基于相位裕度补偿的大型光伏电站谐波谐振抑制策略

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Abstract

The influence of the grid impedance to large-scale photovoltaic(LSPV) plants is studied through analyzing its effect on each inverter in LSPV plants.According to studies on active damping and stability margin,the grid impedance variation does not make active damping ineffective.Instead,it attenuates the stability margin.The harmonic resonance mechanism has been revealed by researching the influence of stability margin reduction on current closed-loop gain around the open loop cutoff and phase crossover frequencies.Amplification to harmonics at the open loop cutoff frequency or the phase crossover frequency will be strengthened with the decrease of the stability margin.The amplification tends to be infinite when the stability margin reduces to zero,which will trigger harmonic resonance.Anovel suppression strategy based on phase margin compensation is then proposed.The phase margin compensation is realized by using the leading network to compensate the phase and the proportional component to regulate the open loop cutoff frequency in the strategy.The suppression strategy can keep enough stability margins for the system which will suppress the harmonic resonance essentially.The result of simulation and experiment validate the theory analysis in the paper.

Key words： Large-scale photovoltaic plants phase margin compensation harmonic resonance mechanism suppression strategy grid impedance

Received: 07 May 2015 Published: 02 November 2016

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TM615

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	Zheng Chen
	Zhou Lin
	XieBao
	Guo Ke
	Liu Qiang

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Zheng Chen,Zhou Lin,XieBao等. The Harmonic Resonance Suppression Strategy of Large-Scale Photovoltaic Plants Based on Phase Margin Compensation[J]. Transactions of China Electrotechnical Society, 2016, 31(19): 85-96.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I19/85

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