摘要
针对电网电压跌落造成的电网不稳定运行,以抑制光伏并网逆变器输出过电流为控制目标,提出了基于无功支撑的LVRT技术。在对光伏并网逆变器建模和分析双闭环控制策略的基础上,建立了逆变器输出无功电流和电压跌落深度的关系,电网电压跌落时,通过对有功、无功电流的协调控制,实现LVRT,输出无功支撑电网电压恢复,增强了并网系统的稳定性。Simulink仿真研究验证了该LVRT技术的有效性和可行性。
Aiming at the grid′s instability causing by voltage dips,a low voltage ride through technology based onsupport of reactive power was proposed to restrain over-current of photovoltaic grid-connected inverters. PV inverter′smodeling was set and double closed-loop control strategy was analyzed,based on which built the relationship betweeninverter′s reactive current and amplitude of grid voltage dips. Coordinated reactive and active current when voltagedips occured. Thus,provided reactive power support to the grid,realized low voltage ride through of PV connectedinverters and enhanced stability of the grid-connected system. Simulink simulation results show the effectiveness andfeasibility of the technology.
出处
《电气传动》
北大核心
2016年第2期26-30,共5页
Electric Drive
基金
国家自然科学基金资助项目(51167015)
科技部国际合作项目(2011DFA11780)
关键词
光伏并网逆变器
电压跌落
低电压穿越
SIMULINK仿真
photovoltaic grid-connected inverter
voltage dip
low voltage ride through(LVRT)
Simulink simulation
