A static switch and control method applied to the connection between microgrid and public grid

Abstract

The invention discloses a static switch and a control method applied to a connection of a microgrid and a public supply network. The static switch and the control method applied to the connection of the microgrid and the public supply network are characterized by comprising a main circuit and a controller, wherein the main circuit is placed between the public supply network and the microgrid, the controller controls the main circuit to turn on and turn off, and on-grid and off-grid of the microgrid are achieved through the power on and power off of the main circuit. Voltage, frequency and phase position of the public supply network and the microgrid and currents flowing past a bypass circuit are sampled by the controller to acquire a sampling signal, the power on or power off of the instruct main circuit are judged to achieve the on-grid and off-grid of the microgrid through calculation. According to the static switch and the control method applied to the connection of the microgrid and the public supply network, full automatic control on the smooth on-grid and off-grid of the microgrid is achieved, a micro source inverter of the microgrid can be monitored and controlled by the controller, and the purpose of energy management of the microgrid or assisting an upper level device to achieve energy management of the microgrid is achieved.

Description

technical field [0001] The invention relates to a static switch and its control method applied to the connection between microgrid and public grid, in particular to a controllable three-phase AC path electronic switch and its bypass circuit controlled by an ARM chip, and an automatic switch related to the operation mode of the microgrid. Control Method. Background technique [0002] Micro-grid is the latest topic of domestic and foreign power grid research. It can vigorously promote the grid connection of distributed power sources based on renewable energy, effectively improve the capacity of traditional power grids, and reduce greenhouse gas emissions; the connection between micro-grids and large power grids Static switches are important components for automatic, smooth and fast transitions between grid-connected and off-grid modes in microgrids. [0003] There are three main reasons for using a static switch to connect and disconnect a microgrid from the public grid: Firs...

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Problems solved by technology

[0003] There are three main reasons for using a static switch to connect and disconnect a microgrid from the public grid: First, using a static switch to realize the transient process of connecting or disconnecting a microgrid does not use a mechanical action part, so it is different from using a mechanical action part to realize a microgrid. Compared with the off-grid traditional switch, the service life of the grid-connected grid is greatly extended; secondly, when it is reconnected to the grid, a series of complicated synchronization checks need to be done, so a dedicated switch is required; To disconnect the public grid, but the complete static switch needs to be reconnected to the public grid at an appropriate time, and can not cause serious electromagnetic transient interference to the micro grid; third, the static switch can realize the grid connection of the micro grid In addition to off-grid control, it is also necessary to be able to monitor and control the micro-power inverter inside the micro-grid, realize the energy management of the micro-grid or assist the upper-layer equipment to realize the energy management of the micro-grid, but there is no complete The static switch can be used in the actual microgrid system

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