提高交直流系统暂态稳定性的最优变目标控制策略

<title>timal variable aim control strategy for improving transient stability of AC/DC systems

提出一种用于改善交直流互联系统暂态稳定性的非线性控制策略。通过建立多机电力系统观测解耦状态空间模型,应用最优变目标控制策略推导出HVDC与发电机励磁的综合控制规律。该控制策略只需要当地信号实施控制,首先驱动系统达到按最大稳定域选择的人工中间稳定平衡点,然后才驱动系统到达所希望的稳定平衡点。仿真结果表明,该控制规律能较好地提高交直流互联系统的暂态稳定性。

<abstract>nonlinear control strategy to improve the transient stability of AC / DC systems is presented. On the basis of establishing an observation decoupled state space model of multi-machine power systems, and applying the theory of optimal variable aim control (OVAC), a comprehensive nonlinear control strategy for HVDC and generator excitation is deduced. The control strategy is easy to be implemented because it needs only local information, driving system states firstly to an artificial medial equilibrium point and secondly to a desirable equilibrium point. The simulation results show that the proposed method can improve transient stability of AC / DC systems obviously.