基于功率前馈的光伏并网控制方法及稳定性分析

发布时间：2018-12-15 18:41

【摘要】：针对光伏并网逆变器,提出了一种基于功率前馈的电压电流双环比例积分(proportional integral,PI)控制方法,电压外环实现逆变直流侧的电压稳定,内环追踪交流侧并网电流。在并网电流指令中,引入功率前馈环节,加快系统响应速度,减少直流电压的稳态误差。根据双闭环系统的波特图和根轨迹图,分析了系统在某区域范围内的稳定性。针对功率前馈环节,仿真对比了有无功率前馈对系统性能的影响。搭建了2kW的单相光伏并网发电平台,并对系统进行了性能测试。仿真与实验结果表明:系统能长期稳定可靠运行且能快速响应外界变化,并网电流畸变率为2.8%。该系统已成功应用到光伏建筑一体化(building integrated photovoltaic,BIPV)系统中,具有较强的工程实践价值。
[Abstract]:A voltage and current double loop proportional integral (proportional integral,PI) control method based on power feedforward is proposed for grid-connected photovoltaic inverter. The voltage outer loop achieves voltage stability on the DC side of the inverter and the inner loop tracks the AC side grid-connected current in the inner loop. In the grid-connected current instruction, power feedforward is introduced to speed up the system response and reduce the steady-state error of DC voltage. The stability of the system in a certain region is analyzed according to the Porter graph and the root locus diagram of the double closed loop system. The effect of power feedforward on system performance is simulated and compared. A single phase photovoltaic grid-connected generation platform based on 2kW is built, and the performance of the system is tested. The simulation and experimental results show that the system can run stably and reliably for a long time and can respond to external changes quickly. The distortion rate of current connected to the grid is 2.8%. The system has been successfully applied to the integrated (building integrated photovoltaic,BIPV system of photovoltaic buildings and has strong practical value.
【作者单位】：湖南大学电气与信息工程学院;湖南省电力公司科学研究院;
【基金】：国家重点基础研究发展计划项目(973项目)(2009CB219706) 中国与欧洲政府间国际合作计划项目(2010DFA61640)~~
【分类号】：TM615

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