Split-phase output fast switching circuit and surge current suppression control method adopted by same

Abstract

The invention relates to a split-phase output fast switching circuit and a surge current suppression control method adopted by the same. The split-phase output fast switching circuit comprises an inverter, a grid-connected switch array, a power grid, a bypass switch array, a load, an autotransformer and an off-grid and transformer synchronous switch array, wherein an input side of the grid-connected switch array is connected with the inverter, the power grid is connected with an output side of the grid-connected switch array, the bypass switch array is connected with an output side of the grid-connected switch array, the off-grid and transformer synchronous switch array is connected with the inverter, a first output side of the off-grid and transformer synchronous switch array and an output side of the bypass switch array are jointly connected with the load, and a second output side of the off-grid and transformer synchronous switch array is connected with the autotransformer. The surge current suppression control method adopted by the split-phase output fast switching circuit comprises the step of controlling each switch array and controlling the off-grid output voltage of the inverter. According to the split-phase output fast switching circuit and the surge current suppression control method, the reliability of the system can be improved, and fast switching between grid connection and off-grid and uninterrupted power supply of the load can be realized.

Description

technical field [0001] The invention belongs to the technical field of power electronic inverters, and specifically relates to an inverter using an autotransformer to realize off-grid split-phase output, and a switch array to realize a split-phase output fast switching circuit for fast switching between grid-connected and off-grid, and the The control method for suppressing the inrush current adopted by the split-phase output fast switching circuit. Background technique [0002] In some countries and regions, there is a 240 / 120V single-phase three-wire system in the power grid, that is, two live wires L1, L2, and one neutral wire N, called the Split Phase grid, where the photovoltaic energy storage hybrid inverter can realize grid-connected and off-grid There are two working modes of the network. Grid-connected work only needs to output the current of two live wires, L1 and L2, and realize the unbalanced current of L1N and L2N through the transformer at the grid end. Howev...

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Problems solved by technology

[0005] 1. The switch is not synchronized, and the abnormal switch failure leads to abnormal output voltage, damage to the load or shortened service life;

[0006] 2. On-grid and off-grid switching time prolongs, and the load will be powered off;

[0007] 3. Autotransformer surge current problem at the moment of switch closing

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