Micro-grid intelligent high-speed switch

Abstract

The invention relates to a micro-grid intelligent high-speed switch which comprises an operating mechanism and a central control unit, wherein the operating mechanism is used for driving a switch to be closed or opened; the central control unit can receive the electric current information of an electric current detecting device, processes and logically analyzes the electric current information and outputs a control instruction after the fault of electric current is judged to control the operating mechanism to close and open the switch; in the processing and logical analysis step, a bran-new mutational volume starting and two-point computing rapid-exit algorithm is adopted so that the whole exit time can be controlled within about 3ms; meanwhile, the operating mechanism is provided with a repulsive force coil and a repulsive force metal disc for rapidly opening and closing the switch so that the time of the whole group of disconnecting actions is shortened within 7ms, thereby the purposes of the rapid action, rapid exit protection and rapid fault clearing are realized in terms of software and hardware; the reliability of a micro-grid in the grid-connected or grid-isolated operation and the smooth transition of the micro-grid in a grid-connected / grid-isolated mode are powerfully ensured; and the equipment cost is obviously reduced under the condition that the special operating requirement of the micro-grid is satisfied.

Description

technical field [0001] The invention relates to a micro-grid PCC intelligent complete set of equipment, which is mainly used in the connection between the micro-grid and the large power grid. It is the key equipment for the connection between the micro-grid and the large power grid. equipment. Background technique [0002] The microgrid has two steady-state operation modes: grid-connected and isolated. The grid-connected mode means that under normal circumstances, the microgrid is connected to the large grid, and the two operate simultaneously. The microgrid provides excess power to the large grid or is supplied by the large grid Supplement the insufficient power generation of the microgrid; isolated grid operation means that when the large grid fails or the power quality cannot meet the requirements of the microgrid, the microgrid is disconnected from the large grid and runs independently. It can be seen that the isolated grid operation of the microgrid can provide more pow...

AI Technical Summary

Problems solved by technology

However, since each circuit breaker in the prior art usually uses Fourier transform or its variants to calculate the fault current, this calculation method requires a complete cycle sampling to accurately calculate the magnitude of the fault current. For a 50Hz AC, a fundamental cycle It is 20ms, so the fastest disconnection action time is also greater than 20ms, and the disconnection action time of the whole group can reach more than 50ms, which cannot meet the needs of the working mode switching of the microgrid in terms of timeliness

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