串并联补偿式不间断电源四象限360°运行机理分析

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Abstract Series-parallel compensated uninterruptible power supply (UPS), as a new UPS, consists of back-to-back bidirectional converters, and can achieve power flow control and four-quadrant 360 degree operation. Based on the principle of power balance of gird and load side, the power flow mechanism of series-parallel compensated UPS is analyzed in detail in this paper with grid voltage fluctuations. The two converters can cooperatively work. One operates in the rectifier state, and the other operates in the inverter state, so that the inadequate or excess energy can be regulated. Meanwhile, the compensated UPS can achieve the gird side unit power factor and stable sinusoidal output voltage. The four-quadrant operation mechanism of series-parallel compensated UPS under different load conditions is analyzed in detail, and the phasor diagrams of resistance, capacitive and inductive load are obtained. Hence, the operating region state diagrams are obtained. The operation angle ranges of series-parallel compensated UPS are thereafter determined. Finally, the theoretical analysis is verified by simulation and experiment.

Key words： Compensated uninterruptible power supply, four quadrant operation, back-to-back converter, voltage fluctuation

Received: 18 August 2016 Published: 02 May 2017

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TM761

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	Zhao Xiaojun
	Zhang Chunjiang
	Liu Ming

Cite this article:

Zhao Xiaojun,Zhang Chunjiang,Liu Ming. Four-Quadrant 360 Degree Operation Mechanism Analysis of Series-Parallel Compensated Uninterruptible Power Supply[J]. Transactions of China Electrotechnical Society, 2017, 32(8): 237-246.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I8/237

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