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A neutral point voltage-balancing control algorithm is proposed for a neutral-point-clamped (NPC) three-level photovoltaic (PV) grid-connected inverter. The mathematical model of the neutral point current was deduced. The influence on the neutral point voltage for discontinuous pulse width modulation(DPWM) methods was analyzed. Comparison of the error between feedback neutral point voltages and the...
The circuit structure of a Stand-alone PV system based on the super-capacitor energy storage is introduced and the control strategy of bi-directional DC-DC converter is analyzed. The super-capacitor energy storage system based on the fuzzy PI controller is proposed in this paper, the fuzzy PI controller design of the system is discussed, the performance of the system is studied in detail. Finally,...
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