Micro-grid operating inverter grid-connection and off-grid smooth switching circuit and control method thereof

A technology of smooth switching and control methods, which is applied in the direction of AC network circuits, circuit devices, single-network parallel feeding arrangements, etc., can solve the problems of easy damage, safety and low reliability of inverters, and achieve non-destructive safety, The effect of high reliability and overcoming low reliability

Inactive Publication Date: 2014-04-30
XINJIANG HOPE ELECTRONICS
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  • Claims
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Problems solved by technology

[0005] In the process of realizing the present invention, the inventor found that there are at least defects in the prior art such as low reliability, easy damage to the inverter, and poor safety

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  • Micro-grid operating inverter grid-connection and off-grid smooth switching circuit and control method thereof

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[0032] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0033] According to the technical solution of the present invention, a grid-connected and off-grid smooth switching circuit and a control method thereof for an inverter operating in a micro-grid are provided. The grid-connected and off-grid smooth switching circuit and control method of the micro-grid running inverter can realize the smooth switching process between grid-connected and off-grid, and will not cause large damage to the micro-grid running inverter Current impact; moreover, the three-phase solid-state relay grid-connected time is very short, only a small radiator is needed, and the main contact of the three-phase AC contactor is continuously connected to ...

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Abstract

The invention discloses a micro-grid operating inverter grid-connection and off-grid smooth switching circuit and a control method of the micro-grid operating inverter grid-connection and off-grid smooth switching circuit. The micro-grid operating inverter grid-connection and off-grid smooth switching circuit comprises a micro-grid operating inverter, a three-phase grid and a local alternating-current load, wherein the three-phase grid and the local alternating-current load are connected with the micro-grid operating inverter. The micro-grid operating inverter grid-connection and off-grid smooth switching circuit and the control method of the micro-grid operating inverter grid-connection and off-grid smooth switching circuit overcome the defects that the reliability is low, the inverter can be damaged easily and the safety performance is poor in the prior art and have the advantages that the reliability is high, the inverter is not prone to damage, and the safety performance is good.

Description

technical field [0001] The invention relates to the technical field of smart microgrid system application, in particular to a grid-connected and off-grid smooth switching circuit and a control method for a microgrid operating inverter. Background technique [0002] The continuous development of new energy power generation systems such as photovoltaic power generation and wind power generation has accelerated the pace of construction of smart micro-grid systems. As a part of smart micro-grid systems, inverters for micro-grid operations have received increasing attention. The micro-grid operation inverter can work in both the grid-connected mode and the off-grid mode. According to the grid failure and recovery situation or system scheduling instructions, the two modes can be switched freely and automatically smoothly. [0003] Existing systems usually only use three-phase solid state relays or three-phase AC contactors for grid-connected or off-grid operations. For only three-...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38
CPCY02P80/14
Inventor 戴伟陈芳牟长洲李科
Owner XINJIANG HOPE ELECTRONICS
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