Flexible interconnection device capacity configuration optimization method based on N-1 security assessment of power distribution network

Abstract

The invention provides a flexible interconnection device capacity configuration optimization method based on N-1 safety evaluation of a power distribution network. The method comprises the following steps: respectively constructing a minimum power-loss load objective function and a minimum tie line switch action frequency objective function of the power distribution network; determining an N-1 safety assessment anticipated accident set according to the minimum power-losing load objective function; determining a power distribution network general constraint and a power distribution network operation constraint; solving an objective function of the minimum power-losing load and the minimum call wire switch action frequency; and further determining the current converter capacity of the optimized flexible interconnection device. According to the method, the optimized power of the converter of the flexible direct current device after different branch faults can be calculated, so that the power-loss load of the power distribution network and the action times of a branch tie line switch are as small as possible, the power-loss load of the power distribution network after an N-1 fault occurs is further reduced, reactive power support is provided, and reactive power transmission of the branches of the power distribution network is reduced; therefore, the operation reliability and the power supply safety of the power distribution network are improved.

Description

technical field [0001] The invention relates to the technical field of power grid optimization operation, in particular to a capacity configuration optimization method for flexible interconnection devices based on distribution network N-1 security assessment. Background technique [0002] The flexible interconnection distribution network realizes the interconnection of different partitions / feeders by adding flexible DC devices, which can solve the problem that the traditional distribution network cannot achieve emergency power support due to open-loop operation. [0003] At present, the optimization strategies for capacity allocation of flexible interconnection devices mainly focus on static security analysis, maximum power supply capacity analysis, capacity allocation and operation optimization of flexible DC devices, etc. Mainly include: study the piecewise linear relationship between the capacity of the flexible interconnection device and the maximum reactive power output...

AI Technical Summary

Problems solved by technology

If the capacity allocation is only considered with certain constraints, it cannot reflect the actual operation of the system, nor can it achieve the goal of optimal capacity allocation.

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