Parallel dc–dc converters are commonplace in applications such as computing power supplies, point of load systems, and dc microgrids. The presence of multiple converters in such systems allows for switch interleaving and ripple cancellation. One class of existing ripple reduction methods depends on central controllers that require communication among the converters. These approaches compromise system scalability and reliability. When it comes to decentralized methods, the state-of-the-art is limited to uniform conditions and cannot handle mismatches in physical parameters and operating points among converters. In this article, we address these shortcomings with fully decentralized controller that robustly drives the pulsewidth modulation carriers of a collection of heterogeneous converters to the phase-shifts that give minimized ripple. More precisely, the proposed controller eliminates the dominant fundamental switching harmonic from the output current and voltage using only local voltage feedback. After outlining a comprehensive analytical model, we experimentally validate our approach on a system of five parallel-connected buck converters under a variety of parametric and operational mismatches. Measurements show ripple reduction of more than $4\times$ in the output voltage and the fundamental switching frequency harmonic is attenuated by more than 30 dB compared to conventional symmetric interleaving.

中文翻译：

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并联 DC-DC 转换器中完全分散纹波最小化的实用数字化实现

并联直流-直流转换器在计算电源、负载点系统和直流微电网等应用中很常见。在此类系统中存在多个转换器允许开关交错和纹波消除。一类现有的纹波降低方法依赖于需要转换器之间通信的中央控制器。这些方法损害了系统的可扩展性和可靠性。对于分散式方法，最新技术仅限于统一条件，无法处理转换器之间物理参数和工作点的不匹配。在本文中，我们通过完全分散的控制器解决了这些缺点，该控制器可将一组异构转换器的脉宽调制载波稳健地驱动到相移，从而使纹波最小化。更准确地说，所提出的控制器仅使用本地电压反馈从输出电流和电压中消除了主要的基波开关谐波。在概述了一个综合分析模型之后，我们在一个由五个并联连接的降压转换器组成的系统上在各种参数和操作不匹配的情况下通过实验验证了我们的方法。测量显示纹波减少超过$4\次$与传统的对称交错相比，输出电压和基波开关频率谐波衰减超过 30 dB。