期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 69, 期 4, 页码 4034-4045出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3071703
关键词
Automatic voltage control; Capacitors; Switches; Insulated gate bipolar transistors; Clamps; Circuit faults; Topology; Cascaded H-bridge (CHB) converter; fault tolerance; static synchronous compensator (STATCOM)
资金
- Iran National Science Foundation
- Alexander von Humboldt Foundation, Germany
This article investigates the operation of cascaded H-bridge based static synchronous compensator (STATCOM) after failure in its submodules. The study proposes a method that injects zero-sequence voltage to generate maximum line-to-line voltage and controls negative-sequence current to manage active power flow in order to ensure capacitor voltage balance.
This article investigates the operation of cascaded H-bridge (CHB) based static synchronous compensator (STATCOM) after failure in its submodules (SMs). Once a switch fails, the corresponding faulty SM is bypassed. In the post-fault operation, a zero-sequence voltage (ZSV) is injected to the converter phases to generate the maximum possible line-to-line voltage. Using a clamping technique, the fundamental component of injected ZSV (FZSV) is minimized according to the operating point of CHB STATCOM. But, FZSV leads to unequal flow of active power into the converter phases. In the proposed method, negative-sequence current is controlled to manage the active power flow within CHB phases. By doing this, the effect of FZSV on active power of CHB phases is compensated and the voltages of capacitors are kept balanced. This method ensures the continuous operation of CHB STATCOM with the minimum over-design and guarantees the voltage balance of capacitors after a failure. The presented simulation and experimental results validate the feasibility and effectiveness of the proposed method.
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