Converter fault diagnosis method in driving of switched reluctance motor drive and converter

Abstract

The invention provides a converter fault diagnosis method in the driving of a switched reluctance motor drive and a converter. The converter comprises a three-phase converter body circuit, a standby power switching device, and a relay network. The standby power switching device is electrically connected to the three-phase converter body circuit via the relay network. The method comprises controlling the on / off state of the power switching device of the converter by a control signal, adding a preset target signal to the control signal, acquiring the amplitude and frequency of a high-frequency current signal when the power switching device of the converter is in different states, and finally determining the fault type of the converter in the SRM drive system according to the magnitude and frequency of the high-frequency current signal. Therefore, no additional sensors are needed to detect the failure of the power switching device, the complexity of the system is reduced, and the fault type and the fault location of the converter can be determined in real time at high precision and high speed.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a fault diagnosis method for a converter in a switched reluctance motor drive and the converter. Background technique [0002] Switched reluctance motor (Switched Reluctance Motor, SRM) is used in electric vehicle / hybrid drive and other occasions due to its superior fault tolerance and reliable structure. Among them, the converter is the core device in the switched reluctance motor drive system. [0003] However, power switching devices in SRM drive systems are prone to failure under harsh environments and repetitive loads, especially during speed transients and braking. Switching faults of converters can generally be divided into short-circuit faults and open-circuit faults. At present, there are many diagnostic methods for converter switch faults. For example, DC bus current and phase current can be used to detect open circuit and short circuit faults, freewheeling ...

AI Technical Summary

Problems solved by technology

[0004] However, when using the DC bus current and phase current to detect open circuit and short circuit faults, additional sensors need to be added, thus increasing the cost and complexity of the SRM drive system

However, when fuzzy analysis methods such as neural network and Fourier transform are used to analyze switch faults, there is often a problem of poor real-time performance.

Images