一种基于方波注入的星形级联静止同步补偿器的负序电流补偿策略

doi:10.19595/j.cnki.1000-6753.tces.210008

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Abstract When star-connected cascaded H-bridge STATCOM compensates for the negative sequence current, the active power among clusters will be unbalanced, which will cause unbalanced cluster voltage. To maintain cluster voltage balance, zero sequence voltage is usually injected to redistribute the three-phase active power. However, the traditional calculation algorithms of the zero-sequence voltage are generally derived from the model based on active power, the equations are complicated and the mathematical mechanism is unclear. In addition, the injection of zero sequence voltage will greatly increase the output voltage of STATCOM, thus limiting the compensation range of the negative sequence current. This paper explores the geometric mechanism between zero sequence voltage and other electrical quantities with the help of voltage phasor diagrams, and proposes a special method for solving zero sequence voltage. To extend the range of the negative sequence current, this paper also studies a zero-sequence voltage injection method in the form of a square wave to improve the DC side voltage utilization of STATCOM. Finally, 10kV/±1Mvar star CHB STATCOM simulation platform and 400V/±7.5kvar experimental testbench verify the proposed control method.

Key words： Cascaded H-bridge STATCOM zero sequence voltage injection cluster voltage balancing negative sequence current compensation

Received: 04 January 2021

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TM461

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	Lu Daorong
	Wei Miaoyu
	Yu Yu
	Zhang Yuming
	Hu Haibing

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Lu Daorong,Wei Miaoyu,Yu Yu等. Zero-Sequence-Voltage Injection Based on Square-Wave to Balance Cluster Voltages for Star-Connected Cascaded STATCOM[J]. Transactions of China Electrotechnical Society, 2022, 37(6): 1482-1494.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210008 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I6/1482

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