Photovoltaic power generation single phase grid-connected inverter

Abstract

The invention discloses a photovoltaic power generation single phase grid-connected inverter, comprising an inverter circuit, a filter circuit, a digital signal processor (DSP) main control unit, a signal detection unit, a protection circuit, a power frequency isolation transformer, an inversion drive circuit, an auxiliary power supply circuit, a man-machine interaction module, and a parallel operation communication interface. The inverter circuit is of a single-phase whole bridge structure, the direct current is sent to the power frequency isolation transformer for the isolation and the boosting after being subject to the inversion and the filtration. The signal detection unit samples the direct current voltage, the current and alternating current side grid-connected current and the grid voltage signal, which are processed by the DSP main control unit to generate a space vector pulse width modulation (SVPWM) signal, the SVPWM signal drives the inverter circuit to work through the inversion drive circuit, and the protection circuit can blockade protection of the inversion drive circuit to the grid-connected inverter. The grid-connected inverter of the invention has the advantage of stable voltage output, the direct current voltage efficiency of the solar battery can reach more than 95%, and the power generation factor is higher than 0.95.

Description

technical field [0001] The invention relates to a photovoltaic power generation device, in particular to a photovoltaic power generation single-phase grid-connected inverter, which belongs to the technical field of photovoltaic power generation equipment. Background technique [0002] At present, the contradiction between the traditional petrochemical energy consumption mode and economic development and environmental protection is becoming more and more prominent. People have gradually realized that human beings must take the road of sustainable development and vigorously develop and utilize renewable energy. In the family of renewable energy, the resource with the largest amount and the most widespread distribution is solar energy. Photovoltaic power generation technology is the use of solar cells to effectively absorb sunlight and convert it into electricity. The grid-connected inverter is the key link and important equipment in the photovoltaic power generation grid-con...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a photovoltaic power generation single-phase grid-connected inverter, used in conjunction with solar cells, with stable output voltage and pure power wave, to solve the technical problem of low DC voltage utilization in the prior art

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