摘要
低电压穿越控制是保证光伏发电系统安全稳定并网运行的技术难题之一,提出了一种改进型虚拟同步发电机控制方法,以实现光伏发电系统低电压穿越控制。该策略针对对称故障和不对称故障两种情况,加入了限幅环节,并通过超级电容器储能单元控制直流母线电压并吸收过剩功率。利用Matlab/Simulink仿真软件搭建了光伏发电系统的仿真模型,分别对对称故障和不对称故障情况下改进型虚拟同步发电机控制策略进行了仿真研究,仿真结果验证了所提出控制方法的有效性和可行性。
The low voltage ride - through control is one of the technical problems to ensure the safe and stable grid-connected operation of photovoltaic power generation system. An improved virtual synchronous generator control method is proposed to realize the low voltage ride - through control of photovoltaic power generation system. The strategy incorporates a limiter for both symmetrical and asymmetrical faults and controls the DC link voltage and absorbs excess power through the supercapacitor energy storage unit. The simulation model of photovoltaic power generation system is set up by using Matlab / Simulink simulation software. The control strategy of the improved virtual synchronous generator under symmetrical fault and asymmetrical fault is simulated respectively. The simulation results verify the effectiveness of the proposed control method and feasibility.
出处
《青海电力》
2017年第4期12-20,共9页
Qinghai Electric Power
基金
国家电网公司科研项目(5228001600DT)
国网青海省电力公司科技资助项目(522807160010)
关键词
虚拟同步机
超级电容器
光伏发电系统
储能系统
低电压穿越
virtual synchronous machine
supercapacitor
photovoltaic power generation system
energy storage system
low-voltage crossing
