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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。
Compared with the traditional three-phase bridge structure, distribution voltage static synchronous compensator (D-STATCOM) based on modular H-bridge unit improves the applied voltage level under the same device withstand voltage level. For D-STATCOM device, a repetitive learning control strategy based on three-phase stationary coordinate system is proposed, which does not need to phase-lock the system voltage and has the advantages of simple implementation. The current inner loop adopts the direct current tracking control method based on repetitive learning control, which can ensure good steady state tracking accuracy and dynamic response speed under the condition that the main parameters of the main circuit vary greatly. The result of the example verifies the effectiveness of this control strategy.