Control method of APF-TCR combined operation system with harmonic and reactive power dynamic compensation

Abstract

The invention discloses a control method of an APF-TCR combined operation system with harmonic and reactive power dynamic compensation, and relates to the field of electric energy quality control. TheAPF-TCR combined operation system is composed of parallel APF and TCR in series. The combined operation system is connected to a power grid in parallel. The parallel APF is composed of a three-phasefull bridge, an AC side filter inductor and a DC side energy storage capacitor. The TCR is composed of a bidirectional thyristor controlled adjustable reactor with parallel reactive power compensationcapacitor. The control method of the combined operation system includes an APF control method and variable inductance nonlinear control. The TCR provides a wide range of reactive power and undertakesmost of the fundamental voltage difference between PCC voltage and APF so the voltage stress of the APF is greatly reduced. Besides, the APF can make up the deficiency of the TCR, such as current impulse, resonance, noise and lack of noise and harmonic compensation capacity caused by thyristor turn-on and turn-off or trigger angle offset, etc.

Description

technical field [0001] The invention relates to the field of electric energy quality management, in particular to a method for controlling an APF-TCR combined operation system with harmonic and reactive power dynamic compensation, which is suitable for reactive power and harmonic compensation working conditions in medium and low voltage distribution networks. Background technique [0002] With the development of power electronics technology, more and more variable frequency power supplies are incorporated into the power grid. The front stage of these power supplies is usually a rectifier bridge. In order to avoid pollution to the power grid, its harmonics and reactive power need to be compensated. Passive filters (passive filters, PF) can filter out specific harmonics, and thyristor controlled reactors (thyristor controlled reactors, TCR) can provide continuously adjustable reactive power. The cost of PF and TCR is low, and the implementation scheme for high-voltage and lar...

AI Technical Summary

Problems solved by technology

At present, most of the joint operation schemes of APF and TCR proposed in the literature are directly connected in parallel at the common coupling point to realize the comprehensive dynamic control of harmonics and reactive power, the optimal design of coupling transformers, passive filter banks, cascade inverters The control system design of the controller is more complex

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