Large-power photovoltaic gird-connected inverter

Abstract

The invention discloses a large-power photovoltaic gird-connected inverter. The inverter comprises a direct current filter circuit, a boosting circuit and a full-bridge inversion circuit which are electrically connected in sequence; direct current is input to the input end of the direct current filter circuit; a second capacitor is connected between the boosting circuit and the full-bridge inversion circuit in parallel; the inverter further comprises a breaker and a protective function circuit; the output end of the breaker is connected with an alternating current power grid. By the mode, the inverter enables the solar radiation energy received by a photovoltaic assembly to become high-voltage direct current after high-frequency direct current conversion, sine alternating current with the frequency and phase same as those of the power grid voltage is outputted after the inverting conversion of the inverter and the work efficiency is higher.

Description

technical field [0001] The invention relates to a high-power photovoltaic grid-connected inverter. Background technique [0002] With the development of solar energy application technology, the mainstream development trend of photovoltaic power generation system will undoubtedly be grid-connected photovoltaic power generation. As one of the key devices of the photovoltaic grid-connected power generation system, the operating performance of the grid-connected inverter directly affects the safe, reliable and efficient operation of the photovoltaic grid-connected power generation system. [0003] Since last year, my country's domestic market has gradually started, and the government has increased policy support, and the demand for domestic photovoltaic grid-connected inverters has increased significantly. At present, domestic inverter manufacturers with relatively large production scale include Hefei Sunshine, Megavolt Aesuo, Wuxi Samil, Greenwatt, Chint Power, Guanya Power, A...

AI Technical Summary

Problems solved by technology

[0004] From a technical point of view, my country's photovoltaic inverter terminal market started relatively late, and domestic enterprises still have a gap with foreign advanced levels in terms of conversion efficiency, structure technology, and stability. At present, my country's low-power inverter technology is basically in the same position as foreign countries. The same level, but still needs further improvement and development in high-power grid-connected inverters

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