基于可变系数的双馈风机虚拟惯量与超速控制协调的风光柴微电网频率调节技术

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Abstract To improve the frequency stability of the isolated islanding wind/photovoltaic/diesel microgrid,in this paper,the doubly fed induction generator(DFIG) and the diesel turbine are both utilized as the frequency regulation sources.Via coordinating virtual inertia control,rotor speed control,and automatic pitch control strategy,DFIG can cooperate with diesel turbine to restrain the frequency fluctuation caused by the change of the wind speed and the load.When operating at the below-rated wind speed,DFIG adoptsbothvirtual inertia control and over-speed control strategy.On the other hand,when at above-rated wind speed,DFIG utilizes virtual inertia control and automatic pitch control.Therefore,the output power drop during the recovery period of the rotor speed with virtual inertia control can be avoided.Moreover,this combined control strategy can provide permanent power support for the microgrid.In order to guarantee the efficiency of this strategy in a time-varying wind speed,an inertia coefficient curve and a droop control gain curve areplotted by analyzing parameter settings under different wind speeds,and as a result,the variable coefficient control is realized.This paper established the microgrid control model includes the diesel generator,photovoltaic power generator and DFIG using the software DIgSILENT PowerFactory.The simulation results show that this control strategy is valid.

Key words： Microgrid frequency regulation DFIG virtual inertia control overspeed and automatic pitch control variable coefficient

Received: 15 November 2014 Published: 13 April 2015

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TM315

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	Zhao Jingjing
	Lv Xue
	Fu Yang
	Hu Xiaoguang

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Zhao Jingjing,Lv Xue,Fu Yang等. Frequency Regulation of the Wind/Photovoltaic/Diesel Microgrid Based on DFIG Cooperative Strategy with Variable Coefficients BetweenVirtual Inertia and Over-speed Control[J]. Transactions of China Electrotechnical Society, 2015, 30(5): 59-68.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I5/59

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