After analyzed the running mode of city light rail vehicles, the author expounds the necessity of using energystorage regeneration braking system. Then this paper puts forward a new regeneration braking system using Ultracapacitor as energy storage element. The system uses bidirectional converter between Ultra-capacitor and traction inverter DC link, to make sure that capacitor can store the energy produced by regeneration braking system when the general regeneration braking can not be achieved, and provide energy to traction inverter DC link when vehicle is working in the traction condition. In this case, it can ensure that light rail can realize the regenerative braking in the conventional braking, and the light rail vehicle reduces the energy consumption obviously.

EMU (electric multiple unit) traction motors are powered by converters whose output voltage increases the voltage stress borne by the insulation system, making the ITSC (inter-turn short-circuit) fault more prominent. An index based on short-circuit thermal power is proposed in the article to evaluate the non-metallic ITSC faults extent. The apFFT (all-phase FFT) time-shift phase difference correction with double Hanning windows is used to calculate fault features to train the SVM (support vector machine) fault diagnosis model whose hyper-parameters C and g are optimized using grid search methods. The experimental verification was carried out on the EMU electric traction simulation experimental platform. According to the fault extent index proposed in this article, the experimental samples were divided into three categories, normal, incipient and serious fault samples. The ITSC fault diagnosis accuracy was 100% on the training dataset and 93.33% on the test dataset. There was no misclassification between normal and serious ITSC fault samples.

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