三相静止坐标下H桥配网静止同步补偿器重复学习控制

Repetitive Learning Control in Three-Phase Stationary Reference Frame for H-Bridge D-STATCOM

与传统的三相桥式结构相比,同等器件耐压水平下,以模块化H桥单元为基础的配网静止同步补偿器(distributions static synchronous compensator,D-STATCOM)提高了应用电压等级。针对D-STATCOM装置,提出了基于三相静止坐标系的重复学习控制策略,该策略无需对系统电压进行锁相,具有实现简单的优点。电流内环采用基于重复学习控制的直接电流跟踪控制方法,在主电路关键参数变化较大的情况下,能够保证良好的稳态跟踪精度和动态响应速度。算例结果验证了该控制策略的有效性。

The main circuit topology of D-STATCOM based on modular H-bridge cell is researched.Compared with traditional three-phase bridge structure,the voltage rating of the researched device is improved with the same rating voltage of semi-conductor switch.A repetitive learning control strategy for D-STATCOM based on three-phase stationary reference frame,in which system voltage phase locked loop is cancelled,is proposed,so it is simple to implement.Current loop control is based on direct current tracking repetitive learning control to make output current possessing good steady state tracking precision and dynamic response performance under the remarkable change of key parameters of main circuit.The feasibility and effectiveness of the proposed control strategy is verified by simulation results of the STATCOM model based on the platform of PSCAD.