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| DC Voltage Stability Studies with IPMSM System under the Control of MTPA |
| Zhong Zhihong, Fang Xiaochun, Lin Fei, Yang Zhongping |
| College of Electrical Engineering Beijing Jiaotong University Beijing 100044 China |
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Abstract In the motor closed-loop control system, the inverter-motor load can be treated as a constant power load due to the fast follow-up of the torque. The negative impedance characteristic of the constant power load(CPL) causes the traction drive system to have less damping, which causes the DC side voltage and current to oscillate. In this paper, the cause of DC side oscillation of the traction drive system induced by constant power load is expounded by analyzing the traction converter model, the mathematical model of the built-in interior permanent magnet synchronous motor(IPMSM) and the mathematical model of the control system. Then, through the small signal analysis. The admittance model of the inverter-built- in permanent magnet synchronous motor system under the control of Maximum Torque Per Ampere(MTPA) is deduced. On the basis of the admittance model in this paper, the influence of LC parameters, inductance parameters, stator resistance parameters and power on the stability of the system is analyzed by the stability analysis method in the frequency domain, and also, the influence of the parameters on the stability and the process of change of motor’s stability was found. Based on the theoretical analysis, a kind of active damping compensation method is realized. Simulation and experiment prove that the compensation method can effectively increase the system damping and improve the stability of the system.
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Received: 19 August 2016
Published: 10 November 2017
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2017, Vol. 32 
