Power cabinet of inverter

Abstract

The invention provides a power cabinet of an inverter. The power cabinet comprises a cabinet body and a power device arranged in the cabinet body. The cabinet body comprises a low security installation cavity and a high security installation cavity, which are sealed and separated. The power device comprises a high security grade power device arranged in the low security installation cavity and a low security grade power device arranged in the high security installation cavity. The low security installation cavity has an outer cold wind inlet and an inner cold wind outlet which communicate with the outside. A first draught fan is arranged in the low security installation cavity. The power cabinet also comprises a heat exchanger used for dissipating heat of the high security installation cavity. According to the invention, a forced cold wind duct is formed in the low security installation cavity; external cold wind enters the low security installation cavity to carry out heat dissipation; sealed type heat dissipation is achieved for the low security grade power device in the high security installation cavity through the heat exchanger, so damage to the low security grade power device caused by polluted cold wind is avoided; the whole security grade of the inverter is improved; and the service lifetime of the inverter is prolonged.

Description

Technical field [0001] The invention relates to the technical field of electrical equipment, and more specifically, to an inverter power cabinet. Background technique [0002] Photovoltaic grid-connected inverters are used as the interface equipment between the solar power generation system and the grid, and their heat dissipation performance has a greater impact on the stability of the entire inverter system, the service life of power devices, and the volume of the product. The internal components of the inverter include high-protection power devices such as reactors, resistors and radiators, as well as low-protection power devices such as inverter modules, capacitor components, DC MCB components, AC capacitors, AC circuit breakers, and AC contactors . [0003] Considering the power loss characteristics and economy of high-power grid-connected inverters, the heat dissipation method of high-power grid-connected inverters mostly adopts forced air cooling, that is, all components in...

AI Technical Summary

Problems solved by technology

[0004] The heat dissipation medium of the above-mentioned forced air-cooled heat dissipation is external room temperature air. When the inverter is in a harsh environment, the external cold air blows into the inverter, and the polluted cold air is more likely to damage the components inside the inverter, especially Some components with lower protection levels, such as circuit boards, cause damage, which reduces the overall protection level of the inverter and affects the life of the inverter.

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