A reactive power compensation device and its control method

Abstract

The invention provides a reactive power compensation device, which includes an execution circuit, a sampling control circuit and a trigger module. The execution circuit includes a thyristor unit and a filter circuit unit. The sampling control circuit includes a zero-crossing module, a synchronization module and a compensation module, wherein: the The thyristor unit is connected to the zero-crossing module, and is also connected to the filter circuit unit to form a connection. The connection is respectively connected to the zero-crossing module and the synchronization module. The thyristor unit includes A, B, and C three-phase thyristors. The filter circuit unit includes the first One, two, three inductors and the first, second, and third capacitors, the reactive power compensation device with this structure can not only solve the technical problems of delayed conduction in three-phase continuous and fast switching, but also affect the compensation effect and current balance. , and achieve the beneficial effects of simple wiring, small space occupation, cost saving and good compensation characteristics.

Description

technical field [0001] The invention provides a reactive power compensation device, in particular to a reactive power compensation device and a control method thereof for fast and synchronous switching outside the three-phase capacitor angle. Background technique [0002] At present, the main problem facing the power distribution network is how to provide users with safe, reliable, high-quality and economical power. With the development of modern industrial technology, power electronic devices have been widely used in power systems, and the contradiction between insufficient reactive power and harmonic hazards has become increasingly prominent. Therefore, reactive power compensation and harmonic suppression are particularly important to achieve the above goals. [0003] Most of the traditionally used dynamic reactive power compensation devices adopt the outer delta connection method, that is, in the three-phase co-compensation capacitor group, the internal connection has be...

AI Technical Summary

Problems solved by technology

Although the compensation effect can meet the requirements in most cases, in the automotive industry, where the load changes rapidly and the reactive power demand is large, the traditional zero-crossing switching cannot guarantee the three-phase synchronous conduction

On the contrary, it will bring imbalance to the system due to the conduction delay of a certain phase, causing a large neutral current to appear.

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