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| Passivity-Based Control Strategy of Quasi Z-Source Three-Level Grid-Connected Inverter |
| Cheng Qiming1, Jiang Chang1, Shen Lei1, Cheng Yinman2 |
1. Shanghai Key Laboratory Power Station Automation Technology Laboratory Shanghai University of Electric Power Shanghai 200090 China;
2. North Power Supply Branch Shanghai Electric Power Company Shanghai 200041 China |
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Abstract In this paper, passivity-based control (PBC) is introduced into a new quasi-Z source three-level grid-connected inverter. This method can achieve good grid-connected control without linearizing the inverter system. Firstly, the working principle of the new inverter topology is discussed, the overall mathematical model of the new inverter is derived, and the passive Euler-Lagrange (EL) equation form is given. Then, it is verified that the inverter system has strict passive characteristics. By adopting the appropriate damping injection and control rate, the inverter system is accelerated to reach the desired point, the PBC law of decoupling grid-connected current is obtained, and the PBC system of the new inverter is designed. This system can drive the switch action of the new inverter in combination with SPWM modulation algorithm. Finally, the results on the Matlab/Simulink software platform and hardware platform show that the PBC strategy based on EL model has good dynamic characteristics and strong robustness.
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Received: 08 September 2019
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2020, Vol. 35 
