Interturn Short-Circuit Fault Diagnosis of PMSM for Small Hydropower

There is a growing interest in small hydropower clean energy, and PMSM is the decisive service equipment in hydropower system, it is vital to ensure the stable and efficient operation of PMSM. However, there exist complex operating conditions make fault diagnosis difficult. Thus, in this paper, a diagnosis method for interturn short-circuit of PMSM for small hydropower is proposed. By analyzing the fault component, this method uses Extended State Observer (ESO) to estimate the fault signature of PMSM with interturn short-circuit. Then, the frequency tracking algorithm calculates the amplitude of faults signature and sets it as fault indicator. The method can be easily implemented in hydropower control system. Simulation results show the effectiveness of the proposed method.