High-power power quality comprehensive compensation device

Abstract

A high-power power quality comprehensive compensation device comprises a main circuit (1), a main control algorithm implementation circuit (2) and a detection and protection circuit (3). The device transmits an analog signal which is output after passing through an analog signal conditioning circuit to the main control algorithm implementation circuit (2) through the analog signal conditioning circuit in the detection and protection circuit (3). After analog-digital conversion, the control algorithm of the high-power power quality comprehensive compensator is achieved through a DSP chip. A power device IGBT in the main circuit (1) is controlled to emit compensation current in the reverse direction of harmonic current or reactive current in detected load current. Meanwhile, energy compensation can also be performed on unbalanced current of an unbalanced load, and the composite compensation function of the device is achieved.

Description

technical field [0001] The invention relates to a comprehensive compensation device for high-power electric energy quality. Background technique [0002] With the increasing number of nonlinear loads in the power grid, the problem of reactive power and harmonics in the power system is becoming more and more serious. Traditional reactive power compensation devices and harmonic suppression methods are difficult to meet the requirements of modern power grids. As a new type of power quality comprehensive compensation device, based on modern power electronics technology, this device can have strong robustness and excellent dynamic performance to changes in grid load and system parameters, and is considered to be the most promising at present. Reactive power and harmonic comprehensive compensation method. In the AC 380V power grid, the impact of high-power nonlinear loads with a stand-alone capacity above 250kVA on the power grid is very obvious. In order to improve the power qua...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the difficulties in the design of the power quality comprehensive compensation device in the prior art in high-power occasions, the use of a three-phase bridge structure cannot meet the requirements of high-performance compensation, and the use of multiple sets of devices in parallel to realize high-power output devices. Due to the shortcomings of complex structure and reduced reliability, a high-power power quality comprehensive compensation device is proposed

The invention can improve the problems of harmonic pollution and low power factor on the grid side caused by large-capacity nonlinear loads (single unit capacity greater than 250kVA) in the AC 380V power grid

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