Wind-powder-based electric power quality cascade compensation method and device

Abstract

The invention discloses a wind-powder-based electric power quality cascade compensation method. The method comprises the following steps of: converting wind energy into alternating current and outputting the alternating current by a wind driven generator; converting the alternating current output by the wind driven generator into stable direct current by adopting a rectifier module, and performing tracking control at the highest power on the rectifier module to ensure that the active power of the direct current output by the rectifier module is maximum; converting the direct current output by the rectifier module into alternating current; and detecting the voltage of an electric network, and if the voltage of the electric network is reduced, controlling an H-bridge inversion unit to output alternating current to compensate the voltage drop of the electric network. Correspondingly, the invention also discloses a wind-powder-based electric power quality cascade compensation device, and the device comprises the wind driven generator, the rectifier module, the H-bridge inversion unit, a grid-connected inverter, a controller and the like.

Description

Technical field [0001] The invention relates to a method and device for power grid voltage compensation, in particular to a method and device for power quality series compensation based on wind power. Background technique [0002] Developed countries have very high requirements for power quality. Power quality problems will not only bring great economic losses to the industry, such as stoppages and restarts will increase production costs, damage sensitive equipment, scrap semi-finished products, reduce product quality, and cause Marketing difficulties will damage the company’s image and good business relationships with users, etc., and will also bring harm to the equipment of important power-using departments such as medical care, causing serious production and operation accidents. A study by the American Electric Power Research Institute (EPRI) shows that power quality problems cause US industries to lose up to 30 billion US dollars in data, materials, and productivity every yea...

AI Technical Summary

Problems solved by technology

Compared with UPS, dynamic voltage compensator can effectively solve the problem of voltage sag. However, the energy storage problem has always plagued the research of dynamic voltage compensator. Although some advanced methods such as minimum energy injection method have been proposed, the additional energy storage Always affect its further promotion and development

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