基于LMI方法的VSC-HVDC多重模型阻尼控制器设计

Design of VSC-HVDC Multi-model Damping Controller Based on LMI Method

电压源换流器式高压直流输电(VSC-HVDC)具有快速功率调整特性,结合相应附加小信号阻尼控制策略可以提高系统的低频阻尼能力。基于线性矩阵不等式(LMI)的优化方法为电力系统阻尼控制提供了新的设计途径。文中采用2步LMI优化方法,在建立系统多个运行点小信号模型基础上分别设计单一模型和多重模型运行点阻尼控制器,以改善系统阻尼特性。在PSASP中对3机系统的时域仿真分析表明,基于多重模型的阻尼控制器具有较强的适应性,可在大范围运行条件下向系统提供足够的阻尼。

VSC based HVDC technology features fast power regulation capability, which can increase the electromechanical damping Of a system with additional small signals damping control. LMI technique is a new approach in the power system damping controller design. Based on a multi operating-points model, a two-step LMI optimization method is applied in the design of single and multi-model damping controller. Simulation results on a PSASP three-machine system demonstrate that a multi-model based controller is robust in a relatively wide range of operating conditions.