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Current Controller Optimum Design for Three-Phase Photovoltaic Grid-Connected Inverter |
Dou Wei, Xu Zhengguo, Peng Yanchang, Li Jing, Xu Honghua |
Institute of Electrical Engineering , Chinese Academic of Science Beijing 100080 China |
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Abstract Three-phase grid-connected voltage source inverter(VSI) is often used to feed high quality current into grid in photovoltaic(PV) power generation system. But many factors, such as switching dead-time effects and disturbance of grids etc, will deteriorate the current waveform, and a large number of harmonic will be fed into grid too. Owing to the conflict between stability and fast response, proportional-integral (PI) controller has limited capabilities to restrain harmonic disturbances and can not guarantee the output performance of grid-connected inverter, so a new control algorithm using compound controller constituted by repetitive controller(RC) and PI controller is proposed in this paper to overcome the shortcomings of PI controller in harmonic control. A dynamic model of grid-connected inverter in synchronous rotating frame(SRF) is derived and the compound current controller design is presented too. Theoretic analysis and experimental results on a 20kW prototype verify that the proposed current controller offers a high performance of current control.
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Received: 20 June 2008
Published: 04 March 2014
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About author:: Dou Wei male, born in 1977, PhD degree, his research interests are in power electronics and control technique in PV power generation systems.Xu Zhengguo male, born in 1974, PhD degree, his research interests are in power electronics and control technique in PV power generation systems. |
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