GRID-CONNECTED MODULATION TECHNOLOGY OF PHOTOVOLTAIC QUASI-Z-SOURCE H-BRIDGE CASCADED MULTI-LEVEL INVERTER

孟志强; 邵武; 唐杰; 尹进田

doi:10.19912/j.0254-0096.tynxb.2021-0544

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (11) : 50-59. DOI: 10.19912/j.0254-0096.tynxb.2021-0544

GRID-CONNECTED MODULATION TECHNOLOGY OF PHOTOVOLTAIC QUASI-Z-SOURCE H-BRIDGE CASCADED MULTI-LEVEL INVERTER

Meng Zhiqiang¹, Shao Wu¹, Tang Jie², Yin Jintian²

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Abstract

The technical guidelines for grid-connected photovoltaic power generation require grid-connected inverters to achieve high power factor, and also set clear requirements for the total harmonic distortion （THD） of the grid-connected current. At present, the above goals are mainly achieved by modulating the grid-connected current of photovoltaic grid-connected inverters. Aiming at the operating characteristics of the photovoltaic quasi-Z source inverter, based on the working principle of the inverter's two-state hysteresis current control, a three-state hysteresis controller and single-phase quasi-loop controller that can make the inverter pass through to achieve photovoltaic MPPT are proposed. The three-state hysteresis control system of the Z-source cascaded inverter is analyzed. The working principle of the three-state hysteresis controller is analyzed, and the three-unit quasi-Z-source cascaded inverter system is used to simulate the three-state hysteresis control and carrier wave. The control effect of the stacking method and the carrier phase shifting method. The simulation results show that the three-state hysteresis control modulation strategy exhibits better steady-state and dynamic response performance, and its grid-connected current harmonic distortion rate is smaller.

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photovoltaic power generation / inverters / hysteresis control / cascaded H bridge / quasi-Z source

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Meng Zhiqiang, Shao Wu, Tang, Jie, Yin Jintian. GRID-CONNECTED MODULATION TECHNOLOGY OF PHOTOVOLTAIC QUASI-Z-SOURCE H-BRIDGE CASCADED MULTI-LEVEL INVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(11): 50-59 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0544

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