基于PID控制和改进粒子群优化算法的特高压直流附加次同步振荡阻尼控制器设计

Design of UHVDC Supplementary Subsynchronous Damping Controller Based on PID Control and Improved Particle Swarm Optimization Algorithm

以高压直流输电系统快速可控为出发点,采用极大极小值原理和改进粒子群优化算法相结合的新方法,针对向家坝—上海±800 k V特高压直流输电系统送端可能发生的次同步振荡(sub-synchronous oscillation,SSO)问题,建立一种基于比例积分微分控制的UHVDC附加次同步振荡阻尼控制器(subsynchronous oscillation damping controller,SSDC)模型。对不同方式的时域仿真结果表明,该SSDC控制器能够有效抑制交直流互联电网送端系统汽轮机组的轴系扭振,可在相当大范围内保证系统的SSO稳定性,具有较强的鲁棒性。

Taking the fast controllability of HVDC system into consideration, the model of supplementary subsynchronous oscillation damping controller (SSDC) on the basis of proportional-integral-derivative (PID) control was established to solve the potential sub-synchronous oscillation (SSO) problem in the sending end of ultra-high voltage direct current (UHVDC) transmission system from Xiangjiaba to Shanghai. A new method which combining mini-max value principle and improved particle swarm algorithm together is put forth so that the parameters of the controller could be designed and optimized conveniently. The time domain simulation results of different operation modes show that the SSDC designed is with strong robustness and can effectively restrain the shaft torsional vibration of steam turbine units.