Distribution network capacitive current distribution compensation method

Abstract

The invention relates to the technical field of electric power, and specifically relates to a distribution network capacitive current distribution compensation method. The method comprises the steps as follows: S1, getting data information related to a distribution network, and determining the variables of a mathematical model and the value spaces thereof; S2, determining constraint conditions according to the system's requirement for compensation capacity; S3, building an objective function, with the magnitude of grounding residual current as a measure of compensation effect and minimal grounding residual current and lowest cost as the objective; and S4, optimizing and solving the objective function to get an optimal configuration scheme. According to the distribution compensation method, the configuration scheme of arc suppression coil distribution compensation is determined reasonably based on the magnitude of capacitive current of each line and by considering the possibility of line operation mode change. Thus, the resonance phenomenon caused by capacity decrease of the arc suppression coil is avoided, and a good compensation effect is achieved with small investment on equipment transformation.

Description

technical field [0001] The invention belongs to the technical field of electric power, in particular to a method for compensating distribution network capacitance current distribution. Background technique [0002] With the continuous improvement of the urban cable conversion rate, many new arc suppression coils appear to have insufficient capacity and need to be replaced by capacity expansion. After several transformations, it is no longer possible to increase the capacity on the original basis. If the complete set of equipment is replaced, the investment is relatively large. More importantly, when the capacitive current is too large, it is difficult to obtain a better compensation effect by using the traditional centralized arc suppression coil compensation method. Therefore, it is considered to carry out distributed compensation on the line, that is, divide the large capacitive current to be compensated into several small parts, and perform compensation on other lines o...

AI Technical Summary

Problems solved by technology

[0004] If the capacity allocation of arc suppression coils is randomly carried out on the line according to the total capacity demand of the distribution network, then in the case of a line cut off or transferred, the corresponding arc suppression coil equipment will also withdraw from the grid or transfer, which may cause In the new operating state, the arc suppression coil capacity configuration is insufficient or the adjustment lower limit is too high

When the capacity is insufficient, resonance phenomenon is easy to occur, and the neutral point voltage is too high; if the adjustment lower limit is too high, the arc suppression coil may not be able to achieve full compensation when a single-phase ground fault occurs

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