摘要
针对可再生能源发电随机性导致微电网频率存在稳态偏差的问题,为了控制电网频率波动,在传统自抗扰控制的基础上设计了改进型自抗扰控制器,对风-光-柴-储微电网进行负荷频率的优化控制。考虑到实际存在的调速器侧隙和发电速率约束的非线性导致的系统不稳定,提出了一种针对多区域多发电机的抗饱和误差补偿策略,提高了控制器的控制性能,并将重复控制与自抗扰控制相结合,该复合控制方法提高了控制器精度,增强了系统鲁棒性。利用Simulink建立两区域电力系统负荷频率控制的仿真模型,将PID控制器、传统自抗扰控制器与改进型自抗扰控制器进行仿真比较,仿真结果表明,改进后的控制器能够迅速地将频率偏差收敛到零,从而使电网的频率保持在额定范围内,从而大大改善了系统的稳定性,提高了系统的动态性能。
Aiming at the problem of steady-state deviation of microgrid frequency caused by the randomness of re-newable energy power generation,in order to control the frequency fluctuation of the power grid,an improved self-dis-turbance rejection controller is designed on the basis of traditional disturbance rejection control to optimize the load frequency control of wind-solar-diesel-storage microgrid.Considering the system instability caused by the actual nonlinearity of governor backlash and power generation rate constraints,an anti-saturation error compensation strategy for multi-region and multi-generator is proposed,which improves the control performance of the controller and combines the repetitive control with the automatic disturbance rejection control,and the composite control method improves the accuracy of the controller and enhances the robustness of the system.Simulink is used to establish a sim-ulation model of load frequency control of the two-region power system,and the PID controller,the traditional NCB controller and the improved NCB controller are simulated and compared,and the simulation results show that the improved controller can quickly converge the frequency deviation to zero,so that the frequency of the power grid is kept within the rated range,thereby greatly improving the stability of the system and improving the dynamic performance of the system.
作者
何迎
肖健梅
王锡淮
HE Ying;XIAO Jian-mei;WANG Xi-huai(Shanghai Maritime University,Shanghai 201306,China)
出处
《计算机仿真》
2024年第11期109-113,共5页
Computer Simulation
关键词
微电网
负荷频率控制
自抗扰控制
复合控制
调速器侧隙
发电速率约束
Microgrids
Load frequency control
Disturbance rejection control
Composite control
Governor dead band
Generation rate constraints
