基于最优变目标策略的励磁系统与SVC协调控制

发电机励磁系统以及静止无功补偿器(SVC)对远距离输电系统的稳定性有很大影响。文章基于单机无穷大系统的非线性模型,建立了包括状态变量发电机机端电压在内的状态空间方程,提出了一种最优变目标控制(OVAC)策略,根据励磁系统和SVC不同的控制目标分别采用不同的控制策略,从而协调控制这两种控制器。仿真结果表明,该策略能够有效提高故障时发电机的无功出力,并能提高系统阻尼,抑制振荡,同时改善系统的功角和电压稳定性。

Coordination Control between Generator Excitation and SVC Based on Optimal Variable Aim Strategy

The influence of generator excitation system and static var compensator (SVC) on stability of long-distance transmission system is great. Based on the nonlinear model of single-machine infinite-bus power system, a set of state space equations including terminal voltage of generator that is regarded as state variable are built, and an optimal variable aim control (OVAC) strategy is proposed. According to different control aims, different control strategies are applied to the excitation system and SVC respectively, therefore these two controllers are coordinately controlled. Simulation results show that, by use of the proposed control strategy, generator's reactive output while fault occurs can be effectively enhanced, the damping of system can be improved, oscillation can be restrained and power angle and voltage stability can be improved.