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In this paper, a new topology of the 5‐level neutral‐point‐clamped dual quasi‐Z‐source inverter is proposed, which can effectively inhibit the start current of the inductor of Z‐source network and improve the boost capability of the DC side of inverter in contrast to traditional 5‐level neutral‐point‐clamped dual Z‐source inverter. Furthermore, the mathematical model of the quasi‐Z‐source network and the transient analysis are deduced by using the state space method and small signal model respectively. Meanwhile, a method based on sliding mode control for improving the new topology transient response is also presented. The method does not require linearization, and the corresponding control law is obtained by selecting appropriate state variables. Finally, the simulation and experiments verify the superiority and effectiveness of sliding mode control.
Tao Li; Qiming Cheng. Structure analysis and sliding mode control of new dual quasi-Z-source inverter in microgrid. International Transactions on Electrical Energy Systems 2018, 29, e2662 .
AMA StyleTao Li, Qiming Cheng. Structure analysis and sliding mode control of new dual quasi-Z-source inverter in microgrid. International Transactions on Electrical Energy Systems. 2018; 29 (1):e2662.
Chicago/Turabian StyleTao Li; Qiming Cheng. 2018. "Structure analysis and sliding mode control of new dual quasi-Z-source inverter in microgrid." International Transactions on Electrical Energy Systems 29, no. 1: e2662.
At present, the research on five-level inverters mainly involves the modulation algorithm and topology, and few articles study the five-level inverter from the control strategy. In this paper, the nonlinear passivity-based control (PBC) method is proposed for single-phase uninterruptible power supply inverters. The proposed PBC method is based on an energy shaping and damping injection idea, which is performed to regulate the energy flow of an inverter to a desired level and to assure global asymptotic stability, respectively. Furthermore, this paper presents a control algorithm based on the theory of passivity that gives an inverter in a photovoltaic system additional functions: power factor correction, harmonic currents compensation, and the ability to stabilize the system under varying injection damping. Finally, the effectiveness of the PBC method in terms of both stability and harmonic distortion is verified by the simulation and experiments under resistive and inductive loads.
Tao Li; Qiming Cheng; Weisha Sun; Lu Chen. Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model. Energies 2017, 10, 1657 .
AMA StyleTao Li, Qiming Cheng, Weisha Sun, Lu Chen. Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model. Energies. 2017; 10 (10):1657.
Chicago/Turabian StyleTao Li; Qiming Cheng; Weisha Sun; Lu Chen. 2017. "Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model." Energies 10, no. 10: 1657.