并网逆变器是保证稳定的关键,可靠,安全,和发电系统的高效运行;并网输出电流波形的好坏直接影响整个发电系统的性能。为了提高并网逆变器的抗干扰性能,降低输出电流谐波含量,本文设计了一种结合重复控制(RC)和自抗扰控制(ADRC)的改进控制策略。首先,解耦控制器,实现控制器的跟踪性能参数和抗干扰性能参数之间的自适应,降低了参数调整的难度。其次,控制方法是通过在ADRC基础上增加RC来设计的。为了证明本文方法的有效性,使用比例积分控制进行了详细的实验研究,传统的ADRC,和所提出的方法在正常电网下,弱电网,和周期性的干扰。并进行了动态性能仿真实验,验证了自抗扰控制器在加入RC环节前后的动态性能。结果表明了该方法的有效性和可行性。最后,模拟后,在硬件测试平台上进行稳态和动态性能测试。得到的结果的影响表明了所提出的控制算法的有效性和可行性,提高了抑制中频干扰的能力,扩展了自抗扰控制器的带宽,并且降低了输出电流的谐波含量。
The grid-connected inverter is the key to ensure stable, reliable, safe, and efficient operation of the power generation system; the quality of the grid-connected output current waveform directly affects the performance of the entire power generation system. To improve the anti-interference performance and reduce the output current harmonic content of the grid-connected inverter, an improved control strategy that combined repetitive control (RC) and auto disturbance rejection control (ADRC) is designed in this paper. Firstly, decoupled the ADRC to realize the individual adaptation between tracking performance parameters and anti-interference performance parameters of the controller, through which the difficulty of adjusting parameters is reduced. Secondly, the control approach is devised by adding RC to ADRC. To demonstrate the effectiveness of the proposed method in this paper, detailed experimental studies are conducted using proportional integral control, traditional ADRC, and the proposed method under normal power grids, weak power grids, and periodic disturbances. And dynamic performance simulation experiment is done to verify the dynamic performance of the self-disturbance rejection controller before and after the addition of RC links. The results indicated the effectiveness and feasibility of the proposed method. Finally, after simulation, the steady state and dynamic performance are conducted on a hardware testing platform. The impacts of the obtained results indicate the effectiveness and feasibility of the control algorithm proposed, the ability to suppress intermediate frequency disturbances is improved, the bandwidth of the auto disturbance rejection controller is expanded, and the harmonic content of the output current is depressed.