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This paper discusses transient fault current characteristics of photovoltaic system with the help of photovoltaic power system simulation model built in the PSCAD/EMTDC. Then analyze the characteristics and problems of typically existing relay protection configuration scheme for photovoltaic power station and its outgoing lines, and puts forward corresponding improvement measures.
Aiming at the single-phase current five-level inverter, the thesis analyzes the reasons for unbalanced inductor current, introduces some types of present strategies for balancing the inductor current through current sharing, and points out separately the current sharing principles for these strategies, comparing their advantages and shortcomings and then puts forward a new strategy for hysteresis...
This paper analyzed the neutral-point balancing problem of the neutral-point-clamped (NPC) three-level space voltage vector pulse-width modulation (SVPWM) inverter and the influence of each vector to the neutral-point voltage. Based on the normal control strategies to solve the neutral-point balancing problem, including the open-circuit passive control strategy, the hysteresis-band control strategy,...
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