微网主从控制模式下的稳定性分析

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Abstract This paper is focused on the analysis of the stability problems in a master-slave control based microgrid under islanded mode. The mathematic model of the considered microgrid based on discrete-time state equations is built firstly. Then through eigenvalues analysis, a pair of the high-frequency complex conjugate eigenvalues of the system characteristic matrix will move outside the unit cycle in the z plane with the variation of the proportion gain of the voltage loop of the master inverter. The number of slave converters and the local load parameters, which is shown by the PSCAD simulation results, where high-frequency oscillatory components occur in the AC bus voltage and the output currents of both the master and slave inverters. Consequently, band-pass filter based on a second-order generalized integrator(SOGI) is adopted for the feedback loop of the master converter voltage control, in order to improve the system stability and ensure the stable operation of the microgrid, which eventually verified on the master-slave microgrid built in the PSCAD simulation software.

Key words： Microgrid master-slave control small signal stability eigenvalues analysis second- order generalized integrator(SOGI)

Received: 12 December 2013 Published: 18 June 2014

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TM712

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	Li Xialin
	Guo Li
	Wang Chengshan

Cite this article:

Li Xialin,Guo Li,Wang Chengshan. Stability Analysis in a Master-Slave Control Based Microgrid[J]. Transactions of China Electrotechnical Society, 2014, 29(2): 24-34.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I2/24

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