CN113675838A - Load-balanced quick fault recovery method for specific power system - Google Patents

Load-balanced quick fault recovery method for specific power system Download PDF

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Publication number
CN113675838A
CN113675838A CN202110649672.5A CN202110649672A CN113675838A CN 113675838 A CN113675838 A CN 113675838A CN 202110649672 A CN202110649672 A CN 202110649672A CN 113675838 A CN113675838 A CN 113675838A
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load
fault recovery
power supply
standby power
power system
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Inventor
周之华
周立波
吴育腾
郑海涯
周斌
杨程
金贵红
封杰
王秀境
庞清乐
薛永瑞
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Guizhou Power Grid Co Ltd
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Guizhou Power Grid Co Ltd
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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
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Abstract

The invention discloses a quick fault recovery method for a load-balanced specific power system, which aims at that each standby power supply of the specific power system takes a load rate expected value as an objective, and sequentially carries out power supply recovery on fault recovery loads of the standby power supplies according to the sequence of load rates from low to high until the loads of a fault recovery area are completely recovered or the standby power supplies are fully loaded, so that quick fault recovery of the specific power system is realized, load balance after fault recovery is ensured, and the robustness of the fault recovery power system is improved.

Description

Load-balanced quick fault recovery method for specific power system
Technical Field
The invention relates to the technical field of power systems, in particular to a quick fault recovery method for a specific power system with balanced load.
Background
Along with the continuous improvement of the electrification degree, the effect of electric power as a main energy source in a specific system is larger and larger, the structure of the electric power system is more and more complex, and meanwhile, the fault probability of the specific electric power system is higher and higher due to the reasons of improper operation of personnel, self fault of equipment, severe weather influence, artificial damage and the like. After a specific power system fails, fault location and fault isolation are rapidly realized, fault recovery is rapidly performed on non-fault power-loss loads, and loss is reduced. With the gradual increase of the automation degree, the control switches of a specific power system can realize automatic control, and the switching action times are not the main targets of power system fault recovery. The Intelligent recovery of the faults of a specific Power System is realized by utilizing a Cloud Theory Adaptive Genetic Algorithm (Intelligent Power Automation System), 2012,32(3): 47-53). However, due to the inherent disadvantage of long convergence time of the intelligent method, the failure recovery speed is slow, and load balance after failure recovery is not considered, which seriously affects the normal operation and the capability of failure recovery again of a specific power system. Therefore, it is of great significance to design a rapid fault recovery technique for load balancing specific power systems.
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Disclosure of Invention
In view of the above, an object of the first aspect of the present invention is to provide a method for fast fault recovery of a load-balanced specific power system. The invention aims to overcome the defects that the existing specific power system is low in fault recovery speed and the load balancing problem is not considered, designs a load balancing specific power system rapid fault recovery method, provides powerful support for self-healing of the power system and promotes rapid development of the power system.
In order to achieve the object of the first aspect, the invention adopts the following technical scheme:
according to one aspect of one or more embodiments of the present disclosure, a method for quickly recovering a fault of a specific power system with load balancing is provided, which is applicable to the specific power system, and each backup power source of the specific power system sequentially performs power restoration on fault recovery loads of the backup power sources according to a sequence from low load rate to high load rate with a load rate expected value as a target until all loads in a fault recovery area are restored or the backup power sources are fully loaded, so as to implement quick fault recovery of the specific power system, ensure load balancing after fault recovery, and improve robustness of the fault recovery power system.
According to an aspect of one or more embodiments of the present disclosure, there is provided a load balancing method for quickly recovering a fault of a specific power system, when a capacity of a backup power supply is smaller than a load capacity of a fault recovery area, sequentially recovering power supplies of important loads according to importance levels of the loads, and ensuring that the power supplies of the important loads are recovered preferentially.
In the method for quickly recovering the fault of the load-balanced specific power system, the definition of the standby power supply is as follows: the power supply of the power-losing load and the power supply connected with the power-losing load through the interconnection switch are called as standby power supplies and participate in fault recovery.
In the load balancing quick fault recovery method for the specific power system, the load in the fault recovery area is defined as: all loads connected to two or more backup power sources through two or more switches, respectively, are referred to as fail-over area loads.
In the method for quickly recovering the fault of the load-balanced specific power system, the fault recovery load of the standby power supply is defined as follows: all the fail-over area loads connected to a certain backup power source through one switch are referred to as fail-over loads of the backup power source.
The load balancing specific power system rapid fault recovery method comprises the following steps: (1) recovering the power supply of the important load preferentially; (2) the power supply of the power-losing load is recovered to the maximum extent; (3) load balancing after fault recovery; (4) no out-of-limit components appear after fault recovery. The objective function is defined as follows:
Figure BDA0003110616330000021
Figure BDA0003110616330000022
Figure BDA0003110616330000023
Figure BDA0003110616330000024
in the formula: i isILEquivalent currents of all important loads in a fault recovery area; w is aiAn importance level coefficient for the ith important load; i isILiIs the ith important load current; k is the number of important loads; i isRLAll load currents removed after fault recovery; i isCLiFor the ith load current removed; t is the number of load shedding; b isLIs a load balancing function; mu.si、μjThe load ratios of the ith standby power supply and the jth standby power supply are respectively; u is the number of standby power supplies; i isaLiActual supply current for the ith backup energy source; i ismaxiThe maximum allowable current of the ith backup energy source.
According to the load balancing quick fault recovery method for the specific power system, the expected load rate value of the standby power supply is calculated according to the following formula:
Figure BDA0003110616330000031
in the formula:
Figure BDA0003110616330000032
the expected load rate value of the standby power supply is obtained; mu.siThe load rate of the ith standby power supply before fault recovery is carried out; i ismaxiThe maximum allowable current of the ith standby power supply; i isLjLoad current for jth in the fault recovery zone; n is the load number of the fault recovery area; u is the number of standby power supplies.
According to the load balancing quick fault recovery method for the specific power system, the criterion that the load rate of the standby power supply is close to the expected load rate is as follows:
Figure BDA0003110616330000033
in the formula: i isoiThe actual load current of the standby power supply i before fault recovery; i isLijThe jth load current restored for the standby power supply i; d is the number of fail-over zone loads for which the backup power source i has recovered. When the above formula is satisfied, the load rate of the backup power source i has approached the load rate desired value, and the fault recovery of the backup power source is completed.
The invention provides a load balancing specific power system rapid fault recovery method, which comprises the following steps:
step S1: determining a fault recovery area load, a standby power supply and a fault recovery area load of each standby power supply according to a topological structure and a fault point position of a specific power system;
step S2: calculating the total load capacity of the fault recovery area and the total spare capacity of the spare power supplies, and if the total load capacity of the fault recovery area is smaller than the total spare capacity of all the spare power supplies, jumping to step S5; otherwise, executing the following steps;
step S3: if the total important load capacity of the fault recovery area is smaller than the total standby capacity of the standby power supply, taking the important load of the fault recovery area as the load of the fault recovery area, and turning to the step S5; otherwise, executing the following steps;
step S4: according to the importance degree of the load in the fault recovery area, sequentially recovering each important load, and going to step S8;
step S5: calculating a load rate expected value of the standby power supply;
step S6: according to the sequence of the load rates of the standby power supplies from low to high, taking a load rate expected value as a target, and sequentially carrying out fault recovery on the loads of the corresponding fault recovery areas by each standby power supply;
step S7: if all the backup power supplies do not complete the fault recovery, go to step S6; otherwise, executing the following steps;
step S8: if the load is not recovered, sequentially recovering the power supply of each load according to the importance degree of the load;
step S9: and forming a fault recovery scheme according to the fault recovery path of each standby power supply, determining a switch action set of fault recovery, and sending an opening/closing command to a corresponding switch, thereby realizing the fault recovery of a specific power system.
A second aspect of the present invention is to provide a load-balanced fast failure recovery system for a specific power system, including a computer and a network device, and a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein: when the processor executes the computer program, the processor and the external device realize information exchange and data processing through the network device, so as to realize the method.
The beneficial effects of this disclosure are:
(1) the method is suitable for a specific power system, each standby power supply carries out fault recovery by taking a load rate expected value as a target, multiple searches of an intelligent algorithm are not needed, a fault recovery scheme can be quickly formed, quick fault recovery of the power system is realized, loss is reduced to the minimum, and quick self-healing of the power system is ensured.
(2) The method overcomes the defect that the load balance is not considered in the conventional fault recovery method for the specific power system, so that the specific power system after fault recovery is still in load balance, the probability of power overload fault caused by load fluctuation is reduced, the fault recovery capability of the power system is improved, the safe and stable operation of the power system is ensured, and the robustness of the power system is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the present invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of a load balancing specific power system fast failure recovery algorithm of the present disclosure.
FIG. 2 is a block diagram of a particular power system in an embodiment of the present disclosure.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Fig. 1 is a flowchart of a load balancing specific power system fast fault recovery algorithm according to the present disclosure, where the load balancing fault recovery algorithm includes the following steps:
step S1: determining a fault recovery area load, a standby power supply and a fault recovery area load of each standby power supply according to a topological structure and a fault point position of a specific power system;
step S2: calculating the total load capacity of the fault recovery area and the total spare capacity of the spare power supplies, and if the total load capacity of the fault recovery area is smaller than the total spare capacity of all the spare power supplies, jumping to step S5; otherwise, executing the following steps;
step S3: if the total important load capacity of the fault recovery area is smaller than the total standby capacity of the standby power supply, taking the important load of the fault recovery area as the load of the fault recovery area, and turning to the step S5; otherwise, executing the following steps;
step S4: according to the importance degree of the load in the fault recovery area, sequentially recovering each important load, and going to step S8;
step S5: calculating a load rate expected value of the standby power supply;
step S6: according to the sequence of the load rates of the standby power supplies from low to high, taking a load rate expected value as a target, and sequentially carrying out fault recovery on the loads of the corresponding fault recovery areas by each standby power supply;
step S7: if all the backup power supplies do not complete the fault recovery, go to step S6; otherwise, executing the following steps;
step S8: if the load is not recovered, sequentially recovering the power supply of each load according to the importance degree of the load;
step S9: and forming a fault recovery scheme according to the fault recovery path of each standby power supply, determining a switch action set of fault recovery, and sending an opening/closing command to a corresponding switch, thereby realizing the fault recovery of a specific power system.
Fig. 2 is a block diagram of a specific power system (a ship power system is taken as an example) in the embodiment. The power system is divided into 4 power supply areas, each power supply area comprises a power supply, and parameters of each power supply and load in the power system are shown in table 1. The load is distributed to 4 power supplies in a balanced manner, and the load rate of each power supply is 0.909.
Suppose that leg B is10、B63Failure, then L3、L12And L13For load at power failure, load L3From a standby power supply G4Resume power supply, load L13From a standby power supply G2Resume power supply, load L12Power is lost because no backup power is restored. Due to faulty branch B10、B63Are respectively a power supply G1And G3The power supply branch and the power failure load are respectively connected with a power supply G through a communication switch2And G4Connected, so the set of backup power sources is { G }1，G2，G3，G4}. The load current before the fault recovery, the load rate, and the corresponding fault recovery zone load of each backup power source are shown in table 2.
TABLE 1 Ship electric power system power and load parameters
Figure BDA0003110616330000051
TABLE 2 Standby Power before Fault recovery and load parameters of Fault recovery zone
Figure BDA0003110616330000061
Calculating the expected value of the load factor of the standby power supply as
Figure BDA0003110616330000062
The standby power supply can recover all loads in the fault recovery area without considering the loadThe importance of the load. From the standby power G with the lowest load factor3Starting to carry out fault recovery, and when meeting the criterion of approaching the expected value of the load factor, using the standby electricity G3The recovered load is { L11,L16,L17,L10}，μ30.84, standby power supply G3And completing fault recovery. L is15Only from standby power supply G4Resume power supply, resume L15Back-up power supply G4Has a load factor of mu30.847, the standby power supply G has satisfied the criterion of approaching the load factor expectation value4And completing fault recovery. L is1And L20Only from standby power supply G1Resume power supply, resume L1And L20Rear, standby power supply G1Has a load factor of mu10.481, and a backup power supply G2Has a load factor of mu2＝0.464<μ1. Therefore, the standby power G2Fail-over is performed first. Restoring the load L8Rear, standby power supply G2Has a load factor of mu2And (5) meeting the criterion of approaching the expected value of the load rate, namely 0.867, and completing fault recovery. Residual load L5And L6From a standby power supply G1Recovery, standby power supply G1Has a load factor of mu10.818, the near load rate expectation criterion is met. At this time, the failure recovery of the power system is all completed.
The proposed load balancing failure recovery method (LB) is combined with other intelligent methods: the fault recovery results of the Standard Genetic Algorithm (SGA), the Adaptive Genetic Algorithm (AGA) and the cloud-theoretic adaptive genetic algorithm (CAGA) are compared, and the comparison of the load and the load rate of each backup power supply after fault recovery is shown in table 3. As can be seen from table 3, the fault recovery method using load balancing can meet the requirement of power supply recovery to the maximum extent, and realize load balancing after fault recovery to obtain the optimal fault recovery scheme; however, other methods cannot realize load balancing after fault recovery, and a standby power supply with a high load rate is easily overloaded when the load changes or fault recovery is performed again, so that normal operation of a specific power system is affected. The fault recovery algorithm is compiled in an MATLAB simulation environment, and after running tests, fault recovery can be completed within 10ms, while an intelligent method is adopted, and the fault recovery time is 3-28 s. Therefore, the fault recovery time of the proposed fault recovery method is obviously shorter than that of an intelligent method, and the fault recovery of a specific power system can be quickly realized, so that the fault loss of the power system is reduced to the minimum.
TABLE 3 comparison of failure recovery results
Figure BDA0003110616330000071
The method is suitable for the specific power system, the load rate expected value is taken as a target, the load power supply of the fault recovery area is sequentially recovered according to the sequence of the load rate of the standby power supply from low to high, the rapid fault recovery of the specific power system is realized, the load balance after the fault recovery is realized, the fault recovery speed of the specific power system is improved, the loss caused by the fault is reduced, the robustness of the power system is enhanced, and the safe and stable operation of the power system is ensured
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (8)

1. A load-balanced rapid fault recovery method for a specific power system is characterized by comprising the following steps: the steps of load balancing fault recovery are as follows:
step S1: determining a fault recovery area load, a standby power supply and a fault recovery area load of each standby power supply according to a topological structure and a fault point position of a specific power system;
step S2: calculating the total load capacity of the fault recovery area and the total spare capacity of the spare power supplies, and if the total load capacity of the fault recovery area is smaller than the total spare capacity of all the spare power supplies, jumping to step S5; otherwise, executing the following steps;
step S3: if the total important load capacity of the fault recovery area is smaller than the total standby capacity of the standby power supply, taking the important load of the fault recovery area as the load of the fault recovery area, and turning to the step S5; otherwise, executing the following steps;
step S4: according to the importance degree of the load in the fault recovery area, sequentially recovering each important load, and going to step S8;
step S5: calculating a load rate expected value of the standby power supply;
step S6: according to the sequence of the load rates of the standby power supplies from low to high, taking a load rate expected value as a target, and sequentially carrying out fault recovery on the loads of the corresponding fault recovery areas by each standby power supply;
step S7: if all the backup power supplies do not complete the fault recovery, go to step S6; otherwise, executing the following steps;
step S8: if the load is not recovered, sequentially recovering the power supply of each load according to the importance degree of the load;
step S9: and forming a fault recovery scheme according to the fault recovery path of each standby power supply, determining a switch action set of fault recovery, and sending an opening/closing command to a corresponding switch, thereby realizing the fault recovery of a specific power system.
2. The method for rapid fault recovery of a load-balanced specific power system according to claim 1, wherein: the definition of the backup power supply is: the power supply of the power-losing load and the power supply connected with the power-losing load through the interconnection switch are called as standby power supplies and participate in fault recovery.
3. The method for rapid fault recovery of a load-balanced specific power system according to claim 1, wherein: the fault recovery zone load is defined as: all loads connected to two or more backup power sources through two or more switches, respectively, are referred to as fail-over area loads.
4. The method for rapid fault recovery of a load-balanced specific power system according to claim 1, wherein: the fault recovery load of the backup power supply is defined as follows: all the fail-over area loads connected to a certain backup power source through one switch are referred to as fail-over loads of the backup power source.
5. The method for rapid fault recovery of a load-balanced specific power system according to claim 1, wherein: the goals of fault recovery include: (1) recovering the power supply of the important load preferentially; (2) the power supply of the power-losing load is recovered to the maximum extent; (3) load balancing after fault recovery; (4) the out-of-limit element does not appear after fault recovery, wherein the objective function is defined as follows:
Figure FDA0003110616320000021
Figure FDA0003110616320000022
Figure FDA0003110616320000023
Figure FDA0003110616320000024
in the formula: i isILAll important negatives for the fault recovery zoneCharge equivalent current; w is aiAn importance level coefficient for the ith important load; i isILiIs the ith important load current; k is the number of important loads; i isRLAll load currents removed after fault recovery; i isCLiFor the ith load current removed; t is the number of load shedding; b isLIs a load balancing function; mu.si、μjThe load ratios of the ith standby power supply and the jth standby power supply are respectively; u is the number of standby power supplies; i isaLiActual supply current for the ith backup energy source; i ismaxiThe maximum allowable current of the ith backup energy source.
6. The method for rapid fault recovery of a load-balanced specific power system according to claim 1, wherein: in step S5, the expected load factor of the backup power source is calculated as follows:
Figure FDA0003110616320000025
in the formula:
Figure FDA0003110616320000026
the expected load rate value of the standby power supply is obtained; mu.siThe load rate of the ith standby power supply before fault recovery is carried out; i ismaxiThe maximum allowable current of the ith standby power supply; i isLjLoad current for jth in the fault recovery zone; n is the load number of the fault recovery area; u is the number of standby power supplies.
7. The method for rapid fault recovery of a load-balanced specific power system according to claim 1, wherein: the criterion that the load rate of the standby power supply is close to the expected load rate is as follows:
Figure FDA0003110616320000027
in the formula: i isoiFor fault recoveryActual load current of the standby power supply i before recovery; i isLijThe jth load current restored for the standby power supply i; d is the number of fail-over zone loads for which the backup power source i has recovered. When the above formula is satisfied, the load rate of the backup power source i has approached the load rate desired value, and the fault recovery of the backup power source is completed.
8. A load-balanced, rapid fault recovery system for a specific power system, comprising a computer and a network device, and a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein: the processor, when executing the computer program, implements information exchange and data processing with an external device through a network device, thereby implementing the method according to any one of claims 1 to 7.
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