An auxiliary power supply circuit

Abstract

This application provides an auxiliary power supply circuit, which is applied to a grid-connected power generation system. The grid-connected power generation system includes at least two power generation subsystems, a grid-connected inverter, and the grid-connected inverter and each power generation subsystem. one-to-one correspondence and provide the auxiliary power supply for working electricity for the grid-connected inverter and the power generation subsystem; wherein, the output end of each power generation subsystem is respectively connected to the DC bus of the system through an anti-reverse diode; each auxiliary power supply The input terminals are all connected to the system DC bus, and the auxiliary power supply and the DC bus form the auxiliary power supply circuit for the grid-connected power generation system. The present invention changes the traditional method of obtaining auxiliary power from the output ends of each power generation subsystem or directly obtains the auxiliary power of grid-connected inverters from the grid, and adopts the method of uniformly obtaining power from the DC bus for the auxiliary power to ensure that each power generation The system and the grid-connected inverter are in working or standby state, which improves the response speed of the system and the reliability of power supply.

Description

technical field [0001] The invention relates to the technical field of distributed power generation, in particular to an auxiliary power supply circuit. Background technique [0002] Distributed power generation refers to power generation equipment that is directly arranged on the distribution network or distributed near the load. Distributed power generation is economical, efficient and reliable, which helps to promote the sustainable development of energy, improve the environment and enhance the competitiveness of green energy. [0003] Existing distributed power generation grid-connected systems have switching power supplies for auxiliary power supply, which are used to provide operating voltages for circuits such as single-chip microcomputer control circuits and switch tube drive circuits. Since the distributed generation grid-connected system has several distributed power generation sub-systems, and each power generation sub-system corresponds to a control circuit, the ...

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Problems solved by technology

[0005] 1. When the electric energy provided by a certain power generation subsystem is not enough to supply power for its auxiliary power supply, the power generation subsystem will be in a shutdown state; in addition, when the power grid fails, the grid-connected inverter will be in a shutdown state, so , resulting in lower power supply reliability of the entire distributed generation grid-connected system

[0006] 2. It cannot ensure that each power generation subsystem and grid-connected inverter are in working or standby state to the greatest extent, resulting in slow recovery of the system and reduced response sensitivity

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