CN113381503B - Control method for improving power supply reliability of distribution network area by adopting mobile power supply - Google Patents
Control method for improving power supply reliability of distribution network area by adopting mobile power supply Download PDFInfo
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- CN113381503B CN113381503B CN202110651010.1A CN202110651010A CN113381503B CN 113381503 B CN113381503 B CN 113381503B CN 202110651010 A CN202110651010 A CN 202110651010A CN 113381503 B CN113381503 B CN 113381503B
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- Engineering & Computer Science (AREA)
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a control method for improving the power supply reliability of a distribution network area by adopting a mobile power supply, wherein a breaker S1 is arranged between an outgoing line of a distribution network transformer substation and a high-voltage feeder, the high-voltage feeder is connected with one end of a transformer of the distribution network area through a high-voltage side breaker QF1, the other end of the transformer of the distribution network area is connected with a low-voltage bus through a synchronous switch TQ1, and the low-voltage bus is connected with the mobile power supply through a low-voltage side breaker QF2 and a synchronous switch TQ2 in sequence; the synchronous switch TQ1 is in communication connection with the synchronous switch TQ2. Under different situations, when the mobile power supply is connected with or disconnected from a power grid, seamless switching between the power grid and the mobile power supply is realized through mutual cooperation of the high-voltage side breaker QF1, the low-voltage side breaker QF2, the synchronous switch TQ1 and the synchronous switch TQ2. On the premise of fully considering various operation scenes of a distribution network area, the problem that power failure needs to be performed for a short time when a mobile power supply is connected with a power grid or disconnected from the power grid is solved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a control method for improving power supply reliability of a distribution network area by adopting a mobile power supply.
Background
The rapid development of the modern society cannot be supported by electric power, and once a serious power failure accident occurs, especially when multiple points simultaneously fail, a plurality of production departments are paralyzed due to power failure, so that the normal operation of the society is influenced. Therefore, when a major power failure accident occurs, an effective emergency power first-aid repair strategy is established, the power failure loss is saved to the maximum extent, the power failure time and range are reduced as far as possible, and the method has important significance.
The mobile power supply has characteristics of mobility, safety and the like, plays an increasingly significant role in fault first-aid repair, and has started to enter a wide application stage. However, at present, a mobile power supply needs to be powered off once before power supply access and after power supply protection is finished, a terminal load needs to be powered off and restarted, power supply quality is affected, normal production work can be interrupted, and equipment or products are scrapped particularly when some production work is powered off. Therefore, the above problems need to be carefully analyzed to solve the problem of short-time power failure during the operation and withdrawal of the portable power source.
Disclosure of Invention
The invention provides a control method for improving the power supply reliability of a distribution network area by adopting a mobile power supply, which aims to: on the premise of fully considering various operation scenes of a distribution network area, seamless switching between power supply of a power grid and power supply of a mobile power supply is realized by using a quick circuit breaker and an intelligent grid-connected control technology.
The technical scheme of the invention is as follows:
a control method for improving the power supply reliability of a distribution network area by adopting a mobile power supply is characterized in that a breaker S1 is arranged between a distribution network substation outgoing line and a high-voltage feeder, the high-voltage feeder is connected with one end of an area transformer through a high-voltage side breaker QF1, the other end of the area transformer is connected with a low-voltage bus through a synchronous switch TQ1, and the low-voltage bus is connected with the mobile power supply through a low-voltage side breaker QF2 and a synchronous switch TQ2 in sequence; the synchronous switch TQ1 is in communication connection with the synchronous switch TQ2;
the control method comprises the following steps: under different scenes, when the mobile power supply is connected with or disconnected from a power grid, the high-voltage side circuit breaker QF1, the low-voltage side circuit breaker QF2, the synchronous switch TQ1 and the synchronous switch TQ2 are matched with each other, and seamless switching between the power grid and the mobile power supply is realized.
As a further improvement of the method, scenario one: the control method for the grid connection of the mobile power supply during the normal operation of the power grid comprises the following steps:
s1-1: closing the low-voltage side breaker QF2, and detecting a low-voltage bus side voltage signal by the synchronous switch TQ2;
s1-2: starting the mobile power supply to stably operate;
s1-3: and the synchronous switch TQ2 is switched on by utilizing the synchronous grid connection capability of the synchronous switch TQ2.
As a further improvement of the method, scenario two: when the mobile power supply and the power grid run synchronously and local faults of power grid equipment are subjected to power failure maintenance, the control method for splitting the transformer area and the power grid comprises the following steps:
s2-1: disconnecting the synchronous switch TQ1;
s2-2: the mobile power supply keeps an operation state, automatically adjusts output power according to load requirements and is used for guaranteeing that the load of the transformer area is not powered off;
s2-3: and disconnecting the high-voltage side breaker QF1 for preparing for power grid power restoration.
As a further improvement of the method, scenario three: when the power supply is recovered after the power grid is overhauled, the seamless grid-connected control method of the mobile power supply and the power grid comprises the following steps:
s3-1: the high-voltage side breaker QF1 is closed, the synchronous switch TQ1 detects transformer side voltage information of a transformer area, and the synchronous switch TQ1 communicates with the synchronous switch TQ2 to send the voltage information to the mobile power supply;
s3-2: the mobile power supply is adjusted to be in a grid-connected mode, voltage and a power angle are adjusted according to voltage information of a transformer side of a transformer area, a closing command is sent to a synchronous switch TQ1, and the synchronous switch TQ1 is automatically closed after the synchronous is detected;
s3-3: and turning off the synchronous switch TQ2, and stopping the operation of the mobile power supply.
As a further improvement of the method, scenario four: when a power grid fails to cause power loss of a transformer area caused by disconnection of a breaker S1, the control method for maintaining power supply of the transformer areas comprises the following steps:
s4-1: after the power grid loses power, except for the transformer area where the mobile power supply is located, the high-voltage side circuit breakers QF1 in the transformer area at the rear section of the circuit breaker S1 are all disconnected;
s4-2: the mobile power supply is automatically switched on;
s4-3: and preferentially closing the high-voltage side circuit breaker QF1 corresponding to the station area with the important small load according to whether the important load exists in the station area and the size of the important load.
As a further improvement of the method, in the step S4-3, if the high-voltage side circuit breaker QF1 of a certain area is turned on to cause unstable system voltage, the high-voltage side circuit breaker QF1 which is just turned on is immediately turned off.
As a further improvement of the method, scenario five: in the fourth scenario, if there is more than one area containing the mobile power supply, when the power grid loses power and the mobile power supply is automatically switched in, communication is established among the mobile power supplies to perform cooperative start control: and (4) appointing a certain mobile power supply to start first, establishing system voltage, putting the rest mobile power supplies in sequence, and executing steps S4-1-S4-3 after all the mobile power supplies are put in.
As a further improvement of the method, when the mobile power supply is connected with the power grid, the mobile power supply is controlled, and when the voltage difference, the frequency difference and the phase difference between the mobile power supply and the power grid are all within respective set ranges, the corresponding circuit breakers are controlled to be closed, so that the synchronous connection of the mobile power supply and the power grid is realized.
As a further improvement of the method, when the mobile power supply and the power grid are synchronously connected, the voltage difference between the mobile power supply and the power grid does not exceed 10% of the voltage of the power grid, the frequency difference does not exceed 0.4Hz, and the phase difference does not exceed 10 degrees.
As a further improvement of the method, when the power grid normally runs, the breaker S1, the high-voltage side breaker QF1 and the synchronous switch TQ1 are all in the on-position state, the low-voltage side breaker QF2 and the synchronous switch TQ2 are all in the off-position state, and the mobile power supply is not started.
Compared with the prior art, the invention has the following beneficial effects:
(1) Through the mutual cooperation of the circuit breaker and the synchronous switch, the problem that short-time power failure is needed when the mobile power supply and the power grid are connected and disconnected is solved, seamless switching between the power grid and the mobile power supply is realized, the power failure risk in a major power supply protection event is reduced, the power failure of a user is realized under the condition of equipment maintenance when local faults of power grid equipment occur, and the power utilization satisfaction degree of the user is improved;
(2) Aiming at the condition of insufficient regional power supply capacity, regional load peak is realized by accessing a plurality of regional mobile power supplies without power outage, and the uninterrupted power supply requirements of industry and commerce are ensured;
(3) When the mobile power supply is connected with the power grid, the voltage and the phase angle of the mobile power supply are controlled, so that the synchronous connection of the mobile power supply and the power grid is realized, the impact caused during switching-on is reduced, and the stability is improved.
Drawings
FIG. 1 is an electrical schematic of the present invention;
fig. 2 is a schematic diagram of five scenario classifications according to the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings:
as shown in fig. 1, a control method for improving the reliability of power supply of a distribution network transformer area by using a mobile power supply includes that a breaker S1 is arranged between an outgoing line of a distribution network transformer substation and a high-voltage feeder, the high-voltage feeder is connected with one end of a transformer of the distribution network transformer area through a high-voltage side breaker QF1, and the other end of the transformer of the distribution network transformer area is connected with a low-voltage bus through a synchronous switch TQ1; the low-voltage bus is connected with the mobile power supply through the low-voltage side breaker QF2 and the synchronous switch TQ2 in sequence, and the synchronous switch TQ1 is in communication connection with the synchronous switch TQ2. And other power consumers are connected below the low-voltage bus.
The control method comprises the following steps: when the mobile power supply is connected with or disconnected from a power grid, seamless switching between the power grid and the mobile power supply is realized through cooperation between the high-voltage side breaker QF1, the low-voltage side breaker QF2, the synchronous switch TQ1 and the synchronous switch TQ2. Specifically, as shown in fig. 2, the present embodiment sets control strategies under multiple scenarios for the situation that the power grid may occur, so as to sufficiently ensure uninterrupted power supply of the user.
When the power grid normally operates, the breaker S1, the high-voltage side breaker QF1 and the synchronizing switch TQ1 are all in an on-position state, the low-voltage side breaker QF2 and the synchronizing switch TQ2 are all in an off-position state, and the mobile power supply is not started.
Scenario 1: when the power grid normally operates, the control method for grid connection of the mobile power supply comprises the following steps:
s1-1: closing the low-voltage side breaker QF2, and detecting a low-voltage bus side voltage signal by the synchronous switch TQ2;
s1-2: starting the mobile power supply to stably operate;
s1-3: and the synchronous switch TQ2 is switched on by utilizing the synchronous grid connection capability of the synchronous switch TQ2.
Scenario 2: when the mobile power supply and a power grid run synchronously and local faults of power grid equipment are in power failure maintenance, the control method for disconnecting the transformer area and the power grid comprises the following steps:
s2-1: disconnecting the synchronous switch TQ1;
s2-2: the mobile power supply keeps an operation state, and because the power supply of a power grid is lacked, the mobile power supply automatically adjusts the output power according to the load requirement so as to ensure that the load of the transformer area does not stop;
s2-3: and disconnecting the high-voltage side breaker QF1 for preparing for power grid power restoration.
Scenario 3: when the power supply is recovered after the power grid is overhauled, the seamless grid-connected control method of the mobile power supply and the power grid comprises the following steps:
s3-1: the method comprises the following steps that a high-voltage side breaker QF1 is closed, a transformer of a transformer area is electrified, a synchronous switch TQ1 detects voltage information of the transformer side of the transformer area, and the synchronous switch TQ1 sends the voltage information to a mobile power supply through communication with a synchronous switch TQ2;
s3-2: the mobile power supply is adjusted to be in a grid-connected mode, voltage and phase angle are adjusted according to voltage information of a transformer side of a transformer area, a closing command is sent to a synchronous switch TQ1, and the synchronous switch TQ1 is automatically closed after the synchronous detection;
s3-3: and turning off the synchronous switch TQ2, and stopping the operation of the mobile power supply.
Therefore, the load power supply of the transformer area is smoothly converted from the emergency power supply of the mobile power supply to the normal power supply of the power grid, and the power supply is uninterrupted in the conversion process.
Scenario 4: when a power grid fails to cause power loss of a transformer area caused by disconnection of a breaker S1, the control method for maintaining power supply of the transformer areas comprises the following steps:
s4-1: after the power grid loses power, except for the transformer area where the mobile power supply is located, the high-voltage side circuit breakers QF1 in the transformer area at the rear section of the circuit breaker S1 are all disconnected;
s4-2: the mobile power supply is automatically switched on;
s4-3: and preferentially closing the high-voltage side circuit breaker QF1 corresponding to the station area with the important small load according to whether the important load exists in the station area and the size of the important load.
If the high-voltage side breaker QF1 of a certain platform area is closed to cause unstable phenomena such as system voltage drop, the high-voltage side breaker QF1 which is just closed is immediately disconnected, and the operation is finished. Under this operating mode, portable power source can guarantee as much as possible that important load supplies power.
Scenario 5: on the basis of the scene 4, if more than one district containing the mobile power supply, when the power grid loses power and the mobile power supply is automatically switched in, communication is established among the mobile power supplies, and the cooperative start control is carried out: and appointing a certain mobile power supply to start first, establishing system voltage, and putting the rest mobile power supplies into use in sequence. And executing the steps S4-1 to S4-3 after all the mobile power supplies are put into operation.
In all scenarios, synchronization is one of the key technologies. The ideal condition of synchronous grid connection is that the frequency, the voltage amplitude and the phase angle of the voltages on two sides of the breaker are all equal, at the moment, the impact current of grid connection and closing is equal to zero, the mobile power supply and the power grid immediately enter synchronous operation after grid connection, and no disturbance phenomenon is generated. In actual operation, ideal conditions are difficult to meet simultaneously, at the moment of grid-connected switching-on, a side with high voltage transmits certain reactive power to a side with low voltage, and a side with high frequency transmits certain active power to a side with low frequency. The mobile power supply can bear the impact of short circuit and automatic line superposition, so that in synchronous grid connection, the requirements on frequency difference and voltage difference are not strict, but phase angle difference grid connection is required within a specified range, and the phase sequence is required to be the same. Therefore, the conditions for synchronization are:
(1) Both parties should have consistent phase sequence;
(2) The frequency of the power supply to be combined is close to the system frequency, and the frequency difference is not more than 0.4Hz generally;
(3) The voltages of the power supply to be combined and the mobile power supply to be combined and the system are approximately equal, and the voltage difference is kept within 10 percent generally;
(4) At the time of grid-connected switching-on, the phase angle difference between the mobile power supply to be connected and the system tends to zero, and usually, the phase angle difference is not suitable to exceed 10 degrees.
In the embodiment, the voltage difference and the frequency difference between the mobile power supply and the power grid are limited within a certain range by controlling the voltage and the frequency of the mobile power supply; in the periodic change of the phase difference, the change rate of the phase difference is dynamically measured, and the sending time of the closing pulse is captured according to the time required by closing the grid-connected switch, so that the circuit breaker is controlled to close near the zero crossing point of the phase difference, and the synchronous grid connection of the mobile power supply and the power grid is realized.
Claims (5)
1. A control method for improving the reliability of power supply of a distribution network area by adopting a mobile power supply is characterized in that a circuit breaker S1 is arranged between an outgoing line of a distribution network substation and a high-voltage feeder, the high-voltage feeder is connected with one end of an area transformer through a high-voltage side circuit breaker QF1, and the control method comprises the following steps: the other end of the transformer area is connected with a low-voltage bus through a synchronous switch TQ1, and the low-voltage bus is connected with a mobile power supply through a low-voltage side breaker QF2 and the synchronous switch TQ2 in sequence; the synchronous switch TQ1 is in communication connection with the synchronous switch TQ2;
the control method comprises the following steps: under different situations, when the mobile power supply is connected with or disconnected from a power grid, the high-voltage side circuit breaker QF1, the low-voltage side circuit breaker QF2, the synchronous switch TQ1 and the synchronous switch TQ2 are matched with each other, so that seamless switching between the power grid and the mobile power supply is realized;
scenario one: the control method for the grid connection of the mobile power supply during the normal operation of the power grid comprises the following steps:
s1-1: closing the low-voltage side breaker QF2, and detecting a low-voltage bus side voltage signal by the synchronous switch TQ2;
s1-2: starting the mobile power supply to stably operate;
s1-3: the synchronous switch TQ2 is switched on by utilizing the synchronous grid connection capability of the synchronous switch TQ2;
scenario two: when the mobile power supply and the power grid run synchronously and local faults of power grid equipment are subjected to power failure maintenance, the control method for splitting the transformer area and the power grid comprises the following steps:
s2-1: disconnecting the synchronous switch TQ1;
s2-2: the mobile power supply keeps the running state, automatically adjusts the output power according to the load requirement and is used for ensuring the power failure of the load of the distribution room;
s2-3: disconnecting the high-voltage side breaker QF1 for preparing for power grid power restoration;
scenario three: when the power supply is recovered after the power grid is overhauled, the seamless grid-connected control method of the mobile power supply and the power grid comprises the following steps:
s3-1: the high-voltage side breaker QF1 is closed, the synchronous switch TQ1 detects transformer side voltage information of a transformer area, and the synchronous switch TQ1 communicates with the synchronous switch TQ2 to send the voltage information to the mobile power supply;
s3-2: the mobile power supply is adjusted to be in a grid-connected mode, voltage and a power angle are adjusted according to voltage information of a transformer side of a transformer area, a closing command is sent to a synchronous switch TQ1, and the synchronous switch TQ1 is automatically closed after the synchronous is detected;
s3-3: and turning off the synchronous switch TQ2, and stopping the operation of the mobile power supply.
2. The control method for improving the reliability of power supply of the distribution network area by adopting the mobile power supply as claimed in claim 1, wherein: scene four: when a power grid fails to cause power loss of a transformer area caused by disconnection of a breaker S1, the control method for maintaining power supply of the transformer areas comprises the following steps:
s4-1: after the power grid loses power, the high-voltage side circuit breakers QF1 in the rear section area of the circuit breaker S1 are all disconnected except the area where the mobile power supply is located;
s4-2: the mobile power supply is automatically switched on;
s4-3: according to whether important loads exist in the transformer area and the size of the important loads, the high-voltage side circuit breaker QF1 corresponding to the transformer area with the important small loads is closed preferentially;
in the step S4-3, if the high-voltage side circuit breaker QF1 of a certain platform area is turned on to cause unstable system voltage, immediately turning off the high-voltage side circuit breaker QF1 which is just turned on;
scene five: in the fourth scenario, if there is more than one area containing the mobile power supply, when the power grid loses power and the mobile power supply is automatically switched in, communication is established among the mobile power supplies to perform cooperative start control: and (4) appointing a certain mobile power supply to start first, establishing system voltage, putting the rest mobile power supplies in sequence, and executing steps S4-1-S4-3 after all the mobile power supplies are put in.
3. The control method for improving the reliability of power supply of the distribution network area by adopting the mobile power supply as claimed in any one of claims 1 to 2, characterized in that: when the mobile power supply is connected with the power grid in a grid mode, the mobile power supply is controlled, and when the voltage difference, the frequency difference and the phase difference between the mobile power supply and the power grid are within respective set ranges, the corresponding circuit breakers are controlled to be closed, so that synchronous grid connection of the mobile power supply and the power grid is achieved.
4. The control method for improving the reliability of power supply of the distribution network area by adopting the mobile power supply as claimed in claim 3, wherein: when the mobile power supply and the power grid are synchronously connected, the voltage difference between the mobile power supply and the power grid does not exceed 10% of the voltage of the power grid, the frequency difference does not exceed 0.4Hz, and the phase difference does not exceed 10 degrees.
5. The control method for improving the reliability of power supply of the distribution network area by adopting the mobile power supply as claimed in any one of claims 1 to 2, characterized in that: when the power grid normally operates, the breaker S1, the high-voltage side breaker QF1 and the synchronizing switch TQ1 are all in an on-position state, the low-voltage side breaker QF2 and the synchronizing switch TQ2 are all in an off-position state, and the mobile power supply is not started.
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