基于IPOA和PIDD2-FOI的电力系统负荷频率控制

Power system LFC based on IPOA and PIDD2⁃FOI

对于互联电网的负荷频率控制而言,不合适的控制器或者不合适的控制器参数选择会严重降低电网在遭遇负荷扰动时的稳定性,因此,选择合适的控制器并进行有效的参数整定十分重要。针对两个区域互联电网的负荷频率控制问题,设计一种带一阶惯性环节和滤波系数的PID加二阶导数控制器(PIDD2-FOI)。为了更好地寻找控制器的最优参数,基于Tent混沌映射对鹈鹕优化算法进行改进,并将经过改进的鹈鹕优化算法(IPOA)与其他算法在不同的测试函数下进行对比。结果表明,改进的鹈鹕优化算法不易陷入局部最优,具有更好的寻优效果。再以时间乘绝对误差积分(ITAE)准则作为目标函数,采用IPOA同时进行多种控制器参数优化,在多种干扰情形下对比不同控制器的控制效果。对比结果表明,所设计的PIDD2-FOI控制器具有更优越的控制能力,可以有效地维持系统的频率和联络线交换功率的稳定。

For the load frequency control(LFC)of interconnected power grids,unsuitable controller or inappropriate controller parameter selection can seriously reduce the stability of the power grid when when it encounters load disturbance.Therefore,selecting suitable controller and conducting effective parameter tuning is very important.A PID plus second-order derivative controller with first-order inertia and filter coefficient(PIDD2-FOI)is designed for the LFC of two regional interconnected power networks.In order to better find the optimal parameters of the controller,the pelican optimization algorithm(POA)is improved based on Tent chaotic mapping,and the improved pelican optimization algorithm(IPOA)are compared with other algorithms under different testing functions.The results show that the IPOA is not easy to fall into local optimal,and has better optimization effect.With the integrated time and absolute error(ITAE)criterion as the objective function,IPOA is used to optimize several controller parameters simultaneously,and the control effects of different controllers are compared under various interference conditions.The comparison results indicate that the designed PIDD2-FOI controller has superior control capability,which can effectively maintain the stability of the frequency of the system grid and the stability of exchange power of the tie line.