Transactions of China Electrotechnical Society  2015, Vol. 30 Issue (增刊2): 128-134    DOI:
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Operational Principle and Control of the Nine-Switch Converter for Unified Power Quality Conditioner
Guo Jia1, Duan Jiandong1, Sun Li1, Wang Zhigang2
1. Electromagnetic Drive and Control Research Institute Harbin Institute of Technology Harbin 150001 China;
2. CNPC JICHAI Power Equipment Company Jinan 250306 China

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Abstract  For dealing with the shortcomings of the unified power quality conditioner including considerable amount of power electronic devices and its complex structure, the paper proposes to replace the back-to-back double PWM converter with the nine-switch converter as the main circuit topology. Nine-switch converter has some advantages such as less switching devices, lower cost, smaller volume and etc. Firstly, the paper introduces the principle and modulation strategy of the nine-switch converter. Secondly, it analyzes steady-state circuit in the case of the voltage sag compensation and reveals the relationship between terminal voltage of the voltage and current compensation ports. According to the above analysis results, the occupancy ratio of the DC voltage can be dynamically allocated between the two output ports to effectively reduce the DC voltage requirement of the system. Then it gives a brief description of the control algorithms of the proposed topology. Finally, the paper verifies the feasibility of the proposed alternatives through simulation and experiment.
Key wordsNine-switch converter      unified power quality conditioner      voltage sag compensation      reactive power compensation      harmonic suppression     
Received: 21 September 2015      Published: 18 August 2016
PACS: TM714  
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Guo Jia
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Guo Jia,Duan Jiandong,Sun Li等. Operational Principle and Control of the Nine-Switch Converter for Unified Power Quality Conditioner[J]. Transactions of China Electrotechnical Society, 2015, 30(增刊2): 128-134.
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https://dgjsxb.ces-transaction.com/EN/     OR     https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I增刊2/128
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