轨道交通柔性交流牵引供电系统无源一致性稳定控制方法

Passivity-consensus-based Control Method for Flexible AC Traction Power Supply Systems of Rail Transit

针对以双向变流器为核心的轨道交通柔性交流牵引供电系多变量、强耦合、非线性特性,在dq坐标下建立双线性系统模型,满足状态变量与控制变量同步线性变换,设计形式简单的无源性控制律,将相邻双向变流器一致性误差嵌入无源性控制器输出量,实现变流器直流侧电压与dq轴电流期望轨迹同步快速跟踪,达成多变流器协同控制目标。基于MATLAB的仿真结果验证所提方法在列车负荷功率需求变化、控制器参数摄动情形下能实现多变流器功率精确分配,相比传统下垂PI控制,所提方法具有动态响应快、同步性好、稳定性高的特点。

Addressing the multivariable,strong coupling and nonlinear characteristics of the flexible AC traction power supply system in rail transit centered on a bidirectional converter,a bilinear system model is established in dq coordinates to facilitate the synchronous linear transformation of state and control variables.The consistency error of adjacent bidirectional converters is incorporated into the passive controller’s output,which enables the synchronous fast tracking of the expected trajectory of the converter's DC-side voltage and dq-axis current,achieves the cooperative control targets of multiple converters.MATLAB-based simulations verify that the proposed method ensures accurate power distribution among multiple converters even under the conditions of varying train load power demand and controller parameter perturbations.Compared to traditional droop PI control,the proposed method exhibits the characteristics of fast dynamic response,good synchronization and high stability.