柔性励磁系统的强励协调控制策略

为了提升电力系统暂态稳定性,根据等面积法则,提出了一种柔性励磁系统强励协调控制策略。当通过故障时增大直流侧电压的方法增大励磁电压顶值,提升系统强励能力,解决了现有柔性励磁系统强励能力受限于直流侧电压的问题。采用以直流侧电压平方值为控制量的线性化间接电压外环控制和基于合成矢量的无电感电流内环控制,提升电压外环动态响应能力,降低网侧电感对控制效果的影响,保证直流侧电压快速响应能力,提供更好更强的强励效果,实现强励协调控制。最后,基于柔性励磁的单机无穷大系统进行了仿真分析,验证了本文所提控制策略的有效性及其相对于传统控制方法的优异性。

Coordination Control Strategy of Intensive Excitation in Flexible Excitation System

In order to improve the transient stability of power system,a strong excitation coordination control strategy for flexible excitation system is proposed according to the equal area rule.By increasing the DC side voltage when the fault occurs,the top value of the excitation voltage is increased,and the system's strong excitation ability is enhanced.The problem that the existing flexible excitation system's strong excitation ability is limited by the DC side voltage is solved.Linearized indirect voltage outer loop control based on square value of DC side voltage and inductance-free current inner loop control based on synthetic vector are adopted to enhance the dynamic response ability of voltage outer loop,reduce the influence of inductance on control effect,ensure that the DC side voltage can be raised rapidly when the system needs strong excitation,provide better and stronger strong excitation effect,and realize the coordinated control of strong excitation.Finally,a single machine infinite bus system based on flexible excitation is simulated and analyzed to verify the effectiveness of the proposed control strategy and its superiority over the traditional control method.