Fault tolerant control strategy for modular PWM current source inverter

2022年第16卷第6期

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《能源前沿（英文）》 doi: 10.1007/s11708-022-0852-6

Fault tolerant control strategy for modular PWM current source inverter

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收稿日期：2022-05-05 录用日期： 2023-01-13 发布日期：2023-01-13

摘要

In this paper, a fault-tolerant control method for an input-series output-parallel modular grid-tied pulse-width modulation (PWM) current source inverter is proposed to address the most commonly seen single symmetrical gate-commutated thyristor (SGCT) open-circuit fault problems. This method actively offsets the neutral point of the current space vector to ensure a sinusoidal output of the grid current, and it can achieve the upper limit power of the inverter under the condition of a single SGCT open-circuit fault. In addition, an active damping control method based on grid harmonic current feedback is proposed after analyzing the influence of the transformer ferromagnetic resonance caused by the neutral point offset on the power quality of the grid current. It has been demonstrated that the proposed method effectively suppresses the resonance caused by the transformer and the modified modulation, improving the grid current’s power quality.

关键词

current source converter (CSC) ; fault-tolerant control ; space vector modulation ; active damping ; resonance suppression ; power quality

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