Z源/准Z源逆变器在光伏并网系统中的电容电压恒压控制策略

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Abstract With unique impedance network and shoot-through, Z-source inverter (ZSI)/ quasi-Z-source inverter (qZSI) can realize buck/boost and DC-AC conversion in a single stage system. It is suitable for grid-connected photovoltaic (PV) power generation systems, where the input voltage varies in a wide range. By taking voltage-source qZSI with continuous input current as an example, this paper provides voltage boost theory and circuit operation principle of the ZSI/qZSI. Based on the demanded mutual limitation of the shoot-through duty ratio and modulation index for ZSI/qZSI, the capacitor voltage range of ZSI/qZSI is investigated and a constant capacitor voltage control strategy is presented for ZSI/qZSI based grid-connected PV systems. The proposed control strategy decouples maximum power point tracking (MPPT) (for power flow control) and grid current control (for power quality); simplifies the controller design; realizes closed-loop control for the ZSI/qZSI grid-connected PV system as well as MPPT. Moreover, the proposed control strategy ensures minimum voltage stress on switching devices when with the same input and output voltage level.

Key words： Z-source/quasi-Z-source inverter photovoltaic grid-connected maximum power point tracking constant voltage control shoot-through voltage boost

Received: 09 January 2011 Published: 07 March 2014

PACS:	TM615
	TM464

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	Li Yuan
	Peng Fangzheng

Cite this article:

Li Yuan,Peng Fangzheng. Constant Capacitor Voltage Control Strategy for Z-Source/ Quasi-Z-Source Inverter in Grid-Connected Photovoltaic Systems[J]. Transactions of China Electrotechnical Society, 2011, 26(5): 62-69.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I5/62

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