一种铁路功率调节器的改进单周控制方法

为了治理高速铁路机车引起的电能质量问题,维持一个清洁安全的电网,文中讨论了一种先进的铁路功率调节器。针对高速铁路机车的随机性和快速性,提出了一种基于等效负载电阻电压前馈控制的改进单周控制方法。通过等效负载电阻电压前馈控制的方法,可以实时跟踪机车负载的变化,能有效提高控制系统动态响应性能。通过单周控制对直流侧电压进行闭环比例—积分控制,可以稳定直流侧电压,以保证铁路功率调节器的正常、可靠工作。为了克服死区时间对单周控制补偿精度的影响,采用一种死区补偿方法对死区进行了有效补偿。最后,通过仿真和实验验证了所提出控制方法的正确性,有效地改善了牵引供电网的电能质量水平。

An Improved One-cycle Control Method of Railway Power Static Conditioner

To mitigate the power quality issue of traction power system caused by locomotives and maintain a clean and safe power grid,a railway power static conditioner is discussed.As the railway locomotive is random and fast,an improved one-cycle control method based on equivalent resistance feedforward control is presented.The equivalent load feedforward control can track the variations of load in real-time,which effectively improves the dynamical performance of the control system.The PI control of DC-link voltage can maintain a stable DC-link voltage and ensure the normal operation of railway static power conditioner.In order to overcome the dead-time effect,a dead-time compensation method is adopted to enhance the compensation accuracy.Finally,simulation and experimental results verify the correctness of the proposed control method.