Device for avoiding frequent start stop of photovoltaic inverter and photovoltaic inverter

Abstract

The invention is suitable for the technical field of design of photovoltaic inverters, and provides a device for avoiding frequent start stop of a photovoltaic inverter and the photovoltaic inverter. The device comprises a power absorption unit which is connected in parallel between a photovoltaic direct current (dc) positive busbar and a photovoltaic dc negative busbar and is connected with an auxiliary power supply of the photovoltaic inverter, and the power absorption unit is used for using a transistor to absorb power output by a solar cell panel through the photovoltaic dc busbar before the auxiliary power supply is started, and for stopping absorbing the power output by a solar cell panel through the photovoltaic dc busbar after the auxiliary power supply is started. Compared with the existing mode of power absorption by using power resistors, the invention has the advantages of reducing the occupied area of a printed circuit board, reducing the space occupied by the integral photovoltaic inverter, obviously improving the power density and reducing the cost of the photovoltaic inverter.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic inverter design, and in particular relates to a device for avoiding frequent start and stop of photovoltaic inverters and a photovoltaic inverter. Background technique [0002] Photovoltaic inverter is a device used in photovoltaic solar power generation system to convert the direct current output by the photovoltaic controller or battery in the photovoltaic solar power generation system into alternating current and output it to the AC load. It is one of the core equipment of the photovoltaic solar power generation system , the quality of its performance plays a key role in realizing the conversion of solar energy and electric energy. [0003] A photovoltaic inverter generally includes an inverter switch circuit, a controller, and an auxiliary power supply that mainly supplies power to the controller. Among them, when the auxiliary power supply is powered by the photovoltaic DC bus in the ph...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a device for avoiding the frequent start and stop of the photovoltaic inverter, aiming at solving the problem that the device for avoiding the frequent start and stop of the photovoltaic inverter provided by the prior art uses power resistors to absorb power, and the required high-power resistors are many , occupies a large area of ​​the printed circuit board, increases the space of the photovoltaic inverter, reduces the power density, and increases the cost of the photovoltaic inverter

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