Medium voltage distribution network voltage control policy considering voltage characteristics of low voltage transformer areas

Abstract

The invention discloses a medium voltage distribution network voltage control policy considering the voltage characteristics of low voltage transformer areas. The method comprises the steps that from the three aspects of the voltage quality, the power supply and the load rate, the index data accessibility and high influence of an index on the running voltage are used as the principle to determine the evaluation index of six transformer area voltage adjustment priorities of the voltage deviation, the voltage pass rate, the annual power supply, the peak power consumption, the annual load rate and the minimum load rate; low voltage transformer areas covered by the power supply range of a medium voltage distribution network study object are summarized; the original data of the evaluation index of the transformer area voltage adjustment priorities are collected; the index weight is set through an entropy weight method, and the evaluation value of the voltage adjustment priority of each transformer area is solved; and finally the decision dominance of voltage adjustment of each transformer area is analyzed, and the medium voltage distribution network voltage control policy considering the voltage characteristics of the low voltage transformer areas is established. According to the invention, the voltage characteristics of the low voltage transformer areas are included in the influence factor of the policy, which assists a power supply enterprise to improve the overall operation quality of a distribution network.

Description

technical field [0001] The invention relates to the field of voltage analysis and control of a medium-voltage distribution network in a power system, in particular to a voltage control strategy for a medium-voltage distribution network that takes into account the voltage characteristics of a low-voltage station area. Background technique [0002] The power supply range of the medium-voltage distribution network generally covers multiple low-voltage station areas at the same time. The voltage characteristics of each station area vary with its load type (industrial load, commercial load, residential The fluctuation of load rate and the severity of load rate) often have large differences. With the increase of non-linear loads in the distribution network, the fluctuation law of load power consumption is gradually increasing, coupled with the increase of distribution network load rate and the change of load bearing pressure in the station area, higher requirements are put forward...

AI Technical Summary

Problems solved by technology

[0003] However, the optimization idea of ​​the traditional medium-voltage distribution network voltage regulation strategy is relatively simple, that is, without considering the voltage differentiation characteristics of different sub-regions and the dominance of different voltage regulation, in order to improve the voltage operation quality of all low-voltage regions. Target, use reactive power compensation to regulate voltage on 10kV medium voltage feeder

However, among the multiple low-voltage sub-areas of the same feeder, there may be situations where the voltage is too high, the voltage is too low, and the voltage is qualified. Therefore, the voltage regulation strategy on the above-mentioned 10kV medium-voltage feeder often changes multiple low-voltage sub-areas. The head-end voltage, but worsen the voltage qualification rate of each station area

Existing methods are difficult to cope with the diverse demands for voltage in multiple low-voltage stations, and it is impossible to increase the voltage qualification rate of all stations, resulting in a downward trend in the voltage qualification rate of low-voltage stations, which in turn reduces the practicality of voltage control strategies. Value

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