【摘要】 基于线性扩张状态观测器和李雅普诺夫(Lyapunov)直接法设计了风电场同步稳定控制策略,驱动系统达到故障后平衡点。首先将含有风电场接入的电力系统建模为串级系统,利用串级控制理论设计风电场稳定控制策略。其中,同步机为第一级,风电场为第二级子系统。针对同步机子系统,通过等效可控变换将多机系统转化为风电场等效可控系统,利用线性扩张状态观测器和Lyapunov直接法设计了改善系统同步稳定性的虚拟控制律。针对风电场子系统,基于线性扩张状态观测器设计了风电场的稳定控制律,使风电场功率调制能够快速跟踪虚拟控制律。控制策略无需系统的详细模型信息,具有良好的鲁棒性。在改进的IEEE39节点系统中,验证了控制策略的有效性和鲁棒性。更多还原

【Abstract】 Based on linear extended state observer(LESO) and Lyapunov direct method(LDM), a stability control strategy is proposed to drive the system to the post-fault equilibrium point. The power system with wind farms integration was modeled as a cascade system first: the synchronous generators as first subsystem; the wind farms as second subsystems, and then, a stability control strategy was proposed based on the cascade system. For the synchronous generator subsystem, it was transformed into a wind farm equivalent controlled system by a proposed coordinate transformation, and then a virtual control was designed to improve the synchronous stability of power system based on LESO and LDM. For the wind farm subsystem, the control strategy was designed to make the output of wind farm track the virtual control quickly and accurately based on LESO. The proposed control strategy does not need the exact knowledge of the system model and has a good robustness. The study cases carried on modified IEEE 39-bus system verify the effectiveness and robustness of the proposal control strategy.更多还原