摘要
农村小型光伏微网通常运行在孤岛模式下,经常伴随小扰动的困扰。传统下垂控制受限于自身有差调节的特性,在存在扰动的情况下,无法稳定系统的频率在国标范围内。为了提高系统抗小扰动稳定性,提出一种动态下垂系数的控制方法,根据系统扰动的大小,动态的改变下垂系数,保证光伏系统频率误差在±0.2Hz范围内。利用Matlab/Simulink搭建光伏微网孤岛运行模型,仿真结果表明,通过引入动态下垂系数,能够明显提高系统频率稳定性,抗小扰动性能明显增强。
Rural small photovoltaic microgrids usually operate in island mode,often accompanied by small disturbances.Traditional droop control is limited by its own characteristics of differential adjustment.In the presence of disturbances,it cannot stabilize the frequency of the system within the national standard range.In order to improve the stability of the system against small disturbances,a dynamic droop coefficient control method is proposed.According to the magnitude of the system disturbance,the droop coefficient is dynamically changed to ensure that the frequency error of the photovoltaic system is within±0.2 Hz.Finally,Matlab/Simulink is used to build a photovoltaic microgrid island operation model.The simulation results show that by introducing a dynamic droop coefficient,the system frequency stability can be significantly improved,and the anti-small disturbance performance is significantly enhanced.
作者
高瑜
刘建明
张金
范鑫
GAO Yu;LIU Jian-ming;ZHANG Jin;FAN Xin(College of Electrical and Control Engineering,Xi'an University of Science and Technology,Xi'an Shanxi 710054,China)
出处
《计算机仿真》
北大核心
2022年第11期80-84,共5页
Computer Simulation
基金
国家自然科学基金资助项目(51777166)。
关键词
小型光伏微网
孤岛运行
小扰动
频率稳定性
动态下垂系数
Small photovoltaic microgrid
Island operation
Small disturbance
Frequency stability
Dynamic droop coefficient
