采用背靠背变流器接入配电网改善低压微网电压质量的控制设计

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Abstract A control scheme for improvement of voltage quality in low voltage microgrid using back-to-back converter to eliminate the unbalanced voltage disturbance under distribution network unsymmetrical operation is proposed. The instantaneous positive and negative sequence nth harmonic decomposition algorithm in αβ frame based on the second-order generalized integrator was derived. The grid side converter adopts the V/δ control to maintain DC voltage and added the virtual inductor to outer voltage loop to improve the control performance in the low-voltage line with mainly resistive line impedance. According to the power characteristic of voltage source converter on distribution grid unsymmetrical operation, the negative sequence current compensation in inner current loop is developed in grid side converter to mitigate DC voltage fluctuations. The double closed-loop constant V/f control is implemented in the microgrid side converter and the PCC unbalanced voltage is eliminated by the negative sequence and third harmonic voltage control loop in it. Simulation results in PSCAD/EMTDC software show the correctness and effectiveness of the proposed control scheme.

Key words： Microgrid voltage quality unbalanced operation back-to-back converter

Received: 19 March 2012 Published: 25 March 2014

PACS:	TM761
	TM727
	TM61

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	Articles by authors
	Wang Qianggang
	Zhou Niancheng
	Yan Wei
	Shou Ting
	Du Yueming
	Xia Gang

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Wang Qianggang,Zhou Niancheng,Yan Wei等. Control Design for Voltage Quality Improvement of Low Voltage Microgrid Using Back-to-Back Converter Connected to Distribution Network[J]. Transactions of China Electrotechnical Society, 2013, 28(4): 171-181.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I4/171

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