基于同步相量测量单元的观测线性化追踪目标励磁控制策略

Observational Linearization and Tracking Objective Excitation Control Strategy Based on Phasor Measurement Unit

为了进一步改善电力系统的暂态稳定性,结合同步相量测量单元(PMU)和观测线性化追踪目标控制理论,推导出了基于同步坐标系和参考机坐标系的多机电力系统观测线性化追踪目标励磁控制规律。该控制策略利用PMU测量得到的系统实时运行状态量实现了状态方程线性化,从而可以对励磁控制器进行线性最优控制设计,避免了非线性系统局部线性化的不精确性和精确线性化时系统模型设计的复杂性,适合于在线应用。仿真结果表明,该控制策略较之非线性最优励磁控制能更好地提高电力系统的暂态稳定性。

To improve transient stability of muhi-machine power systems, observational linearization and tracking objective excitation control rules were derived from Phasor Measurement Unit （PMU） and observational linearization and tracking objective control theory based on synchronized coordinates and reference generator coordinates. The control strategies utilized the real-time state variables obtained by PMU to linearize the state equations of the system, and then the linear optimal control strategy was used to design excitation controller. The inaccuracy of local linearization method and the complexity of system models designed in accurate linearization method for nonlinear systems were avoided. Therefore the control strategies were applied in real-time. Simulation results showed that the proposed method can improve transient stabihty of power systems more efficiently than nonlinear optimal excitation control.