Automatic transfer switch electric appliance control method and automatic transfer switch electric appliance

Abstract

The invention discloses a method for controlling an automatic transfer switch electrical appliance. The automatic transfer switch electrical appliance includes an automatic transfer switch using a mechanical transfer switch and a power electronic device connected in parallel with the automatic transfer switch, and the power electronic device includes a rectifier module and a power module for power switching in the automatic transfer switch In the process of providing short-term electric energy for the load; in the process of power switching by the automatic transfer switch, the following circulation suppression control is performed on the power electronic device: starting from the physical opening moment of the mechanical transfer switch, the The sum of the phase currents output by the power module of the power electronic device is 0 as the control target to control the power electronic device until the output current through the mechanical transfer switch is 0. The invention also discloses an automatic transfer switch appliance. The invention can effectively suppress the circulating current, thereby realizing the design optimization of the power electronic device.

Description

technical field [0001] The present invention relates to an automatic transfer switching equipment (ATSE). Background technique [0002] Automatic transfer switching equipment (ATSE) is mainly used in emergency power supply systems to monitor power circuits and transfer one or several load circuits from one power source to another. During the conversion process, an arc will be generated when the mechanical contacts are separated, and the existence of the arc makes the circuit remain in the conducting state even if the mechanical contacts are separated. If the arc is not extinguished in time, it may cause a short circuit failure of the two power supplies. In order to improve reliability, in addition to designing a conventional arc extinguishing chamber, ATSE also needs to control the switching speed of the switch not to be too fast. The switching time is usually designed to be 30ms or longer, which results in a longer power-off time for the load during the switching process. ...

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Problems solved by technology

[0005] In order to reduce the size and cost, the automatic transfer switching device proposed in this patent adopts a non-isolated circuit topology, and forms a circulation loop through the rectifier bridge, power module and switch. Increased burden, once the circulation is too large, it is easy to cause faults such as overcurrent and overheating of the module, forming a safety hazard and reducing efficiency

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