Power electronic equipment failure self-healing method

Abstract

The invention discloses a power electronic equipment failure self-healing method which comprises power device series circuit failure self-healing and power device parallel circuit failure self-healing. According to the power device series circuit failure self-healing, a fault power device is isolated by breakover of a bypass conducting channel. According to the power device parallel circuit failure self-healing, when a power device in a power device parallel circuit breaks down, circuit breakers connected in parallel are all disconnected, and a fault is isolated and operations are stopped. Thus, chain reaction of a secondary fault is avoided, safe operation of the power electronic equipment is guaranteed, and an unpredictable sudden accident can be converted to a foreseeable planned maintenance work.

Description

technical field [0001] The invention belongs to the technical field of power equipment safety protection, and relates to a power electronic equipment fault self-healing method for preventing secondary failures of power electronic equipment and ensuring reliable operation thereof. Background technique [0002] Power electronic equipment is equipment with power electronic devices as the main functional components, including converter valves, electronic switches and electronic AC power controllers. It is an indispensable and important equipment for power grid operation, and each piece of equipment is a huge system. The number of power devices in power electronic equipment is extremely large. For example, the converter valve, which is the core equipment of the DC power transmission project, obtains the desired DC voltage and realizes power control by sequentially connecting the three-phase AC voltage to the DC terminal. 22-25%. The converter valve is composed of a large number...

AI Technical Summary

Problems solved by technology

At present, although the power system adopts redundant design and performs voltage equalization processing in the process of station construction, a power device string is usually composed of dozens of power devices connected in series. If a power device fails during operation, it will cause The entire power device string stops working, and the system voltage is borne by other power devices, and the design redundancy is often only 2-3%. In this case, it will inevitably lead to large-area overload of the power device. It will cause the whole set of equipment to fail to work, or even cause multiple devices to be damaged at the same time, which not only brings a huge maintenance workload and long-term power outage, but also incalculable economic losses for power companies

So far, this problem has not been well resolved