光伏并网三相电流型多电平变流器拓扑与控制

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Abstract Since photovoltaic cell behaves the characteristics of current source, current-source converter (CSC) is suitable for grid-connected photovoltaic (PV) system. Using multilevel structure has the advantages of good sinusoidal current wave, direct control to output current, low current stress for switching device and high equivalent switching frequency. A grid-connected PV system based on a new three-phase multilevel CSC is proposed, herein two PV modules are used as the DC supplies. Two DC-DC converters are inserted behind PV modules to implement maximum power point tracking (MPPT). On the grid side, a new three-phase multilevel CSC is used as grid-connected converter, by implanting PD-PWM technique of multilevel voltage-source converter (MVSC) into such multilevel CSC, which can effectively reduce the harmonic distortion. Combined with phase lock loop (PLL) and power decoupling control, the grid-connected strategy for such multilevel CSC is obtained to achieve random power factor (PF) operation. All the proposed concepts are verified by simulation models built in PSIM.

Key words： Photovoltaic grid-connection current-source multilevel converter maximum power point tracking PD-PWM power factor

Received: 22 April 2014 Published: 28 April 2016

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TM464

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	Bao Jianyu
	Bao Weibing
	Li Yuling

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Bao Jianyu,Bao Weibing,Li Yuling. Topology and Control of Three-Phase Multilevel Current-Source Converter for Photovoltaic Grid-Connection[J]. Transactions of China Electrotechnical Society, 2016, 31(8): 70-75.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I8/70

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