CN110752595A - Power distribution station fault support method and device based on flexible decision strategy - Google Patents
Power distribution station fault support method and device based on flexible decision strategy Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention discloses a power distribution area fault support method and device based on a flexible decision strategy, which are suitable for a flexible power distribution area interconnection system based on a flexible area controller, and the method comprises the following steps: according to the state of a superior breaker, the voltage of an alternating current bus, superior alternating current and the fault state of an AC/DC converter, the near-end fault of a non-alternating current bus is identified, fault support is started, active instructions of the AC/DC converters of all non-fault stations are distributed and issued, and finally the running mode of a fault power distribution area is judged according to the fault state of the fault power distribution area. When the power loss of the incoming line side of the transformer area is judged, the non-fault AC/DC converter stabilizes the bus power supply voltage and provides power requirements for the alternating current load from the direct current interconnection system, continuous power supply of the load is realized, and the power consumption experience and the power supply quality of a user are improved.
Description
Technical Field
The invention belongs to the technical field of power distribution and utilization, and particularly relates to a power distribution area fault support method and device based on a flexible judgment strategy.
Background
The distribution area or distribution area generally refers to an alternating current distribution mode, a closed-loop design and a ring-divided operation mode are generally adopted, and parallel operation of multiple distribution areas cannot be realized. When an alternating current incoming line of a certain transformer area fails and an alternating current bus is subjected to voltage loss, the rapid power supply recovery of an alternating current load in the failed transformer area cannot be effectively responded.
In the prior art, a fault line is usually removed by a manual maintenance mode, and the alternating current bus of a fault station area is restored to be powered by a bus tie switch.
The prior art has the following problems: 1. the fault line can be cut off only by a manual maintenance mode, and the AC bus of the fault station area is restored to be powered by the bus tie switch, so that the automation degree is low; 2. the quick and effective fault support cannot be carried out, certain power failure time exists, and the time for recovering the power supply is long; 3. the load power supply reliability is poor, and the power consumption experience of a user is weak.
Disclosure of Invention
The invention provides a station fault support method and device based on a flexible station area, which solve the problem that a non-near-end fault occurs on the incoming line power supply side of the conventional distribution station area to cause the loss of power of an alternating current bus, carry out fault support on the fault station area by using a flexible station area interconnection system, recover the power supply of a voltage-loss bus and improve the power supply reliability of an alternating current load
The technical scheme adopted by the invention is as follows:
a power distribution area fault support method based on a flexible decision strategy is suitable for a flexible power distribution area interconnection system based on a flexible area controller, and comprises the following steps:
carrying out fault identification on the distribution substation area, and entering a fault support working mode when the fault identification is that the near-end fault of the non-alternating-current bus exists;
restarting the fault power distribution area in a fault support working mode, and converting a control mode of the fault power distribution area from a constant power control mode into a voltage-frequency control mode;
after the fault power distribution station area stably operates in the voltage-frequency control mode, an active power instruction is issued through the AC/DC converter of each non-fault power distribution station area, and fault support is carried out on the fault power distribution station area.
Furthermore, each flexible power distribution station in the flexible power distribution station interconnection system is provided with an AC/DC converter; the alternating current incoming lines of the AC/DC converters are connected with the low-voltage side of the distribution transformer of the distribution area, the direct current outgoing lines of the AC/DC converters of all the distribution areas are interconnected in a star, ring or series mode, and direct current loads are connected to the direct current side of the distribution area in parallel directly or through the DC/DC converters;
the flexible station controller is used for collecting real-time electrical parameters and operation states of all direct-current interconnected power distribution stations, managing operation modes of the power distribution stations and an interconnection system, and controlling the AC/DC converter of each power distribution station according to the operation modes.
Further, the power distribution station area fault identification is carried out, and the method comprises the following steps:
when the upper-level circuit breaker is in a closed state, the alternating current bus is in a voltage loss state, the upper-level alternating current outgoing line has no current, and the fault word of the AC/DC converter is satisfied by under-voltage protection, the upper-level circuit breaker is identified as a non-alternating current bus near-end fault.
Further, restarting the failed power distribution station comprises:
and tripping off the local-side breaker switch of the fault power distribution station to complete the restart of the fault power distribution station.
Furthermore, after the control mode of the fault distribution substation is converted from the constant power control mode to the voltage-frequency control mode, positive and negative sequence control is added to current inner loop control.
Further, each non-fault distribution substation AC/DC converter issues an active power instruction, including:
and distributing the active commands of the non-fault station AC/DC converters according to the total available capacity of the non-fault distribution station AC/DC converters and the alternating current load rate of each distribution station.
Further, after the fault support is put into operation, if no new fault is added and no overload is generated, the current fault support operation mode is maintained;
and if the same type of faults occur in the newly added distribution areas or any type of faults occur in the newly added distribution areas or the flexible distribution area interconnection system is overloaded, fault support is not carried out.
Further, after the grid side power supply of the fault power distribution area is recovered, the control mode of the power distribution area is switched, and the voltage-frequency control mode is switched to a constant power control mode or a droop control mode.
Furthermore, when the AC/DC converter of the fault distribution station is locked, the current-stage AC circuit breaker and the DC networking circuit breaker are disconnected, and the distribution station is isolated.
A power distribution substation fault support apparatus based on a flexible decision strategy, comprising:
the fault identification module is used for identifying faults of the distribution substation area, and when the faults are identified to be faults at the near end of the non-alternating-current bus, the fault identification module enters a fault support working mode;
the mode conversion module is used for restarting the fault power distribution area in the fault support working mode and converting the control mode of the fault power distribution area from a constant power control mode to a voltage-frequency control mode;
and the instruction issuing module is used for issuing an active power instruction through the AC/DC converter of each non-fault power distribution area after the fault power distribution area stably operates in the voltage-frequency control mode, and performing fault support on the fault power distribution area.
Further, the fault identification module is specifically configured to,
and when the upper-level circuit breaker is in a closed state, the alternating-current bus is in a voltage loss state, the upper-level alternating-current outgoing line has no current, and the fault word of the AC/DC converter is met by under-voltage protection, the power distribution area is identified as a non-alternating-current bus near-end fault.
Further, the mode conversion module is specifically configured to,
and tripping off the local-side breaker switch of the fault power distribution station to complete the restart of the fault power distribution station.
Further, the mode conversion module is further configured to convert the fault distribution substation control mode from the constant power control mode to the voltage-frequency control mode, and then add positive and negative sequence control to the current inner loop control.
Further, the instruction issuing module is specifically configured to,
and distributing the active power command of each non-fault station AC/DC converter according to the total available capacity of the non-fault distribution station AC/DC converters and the alternating current load rate of each distribution station.
The invention achieves the following beneficial technical effects:
the invention aims at fault support of the transformer area alternating current power supply loop during maintenance or fault, and stabilizes the bus power supply voltage and provides power requirements for the alternating current load from the direct current interconnection system through the non-fault AC/DC converter when the power loss of the transformer area inlet line side is judged. On the one hand, continuous power supply of load is realized, uninterrupted power supply can be realized, namely, after a network side fault is detected or the network side fault is overhauled, the converter is controlled to provide alternating-current side voltage, and the power consumption experience and the power supply quality of a user are improved. On the other hand, when fault support is performed, positive and negative sequence control is added to current inner loop control, so that power overshoot or oscillation occurring in a station area during control switching is reduced, and stable power supply is realized.
Drawings
FIG. 1 is a diagram of a typical flexible power distribution bay interconnect system architecture;
fig. 2 is a diagram of non-near-end fault criteria of the transformer area alternating current incoming line.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention provides a power distribution area fault support method based on a flexible decision strategy, which is applicable to a flexible power distribution area interconnection system based on a flexible area controller. As shown in fig. 1, a single typical flexible power distribution block, the primary system of which includes a 10kV/0.4kV transformer, a circuit breaker, a voltage transformer, a current transformer, an AC/DC converter, and an AC load. The alternating current incoming lines of the AC/DC converters are connected with the low-voltage side of the distribution transformer of the flexible transformer area, the direct current outgoing lines of the AC/DC converters of all the transformer areas are interconnected in a star-shaped, annular or series-shaped structure, and the like, and direct current loads are connected to the direct current side of the transformer areas directly or in parallel through the DC/DC converters.
The flexible station controller manages all direct-current interconnected power distribution areas, collects real-time electrical parameters and operation states of all the stations on one hand, manages the stations and the operation modes of the direct-current interconnected system on the other hand, and controls the AC/DC converters of all the stations according to the operation modes.
When the AC/DC converter of a certain transformer area is locked and withdrawn due to the fact that an AC side power supply is lost in the transformer area, the flexible transformer area controller is used for rapidly judging the fault type, the actual fault working condition is judged based on the criterion in the invention, the fault type is judged to be a non-AC bus near-end fault, and the fault type can be used for carrying out fault support by using the flexible transformer area system. The fault support method comprises the following steps: and tripping an alternating current near-side switch of the fault transformer area, rapidly restarting an AC/DC converter of the fault transformer area, and recovering power supply to the voltage-loss alternating current bus by utilizing an optimized voltage-frequency control mode of the AC/DC converter to realize transformer area fault support.
Meanwhile, the station areas which have entered the fault support mode are comprehensively judged, and if the problems of faults or faults and the like occur newly, a corresponding processing mechanism is entered.
A power distribution substation fault support method based on a flexible decision strategy includes the following specific steps in this embodiment:
step one, fault identification:
referring to fig. 2, when the system operating state SysMode =1, the upper AC switch is in the closed state, the upper AC bus is in the no-voltage state, the upper incoming line side has no current, the feeder line has no current, and the AC/DC converter fault word is that the condition of undervoltage protection is satisfied, the fault recognition criterion recognizes that the fault is a non-AC bus near-end fault, sets the fault support control bit faultpurflag to 1, and starts fault support at this time.
Taking fig. 1 as an example, assuming that a total of 4 transformer areas are interconnected by a direct current networking manner, the capacity of each transformer area is 800kVA, the capacity of the AC/DC converter is 200kW, when the system is in normal operation, SysMode =1, and when the switch state of the circuit breaker Br1 is detected to be in a closed state, the far-end incoming current I is detected1Near end feeder current I2And if the AC/DC converter fault words are all 0, when the under-voltage protection conditions are all met, after the anti-shake delay of T time, the fault is identified as a non-alternating-current bus near-end fault, and the fault support control bit FaultSupFlag is set to 1, namely, the fault support is started at the moment.
And entering a fault support working mode and then entering a step two.
Step two, calculating an active instruction of the AC/DC converter in the non-fault power distribution station area:
according to the total available capacity of the AC/DC converters of the non-fault distribution substations, the active instructions of the AC/DC converters of the non-fault distribution substations are distributed according to the AC load rate of each distribution substation, and the fault support is determined for the single or multiple distribution substations with faults, so that the system can recover the power supply of the AC load of the fault voltage-loss distribution substations. The total available capacity of the AC/DC converter of the non-fault distribution area is the tending capacity obtained by subtracting the output power of the distribution transformer of the distribution area from the rated capacity of the distribution transformer of the distribution area.
In the above embodiment, when a single area fault is detected, the AC load to be supported is 80kW, and the total DC load is 100kW, the total transfer load is 180kW, and the total transfer load needs to be distributed to the remaining fault-free areas, because the AC load rates of the areas are equal to each other and are 0.3, the active power command of the AC/DC converter of the non-fault station is 60kW, and the active power command is verified to be smaller than the rated capacity of the converter, and the transformer overload of the area where the converter is located is not caused. Therefore, it is determined that the single station supports the fault, and the system can recover the power supply to the ac load of the fault voltage-loss station.
Step three, restarting the AC/DC converter of the voltage loss station:
firstly, tripping off a local-side breaker switch Br2 of a fault area, restarting the failed distribution area with voltage loss, converting a control mode from constant power control into voltage-frequency control, and realizing effective control of power impact during on/off-grid control of an AC/DC converter through phase locking and control of an alternating current bus phase, namely flexible fault support; meanwhile, in the control process, positive and negative sequence control is added to current inner loop control, and stable power supply of the AC/DC converter under three-phase imbalance of the load can be realized.
Step four, the AC/DC converter of the non-fault station issues an active power:
and when the voltage-loss station is restarted successfully within the set time of the system and operates normally according to the voltage-frequency control mode, issuing an active power instruction of each non-fault station AC/DC converter according to the power instruction calculated in the step two.
Step five, judging after the fault support is put into operation:
after entering a fault support working mode, if fault support is put into operation, no newly-added fault and no overload exist, and a current fault support operation mode is maintained; if the newly added transformer area has the same type of fault or the newly added multiple transformer areas have any type of fault or the system is overloaded, the power is not transferred or supported; when the power supply at the network side of the original voltage loss station is recovered, the control mode of the station is switched, and the voltage-frequency control is switched into constant power control or droop control; when the AC/DC converter of the transformer area is locked due to the failure of restarting of the original voltage loss station and the like, the current-stage alternating current circuit breaker and the direct current networking circuit breaker are disconnected, and the transformer area is isolated.
In another aspect, the present invention further provides a power distribution substation fault support apparatus based on a flexible decision policy, including:
the fault identification module is used for identifying faults of the distribution substation area, and when the faults are identified to be faults at the near end of the non-alternating-current bus, the fault identification module enters a fault support working mode;
the mode conversion module is used for restarting the fault power distribution area in the fault support working mode and converting the control mode of the fault power distribution area from a constant power control mode to a voltage-frequency control mode;
and the instruction issuing module is used for issuing an active power instruction through the AC/DC converter of each non-fault power distribution area after the fault power distribution area stably operates in the voltage-frequency control mode, and performing fault support on the fault power distribution area.
The fault identification module is specifically configured to: when the upper-level circuit breaker is in a closed state, the alternating current bus is in a voltage loss state, the upper-level alternating current outgoing line has no current, and the fault word of the AC/DC converter is satisfied by under-voltage protection, the upper-level circuit breaker is identified as a non-alternating current bus near-end fault.
The mode conversion module is specifically used for tripping off a local-side breaker switch of the fault power distribution station to complete restarting of the fault power distribution station.
The mode conversion module is further used for converting the fault distribution area control mode from a constant power control mode to a voltage-frequency control mode and then adding positive and negative sequence control to current inner loop control.
The instruction issuing module is specifically configured to,
and distributing the active power command of each non-fault station AC/DC converter according to the total available capacity of the non-fault distribution station AC/DC converters and the alternating current load rate of each distribution station.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (14)
1. A power distribution area fault support method based on a flexible decision strategy is suitable for a flexible power distribution area interconnection system based on a flexible area controller, and is characterized by comprising the following steps:
carrying out fault identification on the distribution substation area, and entering a fault support working mode when the fault identification is that the near-end fault of the non-alternating-current bus exists;
restarting the fault power distribution area in a fault support working mode, and converting a control mode of the fault power distribution area from a constant power control mode into a voltage-frequency control mode;
after the fault power distribution station area stably operates in the voltage-frequency control mode, an active power instruction is issued through the AC/DC converter of each non-fault power distribution station area, and fault support is carried out on the fault power distribution station area.
2. The distribution substation fault support method based on the flexible decision strategy according to claim 1, wherein each flexible distribution substation in the flexible distribution substation interconnection system is provided with an AC/DC converter; the alternating current incoming lines of the AC/DC converters are connected with the low-voltage side of the distribution transformer of the distribution area, the direct current outgoing lines of the AC/DC converters of all the distribution areas are interconnected in a star, ring or series mode, and direct current loads are connected to the direct current side of the distribution area in parallel directly or through the DC/DC converters;
the flexible station controller is used for collecting real-time electrical parameters and operation states of all direct-current interconnected power distribution stations, managing operation modes of the power distribution stations and an interconnection system, and controlling the AC/DC converter of each power distribution station according to the operation modes.
3. The power distribution substation fault support method based on the flexible decision strategy according to claim 1, wherein the power distribution substation fault identification comprises:
when the upper-level circuit breaker is in a closed state, the alternating current bus is in a voltage loss state, the upper-level alternating current outgoing line has no current, and the fault word of the AC/DC converter is satisfied by under-voltage protection, the upper-level circuit breaker is identified as a non-alternating current bus near-end fault.
4. The power distribution substation fault support method based on the flexible decision strategy according to claim 1, wherein restarting the faulty power distribution substation comprises:
and tripping off the local-side breaker switch of the fault power distribution station to complete the restart of the fault power distribution station.
5. The distribution substation fault support method based on the flexible decision strategy as claimed in claim 1, wherein the positive and negative sequence control is added to the current inner loop control after the control mode of the fault distribution substation is converted from the constant power control mode to the voltage-frequency control mode.
6. The distribution substation fault support method based on the flexible decision strategy according to claim 1, wherein each non-faulty distribution substation AC/DC converter issues an active power command, comprising:
and distributing the active commands of the non-fault station AC/DC converters according to the total available capacity of the non-fault distribution station AC/DC converters and the alternating current load rate of each distribution station.
7. The distribution substation fault support method based on the flexible decision strategy as claimed in claim 1, wherein after the fault support is put into operation, if no new fault is added and no overload is generated, the current fault support operation mode is maintained;
and if the same type of faults occur in the newly added distribution areas or any type of faults occur in the newly added distribution areas or the flexible distribution area interconnection system is overloaded, fault support is not carried out.
8. The distribution substation fault support method based on the flexible decision strategy as claimed in claim 1, wherein after the grid side power supply of the faulty distribution substation is recovered, the control mode of the distribution substation is switched, and the voltage-frequency control mode is switched to a constant power control mode or a droop control mode.
9. The distribution substation fault support method based on the flexible decision strategy as claimed in claim 1, wherein when the AC/DC converter of the faulty distribution substation is locked, the current stage AC breaker and the DC networking breaker are opened to isolate the distribution substation.
10. A power distribution substation fault support apparatus based on a flexible decision strategy, comprising:
the fault identification module is used for identifying faults of the distribution substation area, and when the faults are identified to be faults at the near end of the non-alternating-current bus, the fault identification module enters a fault support working mode;
the mode conversion module is used for restarting the fault power distribution area in the fault support working mode and converting the control mode of the fault power distribution area from a constant power control mode to a voltage-frequency control mode;
and the instruction issuing module is used for issuing an active power instruction through the AC/DC converter of each non-fault power distribution area after the fault power distribution area stably operates in the voltage-frequency control mode, and performing fault support on the fault power distribution area.
11. The distribution substation fault support apparatus based on the flexible decision making strategy according to claim 10, wherein the fault identification module is specifically configured to,
and when the upper-level circuit breaker is in a closed state, the alternating-current bus is in a voltage loss state, the upper-level alternating-current outgoing line has no current, and the fault word of the AC/DC converter is met by under-voltage protection, the power distribution area is identified as a non-alternating-current bus near-end fault.
12. The flexible decision making strategy based distribution substation fault support apparatus of claim 10, wherein said mode conversion module is specifically configured to,
and tripping off the local-side breaker switch of the fault power distribution station to complete the restart of the fault power distribution station.
13. The distribution substation fault support apparatus based on the flexible decision strategy of claim 10, wherein the mode conversion module is further configured to add positive-negative sequence control to the current inner loop control after converting the faulty distribution substation control mode from the constant power control mode to the voltage-frequency control mode.
14. The distribution substation fault support apparatus based on flexible decision making strategy according to claim 10, wherein the instruction issuing module is specifically configured to,
and distributing the active power command of each non-fault station AC/DC converter according to the total available capacity of the non-fault distribution station AC/DC converters and the alternating current load rate of each distribution station.
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| CN115800412A (en) * | 2022-12-07 | 2023-03-14 | 中国电力科学研究院有限公司 | Transformer area alternating current-direct current flexible interaction device, system and method |
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