Single-phase voltage boosting-reducing type photovoltaic inverter capable of inhibiting current leakage and control method thereof

Abstract

The invention discloses a single-phase voltage boosting-reducing type photovoltaic inverter capable of inhibiting leakage current and a control method thereof. The inverter consists of six switch tubes, two diodes, one DC inductor, two filtering inductors with identical inductance values and a filtering capacitor. The single-phase voltage boosting-reducing type photovoltaic inverter has functions of boosting voltage and reducing voltage and has a wide input voltage range; the four power switches of the bridge arms of the inverter are in a power frequency state and only two power switches are working at a high frequency; the switch loss is small, a dead area does not need to be set for driving pulse, and circuit reliability is high. The single-phase voltage boosting-reducing type photovoltaic inverter capable of inhibiting leakage current and the control method thereof enable voltage on two ends of a parasite capacitor to ground of the photovoltaic system does not contain high frequency components, and enable current leakage to be effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a single-phase buck-boost photovoltaic inverter capable of suppressing leakage current and a control method thereof, which are suitable for single-phase inverter applications. Background technique [0002] Energy is the material basis for the survival and development of human beings. The limited and extensive exploitation and utilization of fossil energy have led to the increasingly serious problem of energy shortage, and at the same time caused the deterioration of environmental problems. Solar energy is currently one of the cleanest and most promising renewable energy sources for large-scale development and utilization, and its photovoltaic utilization has attracted widespread attention from all over the world. Solar photovoltaic power generation is the main development trend of solar photovoltaic utilization, and it will develop more and more rapidly in t...

AI Technical Summary

Problems solved by technology

Leakage current will not only cause EMI problems, but also reduce the quality of grid-connected current, and bring safety hazards to personnel safety. Therefore, in transformerless grid-connected inverters, the problem of leakage current must be solved

[0005] In transformerless inverters, some inverter topologies have solved the problem of constant common-mode voltage, but at the same time there are other problems, such as complex circuit structure, no buck-boost function, and many switches working at high frequency. Large switching loss and other issues

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