基于改进PSO算法的VSC-HVDC控制器的优化设计

摘要

The operating characteristics is determined by the controller parameters of transmission system in the VSC -HVDC,in order to make full use of the fast and controllable characteristics in the VSC-HVD,this paper takes advan-tage of the improved PSO(particle swarm optimization)algorithm to optimize the outer ring PI parameters of the recti-fier side controlled by constant active power.Firstly,the small signal model of the rectifier is established.Then,the equivalent transfer function of the inner loop is deduced.Besides,the optimization of the outer loop PI parameters is conducted based on the deduced equivalent transfer function in the MATLAB.Finally,compared with the original pa-rameters in the PSCAD/EMTDC,the simulation results show that the transient performance based on the proposed op-timization method has been improved significantly, when the system is running at different operating points, the re-sponse characteristics are improved obviously,meanwhile,the system has strong robustness.%柔性直流(VSC-HVDC)输电系统的控制器参数决定了系统的运行特性,为了充分发挥柔性直流输电系统快速可控的特点,采用改进的粒子群算法(Particle Swarm Optimization,PSO)对柔性直流输电系统中整流侧定有功功率控制中外环的PI参数进行了优化.首先建立了整流侧定有功功率的小信号模型,然后推导出了内环的等效传递函数,在MATLAB中基于推导的传递函数对外环PI参数进行优化,最后在PSCAD/EMTDC环境下通过与原始参数阶跃响应的仿真结果对比表明,采用提出的优化方法后,系统的暂态性能得到了明显的提高.同时当系统运行于不同的工作点时,系统的响应特性也有明显的改善,具有较强的鲁棒性.