基于虚拟阻抗和模糊PID的微电网下垂控制策略  

Micro-grid droop control strategy based on virtual impedance and fuzzy PID

作　　者：王福忠[1] 李润宇 张丽[1] WANG Fuzhong;LI Runyu;ZHANG Li(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454000

出　　处：《传感器与微系统》2022年第3期62-65,71,共5页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(U1804143);河南省开放实验室项目(KG2016-7);河南省高等学校重点科研项目(18A470014);河南理工大学博士基金资助项目(B2017-20);河南理工大学青年骨干教师项目(2019XQG-17)。

摘　　要：在低压微电网中,当系统负荷发生波动时,P-V/Q-f下垂控制对功率分配、系统电压和频率同时进行控制的精准度就会下降,从而导致电网系统稳定性减弱。针对此问题,提出基于虚拟阻抗和模糊PID的低压微电网下垂控制策略,通过引入虚拟阻抗和模糊PID控制器,在改变系统阻抗的同时,自适应调整下垂系数,综合解决低压微电网在孤岛运行时出现的问题。最后,搭建了Simulink仿真平台验证其可行性,并将三种控制方式进行电压和频率的比较,结果表明:该策略可有效提高功率分配并抑制在负荷波动时的系统电压和频率的震荡,总体上提升系统稳定性。In a low-voltage microgrid,when the system load fluctuates,the accuracy of the P-V/Q-f droop control to control power distribution,system voltage and frequency simultaneously will decrease,resulting in weakening the stability of the grid system.Aiming at this problem,a low voltage microgrid droop control strategy based on virtual impedance and fuzzy PID is proposed.By introducing virtual impedance and fuzzy PID controller,while changing the system impedance,adaptively adjust the droop coefficient to comprehensively solve the problem of low voltage microgrid in islands Problems during operation.Finally,a Simulink simulation platform is built to verify its feasibility,and the three control methods are compared for voltage and frequency.The results show that the strategy can effectively improve power distribution and suppress system voltage and frequency oscillations during load fluctuations.Overall Improve system stability.

关 键 词：独立低压微电网 P-V/Q-f下垂控制 虚拟阻抗 模糊比例-积分-微分控制 系统稳定 

分 类 号：TM76[电气工程—电力系统及自动化]