摘要
虚拟同步发电机(virtual synchronous generator,VSG)技术是通过微网逆变器模拟传统同步发电机(synchronous generators,SG)的特性,使得分布式能源可以提供相应的惯性和阻尼特性,能够主动为大电网提供电压和频率支撑,提高了电力系统的稳定性.针对中低压微网输电线路呈阻感性,VSG多机并联会产生的功率分配不均的问题,提出了虚拟阻抗和虚拟功率结合的控制策略,能够使VSG多机并联在不满足阻抗匹配条件下精确地分配负荷功率.阐述了传统VSG模型,以便确保VSG具有SG的特性,然后搭建了不同容量的两台VSG并联运行模型,分析了VSG多机并联系统关键参数的匹配方法,最后通过Matlab/Simulink对单台VSG和两台并联VSG进行了仿真,验证了所提控制策略的有效性和可行性.
Virtual Synchronous Generator(VSG)technology simulates the characteristics of traditional synchronous generators(SG)through microgrid inverters,so that distributed energy can provide corresponding inertia and damping characteristics,and can actively provide voltage and frequency support for the large grid,improving the stability of power system.Since the transmission line of medium-low voltage microgrid is both resistive and inductive and multi-VSGs parallel has uneven power sharing problem,in this paper,a combining control strategy based on virtual impedance and virtual power is proposed.It can make the multi-VSGs parallel system distribute accurately the load power in the impedance mismatch condition.First,the traditional VSG model is illustrated in detail to ensure that VSG has the characteristics of SG.Then,two VSGs parallel operation model with different capacities is constructed and the key parameters match method of multi-VSGs parallel system is analyzed.Finally,a single VSG and two parallel VSGs are simulated to verify the effectiveness and feasibility of the proposed control strategy by MATLAB/Simulink.
作者
张展鹏
王辉
邾玢鑫
李晟
柏睿
ZHANG Zhanpeng;WANG Hui;ZHU Binxin;LI Sheng;BAI Rui(School of Electrical&New Energy,China Three Gorges Univ.,Yichang 443002,China;Hubei Institute of Microgrid Engineering Technology,China Three Gorges Univ.,Yichang 443002,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2020年第2期75-80,86,共7页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金项目(51707103)。
关键词
虚拟同步发电机
多机并联
虚拟阻抗
虚拟功率
功率分配
virtual synchronous generator
multi-VSGs parallel
virtual impedance
virtual power
power sharing
