ANALYZING THE REACTIVE CURRENT CONTROL STRATEGY OF THE STATCOM CHAIN

Tran Thi Ngoat; Nguyen Thi Khanh; Le Ngoc Giang

Tran Thi Ngoat Hung Yen University of Technology and Education
Nguyen Thi Khanh Hung Yen University of Technology and Education
Le Ngoc Giang Air Defence - Air Force Academy

Keywords: Robust L2 performance, STATCOM chain, reactive current control

Abstract

This paper design of Robust L2 performance criteria of STATCOM chain. For this method, it changes control of STATCOM chain to control of single Bridge-H converting unit through equivalent circuit transformation firstly. On the basis of established mathematical model of single Bridge-H converting unit that considers influences of parameter perturbation and unknown interferences, it transfers influence of parameter perturbation in error system equation to part of periodic interference. Then it has realized design on current controller of STATCOM chain based on Robust L2 performance criteria through new method that combines repetitive control and passive control. Hereinto, repetitive control compensates periodic interferences and passive control ensures convergence of repetitive control and gradual tracking on control target and restrains influence of nonperiodic interferences at the same time.

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