一种基于非线性PI的DSTATCOM串级解耦控制策略

建立了配电网静止无功同步补偿器（distribution static synchronous compen-sator，DSTATCOM）在幽坐标系下的数学模型，求得了其解耦后的控制系统结构，使得无功电流和有功电流可以独立控制。在解耦控制基础上引入一种计算简单的具有自整定功能的非线性PI控制方法，提出了基于非线性PI的串级解耦控制策略，并给出了控制器的参数计算方法。最后，在PSIM仿真环境下搭建了仿真模型，对模型参数精确和不精确两种情况及变负荷工况分别进行了仿真试验，验证了所提控制策略的可行性与优越性能。

A Decoupling Control Strategy Based on Nonlinear PI Control for DSTATCOM

The mathematic model of the distribution static synchronous compensator （DSTATCOM）was estab- lished in dq coordinates, and the decoupled control system structure of DSTATCOM was got, which makes it a- chievable to control the active current and the reactive current respectively. A nonlinear PI control method with easy compute and adaptive ability was introduced, and the decoupling control based on nonlinear PI control method was proposed, and the design method for parameters of the controller was given. At last, the simulation model was con- strueted in PSIM, and the simulation results under precise mathematic model and imprecise mathematic model prove that the control method is correct and effective.