一种优化协调控制策略在VSC HVDC 中应用

随着大功率电力电子技术的发展和可工作在高频率开关状态的完全可控器件(如大功率IGBT，IGCT等)的出现，使得电压源型直流输电(VSCHVDC)成为现实，这种新型的直流输电技术和传统直流输电相比，体现了诸多优点。该文建立了一种适合于研究VSCHVDC基频下的运行与控制特性的VSCHVDC模型，并将该模型方程与电力系统微分代数方程统一起来。在此基础上提出一种VSCHVDC与发电机励磁协调控制策略，在AC／DC交直流混合系统中研究了该控制方式对各自的影响，仿真表明，采用该优化协调控制，发电机和HVDC在系统发生故障或者扰动后都能够快速恢复正常稳定运行，且该控制方式对于系统参数变化具有一定鲁棒性。

Application of an optimal coordinated control strategy to VSC HVDC

With the development of power electronics and complete controllable components such as IGBT, IGCT in the condition of high frequency switching , VSC (Voltage Source Converter) HVDC is designed. Compared with conventional HVDC, it has many merits. A model of VSC HVDC,which is fit for researching the operation and control characteristics of VSC HVDC under its fundamental frequency, is established. And the equations of model is integrated with DA (Differential-Algebraic) equations of power system. An optimal coordinated control strategy between generator and VSC HVDC system is proposed based on established model, and the influence of control on both of them is reviewed in a AC/DC hybrid power system. The simulation results verify that, with the proposed optimal coordinated control, both the generator and the HVDC system can recover rapidly and work normally after the system faults or disturbance. In addition, it has robustness to the parameter variety of power system.