论文部分内容阅读
提出了一种励磁与静止同步串联补偿器(SSSC)之间的协调控制方法。针对系统的仿射非线性方程,首先通过精确反馈线性化方法(EFL)将系统非线性因素转换到含有控制输入的状态方程中。系统参数的不确定、模型的不精确通过坐标变换最终反映到转换后的非线性部分。进而利用扩张状态观测器(ESO)观测该非线性部分,实现了线性化并提高了EFL对于参数不确定、模型不精确的弱鲁棒性。线性函数被应用于ESO,避免了以往ESO求解过程中参数众多、求解复杂的缺点。最终,励磁与SSSC之间实现了解耦,并由此得到了协调控制方法。介绍了应用电磁暂态仿真软件PSCAD/EMTDC搭建的系统以及控制器数字模型。仿真结果证实了所提出的协调控制方法具有较高的鲁棒性,可大幅度提高系统稳定性。
A coordinated control method between excitation and static synchronous series compensator (SSSC) is proposed. For the affine nonlinear equations of the system, the nonlinear factors of the system are firstly transformed into the equation of state containing the control inputs by means of an accurate feedback linearization (EFL). The system parameters are uncertain and the inaccuracy of the model is finally reflected in the transformed non-linear part by coordinate transformation. Then, the non-linear part is observed by means of extended state observer (ESO), which realizes linearization and enhances the weak robustness of EFL to uncertain parameters and inaccurate model. The linear function is applied to ESO, which avoids the shortcomings of many parameters and complicated solution in the past ESO solving. In the end, the decoupling between excitation and SSSC was achieved, and the coordinated control method was obtained. The system and the digital model of controller built by PSCAD / EMTDC are introduced. The simulation results show that the proposed coordinated control method has high robustness and can greatly improve system stability.