High-power solar three-phase grid-connected inverter

Abstract

The invention relates to the field of solar power generation, in particular to a high-power solar three-phase grid-connected inverter. The technical scheme for implementation of the inverter includes that the high-power solar three-phase grid-connected inverter comprises a case, an electrical cabinet, an operation transformer, an anode copper bar, a cathode copper bar, a first contactor, a first current sensor, an inversion module, an electric reactor, a three-phase capacitor, a second current sensor, a filter, a second contactor and a circuit breaker. The inversion module comprises at least one power module group, each power module group comprises three power modules, and each power module is used for realizing current conversion of one phase and provided with an independent laminated busbar. The high-power solar three-phase grid-connected inverter requires low power of a radiation fan and has better radiation effects.

Description

technical field [0001] The invention relates to the field of solar power generation, in particular to a high-power solar three-phase grid-connected inverter. Background technique [0002] The inverter equipment in the prior art, such as a 500kw solar three-phase grid-connected inverter, generally includes two 250kw power modules, and each power module includes a laminated busbar equipped with three phase power switching devices And the heat sink, the heat caused by the switching loss of the three phases is dissipated through the same heat sink and the same air-cooled air duct. The excessive concentration of heat and the formation of the air duct are too long, resulting in low heat dissipation efficiency and poor effect of each power module group. In order to enable the power switching device to work in a reasonable temperature range, the prior art often uses a high-power heat dissipation fan to compensate for the increase in operating temperature caused by low heat dissipati...

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Problems solved by technology

[0005] The power cabinets disclosed in the above two patents are generally composed of a plurality of stacked power modules, and each power module realizes the three-phase conversion of A, B, and C, and includes several power modules for realizing the three-phase conversion. Power switching devices, a laminated busbar, a radiator and several capacitors. In this system, the ABC three-phase conversion will be output through the same laminated busbar, and the heat loss generated by the conversion will be passed through The same radiator emits heat. Therefore, the entire power module uses the same air duct and the same radiator to dissipate heat. Therefore, this air-cooled form generally has a longitudinal and long wind range, and a large-power exhaust fan is required, so that High energy consumption

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