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本文针对多机电力系统提出一种广域非线性鲁棒电压控制策略.针对COI(center of inertia)坐标系下的系统数学模型,提出一种简单而巧妙的模型变换方法,将其转换为一个引入了发电机的机端电压偏差为新的状态变量的不确定线性系统,进而应用基于线性矩阵不等式(linear matrix inequality,LMI)的鲁棒控制理论设计出控制器.所提出的广域非线性鲁棒电压控制器不依赖于系统某个特定运行点,可适应系统网络参数以及运行方式的变化,保证机端电压调节精度.控制器不需要测量发电机转子角及任何变量的微分,仅需要测量发电机的机端电压、角速度、有功及无功功率.此外,控制器考虑了广域反馈信号的时滞以及部分机组未装设相量测量装置(phase measurement unit,PMU)的影响.应用PSCAD/EMTDC对某三机和四机系统进行了详细测试,仿真结果验证了控制器的良好性能.
In this paper, a wide area nonlinear robust voltage control strategy is proposed for multi-machine power system.According to the system mathematical model in the COI (center of inertia) coordinate system, a simple and ingenious model transformation method is proposed, which is converted into a The uncertain linear system with terminal voltage deviation of generator as the new state variable is introduced, and then the controller is designed by using robust control theory based on linear matrix inequality (LMI). The proposed nonlinearity of wide-area nonlinearity The robust voltage controller does not depend on a specific operating point of the system and can adapt to changes of system network parameters and operating modes to ensure the terminal voltage regulation accuracy. The controller does not need to measure the generator rotor angle and the derivative of any variable, Measuring generator terminal voltage, angular velocity, active and reactive power In addition, the controller considers the time delay of the wide-area feedback signal and the impact of some units not equipped with a PMU (phase measurement unit) PSCAD / EMTDC carried out a detailed test of a three-machine and a four-machine system, and the simulation results verified the good performance of the controller.