A dynamic power supply recovery method based on a load curve -based power distribution network

Abstract

The invention provides a power distribution network dynamic power restoration method based on a load curve, which belongs to the technical field of power distribution system automation. The method utilizes a computer, realizes computing through programs and comprises the steps of inputting basic parameters; computing active load and reactive load of each node in each hour and determining a grid structure in normal operation; determining a fault section, a power supply path of the power side of the fault section and a grid structure after failure isolation; applying a traditional genetic algorithm to determine a candidate grid structure set of the least loss load in each hour during fault restoration; finally determining the optimum dynamic power restoration scheme during fault restoration. The method fully utilizes the load curve, and the dynamic restoration scheme is formulated by hour, so that the grid structure changes along with the change of the load during fault restoration, and accordingly, the method has the characteristics of being capable of effectively reducing power failure areas caused by fault, shortening power failure time for users, reducing the power failure loss of the users, and the like. The method can be widely applied to power distribution network power restoration.

Description

technical field [0001] The invention belongs to the technical field of power distribution system automation, and in particular relates to a load curve-based dynamic power supply recovery method for a power distribution network. Background technique [0002] Electric energy is closely related to people's production and life, and reliable and continuous power supply is one of the basic requirements for the operation of the power system. The distribution network connecting the transmission network and users is an important link in the distribution of electric energy and an important part of the power system. It is difficult to avoid the occurrence of faults in the actual operation of the large-volume and wide-area distribution network. The power outage will cause economic losses to users and affect people's quality of life. Therefore, the distribution network often adopts closed-loop design and open-loop operation, so as to It can effectively restore the power supply of the po...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ①The specified time period in this method actually refers to the fault repair time, so the load change can only be considered according to the fault repair time, and the load change with time during the fault repair period cannot be considered by hour; ② The adopted principle of terminating the power supply recovery process will lead to abandoning the power supply recovery scheme that will not overload the feeder receiving the load of the power outage section during a certain period of time during the fault recovery period, resulting in an increase in the partial load power outage time; ③ during the fault recovery During this period, only one grid structure can be obtained, and the grid structure cannot be adjusted according to load changes to reduce the power outage time of users; ④After obtaining the final power supply restoration scheme, it is judged whether the scheme satisfies the voltage constraint through power flow calculation. When the voltage is constrained, it is impossible to formulate a reasonable power supply recovery plan

Therefore, this method cannot make full use of the law of load changes over time to formulate an effective power supply restoration plan, and cannot reduce the power outage area caused by the fault and shorten the power outage time of the user, thereby failing to reduce the power outage loss of the user

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