Safety assessment method of distribution network operation based on recovery value of distribution network failure and loss of load

Abstract

The invention relates to an operating safety assessment method based on distribution network fault lost load recovery values, belonging to the technical field of power system dispatching automation and power grid simulation. The method comprises the steps of: carrying out N-1 fault scanning on a distribution network, and carrying out recovery and optimization calculation on lost electrical loads in each fault so as to obtain recoverable lost electrical load values; after the scanning is completed, accumulating lost electrical loads recovered each time so as to obtain a total recovered lost electrical load value; and establishing distribution network operating safety indicators according to a total lost electrical load value, a total recoverable lost electrical load value and the total recovered lost electrical load value. During the recovery and optimization of fault lost loads, active, reactive, voltage and radial operating restricted detailed distribution network recovery and optimization models are taken into account, and the problem of mixed integer quadratic constraint programming is solved by adopting a branch and bound method. According to the method, indicators for distribution network operating safety assessment are developed based on the optimization models, and then, the operating conditions and the safety of a network configuration of the current distribution network can be reflected.

Description

technical field [0001] The invention belongs to the technical field of power system scheduling automation and power grid simulation, and in particular relates to a mathematical programming algorithm for load restoration strategy considering detailed models of distribution network active power, reactive power, voltage, and radial constraints, and the operation security based on this restoration algorithm assessment method. Background technique [0002] The power-off load after a fault in the distribution network can often be restored automatically or manually, so the power-off load after a system fault that considers the recovery control factor can better represent the security of the current operation of the distribution network. The existing distribution network safety or reliability assessment methods either do not consider the impact of load recovery, or the recovery model is extremely simple: some studies regard the load loss after isolation as the final load loss under ...

AI Technical Summary

Problems solved by technology

The existing distribution network safety or reliability assessment methods either do not consider the impact of load recovery, or the recovery model is extremely simple: some studies regard the load loss after isolation as the final load loss under N-1 fault scanning, and do not consider Some or all of the lost loads can be restored; some studies focus on the main transformer of the substation or the feeder as a whole, ignoring the specific structure inside the feeder

[0003] Most of the traditional distribution network failure load recovery methods use heuristic methods, intelligent algorithms, etc. These methods either cannot meet the optimality, or the calculation time is too long; some mathematical optimization methods have made great efforts due to the complexity of solving problems. For example, only active power balance and radial constraints are considered when the distribution network is restored, or heuristic rules are added to simplify the calculation, and the strictness of the model and calculation results cannot be guaranteed

[0004] The literature "ConvexModels of Distribution System Reconfiguration" uses a detailed model in the study of distribution network reconfiguration, but this algorithm is not used in the recovery of distribution network failure and load loss, and more variables are introduced when considering network radial constraints in the study

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