基于模型预测电流补偿的电压稳定控制策略

A Voltage Stability Control Strategy Based on Model Predictive Current Compensation

在电力推进系统中,随着永磁同步电机功率的增加,驱动系统输入阻抗和LC滤波环节的输出阻抗不匹配,引起直流环节电压振荡,导致系统不稳定。因此,提出了一种基于模型预测电流补偿稳定控制策略,同时,推导了系统的输入阻抗和输出阻抗,并利用Middlebrook稳定判据等分析系统的稳定性。最后,与基于参考电流的PI稳定控制策略进行对比。因为模型预测电流控制器具有更快的动态响应,所以具有更好动静态性能。通过仿真验证了该方法的有效性和相比于PI控制具有更好的性能。

In electric propulsion system,the input impedance of the drive system did not match the output impedance of LC with the increase of the power of the PMSM,which would cause the DC-link voltage oscillation and system instability.Thus,a model predictive current compensation stability control strategy was proposed.At the same time,the input impedance and output impedance of the system were derived.And Middlebrook stability criterion was used to analyze the stability of the system.Finally,the method was compared with the PI stability control strategy based on reference current.The model predictive current controller has better dynamic and static performance due to its faster transient response.Simulation results verify that the method is effective and has better performance than PI control.