摘要
针对新能源设备功率变化会引起直流母线电压波动,且在电网频率波动较大的弱电网环境下,有功功率可能会产生功率振荡,从而使构网型光储系统暂态性能变差的问题,采用虚拟同步发电机技术,提出一种基于降阶高增益观测器(reduced-order high gain observer,RHGO)的新型终端互补滑模控制(novel terminal complementary sliding mode control,NTCSMC)策略。首先,在观测器中引入高增益系数来抑制瞬态振荡,并通过降阶设计对观测器结构进行简化;其次,在终端互补滑模面上引入控制系数,增强了被控系统的稳定性,并设计超螺旋切换律来抑制抖振;然后,从理论上证明RHGO和NTCSMC的稳定性;最后在MATLAB仿真和实验平台上,分别对比例积分(proportional integral,PI)控制、基于传统扩张状态观测器-滑模控制(extended state observer-sliding mode control,ESO-SMC)与改进ESO-SMC控制方法进行仿真及实验验证。结果表明,所提控制方法在构网型光伏并网储能系统的暂态性能方面具有良好的效果。
Aiming at the problem that the DC bus voltage fluctuation will be caused by the power change of new energy equipment,and the active power may produce power oscillation under the weak power network environment with large frequency fluctuation of the power grid,thus worsening the transient performance of the grid-type optical storage system,based on the virtual synchronous generator technology,a novel terminal complementary sliding mode control(NTCSMC)strategy based on the reduced-order high gain observer(RHGO)is proposed.Firstly,a high gain coefficient is introduced into the observer to suppress transient oscillations,and the structure of the observer is simplified by a reduced-order design.Secondly,the control coefficient is introduced on the terminal complementary sliding mode surface to enhance the stability of the controlled system,and the superhelical switching law is designed to suppress buffeting.Then,the stability of RHGO and NTCSMC is proved theoretically.Finally,proportional integral(PI)control,traditional extended state observer-sliding mode control(ESO-SMC),and improved ESO-SMC control methods are simulated and verified by experiments on MATLAB simulation and experiment platform.The results show that the proposed control method has a good effect on the transient performance of grid-connected photovoltaic energy storage systems.
作者
薛瑞泽
李星
王嘉力
任俊恒
皇金锋
XUE Ruize;LI Xing;WANG Jiali;REN Junheng;HUANG Jinfeng(School of Electrical Engineering,Shaanxi University of Technology,Hanzhong 723001,China;Xi’an Xingyuan Bo Rui New Energy Technology Co.,Ltd.,Xi’an 710000,China;School of Physics and Telecommunication Engineering,Shaanxi University of Technology,Hanzhong 723001,China)
出处
《山东电力技术》
2025年第6期33-43,共11页
Shandong Electric Power
基金
陕西省自然科学基金面上项目(2023-JC-YB-442)。
关键词
虚拟同步发电机
构网型光储系统
降阶高增益观测器
新型终端互补滑模
暂态性能
virtual synchronous generator
grid-forming PV-storage system
reduced-order high gain observer(RHGO)
novel terminal complementary sliding mode(NTCSMC)
transient characteristics
