load which needs to be cut according to the adjusted island range and the importance of each load 1120 in the load unit 112, and issuing a corresponding control instruction.
The end data collecting and controlling module 12 is configured to perform corresponding investing or cutting of the load in the load unit 112 under the control of the control instruction issued by the microgrid central controlling module 2, so that the power that can be supplied by the microgrid unit 111 is balanced with the power required by the load unit 112.
In the microgrid system provided in this embodiment, the medium-voltage energy storage module 11' is additionally provided, and the power provided by the medium-voltage energy storage module 11' is enough to meet the power required by all the loads 1120 in the microgrid system, so that when an external power grid 3 has an emergency fault and needs to be disconnected from the microgrid system, the microgrid system can firstly utilize the medium-voltage energy storage module 11' to supply power to all the loads 1120 in the microgrid system in the process of switching from a grid-connected state to an off-grid state, so that a certain time is reserved for dividing a proper island range for the microgrid system, and thereby smooth and seamless switching of the microgrid system from the grid-connected state to the off-grid state is ensured. In addition, by using the microgrid system provided by the embodiment, the relation between the power which can be supplied by the microgrid 1110 and the power required by the load 1120 in the microgrid system can be judged by predicting the power which can be supplied by the microgrid 1110 and the power required by the load 1120 in real time, and when the power and the power are in an unbalanced state, the load 1120 is put into or removed by adjusting the island range, so that the relation between the power which can be supplied by the microgrid 1110 and the power required by the load 1120 is quickly restored to be balanced, and the safety reliability and the energy utilization rate of the operation of the microgrid system are improved.
In particular, the medium voltage energy storage module 11 'may comprise at least one power type energy storage micro power source 111'. The power type energy storage micro power source 111' is a high-power energy storage micro power source capable of providing high power, and the medium-voltage energy storage module 11' supplies power to all loads 1120 in the microgrid system through the included power type energy storage micro power source 111 '.
As shown in fig. 2, the second block 1 'may further include at least one power type energy storage micro-power controller 12' (denoted by CC in the figure), where the at least one power type energy storage micro-power controller 12 'is connected to at least one power type energy storage micro-power 111' included in the medium-voltage energy storage module 11 'in a one-to-one correspondence manner, and the power type energy storage micro-power controller 12' is configured to receive a control instruction issued by the micro-grid central control module 2, control the corresponding power type energy storage micro-power 111 'to perform off-grid/grid-connection operation mode switching, and feed back a working state of the corresponding power type energy storage micro-power 111' to the micro-grid central control module 2.
In addition, the second block 1' may further comprise at least one controllable power type energy storage micro power switch 13', a transformer 14', a low voltage bus and a medium voltage bus. At least one controllable power type energy storage micro power source switch 13' is connected with each power type energy storage micro power source 111' and the corresponding power type energy storage micro power source controller 12' in a one-to-one correspondence manner; the low-voltage bus is used for connecting a low-voltage end of the transformer 14 'with each controllable power type energy storage micro power switch 13'; the medium voltage bus is used to connect the high voltage side of the transformer 14' with the external grid 3.
In the microgrid system provided in the present embodiment, the terminal data acquisition and control module in the first block 1 includes at least one microgrid controller 121 (denoted by MC n in the figure, n is a positive integer), at least one first load controller 122 (denoted by LC n in the figure, n is a positive integer), and a second load controller 123 (denoted by LC n in the figure, n is a positive integer).
At least one of the micro power controllers 121 is connected to at least one of the micro power sources 1110 included in the micro power source unit 111 in a one-to-one correspondence. The micro-power controller 121 is configured to control the corresponding micro-power source 1110 to perform off-grid/grid-connected work mode switching, control the work power of the corresponding micro-power source 1110, feed back the work state of the corresponding micro-power source 1110 to the micro-grid central control module 2, and receive an instruction issued by the micro-grid central control module 2; at least one of the first load controllers 122 is connected to at least one of the loads 1120 included in the load unit 112 in a one-to-one correspondence manner, and the first load controller 122 is configured to control the input or the cut-off of the corresponding load 1120 and is further configured to receive an instruction issued by the microgrid central control module 2; each of the micro-power controllers 121 and each of the first load controllers 122 are connected to a second load controller 123, and the second load controller 123 is configured to receive an instruction sent by the micro-grid central control module 2.
For example, in the first block shown in fig. 2, the primary power controller MC1, the primary power controller MC2, the first load controller LC1, the second load controller LC 9; the micro-power controller MC1 is connected with a corresponding micro-power source (represented by micro-power source 1 in the figure), the micro-power controller MC2 is connected with a corresponding micro-power source (represented by micro-power source 2 in the figure), the first load controller LC1 is connected with a corresponding load (represented by load 1 in the figure), and the second load controller LC9 is connected among the first load controller LC1, the micro-power controller MC1 and the micro-power controller MC 2. After the microgrid central control module 2 issues an instruction containing information related to the load which needs to be put in and the load which needs to be cut off to the terminal data acquisition and control module 12, the microgrid controller MC1 and the microgrid controller MC2 in the terminal data acquisition and control module 12 control the corresponding microgrid to perform off-grid/grid-connected work mode switching according to the received instruction, control the working power of the microgrid which needs to be supplied with power, and feed back the working state of the corresponding microgrid to the microgrid central control module 2; the first load controller LC1 performs an operation of putting in or cutting out a load according to the received instruction.
In addition, the terminal data collection and control module further includes a data collection monitoring unit 124. The data acquisition and monitoring unit 124 is connected to the second load controller 123, and is also connected to each of the micro-power controllers 121 and each of the first load controllers 122. For example, in the first block shown in fig. 2, a data acquisition monitoring unit 124 is included, and the data acquisition monitoring unit 124 is connected to the second load controller LC9, and is further connected to the micro-power controller MC1, the micro-power controller MC2, and the first load controller LC 1. The data acquisition monitoring unit 124 is configured to: real-time electrical parameters of each micro power supply 1110 are collected in real time through each micro power supply controller 121, and the running state of each micro power supply 1110 is monitored; the real-time electrical parameters of each load 1120 are collected in real time through each first load controller 122 and each second load controller 123, and the running state of each load 1120 is monitored; and transmits the electrical parameters of each micro power source 1110, the electrical parameters of each load 1120, the operating state data of each micro power source 1110 and the operating state data of each load 1120 to the microgrid central control module 2.
Specifically, as shown in fig. 3, the data acquisition and monitoring unit 124 includes an electrical parameter acquisition device 1241 and a monitoring device 1242.
The electrical parameter acquisition equipment 1241 is composed of intelligent acquisition equipment 1243 such as an intelligent instrument, a relay protection device, a Programmable Logic Controller (PLC), a mutual inductor and the like, the electrical parameter acquisition equipment 1241 is used for acquiring electrical parameters of each loop of the microgrid system, and the acquired electrical parameters specifically comprise real-time electrical parameters of a micro power supply corresponding to each micro power supply 121 acquired by each micro power supply controller 121 in real time in a block where the micro power supply is located, and real-time electrical parameters of loads corresponding to each load controller acquired by a first load controller 122 and a second load controller 123 in the block where the micro power supply is located; and transmits the collected electrical parameters to the microgrid central control module 2.
The monitoring device 1242 is composed of an electrical real-time acquisition device 1244 such as a high-speed data acquisition card and a signal converter, the monitoring device includes a controller monitoring device 1246, and the controller monitoring device 1246 is used for monitoring real-time electrical parameters of each micro power supply and each load of a block where the electrical parameter acquisition device 1241 is located, further monitoring the operation state of each micro power supply and each load, and transmitting the monitored electrical parameter data and the monitored operation state data to the microgrid central control module 2.
The microgrid energy supply module 11 in the first block 1 includes, in addition to the microgrid elements 111 and load elements 112, at least one controllable microgrid switch 113, at least one controllable load switch 114, a transformer 14', a controllable voltage switch 115, a grid-connected/off-grid control switch 116, a low-voltage bus and a medium-voltage bus.
Wherein, at least one controllable micro power switch 113 is connected to each micro power 1110 and its corresponding micro power controller 121 in a one-to-one correspondence; at least one controllable load switch 114 is connected to each load 1120 and its corresponding load controller in a one-to-one correspondence; the low-voltage bus is used for connecting the low-voltage end of the transformer 14' with each controllable micro-power switch 113 and each controllable load switch 114; the controllable voltage switch 115 is arranged on the low-voltage bus and is connected with the second load controller 123; the medium voltage bus is used for connecting the high voltage end of the transformer 14' with the external power grid 3; the grid-connected/off-grid control switch 116 is disposed on the medium voltage bus.
It should be noted that, when the controllable voltage switch 115 in the first block 1 is closed, the transformer 14' is connected to the micro power source unit 111 and the load unit 113, which indicates that power needs to be supplied to the load 1120 of the block, so that the second load controller 123 connected to the controllable voltage switch 115 is in a working state, and the second load controller 123 transmits a command of putting in or cutting off the load issued by the micro grid central control module 2 to the first load controller 122, so that the first load controller 122 correspondingly puts in or cuts off the load. When the controllable voltage switch 115 is turned off, the transformer 14' is disconnected from the micro power unit 111 and the load unit 113, which means that power is not required to be supplied to the load 1120 of the block, and therefore, the second load controller 123 connected to the controllable voltage switch 115 is in a non-operating state, i.e. it is not required to transmit to the first load controller 122 an instruction containing information related to the determination of the loads to be put into and the loads to be cut off, which is issued by the micro grid central controller 24.
During the operation of the whole microgrid system, the connection relationship between the microgrid system and the external power grid 3, i.e. the on-off state of the grid-connected/off-grid control switch 116, needs to be monitored in real time. When the grid-connected/off-grid control switch 116 is monitored to be closed and the microgrid system is in a grid-connected state, the microgrid system exits an island operation mode, and the microgrid system only performs operation of power prediction on power which can be supplied by the microgrid 1110 and power needed by the load 1120; when the grid-connected/off-grid control switch 116 is monitored to be disconnected and the microgrid system is in an off-grid state, the microgrid system continues to maintain an island operation mode, and an island range is adjusted according to the predicted relationship between the power which can be supplied by the microgrid 1110 and the power required by the load 1120.
As shown in fig. 2, the microgrid system further includes a third load controller 4 disposed outside each first block 1 and each second block 1', and a total data acquisition monitoring unit 5 disposed outside each first block 1 and each second block 1'.
The third load controller 4 is connected to the grid-connected/off-grid control switch 116, and is configured to receive a control instruction issued by the microgrid central control module 2. Specifically, when the grid-connected/grid-disconnected control switch 116 is turned off, the microgrid system is in a grid-disconnected state, the third load controller 4 is in a working state, and the third load controller 4 is configured to transmit a command for putting in or cutting off a load issued by the microgrid central control module 2 to the second load controllers 123 of the first blocks 1; when the grid-connected/off-grid control switch 116 is closed, the microgrid system is connected to the external power grid 3, and the microgrid system is in a grid-connected state, and it is not necessary to independently supply power to the loads 1120 in the first block 1, and therefore, the third load controller 4 is in a non-operating state, that is, it is not necessary to transmit instructions containing information about the loads determined to be put in and the loads to be cut off, which are issued by the microgrid central control module 2, to the second load controller 123 in the first block 1.
The total data acquisition monitoring unit 5 is connected with the third load controller 4, and the total data acquisition monitoring unit 5 is used for: acquiring electrical parameters of each micro power source 1110, electrical parameters of each load 1120, operation state data of each micro power source 1110 and operation state data of each load 1120 in each first block 1 from the data acquisition monitoring unit 124 of each first block 1, and monitoring the operation state of each first block 1; and transmits the electrical parameters of each micro power source 1110, the electrical parameters of each load 1120, the operation state data of each micro power source 1110, the operation state data of each load 1120, and the operation state data of each block 1 to the micro grid central control module 2.
The first block 1 and the second block 1' in the microgrid system further include a network management unit 13, the network management unit 13 of the first block 1 is connected with the data acquisition and monitoring unit 124, the second load controller 123, the respective microgrid controllers 121 and the respective first load controllers 122 of the block in which the network management unit 13 is located through a user-side communication bus, and the network management unit 13 of the second block 1' is connected with the power-type energy storage microgrid controller 12' of the block in which the network management unit 13 is located through a user-side communication bus.
In addition, the microgrid system further comprises a total network management unit 6 arranged outside each first block 1 and each second block 1', and a system-side communication converter 7 arranged outside each first block 1 and each second block 1'. The main network management unit 6 is connected with the total data acquisition monitoring unit 5 and the third load controller 4 through a user side communication bus; the system end communication converter 7, the total network management unit 6 and the network management units 13 of the first blocks 1 and the second blocks 1' are connected in series through a network communication bus, and the system end communication converter 7 is also connected with the microgrid central control module 2 through the network communication bus.
Specifically, as shown in fig. 4, the network management unit 13 includes a client communication converter 131 and a communication manager 132. Wherein, the user communication converter 131, the system communication converter 7 and the total network management unit 6 in each network management unit 13 are connected in series through a network communication bus; the communication manager 132 is connected to the client communication converter 131 through the client communication bus, the communication manager 132 in the first block 1 is connected to the data acquisition monitoring unit 124, the second load controller 123, the micro-power controllers 121 and the first load controllers 122 in the block through the client communication bus, and the communication manager 132 in the second block 1 'is connected to the power-type energy storage micro-power controllers 12' in the block.
The network management unit 13, the total network management unit 6 and the system end communication exchanger 7 are units for data management and transmission in the micro-grid system, and are used for realizing data management and data transmission of the micro-grid system, and the network management unit 13 and the total network management unit 6 in each block are connected in series to form a ring network, so that the communication reliability is improved.
As shown in fig. 5, the microgrid central control module 2 may specifically include a medium-voltage energy storage prediction unit 26, a microgrid prediction unit 21, a load prediction unit 22, a database 23, and a microgrid central controller 24.
With reference to fig. 1 and 5, the medium-voltage energy storage predicting unit 26 is configured to predict the maximum discharge power of the medium-voltage energy storage module 11' in real time, and the micro power source predicting unit 21 is configured to predict the power that can be supplied by the micro power source unit 111 in real time; the load prediction unit 22 is used to predict the power required by the load unit 112 in real time. The database 23 is connected with the micro power source prediction unit 21, the load prediction unit 22 and the medium-voltage energy storage prediction unit 26, and provides data required for real-time prediction for the micro power source prediction unit 21 and the load prediction unit 22; the database 23 stores the data of the energy supply balance hysteresis margin of the microgrid system in advance; the microgrid central controller 24 is connected to the microgrid prediction unit 21, the load prediction unit 22, the medium-voltage energy storage prediction unit 26 and the database 23, and the microgrid central controller 24 is configured to: acquiring real-time predicted prediction data from the medium-voltage energy storage prediction unit 26, issuing a corresponding control instruction according to the real-time predicted prediction data, and controlling the medium-voltage energy storage module 11' to supply power to all loads 1120 in the microgrid system; acquiring real-time predicted prediction data from the micro power source prediction unit 21 and the load prediction unit 22, acquiring power supply and energy balance hysteresis margin data from the database 23, continuously adjusting an island range according to the real-time predicted prediction data and the power supply and energy balance hysteresis margin of the micro grid system, then determining loads needing to be input and loads needing to be cut in the load unit 112 according to the adjusted island range and the importance of each load in the load unit 112, and issuing corresponding control instructions.
Furthermore, the database 23 needs to store history data of load electricity usage; the history data of the load electricity consumption is transmitted to the load prediction unit 22 through the database 23 as a type of data for predicting the power required by the load. The database 23 also needs to store the micro-power generation history data, which is transmitted to the micro-power prediction unit 21 through the database 23 as a type of data required for predicting the power that can be supplied by the micro-power.
Based on the prediction data predicted by the micro power prediction unit 21 and the load prediction unit 22 in real time, the micro grid central controller 24 continuously adjusts the island range. In order to prevent the microgrid central controller 24 from frequently issuing control commands, the supply energy balance hysteresis margin needs to be stored in the database 23 in advance. When the difference between the power supplied by the micro power source 1110 and the power required by the load 1120 exceeds the range of the energy supply balance hysteresis margin, the micro grid central controller 24 needs to readjust the island range and issue a corresponding instruction; when the difference between the power supplied by the micro power source 1110 and the power required by the load 1120 is within the supply energy balance hysteresis margin range, the micro grid central controller 24 does not need to readjust the island range, and does not need to issue a corresponding instruction. The energy balance hysteresis margin is set, and the micro-grid system can be guaranteed to have certain absorption capacity for the accuracy of predicted data and sudden change of load.
As shown in fig. 6, the micro power source units 111 of each first block 1 may specifically include at least one of a photovoltaic micro power source 1111, a wind power generation micro power source 1112, a generator micro power source 1113, and an energy storage micro power source 1114, and the micro power sources included in the micro power source units 111 of each first block 1 may be different.
It should be noted that the energy-type energy-storage micro-power source 1114 is an energy-storage micro-power source with a smaller power, and unlike the power-type energy-storage micro-power source 111', the energy-type energy-storage micro-power source 1114 supplies power to the load 1120 covered by the islanding range after the micro-grid system enters the islanding operation mode.
Preferably, when the micro power source unit 111 includes at least one of a photovoltaic power generation micro power source 1111 and a wind power generation micro power source 1112; the micro power prediction unit 21 includes at least one of a photovoltaic power generation prediction subunit 211 and a wind power generation prediction subunit 212, and the type of the prediction subunit included in the micro power prediction unit 21 is the same as the type of the micro power source included in the micro power unit 111.
For example, when the micro power source unit 111 includes both the photovoltaic micro power source 1111 and the wind power generation micro power source 1112, correspondingly, as shown in fig. 7, the micro power source prediction unit 21 includes the photovoltaic power generation prediction subunit 211 and the wind power generation prediction subunit 212. Since the micro power prediction unit 21 includes the photovoltaic generation micro power source 1111 and the wind power generation micro power source 1112, it is necessary to predict the power that can be supplied by the photovoltaic generation micro power source 1111 based on the sunlight intensity prediction data and predict the power that can be supplied by the wind power generation micro power source 1112 based on the wind intensity prediction data. In order to obtain the weather prediction data, a weather forecast unit 25 needs to be arranged in the microgrid central control module 2. The weather forecast unit 25 is connected to the database 23, and is configured to acquire weather data such as solar light intensity, wind power intensity, and the like at a future time, transmit the acquired weather forecast data to the database 23 as a type of data required for real-time forecasting, and transmit the received weather data to the micro-power source forecasting unit 21 by the database 23, so as to provide a type of forecast data for the micro-power source forecasting unit 21 to forecast the power that can be supplied by the micro-power source 1110.
In addition, the photovoltaic power generation prediction subunit 211 predicts the power that can be supplied by the photovoltaic power generation micro power supply 1111, and can predict data according to the historical data of the power supply of the photovoltaic power generation micro power supply and the sunlight intensity, and can further predict the data according to the historical data of the sunlight intensity, so as to improve the accuracy of the predicted data; similarly, the wind power generation prediction subunit 212 may predict the power that can be supplied by the wind power generation micro power supply 1112 according to historical data of wind power generation micro power supply and wind strength prediction data, and may further predict the power according to historical data of wind strength. Therefore, the solar light intensity history data and the wind power intensity history data may be further stored in the database 23 in advance.
In summary, the photovoltaic power generation prediction subunit 211 may predict the power that can be supplied by the photovoltaic power generation micro power source 1111 according to the historical data of power supply of the photovoltaic power generation micro power source, the historical data of solar light intensity, the predicted data of solar light intensity, and the like; the wind power generation prediction subunit 212 may predict the power that can be supplied by the wind power generation micro power source 1112 based on the historical data of the power supply of the wind power generation micro power source, the historical data of the wind power intensity, the wind power intensity prediction data, and the like; the load prediction unit 22 may predict the power required by the load 1120 based on the history data of the load electricity usage, the solar intensity history data, the wind intensity history data, the solar intensity prediction data, the wind intensity prediction data, and the like.
Based on fig. 6, the micro power supply preferably supplies power to the load 1120 by charging and discharging the energy storage micro power source 1114, the charging power of the energy storage micro power source 1114 corresponds to the power that can be supplied by the micro power source, and the discharging power of the energy storage micro power source 1114 corresponds to the power required by the load 1120, so that in order to ensure the safe operation of the micro grid system, the energy storage micro power source 1114 is firstly ensured to operate in a safe state. In order to provide a comparison parameter for determining whether the energy storage micro power source 1114 is safely operated, the energy storage capacity and the maximum charging and discharging power of the energy storage micro power source 1114 need to be input into the database of the micro grid central control module 2, and the balance between the power that can be supplied by the micro power source 1110 and the power required by the load 1120 can be realized only when the operation state of the energy storage micro power source 1114 is within the range of the hysteresis margin for balancing the supply energy.
When the micro power unit 111 includes the energy storage micro power 1114, specifically, as shown in fig. 8, the monitoring device 1242 further includes an energy storage monitoring device 1245, and the energy storage monitoring device 1245 is configured to monitor real-time electrical parameters of the energy storage micro power 1114 in the block where the electrical parameter collecting device 1241 collects, so as to monitor an operation state of the energy storage micro power 1114, and transmit the monitored electrical parameter data and the monitored operation state data to the micro grid central control module 2.
It should be noted that, in the microgrid system as described above, the medium-voltage energy storage module 11' and the microgrid energy supply module 11 belong to primary devices for direct power supply and direct power utilization, and the microgrid central control module 2, the tail end data acquisition and control module 12, the total data acquisition and monitoring unit 5, the network management unit 13, the total network management unit 6 and the system end communication converter 7 belong to secondary devices for monitoring, controlling and protecting the primary devices.
Example two
The embodiment provides a method for controlling a microgrid system, which is applied to the microgrid system as described in the first embodiment, and as shown in fig. 9, the method for controlling a microgrid specifically includes:
step S1: real-time prediction of maximum discharge power P of medium-voltage energy storage moduleMAXThe power which can be supplied by each micro power supply in the micro power supply unit and the power required by each load in the load unit;
step S2: calculating total power P required by all loads of micro-grid system in real timeL；
Step S3: judging whether the micro-grid system and an external power grid need to be disconnected in real time, and if so, judging the predicted maximum discharge power P of the medium-voltage energy storage module at the current time pointMAXWhether it is greater than or equal to the calculated total power P required by all the loads in the microgrid systemLIf yes, the process proceeds to step S4, and if no, the process proceeds to step S7;
step S4: calculating the maximum power supply time T of the medium-voltage energy storage module to all loads of the micro-grid system;
step S5: disconnecting the connection between the micro-grid system and an external power grid, supplying power to all loads in the micro-grid system through the medium-voltage energy storage module within the maximum power supply time T, and determining a first island range according to the power which can be supplied by each micro-power supply in the micro-power supply unit and the power required by each load in the load unit predicted in real time so that the micro-grid system enters an island operation mode;
step S6: judging whether the power which can be supplied by the micro power source unit and the power required by all the loads covered in the current island range are balanced in real time, if not, readjusting the island range to enable the power which can be supplied by the micro power source unit and the power required by all the loads covered in the adjusted island range to be balanced again;
step S7: and keeping the micro-grid system and the external power grid connected continuously, and keeping the micro-grid system not working.
In step S5, the first islanding range is determined by cutting off a part of the load of low importance, and in step S6, the islanding range is adjusted by cutting off the load of low importance or by including a part of the load of high importance which is not supplied with power.
In the control method of the microgrid system provided by the embodiment, when an external power grid has a sudden failure and needs to be disconnected from the microgrid system, and when the maximum discharge power of the medium-voltage energy storage module is greater than or equal to the power required by all loads, all loads in the microgrid system can be supplied with power by using the medium-voltage energy storage module, a certain time can be reserved for dividing a proper island range for the microgrid system, and therefore smooth and seamless switching from a grid-connected state to an off-grid state of the microgrid system is ensured. In addition, by using the control method of the microgrid system provided by the embodiment, the power which can be supplied by the microgrid and the power required by the load can be predicted in real time, and the relationship between the power which can be supplied by the microgrid and the power required by the load can be judged in real time, so that when the microgrid and the load are in a non-equilibrium state, the relationship between the power which can be supplied by the microgrid and the power required by the load can be quickly restored to be in equilibrium by adjusting the island range, and the safety reliability and the energy utilization rate of the operation of the microgrid system are improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (13)
1. The microgrid system is characterized by comprising at least one first block, at least one second block and a microgrid central control module connected with the first blocks and the second blocks, wherein the first blocks comprise microgrid energy supply modules and tail end data acquisition and control modules which are connected, and the second blocks comprise medium-voltage energy storage modules; wherein,
when the micro-grid system is in a grid-connected state, the medium-voltage energy storage module is connected with an external power grid, and when the micro-grid system is in an off-grid state, the medium-voltage energy storage module is disconnected with the external power grid; the medium-voltage energy storage module is used for providing power for all loads in the micro-grid system before the micro-grid system is in an off-grid state and enters an island operation mode;
when the micro-grid system is in a grid-connected state, the micro-grid energy supply module is connected with an external power grid, and when the micro-grid system is in an off-grid state, the micro-grid energy supply module is disconnected with the external power grid; the microgrid energy supply module comprises a microgrid unit and a load unit, the microgrid unit comprises at least one microgrid, the load unit comprises at least one load, and the microgrid unit is used for supplying power to the load unit after the microgrid system is in an off-grid state and enters an island operation mode;
the micro-grid central control module is used for: predicting the maximum discharge power of the medium-voltage energy storage module, the power which can be supplied by the micro power supply unit and the power required by the load unit in real time; before the micro-grid system is in an off-grid state and enters an island operation mode, issuing a corresponding control instruction according to prediction data for predicting the maximum discharge power in real time, and controlling the medium-voltage energy storage module to provide power for all loads in the micro-grid system; after the micro-grid system is in an off-grid state and enters an island operation mode, continuously adjusting an island range according to prediction data for predicting the power which can be supplied by the micro-power source unit, the power required by the load unit in real time and the energy supply balance hysteresis margin of the micro-grid system, then determining the load which needs to be input and the load which needs to be cut off according to the adjusted island range and the importance of each load in the load unit, and issuing a corresponding control instruction;
the terminal data acquisition and control module is used for correspondingly investing or cutting off the load in the load unit under the control of the control instruction issued by the micro-grid central control module, so that the power which can be supplied by the micro-power source unit is balanced with the power required by the load unit.
2. The microgrid system of claim 1, wherein the medium voltage energy storage modules comprise at least one power-type energy storage micro power source.
3. The microgrid system of claim 2, wherein the second tiles further comprise:
at least one power type energy storage micro-source controller, at least one power type energy storage micro-source controller one-to-one with at least one power type energy storage micro-source that the middling pressure energy storage module includes links to each other, power type energy storage micro-source controller is used for receiving the control command that little electric wire netting central control module was issued, and the little electric wire netting of control corresponding power type energy storage carries out off-grid/the little electric wire netting mode switch of being incorporated into the power networks to little electric wire netting central control module feedback corresponding power type energy storage micro-source's operating condition.
4. The microgrid system of claim 3, wherein the second tiles further comprise:
the system comprises at least one controllable power type energy storage micro power source switch, at least one controllable power type energy storage micro power source switch and a plurality of power type energy storage micro power source controllers, wherein the controllable power type energy storage micro power source switch is connected with each power type energy storage micro power source and the corresponding power type energy storage micro power source controller one to one;
a transformer;
the low-voltage bus is used for connecting the low-voltage end of the transformer with each controllable power type energy storage micro power switch;
and the medium-voltage bus is used for connecting the high-voltage end of the transformer with an external power grid.
5. The microgrid system of claim 4, wherein the end data acquisition and control module comprises:
the system comprises a micro-power source unit, at least one micro-power source controller and a micro-grid central control module, wherein the at least one micro-power source controller is connected with at least one micro-power source included in the micro-power source unit in a one-to-one correspondence manner, and is used for controlling the corresponding micro-power source to switch an off-grid/grid-connected working mode, controlling the working power of the corresponding micro-power source and feeding back the working state of the corresponding micro-power source to the micro-grid central control module;
the first load controllers are connected with at least one load included in the load units in a one-to-one correspondence manner, and are used for controlling the input or the cut-off of the corresponding load and receiving an instruction issued by the microgrid central control module;
the micro-power controllers and the first load controllers are connected with the second load controller, and the second load controller is used for receiving an instruction sent by the micro-grid central control module;
and the data acquisition monitoring unit is connected with the second load controller, the data acquisition monitoring unit is also connected with each micro-power controller and each first load controller, and the data acquisition monitoring unit is used for: real-time electrical parameters of each micro power supply are collected in real time through each micro power supply controller, and the running state of each micro power supply is monitored; real-time electrical parameters of each load are collected in real time through each first load controller, and the running state of each load is monitored; and transmitting the electrical parameters of each micro power supply, the electrical parameters of each load, the running state data of each micro power supply and the running state data of each load to the micro-grid central control module.
6. The microgrid system of claim 5, wherein the microgrid energy supply module further comprises:
the controllable micro power switches are connected with the micro power supplies and the corresponding micro power controllers thereof in a one-to-one correspondence manner;
the controllable load switches are connected with the loads and the corresponding load controllers thereof in a one-to-one correspondence manner;
a transformer;
the low-voltage bus is used for connecting the low-voltage end of the transformer with each controllable micro power switch and each controllable load switch;
the controllable voltage switch is arranged on the low-voltage bus and connected with the second load controller;
the medium-voltage bus is used for connecting the high-voltage end of the transformer with an external power grid;
and the grid-connected/off-grid control switch is arranged on the medium-voltage bus.
7. The microgrid system of claim 6, further comprising:
the third load controllers are arranged outside the first blocks and the second blocks, connected with the grid-connected/off-grid control switch and used for receiving instructions sent by the microgrid central control module;
the total data acquisition monitoring units are arranged outside the first blocks and the second blocks, the total data acquisition monitoring units are connected with the third load controller, and the total data acquisition monitoring units are used for: acquiring electrical parameters of each micro power supply, electrical parameters of each load, running state data of each micro power supply and running state data of each load in each first block from the data acquisition monitoring unit of each first block, and monitoring the running state of each first block; and transmitting the electrical parameters of each micro power supply, the electrical parameters of each load, the running state data of each micro power supply, the running state data of each load and the running state data of each first block to the micro-grid central control module.
8. The microgrid system of claim 7, wherein the first and second blocks further comprise network management units, the network management units of the first block are connected with the data acquisition and monitoring unit, the second load controller, the respective microgrid controllers and the respective first load controllers of the block via a client communication bus, and the network management units of the second block are connected with the power type energy storage microgrid controllers of the block via a client communication bus;
the microgrid system further comprises:
a total network management unit arranged outside each first block and each second block, wherein the total network management unit is connected with the total data acquisition monitoring unit and the third load controller through the user side communication bus;
and the system end communication converters are arranged outside the first blocks and the second blocks, the system end communication converters, the main network management unit and the network management units are connected in series through network communication buses, and the system end communication converters are also connected with the micro-grid central control module through the network communication buses.
9. The microgrid system of claim 8, wherein the network management unit comprises:
each user side communication converter of the network management unit, the system side communication converter and the main network management unit are connected in series through a network communication bus;
and the communication management machine is connected with the user side communication converter through a user side communication bus.
10. The microgrid system of claim 1, wherein the microgrid central control module comprises:
the medium-voltage energy storage prediction unit is used for predicting the maximum discharge power of the medium-voltage energy storage module in real time;
the micro power source prediction unit is used for predicting the power which can be supplied by the micro power source unit in real time;
the load prediction unit is used for predicting the power required by the load unit in real time;
the database is connected with the medium-voltage energy storage prediction unit, the micro power source prediction unit and the load prediction unit and is used for providing data required by real-time prediction for the medium-voltage energy storage prediction unit, the micro power source prediction unit and the load prediction unit, and the database stores the energy supply balance hysteresis margin data of the micro grid system in advance;
the microgrid central controller is connected with the medium-voltage energy storage prediction unit, the microgrid prediction unit, the load prediction unit and the database, and is used for: acquiring real-time predicted prediction data from the medium-voltage energy storage prediction unit, issuing a corresponding control instruction according to the real-time predicted prediction data, and controlling the medium-voltage energy storage module to supply power to all loads in the microgrid system; acquiring real-time predicted prediction data from the micro power source prediction unit and the load prediction unit, acquiring the power supply and energy balance hysteresis margin data from the database, continuously adjusting an island range according to the real-time predicted prediction data and the power supply and energy balance hysteresis margin of the micro grid system, then determining loads needing to be input and loads needing to be cut in the load units according to the adjusted island range and the importance of each load in the load units, and issuing corresponding control instructions.
11. The microgrid system of claim 10, wherein the micro power supply units comprise at least one of photovoltaic power generation micro power supplies, wind power generation micro power supplies, generator micro power supplies and energy storage micro power supplies.
12. The microgrid system of claim 11, wherein the micro power supply units comprise at least one of photovoltaic power generation micro power supplies and wind power generation micro power supplies;
the micro-power source prediction unit comprises at least one of a photovoltaic power generation prediction subunit and a wind power generation prediction subunit, and the type of the prediction subunit included in the micro-power source prediction unit is the same as the type of the micro-power source included in the micro-power source unit;
the micro-grid central control module further comprises a weather forecast unit connected with the database, and the weather forecast unit is used for acquiring weather data and transmitting the acquired weather data to the database as a type of data required for real-time prediction.
13. A microgrid system control method applied to the microgrid system according to any one of claims 1 to 12, characterized in that the microgrid control method comprises:
step S1: predicting the maximum discharge power of the medium-voltage energy storage module, the power which can be supplied by each micro power supply in the micro power supply unit and the power required by each load in the load unit in real time;
step S2: calculating the total power required by all loads of the micro-grid system in real time;
step S3: judging whether the micro-grid system and an external power grid need to be disconnected in real time, if so, judging whether the predicted maximum discharge power of the medium-voltage energy storage module at the current time point is greater than or equal to the calculated total power required by all loads in the micro-grid system, if so, entering a step S4, and if not, entering a step S7;
step S4: calculating the maximum power supply time of the medium-voltage energy storage module to all loads of the micro-grid system;
step S5: disconnecting the connection between the micro-grid system and an external power grid, supplying power to all loads in the micro-grid system through the medium-voltage energy storage module within the maximum power supply time, and determining a first island range according to the power which can be supplied by each micro-power supply in the micro-power supply unit and the power required by each load in the load unit predicted in real time to enable the micro-grid system to enter an island operation mode;
step S6: judging whether the power which can be supplied by the micro power source unit and the power required by all the loads covered in the current island range are balanced in real time, if not, readjusting the island range to enable the power which can be supplied by the micro power source unit and the power required by all the loads covered in the adjusted island range to be balanced again;
step S7: and keeping the micro-grid system and the external power grid connected continuously, wherein the micro-grid system does not work.
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| CN111103484B (en) * | 2019-12-19 | 2021-11-30 | 国网湖南省电力有限公司 | Island detection method, device and system based on hybrid power feedback disturbance |
| CN114221377B (en) * | 2021-11-16 | 2023-08-22 | 云南电网有限责任公司迪庆供电局 | Off-grid multi-energy-storage response control method and system |
| CN114221376B (en) * | 2021-11-16 | 2023-07-14 | 云南电网有限责任公司迪庆供电局 | Regional parallel-to-off-network response control method and system |
| CN116435982B (en) * | 2021-12-30 | 2024-05-10 | 北京天诚同创电气有限公司 | Microgrid control method and device |
| CN118300185B (en) * | 2024-06-06 | 2024-10-22 | 江苏方程电力科技有限公司 | Intelligent micro-grid control method |
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| CN102355057A (en) * | 2011-09-25 | 2012-02-15 | 国网电力科学研究院 | Computer monitoring method for microgrid system |
| CN102842904A (en) * | 2012-07-30 | 2012-12-26 | 东南大学 | Micro-grid collaborative frequency control method based on power shortage prediction and distribution |
| CN104281977A (en) * | 2013-07-10 | 2015-01-14 | 北京中电建投微电网科技有限公司 | Hybrid microgrid application platform and control method theref |
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| CN102355057A (en) * | 2011-09-25 | 2012-02-15 | 国网电力科学研究院 | Computer monitoring method for microgrid system |
| CN102842904A (en) * | 2012-07-30 | 2012-12-26 | 东南大学 | Micro-grid collaborative frequency control method based on power shortage prediction and distribution |
| CN104281977A (en) * | 2013-07-10 | 2015-01-14 | 北京中电建投微电网科技有限公司 | Hybrid microgrid application platform and control method theref |
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