Front feed type voltage drop dynamic compensating device based on complementation of wind electricity and solar electricity

Abstract

A front feed type voltage drop dynamic compensating device based on complementation of wind electricity and solar electricity comprises a controller, a rectification unit, an H bridge inversion unit, a by-pass switch, a wind electricity direct voltage sensor, a wind electricity direct current sensor, an alternating voltage transformer, a direct current boost unit, a solar electricity direct voltage sensor, a solar electricity direct current sensor and a grid connected inverter. When a power grid normally runs, the wind electricity and the solar electricity feed electric energy into the power grid through the grid connected inverter, and output voltage of a series compensator is zero. When the power grid breaks down and voltage of the power grid drops (sinks or suddenly dips), the series compensator is controlled to rapidly output corresponding compensatory voltage so as to directly and dynamically compensate voltage drop and keep voltage of a load end unchanged, and accordingly a load is prevented from being influenced by faults of the power grid, and simultaneously direct current bus voltage is kept stable. The front feed type voltage drop dynamic compensating device based on the wind electricity uses the complementation of the wind electricity and the solar electricity, has the characteristics of complementary front feed and rapid power grid voltage change compensation of the wind electricity and solar photovoltaic electricity generation, and is small in size and low in cost.

Description

technical field [0001] The invention relates to the technical field of power quality, in particular to a feedforward voltage drop dynamic compensation device based on wind and electricity complementarity. Background technique [0002] Developed countries have very high requirements on power quality. Power quality problems will not only bring great economic losses to the industry, such as shutdown and restart, which will increase production costs, damage responsive equipment, scrap semi-finished products, and reduce product quality. Marketing difficulties will damage the company's image and good business relations with users, etc., and will also bring harm to equipment in important power-consuming departments such as medical care, causing serious production and operation accidents. Research by the American Electric Power Research Institute (EPRI) shows that electric energy Quality problems cause US industry to lose 30 billion dollars in data, materials and productivity every ...

AI Technical Summary

Problems solved by technology

However, the problem of energy storage has always plagued the problem of dynamic voltage compensators. Although some advanced methods such as the minimum energy injection method have been proposed, the additional energy storage has always affected its further promotion and development.

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