Low-voltage management method for coordinated control of transformer tap-changer and distributed power supply

Abstract

The invention relates to a low-voltage management method for coordinated control of a transformer tap switch and a distributed power supply, and belongs to the technical field of low-voltage governance. According to the invention, the management of the low voltage of the power distribution network is realized by a method of combining voltage control of a transformer substation and reactive power and active power control of the distributed power supply. Firstly, rough adjustment of low voltage of a power grid is realized by changing the position of a tap switch of a main transformer; furthermore, the voltage of the line is locally adjusted by changing the active power and the reactive power of the distributed power supply in the line, so that the voltage of the power distribution network isaccurately adjusted, and the effect of balancing the voltage of the whole line is achieved; and finally, the state of the distributed power supply is adjusted through recovery control, the active power and reactive power of the distributed power supply are optimized, and the influence of voltage regulation control on the power generation efficiency of the distributed power supply is reduced to the maximum extent. According to the invention, the problem of low voltage of the power distribution network is solved, the distributed power supply is fully utilized, and the cost of low voltage management of the power distribution network is reduced.

Description

technical field [0001] The invention belongs to the technical field of low-voltage control, and in particular relates to a low-voltage control method for coordinated control of a transformer tap changer and a distributed power supply. Background technique [0002] In recent years, with the continuous expansion of distribution network lines and the substantial increase in power load, the problem of low voltage at the end of some single-radiation and long-distance distribution network power supply lines has become increasingly prominent, especially during peak power load periods. With the increasing requirements of electricity consumers for power supply stability and power quality, the problem of low voltage has seriously affected the normal production and living electricity consumption in some areas. At present, the method of controlling low voltage is mainly to adjust the voltage by adjusting the tap changer of the main transformer of the substation. This method is simple an...

AI Technical Summary

Problems solved by technology

At present, the method of controlling low voltage is mainly to adjust the voltage by adjusting the tap changer of the main transformer of the substation. This method is simple and convenient, but the head and end of the line must be adjusted uniformly. When the voltage difference between the head and the end is large, the voltage balance of the entire line cannot be guaranteed; The method cannot fully take into account the voltage balance problem of the entire line. There may be situations where the voltage at the first end or the end meets the demand but the voltage at the other end cannot meet the demand. For example, the patent "A Low Voltage Control Device"

If taking into account the voltage balance of the entire line, it is necessary to adopt passive methods such as network reinforcement. This method needs to add additional control devices, which increases the cost of low-voltage control; Voltage management device》

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