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| Three-Phase Grid-Connected Inverters Based on PLL and Virtual Grid Flux |
| Yang Yong, Ruan Yi, Tang Yanyan, Ye Binying |
| Shanghai University Shanghai 200072 China |
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Abstract In order to improve reliability and reduce cost for three-phase grid-connected inverters, this paper proposes a novel control strategy based on phased lock loop (PLL) and virtual grid flux without grid voltage sensors. According to the dynamic mathematical model in synchronous rotating frame for three-phase grid-connected inverters, the virtual grid flux vector orientation and d-axis current and q-axis current close-loop control are used, which achieves the decoupling control for d-axis current and q-axis current. The active power and the reactive power for three-phase grid-connected inverters are independently controlled by q-axis current and d-axis current. Experimental results show that the output currents are sinusoidal with less distortion and it has a good dynamic and static performance. So the feasibility and correctness for the control strategy is verified.
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Received: 25 January 2009
Published: 04 March 2014
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2010, Vol. 25 
