基于Simulink的HVDC PI控制器参数优化方法

摘要

为了提高高压直流输电系统的抗干扰能力,提出了基于Simulink的HVDC系统PI控制器参数离线和在线的优化方法.离线优化法是利用Simulink内置Signal Constraint模块确定出满足条件的PI控制器参数；在线优化法是采用非线性PI和自适应模糊控制相结合的方式对PI控制器参数进行优化.以整流侧定电流控制为例,首先利用模糊控制能够在线优化控制器参数的特点,缩小了PI参数的优化范围；然后利用fal函数进一步修正了其优化精度.仿真结果表明,离线优化法具有简单实用的优点,在线优化法能够提高系统的优化精度,使系统具有良好的控制性能.%In order to improve the anti-interference ability of HVDC(High Voltage Direct Current) power transmission system,the off-line and on-line parameter optimization methods for its PI controller are proposed based on Simulink. The off-line method uses the Signal Constraint module of Simulink to determine the parameters of PI controller satisfying the given conditions while the on-line method combines the nonlinear PI with the adaptive fuzzy control to optimize the parameters of PI controller. With the constant current control at rectifier side as an example,the on-line fuzzy control is used first to reduce the optimization range of controller parameters and the fal function is then applied to further improve the optimization precision. Simulative results indicate that,the off-line optimization method is simple and practical while the on-line optimization method improves the optimization precision and control performance of system.