一种并网逆变器功率跟踪控制策略研究

Research on the Power Tracking Control Strategy of PV Grid-connected Inverter

分析了一种并网逆变器的功率跟踪控制方案。由于采用自抗扰控制器(ADRC),输出电流能够很好地跟踪电网电压,并能实现最大功率点跟踪(MPPT)。通过对电流的闭环跟踪控制,实现了单位功率因数运行,并向电网馈送电能。实验表明,采用ADRC,稳定快速,输出电流超调小,能够有效地抑制各种扰动,且启动性能与稳定性能都要优于常规控制器。

A power tracking control scheme of PV grid-connected inverter is presented.Due to the utilization of intelli- gent controller（ADRC）,the output current can track gird voltage effectively and can realize the maximum power point tracking （MPPT）.The inverter can achieve the unity power factor operation and feed electricity to the grid by closed- loop current control.Experiments show that using ADRC can effectively inhibit a variety of disturbances with high speed.The performance of start-up and stability are also superior to conventional controllers.