A single-phase photovoltaic grid-connected inverter with low common-mode voltage

Abstract

The invention discloses a single-phase photovoltaic grid-connected inverter with low common-mode voltage. The single-phase photovoltaic grid-connected inverter is formed by a photovoltaic array module, six same switching tubes, two power diodes and two filtering inductors, wherein a drain electrode of a first power switching tube is connected with an anode of the photovoltaic array module; a source electrode of the first power switching tube is connected with the anode of a second power diode; a cathode of a first power diode is connected with the drain electrode of a third power switching tube; the source electrode of the third power switching tube is connected with the cathode of the photovoltaic array module; the drain electrode of a second power switching tube is connected with the anode of the photovoltaic array module; the source electrode of a fourth power switching tube is connected with the cathode of the photovoltaic array module; the cathode of the second power diode is connected with the anode of the first power diode; and a second filtering inductor is connected with a power grid cathode end and the drain electrodes of the switching tubes. According to the single-phase photovoltaic grid-connected inverter disclosed by the invention, common-mode leakage current is effectively inhibited, the current fluctuation is easily reduced, the whole conversion efficiency is improved and the safety of a grid-connected inverter system is improved; and the single-phase photovoltaic grid-connected inverter is relatively simple in circuit structure and is easy to realize.

Description

technical field [0001] The invention relates to a device that uses semiconductor switching tubes and power diodes to convert DC power input into AC power output and can be used in parallel with the power grid, especially a single-phase photovoltaic grid-connected inverter with low common mode voltage. device. Background technique [0002] As we all know, in today's pursuit of a low-carbon society, solar energy, as a clean and renewable energy source, has attracted more and more attention from all countries in the world. Photovoltaic grid-connected power generation is clean and does not pollute the environment. This new energy has attracted more and more attention. In the next 10 years, with the support of new energy policies in various countries, the photovoltaic power generation market will expand rapidly by reducing costs and improving conversion efficiency, and various photovoltaic material markets will also accelerate development. Among them, Europe, the United States a...

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Problems solved by technology

Compared with the former two, the cost of the latter is reduced, the size and weight are reduced, and its efficiency can be improved accordingly, but at the same time, non-isolated photovoltaic inverters are prone to leakage currents and other phenomena, which is not conducive to system security

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