摘要
以光伏阵列作为并网逆变器的前端输入,在三相光伏并网逆变器平均模型的基础上,考虑逆变器稳定运行点和光伏阵列特性对逆变器动态响应的影响,详细推导系统小信号模型的数学表达式,提出控制系统的模型和策略。研究表明光伏直流电压、光伏模块的跨导、电网电压和电网阻抗等参数的变化会影响控制系统稳定性和灵敏度,从而验证小信号模型的有效性,为光伏并网逆变器的动态响应分析和控制器设计提供重要的理论依据。
Considering the photovoltaic array as front end of grid-connected inverter and the effect of inverter operating point and photovoltaic array characteristics on its dynamic response,a detailed analytical expression of small signal model is deduced which based on the average model of three phase photovoltaic grid-connected inverter,and the model and the scheme of control system are put forward accordingly.The effect of electrical parameters variation as photovoltaic DC out-put voltage,photovoltaic array transconductance,grid voltage,grid inductance etc on system stability and sensitivity is analyzed,so the validity of small signal model is verified,which provide solid theoretical fundamentals for dynamic response analysis of photovoltaic grid-connected inverter and controller design.
出处
《电力电子技术》
CSCD
北大核心
2009年第11期18-20,共3页
Power Electronics
基金
国家自然科学基金资助项目(50667002)
新疆大学青年科研基金启动项目(QN070136)~~
关键词
逆变器
模型/光伏阵列
灵敏度
inverter
model / photovoltaic array
sensitivity
