微网中下垂控制策略及参数选择研究

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Abstract To improve the applicability of conventional P-f and Q-V droop control methods of inverters in middle-voltage and low-voltage microgrids, this paper puts forward a novel control method of using virtual inductance and artificial output inductance in combination. A multiple feedback loop control strategy is proposed, the state-space equations are derived, and a complete small-signal model is established. Based on this, the matching principle of choosing virtual inductance and artificial output inductance is proposed. The inductance value is reduced significantly according to this principle, so problems of system stability and power loss are overcome. Simulation and analysis under linear and nonlinear load show that the proposed control strategy and parameter selecting method can not only enhance the output inductance of inverters, thus reduce the interference by line parameters, and also provide accurate load sharing, and inhibit circulating current effectively. This paper provides a new strategy for using conventional droop control in middle-voltage and low-voltage network.

Key words： Microgrid droop control virtual impedance matching principle small-signal model

Received: 26 May 2013 Published: 18 June 2014

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TM727

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	Zhang Mingrui
	Du Zhichao
	Wang Shaobo

Cite this article:

Zhang Mingrui,Du Zhichao,Wang Shaobo. Research on Droop Control Strategy and Parameters Selection of Microgrids[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 136-144.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I2/136

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