摘要
目前广泛应用的光伏并网逆变器不具备有利于维持电力系统稳定的惯性与阻尼,所以基于电力系统机电暂态理论对光伏逆变器虚拟惯性与阻尼综合控制策略进行研究具有重大意义。利用同步发电机二阶数学模型构建虚拟同步发电机(virtual synchronous generator,VSG)本体模型,根据同步发电机有功功率平衡与频率调整控制理论以及无功功率平衡与电压调整控制理论分别设计了VSG功频控制器与励磁控制器。在MATLAB/Simulink仿真平台建立分布式光伏逆变器的VSG控制系统仿真模型,仿真结果表明,当负载发生变化时,基于VSG控制的分布式光伏逆变器具有良好的动态调节特性与稳定性。
At present,the widely used grid-connected photovoltaic inverters do not have inertia and damping,which are beneficial to maintain the stable operation of the power system.Integrated control strategy of virtual inertia and damping for photovoltaic inverter is studied based on the electromechanical transient theory of power system.The virtual synchronous generator(VSG)ontology model is constructed by using the second-order mathematical model of synchronous generator.According to the active power balance and frequency adjustment control theory of synchronous generator and the reactive power balance and voltage adjustment control theory,it designes VSG power frequency controller and excitation controller in separately.The VSG control system simulation model of distributed photovoltaic inverter is established on MATLAB/Simulink simulation platform.The simulation results show that when the load changes,the distributed photovoltaic inverter based on VSG control has good dynamic regulation characteristics and stability.
作者
徐征龙
高长伟
李东宇
张凤军
XU Zhenglong;GAO Changwei;LI Dongyu;ZHANG Fengjun(Sino-American Double Hundred Institute,Liaoning University of Science and Technology, Benxi,Liaoning 117004,China;Electrical and Information Engineering institute, Liaoning University of Science and Technology, Benxi,Liaoning 117004,China)
出处
《东北电力技术》
2022年第5期1-5,共5页
Northeast Electric Power Technology
基金
辽宁科技学院大学生创新训练计划项目(基于改进VSG功率控制策略的光伏发电系统研究)
辽宁省普通高等教育本科教学改革研究一般项目(新工科背景下多方协同育人的“工程实践”教学模式研究)
辽宁科技学院博士科研启动基金项目(2101B01)。
关键词
分布式
光伏逆变器
虚拟惯性
阻尼
distribution
photovoltaic inverter
virtual inertia
damping
