基于下垂控制的光伏系统低电压穿越研究
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摘要
分析光伏并网逆变器的拓扑结构原理,建立了数学模型。具体地,分析逆变器坐标变换过程,通过控制变换后的DQ坐标的量控制逆变器。在传统电压外环和电流内环中,增加Droop环节,以精准控制无功。电网发生故障时,向电网稳定输送无功功率,以达到低电压穿越的目的。通过MATLAB软件仿真,验证了其可行性。
The topological structure principle of grid-connected photovoltaic inverters is analyzed,and the mathematical model is established. Specifically,the process of coordinate transformation of inverters is analyzed,and the inverters are controlled by controlling the amount of DQ coordinates transformed. Droop link is added to the traditional voltage outer loop and current inner loop to precisely control reactive power. When the power grid fails,the reactive power is stably transmitted to the power grid to achieve the purpose of low voltage crossing. The feasibility is verified by the simulation of MATLAB software.
The topological structure principle of grid-connected photovoltaic inverters is analyzed,and the mathematical model is established. Specifically,the process of coordinate transformation of inverters is analyzed,and the inverters are controlled by controlling the amount of DQ coordinates transformed. Droop link is added to the traditional voltage outer loop and current inner loop to precisely control reactive power. When the power grid fails,the reactive power is stably transmitted to the power grid to achieve the purpose of low voltage crossing. The feasibility is verified by the simulation of MATLAB software.
引文
[1]陈亚爱,刘劲东,周京华.太阳能并网逆变器故障穿越控制策略[J].中国电机工程学报,2014,34(21):3405-3412.
[2]沈欣炜,郑竞宏,朱守真,等.光伏并网逆变器参数的DQ轴解耦辨识策略[J].电力系统自动化,2014,38(4):38-43.
[3]金宇清,鞠平,潘学平,等.光伏逆变器控制参数的分步识别方法[J].电网技术,2015,39(3):594-600.
[4]郑飞,张军军.基于RTDS的光伏发电系统低电压穿越建模与控制策略[J].电力系统自动化,2012,36(22):19-24.
[5]CAMACHO A,CASTILLA M,MIRET J,et al.Active and Recative Power Strategies with Peak Current Limitation for Distributed Generation Inverters During Unbalanced Grid Faults[J].IEEE Transactions on Industrial Electronics,2015,62(3):1515-1525.
[6]汪小平,李阳.微电网运行控制与仿真[J].中国电力,2014,44(22):73-77.
[7]Rodriguez P,Luna A,Candela I,et al.Multiresonant Arequency-locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions[J].IEEETransactions on Industrial Electronics,2013,58(1):127-138.
[2]沈欣炜,郑竞宏,朱守真,等.光伏并网逆变器参数的DQ轴解耦辨识策略[J].电力系统自动化,2014,38(4):38-43.
[3]金宇清,鞠平,潘学平,等.光伏逆变器控制参数的分步识别方法[J].电网技术,2015,39(3):594-600.
[4]郑飞,张军军.基于RTDS的光伏发电系统低电压穿越建模与控制策略[J].电力系统自动化,2012,36(22):19-24.
[5]CAMACHO A,CASTILLA M,MIRET J,et al.Active and Recative Power Strategies with Peak Current Limitation for Distributed Generation Inverters During Unbalanced Grid Faults[J].IEEE Transactions on Industrial Electronics,2015,62(3):1515-1525.
[6]汪小平,李阳.微电网运行控制与仿真[J].中国电力,2014,44(22):73-77.
[7]Rodriguez P,Luna A,Candela I,et al.Multiresonant Arequency-locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions[J].IEEETransactions on Industrial Electronics,2013,58(1):127-138.