This article proposes an improved odd-harmonic repetitive controller (IORC) for a Ćuk-derived inverter. The IORC is composed of a modified structure of an odd-harmonic repetitive controller (ORC) combined with a proportional-integral (PI) controller and a feedforward controller to achieve a zero steady-state error in the Ćuk-derived inverter. The IORC features much larger gains at odd-harmonic frequencies by modification of an existing ORC, so both its convergence rate and transient response become much faster. The added benefit of using the IORC is that it has wider bandwidth at odd-harmonic frequencies, so it is more insensitive to the grid frequency fluctuation. The IORC also adopts a linear phase-lead compensator to compensate for the phase lag of the Ćuk-derived inverter. Hence, the IORC can effectively eliminate the odd-harmonic components in the output current of the grid-connected Ćuk-derived inverter while using less memory space. However, the distinctive structure of the IORC makes it difficult to guarantee the stability of the overall control system. Thus, in this article, a new stability analysis method is developed for the IORC system, and then a practical design guideline is also provided to obtain the optimal control parameters. Experimental results are presented to validate the proposed controller in the 300-W Ćuk-derived inverter prototype.

中文翻译：

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Cuk衍生逆变器改进奇次谐波重复控制方案


本文提出了一种用于 Ćuk 衍生逆变器的改进奇次谐波重复控制器 (IORC)。 IORC 由奇次谐波重复控制器 (ORC) 的改进结构与比例积分 (PI) 控制器和前馈控制器相结合，以实现 Ćuk 衍生逆变器的零稳态误差。通过修改现有的 ORC，IORC 在奇次谐波频率下具有更大的增益，因此其收敛速度和瞬态响应都变得更快。使用 IORC 的额外好处是它在奇次谐波频率下具有更宽的带宽，因此对电网频率波动更不敏感。 IORC还采用线性相位超前补偿器来补偿Ćuk衍生逆变器的相位滞后。因此，IORC可以有效地消除并网Ćuk衍生逆变器输出电流中的奇次谐波分量，同时使用更少的存储空间。然而IORC独特的结构使其难以保证整个控制系统的稳定性。因此，本文为IORC系统开发了一种新的稳定性分析方法，并提供了实用的设计指南以获得最佳控制参数。实验结果旨在验证 300W Ćuk 衍生逆变器原型中所提出的控制器。