适用于光伏接入中压直流配电网的改进型LADRC恒压控制策略  

Improved LADRC constant voltage control strategy for photovoltaic integration into MVDC distribution networks

作　　者：李辰佳 李琰 范译文 刘超 王聪 何杨 LI Chenjia;LI Yan;FAN Yiwen;LIU Chao;WANG Cong;HE Yang(China Electric Power Research Institute,Beijing 100192,China;State Grid Beijing Electric Power Company,Beijing 100031,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]国网北京市电力公司,北京100031

出　　处：《电力系统保护与控制》2025年第3期37-46,共10页Power System Protection and Control

基　　金：国家自然科学基金项目资助(U23B20120)。

摘　　要：在外界扰动出现时,含光伏的中压直流配电系统的母线电压会发生波动,给电力系统的稳定运行带来挑战。针对传统光伏恒压控制策略抗扰性不足的问题,提出了基于改进型线性自抗扰控制(linearactivedisturbance rejection control,LADRC)的光伏恒压控制策略。对于两级集成式的DC/DC变换器,采用基于微分反馈的线性扩张状态观测器(linear extended state observer,LESO),设计改进型LADRC结构,并详细分析了控制器的参数整定、抗扰性和稳定性。在仿真平台中将采用PI控制、传统LADRC和改进型LADRC的光伏恒压控制效果进行对比。结果表明,基于改进型LADRC的光伏恒压控制策略具有优秀的抗干扰能力,能够以更小的超调量和更快的响应速度使直流母线电压恢复稳定。When external disturbances occur,the bus voltage of a MVDC distribution system with PV integration will fluctuate,posing challenges to the stable operation of the power system.In this paper,a PV constant voltage control strategy based on improved linear active disturbance rejection control(LADRC)is proposed to address the insufficient disturbance rejection of traditional PV constant voltage control strategies.For the two-stage integrated DC/DC converter,a linear extended state observer(LESO)based on differential feedback is used to design the improved LADRC structure,and the parameter tuning,disturbance rejection,and stability of the controller are analyzed in detail.The effects of PV constant voltage control using PI control,traditional LADRC,and improved LADRC are compared on a simulation platform.The results show that the PV constant voltage control strategy based on the improved LADRC has excellent anti-interference capability and can restore the DC bus voltage to stability with smaller overshoot and faster response speed.This work is supported by the National Natural Science Foundation of China(No.U23B20120).

关 键 词：光伏发电系统 中压直流系统 线性自抗扰控制 抗干扰能力 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM615