Flying capacitor five-level inverter, phase shift control method and new energy power generation system

Abstract

The invention discloses a flying capacitor five-level inverter, a phase shift control method and a new energy power generation system. The flying capacitor five-level inverter comprises 16 high frequency MOSFET tubes and 6 flying capacitors, wherein the 16 high frequency MOSFET tubes are uniformly divided into two groups, and 8 high frequency MOSFET tubes of each group are connected in series through source electrodes and drain electrodes to form a bridge arm, a Pa1 node, a Pa2 node, a Pa3 node, an A node, an Na3 node, an Na2 node and an Na1 node are formed in the first bridge arm, a Pb1 node, a Pb2 node, a Pb3 node, a D node, an Nb3 node, an Nb2 node and an Nb1 node are formed in the second bridge arm, the flying capacitors are respectively connected between the Pa1 node and the Na1 node, between the Pa2 node and the Na2 node, between the Pa3 node and the Na3 node, between the Pb1 node and the Nb1 node, between the Pb2 node and the Nb2 node and between the Pb3 node and the Nb3 node, the A node and the D node form an output end of the flying capacitor five-level inverter, and the output end is connected with a power grid. The flying capacitor five-level inverter is advantaged in that performance and efficiency are further improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a flying capacitor five-level inverter, a phase-shift control method adopted therefor, and a new energy power generation system based on it, which can be applied to new energy power generation industries such as solar power generation and wind power generation . Background technique [0002] Due to the limitation of conventional energy sources and the increasingly prominent environmental problems, new energy sources characterized by environmental protection and renewable energy have been paid more and more attention by various countries. As an interface between new energy and the grid or load, the performance of the inverter directly affects the performance of the new energy power generation system. In terms of output levels, inverters can generally be divided into two-level inverters and multi-level inverters. [0003] At present, the structures of single-phase photovo...

AI Technical Summary

Problems solved by technology

In the utility model patent "flying capacitor five-level photovoltaic inverter" with the application number 201120262122.X, a flying capacitor five-level photovoltaic inverter is disclosed. Each phase is composed of 8 power electronics Composed of switching tubes and 5 clamping capacitors, the inverter outputs five levels per phase bridge arm, which improves the power generation efficiency of the entire solar power generation system. The harmonics injected into the grid are small, but there is still room for improvement in terms of performance and efficiency.

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