Han Xixi, Xu Bowen, Kang Keqi, Zuo Songwei
School of Electronic and Information Engineering, Zhongyuan University of Technology, Zhengzhou, China.
Sci Prog. 2023 Oct-Dec;106(4):368504231208520. doi: 10.1177/00368504231208520.
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.
并网逆变器是确保发电系统稳定、可靠、安全和高效运行的关键；并网输出电流波形的质量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并降低其输出电流谐波含量，本文设计了一种将重复控制（RC）和自抗扰控制（ADRC）相结合的改进控制策略。首先，对自抗扰控制进行解耦，实现控制器跟踪性能参数与抗干扰性能参数之间的独立适配，从而降低参数调整难度。其次，通过在自抗扰控制中加入重复控制来设计控制方法。为了验证本文所提方法的有效性，在正常电网、弱电网和周期性干扰条件下，分别采用比例积分控制、传统自抗扰控制和本文所提方法进行了详细的实验研究。并进行了动态性能仿真实验，以验证加入重复控制环节前后自抗扰控制器的动态性能。结果表明了所提方法的有效性和可行性。最后，在硬件测试平台上进行了仿真后的稳态和动态性能实验。所得结果的影响表明了所提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，并降低了输出电流的谐波含量。
