CN117955140B - Power distribution method, device, energy storage power station and storage medium - Google Patents
Power distribution method, device, energy storage power station and storage medium Download PDFInfo
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- CN117955140B CN117955140B CN202410190336.2A CN202410190336A CN117955140B CN 117955140 B CN117955140 B CN 117955140B CN 202410190336 A CN202410190336 A CN 202410190336A CN 117955140 B CN117955140 B CN 117955140B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 238000005457 optimization Methods 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000007726 management method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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Classifications
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/381—Dispersed generators
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to a power distribution method, a device, an energy storage system and a storage medium, wherein the method comprises the steps of obtaining the total power of the energy storage system and the current required power of a plurality of grid-connected systems; the method comprises the steps of obtaining the issuing power of each corresponding grid-connected system according to the total power and each current required power, detecting the operation parameter data of each grid-connected system, processing each issuing power according to each operation parameter data to obtain each optimized issuing power, and charging and discharging the corresponding grid-connected system based on each optimized issuing power to realize the power distribution balance and the battery use balance of each grid-connected system, thereby avoiding the overcharge or overdischarge of the battery in the energy storage system, ensuring the stable operation of the energy storage power station and reducing the cost.
Description
Technical Field
The present application relates to the field of energy storage technologies, and in particular, to a power distribution method, a device, an energy storage power station, and a storage medium.
Background
An Energy Management System (EMS) is a decision-making central device of an electrochemical energy storage plant in which the EMS may be responsible for distributing power to all grid-connected systems of the plant.
In the power distribution mode of the existing energy storage power station, the conditions of unbalanced power distribution and unbalanced charge and discharge among batteries exist, for example, the power is directly and evenly distributed to each grid-connected system for charge and discharge, the problem that the batteries are overcharged or overdischarged is easily caused, the operation stability of the energy storage system is reduced, and the operation cost is increased.
Disclosure of Invention
Based on this, it is necessary to provide a power distribution method, a device, an energy storage power station and a storage medium capable of balancing power distribution and balancing battery usage, avoiding battery overcharge or overdischarge, ensuring stable operation of the energy storage power station, and reducing cost, aiming at the technical problems existing in the power distribution mode of the existing energy storage power station.
In a first aspect, the present application provides a power allocation method, comprising the steps of:
acquiring the total power of an energy storage system and the current required power of a plurality of grid-connected systems;
obtaining the issuing power of each corresponding grid-connected system according to the total power and each current demand power;
detecting operation parameter data of each grid-connected system, and processing each downlink power according to each operation parameter data to obtain each optimized downlink power;
and based on the optimized issued power, charging and discharging the corresponding grid-connected system.
In one embodiment, the step of obtaining the issued power of each corresponding grid-connected system according to the total power and each current required power includes:
Obtaining total required power according to each current required power;
Obtaining the power demand proportion of each grid-connected system according to each current demand power and the total demand power;
the step of obtaining the issued power of each corresponding grid-connected system according to the total power and each current required power comprises the following steps:
and obtaining the issuing power of each corresponding grid-connected system according to the total power and the power demand proportion.
In one embodiment, the operating parameter data comprises temperature data;
processing each downlink power according to each operation parameter data, and obtaining each optimized downlink power comprises the following steps:
When the temperature data does not fall into the temperature threshold range, updating the issued power of the corresponding temperature data which does not fall into the temperature threshold range to 0;
when the temperature data falls into the temperature threshold range, the transmitting power of the corresponding temperature data falling into the temperature threshold range is maintained unchanged.
In one embodiment, the operating parameter data further comprises voltage data;
processing each downlink power according to each operation parameter data, and obtaining each optimized downlink power comprises the following steps:
when the voltage data does not fall into the voltage threshold range, updating the issued power of the corresponding voltage data which does not fall into the voltage threshold range to 0;
When the voltage data falls into the voltage threshold range, the issuing power of the corresponding voltage data falling into the voltage threshold range is maintained unchanged.
In one embodiment, the operating parameter data further includes SOC data;
processing each downlink power according to each operation parameter data, and obtaining each optimized downlink power comprises the following steps:
when the SOC data does not fall into the SOC threshold range, updating the issued power of the corresponding SOC data which does not fall into the SOC threshold range to 0;
when the SOC data falls into the SOC threshold range, the issuing power of the corresponding SOC data falling into the SOC threshold range is maintained unchanged.
In one embodiment, the step of processing each downlink power according to each operation parameter data to obtain each optimized downlink power includes:
updating the issued power of the corresponding grid-connected system to the first power threshold of the corresponding grid-connected system when the issued power of the corresponding grid-connected system exceeds the first power threshold of the corresponding grid-connected system;
And when the issued power of the corresponding grid-connected system does not exceed the first power threshold of the corresponding grid-connected system, maintaining the issued power of the corresponding grid-connected system unchanged.
In one embodiment, the operating parameter data further includes current actual power, and the step of detecting the operating parameter data of each grid-connected system includes:
and when the current actual power exceeds the second power threshold, updating the downlink power corresponding to the current actual power exceeding the second power threshold to 0.
In a second aspect, the present application provides a power distribution apparatus comprising:
the power acquisition unit is used for acquiring the total power of the energy storage system and the current required power of the grid-connected systems;
The power distribution unit is used for obtaining the issuing power of each corresponding grid-connected system according to the total power and each current required power;
the power optimizing unit is used for detecting the operation parameter data of each grid-connected system, and processing each issuing power according to each operation parameter data to obtain each optimized issuing power;
and the power issuing unit is used for issuing power based on each optimized power and carrying out charge and discharge on the corresponding grid-connected system.
In a third aspect, the present application provides an energy storage power station, including an energy storage system and each grid-connected system, where the energy storage system is provided with an energy management system, the energy management system is respectively connected to each grid-connected system, and the energy management system is configured to execute the steps of the power distribution method according to any one of the above.
In a fourth aspect, the present application provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor performs the steps of any of the above power allocation methods.
One of the above technical solutions has the following advantages and beneficial effects:
The power distribution method comprises the steps of obtaining total power of an energy storage system and current demand power of a plurality of grid-connected systems, obtaining issuing power of each corresponding grid-connected system according to the total power and the current demand power, detecting operation parameter data of each grid-connected system, processing each issuing power according to the operation parameter data to obtain each optimized issuing power, and charging and discharging the corresponding grid-connected system based on each optimized issuing power to achieve balanced power distribution of each grid-connected system. According to the application, the distribution power is distributed according to the current required power of each grid-connected system, after the distribution of the distribution power of each grid-connected system is completed, the distribution power is adjusted by detecting the operation parameter data of each grid-connected system, and the optimization of the distribution power is realized, so that the corresponding grid-connected system is charged and discharged based on the optimized distribution power, the power distribution balance and the battery use balance are realized, the overcharge or overdischarge of the battery in the energy storage system is avoided, the stable operation of the energy storage power station is ensured, and the cost is reduced.
Drawings
Fig. 1 is a schematic diagram of an application scenario of a power allocation method in an embodiment of the present application;
FIG. 2 is a first flow chart illustrating a power distribution method according to an embodiment of the application;
FIG. 3 is a flow chart illustrating a temperature data processing step in an embodiment of the present application;
FIG. 4 is a flowchart illustrating steps of voltage data processing according to an embodiment of the present application;
FIG. 5 is a flowchart illustrating steps of SOC data processing according to an embodiment of the present application;
FIG. 6 is a flowchart illustrating a step of power down processing according to an embodiment of the present application;
FIG. 7 is a block diagram of a power distribution apparatus according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an energy storage power station according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The power distribution method provided by the application can be applied to an application environment shown in figure 1. The processing device may include a processor 102 and a memory 104, where the memory 104 may be configured to store data such as total power, current demand power, operating parameter data, and optimized delivered power. The processor 102 may be configured to obtain a total power of the energy storage system and current demand power of the plurality of grid-connected systems, obtain a delivery power of each corresponding grid-connected system according to the total power and each current demand power, detect operation parameter data of each grid-connected system, process each delivery power according to each operation parameter data to obtain each optimized delivery power, and charge and discharge the corresponding grid-connected system based on each optimized delivery power. The processing device may also include a display 106, and the display 106 may display data for total power, current demand power, operating parameter data, and optimized delivered power, etc., via a graphical interface.
The processing device may be an energy management system, where the processing device may be disposed in an energy storage system, where the energy storage system and each grid-connected system form an energy storage station, and the energy management system is respectively connected to each grid-connected system. In another example, the energy storage power station further includes an energy storage converter (PCS), a first side of the energy storage converter is connected to the energy storage system, and a second side of the energy storage converter is connected to each grid-connected system.
In one embodiment, as shown in fig. 2, a power allocation method is provided, and the method is applied to the processor 102 in fig. 1 for illustration, and includes the following steps:
step S210, the total power of the energy storage system and the current required power of a plurality of grid-connected systems are obtained.
The total power of the energy storage system may be total charging power or total discharging power, and correspondingly, the current required power of the grid-connected system may be the current required charging power or the current required discharging power.
The method comprises the steps of receiving a power distribution request, inquiring the total power of an energy storage system according to the power distribution request when the power distribution request is received, and further obtaining the total power of the energy storage system, transmitting a power demand command to each grid-connected system according to the power distribution request, and further feeding back corresponding current demand power by each grid-connected system according to the demand command, thereby obtaining the current demand power of each grid-connected system.
Step S220, obtaining the issuing power of each corresponding grid-connected system according to the total power and each current required power.
The power delivered may be a charging power delivered or an electric power delivered.
And processing the total power and each current demand power according to the obtained total power and each current demand power, so as to obtain the issuing power of each corresponding grid-connected system.
Step S230, detecting the operation parameter data of each grid-connected system, and processing each downlink power according to each operation parameter data to obtain each optimized downlink power.
Wherein the operating parameters may be, but are not limited to, electrical parameters and environmental characteristic parameters.
For example, a plurality of sensing modules can be set, the operation parameters of the corresponding grid-connected systems are detected in real time through the sensing modules, the detected operation parameter data are transmitted to the processor, and the processor obtains the operation parameter data of each corresponding grid-connected system.
The processor can perform optimization processing on each downlink power according to the acquired operation parameter data, for example, a critical value can be set for the corresponding operation parameter, the comparison processing is performed on each operation parameter data and the corresponding critical value, and according to the comparison processing result, each downlink power is optimized and adjusted, so that the optimized downlink power corresponding to each grid-connected system is obtained.
And step S240, based on the optimized issued power, charging and discharging the corresponding grid-connected system.
For example, each optimized issued power is transmitted to an energy storage converter, and each grid-connected system is charged and discharged through the energy storage converter, so that the grid-connected system charges and discharges according to the corresponding optimized issued power.
In the embodiment, the total power of the energy storage system and the current demand power of the grid-connected systems are obtained, the issuing power of each corresponding grid-connected system is obtained according to the total power and the current demand power, the operation parameters of each grid-connected system are detected to obtain the operation parameter data of each corresponding grid-connected system, each issuing power is processed according to each operation parameter data to obtain each optimized issuing power, and the grid-connected systems corresponding to each optimized issuing power are charged and discharged based on each optimized issuing power to realize the power balance distribution of each grid-connected system. According to the application, the distribution power is distributed according to the current required power of each grid-connected system, after the distribution of the distribution power of each grid-connected system is completed, the distribution power is adjusted by detecting the operation parameter data of each grid-connected system, and the optimization of the distribution power is realized, so that the corresponding grid-connected system is charged and discharged based on the optimized distribution power, the power distribution balance and the battery use balance are realized, the overcharge or overdischarge of the battery in the energy storage system is avoided, the stable operation of the energy storage power station is ensured, and the cost is reduced.
In one example, the step of obtaining the issued power of each corresponding grid-connected system according to the total power and each current required power includes:
and obtaining the power demand proportion of each grid-connected system according to each current demand power and the total demand power.
For example, the grid-connected systems may include a Battery Management System (BMS), which transmits a power demand command to the BMS of each grid-connected system, and then the BMS of each grid-connected system feeds back the corresponding current demand power according to the demand command, so as to obtain the current demand power of each grid-connected system, and the current demand power is accumulated to obtain the total demand power, and the current demand power is divided by the total demand power, so as to obtain the power demand proportion of the corresponding grid-connected system. It should be noted that the current required power may be the maximum required power that the corresponding grid-connected system can currently charge or discharge.
In one example, the step of obtaining the issued power of each corresponding grid-connected system according to the total power and each current required power includes:
and obtaining the issuing power of each corresponding grid-connected system according to the total power and the power demand proportion.
And multiplying the power demand proportion of each grid-connected system by the total power respectively to obtain the issued power of each corresponding grid-connected system. Further, after distributing the issued power of each grid-connected system, detecting the operation parameter data of each grid-connected system to adjust the issued power, and optimizing the issued power, so that the corresponding grid-connected system is charged and discharged based on the optimized issued power, power distribution balance and battery use balance are realized, battery overcharge or overdischarge in the energy storage system is avoided, stable operation of the energy storage power station is ensured, and cost is reduced.
In one embodiment, the operation parameter data includes temperature data, and as shown in fig. 3, the step of processing each downlink power according to each operation parameter data to obtain each optimized downlink power includes:
In step S310, when the temperature data does not fall within the temperature threshold range, the downlink power corresponding to the temperature data not falling within the temperature threshold range is updated to 0.
For example, the temperature sensor can be used for detecting the temperature of the corresponding grid-connected system, so as to obtain the temperature data of the corresponding grid-connected system.
And comparing the temperature data of each grid-connected system with the temperature threshold range, and judging that the corresponding grid-connected system is in an overtemperature or undertemperature state when the temperature data does not fall into the temperature threshold range, so that the issued power of the corresponding temperature data which does not fall into the temperature threshold range is updated to be 0, namely, the issued power of the grid-connected system of which the temperature data does not fall into the temperature threshold range is not issued, thereby improving the safety and reliability of power distribution.
In step S320, when the temperature data falls within the temperature threshold range, the power delivered by the corresponding temperature data falling within the temperature threshold range is maintained unchanged.
The temperature data of each grid-connected system is compared with the temperature threshold range, when the temperature data falls into the temperature threshold range, the temperature of the corresponding grid-connected system is judged to be in a safe state, and then the delivery power of the corresponding temperature data falling into the temperature threshold range is maintained unchanged, so that the optimization of the delivery power of each grid-connected system is realized, the corresponding grid-connected system is charged and discharged based on the optimized delivery power, the power distribution balance and the battery use balance are realized, the overcharge or overdischarge of the battery in the energy storage system is avoided, the stable operation of the energy storage power station is ensured, and the cost is reduced.
In the embodiment, the power of each grid-connected system is flexibly distributed, so that the energy management system has higher intelligent level, and meanwhile, on the premise of not influencing the hardware performance of the energy management system, the energy storage system is ensured to stably operate by improving the computing capacity of the energy management system, and the operation cost is reduced.
In one embodiment, the operation parameter data further includes voltage data, and as shown in fig. 4, the step of processing each downlink power according to each operation parameter data to obtain each optimized downlink power includes:
in step S410, when the voltage data does not fall within the voltage threshold range, the transmission power corresponding to the voltage data not falling within the voltage threshold range is updated to 0.
For example, the voltage sensor can be used to detect the voltage of the corresponding grid-connected system, so as to obtain the voltage data of the corresponding grid-connected system.
By comparing the voltage data of each grid-connected system with the voltage threshold range, when the voltage data does not fall into the voltage threshold range, the corresponding grid-connected system is judged to be in an overvoltage or undervoltage state, and then the issued power of the corresponding voltage data which does not fall into the voltage threshold range is updated to be 0, namely, the power is not issued to the grid-connected system of which the voltage data does not fall into the voltage threshold range, so that the safety and the reliability of power distribution are further improved.
In step S420, when the voltage data falls within the voltage threshold range, the power delivered by the voltage data falling within the voltage threshold range is maintained unchanged.
The voltage data of each grid-connected system is compared with the voltage threshold range, when the voltage data falls into the voltage threshold range, the voltage of the corresponding grid-connected system is judged to be in a safe state, and then the delivery power of the corresponding voltage data falling into the voltage threshold range is maintained unchanged, so that the optimization of the delivery power of each grid-connected system is realized, the corresponding grid-connected system is charged and discharged based on the optimized delivery power, the power distribution balance and the battery use balance are realized, the overcharge or overdischarge of the battery in the energy storage system is avoided, the stable operation of the energy storage power station is ensured, and the cost is reduced.
In one embodiment, the operation parameter data further includes SOC (State Of Charge) data, and as shown in fig. 5, the step of processing each downlink power according to each operation parameter data to obtain each optimized downlink power includes:
In step S510, when the SOC data does not fall within the SOC threshold range, the transmission power corresponding to the SOC data not falling within the SOC threshold range is updated to 0.
For example, the SOC of the corresponding grid-connected system may be detected by the BMS, and thus SOC data of the corresponding grid-connected system may be obtained.
And comparing the SOC data of each grid-connected system with an SOC threshold range (for example, setting to 5% -95%), and judging that the corresponding grid-connected system is in a battery unstable state when the SOC data does not fall into the SOC threshold range, so that the issuing power of the corresponding SOC data which does not fall into the SOC threshold range is updated to 0, namely, the issuing power is not issued to the grid-connected system of which the SOC data does not fall into the SOC threshold range, thereby further improving the safety and reliability of power distribution.
In step S520, when the SOC data falls within the SOC threshold range, the power delivered by the SOC data falling within the SOC threshold range is maintained unchanged.
And comparing the SOC data of each grid-connected system with the SOC threshold range, and judging that the SOC of the corresponding grid-connected system is in a stable state when the SOC data falls into the SOC threshold range, so that the issuing power of the corresponding SOC data falling into the SOC threshold range is maintained unchanged, the issuing power of each grid-connected system is optimized, the corresponding grid-connected system is charged and discharged based on the optimized issuing power, the power distribution balance and the battery use balance are realized, the overcharge or overdischarge of the battery in the energy storage system is avoided, the stable operation of the energy storage power station is ensured, and the cost is reduced.
In one embodiment, as shown in fig. 6, the step of processing each downlink power according to each operation parameter data to obtain each optimized downlink power includes:
step S610, when the issued power of the corresponding grid-connected system exceeds the first power threshold of the corresponding grid-connected system, updating the issued power of the corresponding grid-connected system to the first power threshold of the corresponding grid-connected system.
Comparing the issued power of each grid-connected system with a corresponding first power threshold, and when the issued power exceeds the first power threshold, judging that the charging power and/or discharging power of the corresponding grid-connected system is overlarge, and updating the issued power of the corresponding grid-connected system to the corresponding first power threshold to realize the optimized adjustment of the issued power of the corresponding grid-connected system.
And step S620, when the issued power of the corresponding grid-connected system does not exceed the first power threshold of the corresponding grid-connected system, maintaining the issued power of the corresponding grid-connected system unchanged.
And comparing the issued power of each grid-connected system with a first power threshold, and judging that the charging power and/or the discharging power of the corresponding grid-connected system are in a proper range when the issued power does not exceed the first power threshold, so that the issued power of the corresponding grid-connected system is maintained unchanged, the issued power of each grid-connected system is optimized, the corresponding grid-connected system is charged and discharged based on the optimized issued power, the power distribution balance and the battery use balance are realized, the overcharge or overdischarge of the battery in the energy storage system is avoided, the stable operation of the energy storage power station is ensured, and the cost is reduced.
In the above embodiment, the distribution of the power to be delivered is performed according to the required power of the BMS of each grid-connected system, after the distribution of the power to be delivered of each grid-connected system is completed, the distribution of the power to be delivered is not immediately transmitted to the PCS, but the running parameter state of each grid-connected system is detected to optimize and adjust the power, the optimized power to be delivered is transmitted to the PCS, the PCS is used for charging and discharging the corresponding grid-connected system, so as to realize the power distribution balance and the battery use balance, and it is required to explain that the execution time of completing the power optimization distribution is stabilized within 200ms, so as to realize the extreme response, and the EMS can better manage and schedule the distributed energy sources (such as photovoltaic, energy storage and charging piles) by performing the flexible power distribution on each grid-connected system, so as to realize the optimal utilization of the energy sources and the reduction of the energy cost.
In one embodiment, the operating parameter data further includes current actual power, and the step of detecting the operating parameter data of each grid-connected system includes:
and when the current actual power exceeds the second power threshold, updating the downlink power corresponding to the current actual power exceeding the second power threshold to 0.
For example, the power of the corresponding grid-connected system can be detected in real time through the BMS, so that the current actual power of the corresponding grid-connected system can be obtained.
Comparing the current actual power of each grid-connected system with a second power threshold, and judging that the current actual power of the corresponding grid-connected system exceeds a safety range when the current actual power exceeds the second power threshold, and updating the issued power corresponding to the current actual power exceeding the second power threshold to be 0, namely not issuing power to the grid-connected system of which the current actual power exceeds the second power threshold, so that the safety and reliability of power distribution are further improved.
It should be understood that, although the steps in the flowcharts of fig. 2 to 6 are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 2-6 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily occur in sequence, but may be performed alternately or alternately with at least a portion of the other steps or sub-steps of other steps.
In one embodiment, as shown in fig. 7, there is provided a power distribution apparatus comprising:
the power obtaining unit 710 is configured to obtain the total power of the energy storage system and the current required power of the grid-connected systems.
The power distribution unit 720 is configured to obtain the issued power of each corresponding grid-connected system according to the total power and each current required power.
And the power optimizing unit 730 is configured to detect operation parameter data of each grid-connected system, and process each downlink power according to each operation parameter data to obtain each optimized downlink power.
And the power issuing unit 740 is configured to charge and discharge the corresponding grid-connected system based on the respective optimized issued powers.
For specific limitations of the power distribution apparatus, reference may be made to the above limitation of the power distribution method, and no further description is given here. The various modules in the power distribution apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the energy management system, or may be stored in software in a memory in the energy management system, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, as shown in fig. 8, there is further provided an energy storage power station, including an energy storage system 810 and a plurality of grid-connected systems 820, where the energy storage system 810 is provided with an energy management system 812, and the energy management system 812 is respectively connected to each grid-connected system 820, and the energy management system is configured to perform the steps of the power distribution method as described above.
For example, the energy storage power station further includes an energy storage current transformer connected between the energy storage system 810 and each grid-connected system 820, the energy storage system 810 may discharge to each grid-connected system 820 through the energy storage current transformer, and each grid-connected system 820 may also charge the energy storage system 810 through the energy storage current transformer. Grid-tie systems 820 may include Battery Management Systems (BMS), with energy management system 812 being connected to the BMS of each grid-tie system 820 separately.
The energy management system 812 obtains the issuing power of each corresponding grid-connected system 820 by obtaining the total power of the energy storage system 810 and the current demand power of each grid-connected system 820, according to the total power and the current demand power, detects the operation parameters of each grid-connected system 820 to obtain the operation parameter data of each corresponding grid-connected system 820, processes each issuing power according to each operation parameter data to obtain each optimized issuing power, and charges and discharges each grid-connected system 820 corresponding to the optimized issuing power based on each optimized issuing power to realize the power balance distribution of each grid-connected system 820. The application distributes the delivery power according to the current required power of each grid-connected system 820, detects the operation parameter data of each grid-connected system 820 to adjust the delivery power after distributing the delivery power of each grid-connected system 820, and realizes the optimization of the delivery power, thereby realizing the charge and discharge of the corresponding grid-connected system 820 based on the optimized delivery power, realizing the balance of power distribution and battery use, avoiding the overcharge or overdischarge of the battery in the energy storage system 810, ensuring the stable operation of the energy storage power station, and reducing the cost.
In the above embodiment, the flexible power distribution is performed on each grid-connected system 820, so that the charge and discharge states of the energy storage system 810 can be accurately adjusted according to real-time detection data and prediction information to achieve optimal power distribution, thereby solving the problem of unbalanced power distribution of the traditional energy management system 812, avoiding battery overcharge or overdischarge, solving the problem of unbalanced charge and discharge among battery clusters, enabling battery usage to be more balanced, being more flexible and reasonable in power distribution, being capable of independently controlling charge and discharge of the battery clusters in the single energy storage system 810, being mutually noninterfere, being capable of optimizing energy utilization and distribution by the energy storage system 810 through flexible power distribution, achieving energy storage during low demand and releasing energy during high demand, avoiding energy waste and improving energy utilization efficiency, and being capable of absorbing redundant energy during grid peak load, relieving stored energy when required to meet peak demand, being beneficial to reducing dependence on traditional power generation equipment and reducing operation cost of a grid.
In one embodiment, the present application provides a computer readable storage medium having a computer program stored thereon, which when executed by a processor, implements the steps of any of the power allocation methods described above.
For example, the computer program when executed by a processor implements the steps of the power allocation method as follows:
The method comprises the steps of obtaining total power of an energy storage system and current demand power of each grid-connected system, obtaining issuing power of each corresponding grid-connected system according to the total power and the current demand power, detecting operation parameters of each grid-connected system to obtain operation parameter data of each corresponding grid-connected system, processing each issuing power according to the operation parameter data to obtain each optimized issuing power, and charging and discharging each grid-connected system corresponding to the optimized issuing power based on each optimized issuing power to achieve balanced power distribution of each grid-connected system.
Those skilled in the art will appreciate that implementing all or part of the above-described embodiments of the method may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of embodiments of the division methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (SYNCHLINK) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
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