Electric energy quality regulating device based on reactive compensation capacitor and method for controlling electric energy quality regulating device

Abstract

The invention relates to the field of electric energy quality control and discloses an electric energy quality regulating device based on a reactive compensation capacitor and a method for controlling the electric energy quality regulating device. The electric energy quality regulating device based on the reactive compensation capacitor comprises conversion modules which are connected in parallel between a single-phase power grid and a nonlinear load, wherein each conversion module comprises an inductance-capacitance (LC) filter, a step-down direct alternating current to alternating current conversion circuit and the reactive compensation capacitor. The electric energy quality regulating device based on the reactive compensation capacitor provided by the invention performs pulse width modulation on a switching tube through duty ratio even-order harmonic modulation, can dynamically compensate reactive current and harmonic current on the power side of the power grid, and can well manage harmonic wave in a distribution network.

Description

technical field [0001] The invention belongs to the field of power quality control, and relates to a reactive power compensation capacitor-based power quality adjustment device and a control method thereof. Background technique [0002] With the development of power electronic technology, the application of power electronic devices in industry is becoming more and more extensive. Uncontrolled rectifiers and phase-controlled rectifiers are widely used as the input stage of power supply devices. While conveniently realizing AC-DC conversion, a large number of harmonics and reactive currents are caused on the grid side, which in turn causes voltage distortion at common connection points and seriously affects Power quality. If the power factor and harmonic distortion cannot meet the standards stipulated by the power grid, industrial users will be fined a lot. [0003] Dynamic reactive power compensation devices, such as static reactive power compensator SVC composed of fixed c...

AI Technical Summary

Problems solved by technology

The matrix converter is not reliable because of its large number of bidirectional power switching devices and complex control strategies.

The step-up direct AC-AC converter has a theoretical lower limit for reactive power compensation under the rated grid voltage, and the device needs to withstand a voltage that is several times the peak value of the grid voltage during operation. In some occasions with specific requirements , nor is it a suitable structure for reactive power and harmonic control devices

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