中文摘要：

串联解耦和状态反馈解耦是目前常用的解耦控制方法。在配电网静止同步补偿器（D-STATCOM）中，由于电流d-q变换后存在耦合，常需要采用解耦控制。针对传统的状态反馈解耦对系统参数的变化较敏感的缺点，采用串联解耦对D-STATCOM进行控制。建立了D-STATCOM同步旋转坐标系下的数学模型，得出其d-q电流之间存在耦合；针对D-STATCOM的数学模型设计了基于串联解耦控制的控制器；为了对比串联解耦和状态反馈解耦的效果，分别推导了当系统参数发生变化时它们的系统传递函数，通过分析传递函数的波特图从控制理论的角度定性地得出串联解耦控制的鲁棒性和动态性能要优于状态反馈解耦控制。仿真结果也表明串联解耦控制具有鲁棒性好、响应速度快的特点。

英文摘要：

As there exists coupling among the d -q currents of D-STATCOM, decoupling control is normally needed, of which, series decoupling and state feedback decoupling are commonly used. The series decoupling is used to control D-STATCOM control because the state-feedback decoupling is more sensitive to system parameter variation. The mathematical model of D-STATCOM under synchronous rotating coordinates is established and there is coupling between d-q currents, for which the series decoupling controller is designed. To compare the effect between series decoupling control and state-feedback decoupling control, their system transfer functions are deduced respectively under system parameter variation. The Bode chart analysis shows that the robustness and dynamic performance of the series decoupling control is better than those of the state-feedback decoupling control, which is also proved by simulation result.