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论文类型：会议论文

发表时间：2017-01-01

收录刊物：CPCI-S

卷号：2017-January

页面范围：1347-1352

关键字：Electric traction PWM rectifier; inductance estimation; control system stability; dual-frequency harmonic current injection; fast Fourier transform

摘要：Due to the nonstationary characteristic of the electric locomotives in electric traction systems, the equivalent grid impedance changes frequently, which may lead to detrimental effect on the control system of electric traction PWM rectifiers. The mathematical model of an electric traction PWM rectifier is established, and the double-loop control system is designed. An online grid inductance estimation method for the electric traction PWM rectifier based on dual-frequency harmonic current injection is accordingly proposed. 400Hz and 500Hz are selected as the frequencies of the harmonics injected into the system. Moving window fast Fourier transform (FFT) is performed to extract the amplitudes corresponding to the harmonics. The estimation values of the grid inductance can be obtained from a series of arithmetical operations. The experimental platform for the electric traction PWM rectifier is set up. Simulation and experimental results are demonstrated to verify the effectiveness of the proposed strategy.