Discontinuous current mode (DCM) with high‐frequency operation can be an effective way to reduce the volume of inductors for low‐power grid‐tied inverter applications. Unlike the controllers designed for continuous current mode operations, current controllers for DCM are required to address their nonlinear characteristics. A feed‐forward controller can be a good choice for the current control of the grid‐tied inverters operated in DCM. However, distortions in the output current cannot be eliminated, and they can be more severe if devices with large output capacitance are applied. Two harmonic current reduction strategies, namely a partial feedback path and an improved modulation, are proposed to reduce the low‐ and high‐order harmonics for single‐phase grid‐tied inverters operated in DCM. The proposed strategies are discussed and verified by a laboratory prototype in some experiments. It is indicated that the proposed modulation can mitigate the influence of device parasitic capacitance on current distortion and expand the device selections. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

中文翻译：

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降低以不连续电流模式运行的单相并网逆变器的谐波电流失真

高频工作的不连续电流模式（DCM）是减少低功率并网逆变器应用中电感器体积的有效方法。与专为连续电流模式操作而设计的控制器不同，要求用于DCM的电流控制器解决其非线性特性。对于在DCM中运行的并网逆变器的电流控制，前馈控制器可能是一个不错的选择。但是，无法消除输出电流中的失真，如果应用具有大输出电容的器件，则失真会更加严重。为了减少在DCM中运行的单相并网逆变器的低阶和高阶谐波，提出了两种降低谐波电流的策略，即部分反馈路径和改进的调制方式。在一些实验中，通过实验室原型讨论并验证了所提出的策略。结果表明，提出的调制方式可以减轻器件寄生电容对电流畸变的影响，扩大器件的选择范围。©2020日本电气工程师学会。由John Wiley＆Sons，Inc.发布