考虑电网阻抗影响的大型光伏电站并网稳定性分析

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Abstract Harmonic problem of the grid-connected inverters was detected in many large-scale photovoltaic(PV) plants and the harmonic problem may occurred even if all the PV inverters do individually satisfy the standards. For these reasons, the effect of grid impedance is considered, and the equivalent circuit model of three-phase grid-connected parallel inverters with LCL filter is established based on the basic structure and operating principle of the PV plants. According to the established equivalent circuit model, the influence of grid impedance in the current control loop is analyzed. Theoretical analysis indicates that grid-connected parallel inverters in PV plants are coupled due to the grid impedance, and the coupling effect can destabilize the inverter current control loop and lead to harmonic content overweight. Moreover, this study is validated by means of simulation and experiment results.

Key words： Large-scale photovoltaic plants grid impedance power quality grid-connected inverters stability

Received: 17 July 2012 Published: 25 March 2014

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TM46

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	Articles by authors
	Yang Ming
	Zhou Lin
	Zhang Dongxia
	Zhang Mi

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Yang Ming,Zhou Lin,Zhang Dongxia等. Stability Analysis of Large-Scale Photovoltaic Power Plants for the Effect of Grid Impedance[J]. Transactions of China Electrotechnical Society, 2013, 28(9): 214-223.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I9/214

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