Final power quality regulating and controlling device for power distribution network and regulating and controlling method

Abstract

The invention belongs to the field of power quality management, particularly relates to the fields of regulating and controlling of unbalanced load of a power distribution network, and in particular to a final power quality regulating and controlling device for a power distribution network and a regulating and controlling method. The final power quality regulating and controlling device is used for controlling the final power quality of the power distribution network, so as to manage power quality problems such as harmonic wave, idle work and three-phase imbalance in the final stage of the power distribution network. The final power quality regulating and controlling device has the advantages and beneficial effects that 1. an improved current control method is provided; the method is high in dynamic response speed and good in tracking effect; and the compensation effect is improved; 2. a perfect structure of the final power quality regulating and controlling device for the power distribution network is provided; the control algorithm designed for operation on the device is capable of achieving effective control on the device; a good harmonic suppression effect is achieved; and the functions of compensating reactive power, balancing three-phase load and the like can be achieved; and 3. the device is high in response speed, and can respond to the load change within a short period of time, so as to carry out tracking compensation.

Description

technical field [0001] The invention belongs to the field of power quality control, in particular to the field of regulation and control of power quality in a distribution network, in particular to a power quality control device and method for the final stage of a distribution network. Background technique [0002] The common problems of power quality in distribution network mainly include unbalance, harmonic, voltage fluctuation and frequency deviation. In recent years, with the access of distributed power sources such as photovoltaics and wind power, it has brought a series of adverse effects on the power quality of distribution networks. The output power of photovoltaic power generation and wind power generation changes with changes in the external environment, and fluctuations in output power can easily cause voltage fluctuations in the grid, especially wind power generation with large capacity based on doubly-fed induction generators is likely to cause voltage drops whe...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the compensation effect of the existing compensation measures in the distribution network is limited, the present invention provides a power quality control device and control method for the final stage of the distribution network

Images