基于自抗扰控制的光伏微电网储能控制策略  

Energy Storage Control Strategy for Photovoltaic Microgrid Based on Active Disturbance Rejection Control

作　　者：王雨祺 赵兴勇[1] 赖建中 高兰香 宋玲燕 李贵君 WANG Yuqi;ZHAO Xingyong;LAI Jianzhong;GAO Lanxiang;SONG Lingyan;LI Guijun(School of Electricity and Construction,Shanxi University,Taiyuan 030013)

机构地区：[1]山西大学电力与建筑学院,太原030013

出　　处：《电气工程学报》2024年第3期423-431,共9页Journal of Electrical Engineering

基　　金：国网山西省电力公司科技(20201102028);山西省科技重大专项(520530200006)资助项目。

摘　　要：针对光储微电网中直流母线电压波动较大、抗扰性能较差的问题,提出一种基于改进线性自抗扰控制(Linear active disturbance rejection control,LADRC)的混合储能控制策略。首先,搭建光储微电网系统,根据超级电容和蓄电池的充放电特性,利用低通滤波器,将波动的功率在两者之间分配,由蓄电池承担电压环输出信号的低频分量,超级电容承担高频分量。然后,建立双向DC-DC变换器的数学模型,基于常规的双闭环控制,对电压环采用改进LADRC,并且对改进LADRC进行频域分析,该改进LADRC将总扰动微分信号引入了扩张状态观测器(Extended state observer,ESO)中,有效增强了ESO观测扰动的能力,能够更快地跟踪系统的总扰动,增强系统抗扰能力。最后,搭建时域仿真模型,结果表明,相比于传统PI和传统LADRC,改进LADRC的超调量更小,响应速度更迅速,提高了直流母线电压的抗扰性能。A hybrid energy storage control strategy based on improved linear active disturbance rejection control(LADRC)is proposed for the problem of large fluctuations DC bus voltage and poor immunity to interference in photovoltaic energy storage microgrid.First,an optical storage microgrid system is built,a low-pass filter is used to distribute the fluctuating power between the supercapacitor and the battery according to their charging and discharging characteristics,with the battery taking up the low-frequency component of the voltage loop output signal and the supercapacitor taking up the high-frequency component.Then,the mathematical model of the bidirectional DC-DC converter is built.Based on the control of traditional double closed-loop,the improved LADRC is adopted for the voltage loop.Furthermore,the frequency domain analysis is applied to the improved LADRC.The improved LADRC introduces the differential signal of disturbance into the extended state observer(ESO),which enhances the ESO observation of disturbances,and disturbances can be quickly tracked.Therefore,system immunity to interference is improved.Finally,the simulation model is built and the outcomes indicate that improved LADRC overshoot is smaller,the response is faster compared with other two methods and the immunity to interference of DC bus voltage is raised.

关 键 词：光储微电网 改进线性自抗扰控制 混合储能 双向DC-DC变换器 

分 类 号：TM933[电气工程—电力电子与电力传动]