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基于Sigmoid函数的级联变换器前馈电流纹波建模及稳定性分析

Sigmoid Function–Based Discontinuous Feedforward Current Ripple Modeling for Stability Analysis of Cascaded Converter

语言:

中文摘要

级联变换器在源端与负载端变换器的开关纹波相互作用下,表现为具有多个开关状态序列的高阶系统,这阻碍了对前馈电流纹波(FCR)稳定性影响的研究。本文提出一种基于Sigmoid函数的建模方法,克服了传统傅里叶级数法在分析不连续开关纹波时的局限性,为级联系统的稳定性分析提供了更精确的数学工具。

English Abstract

The cascaded converter, under the switching ripple interaction between source and load converters, can be described as a high-order system with multiple switching state sequences (SSSs). This poses a hindrance to investigating the stability effects of feedforward current ripple (FCR). In general, replacing FCR with a finite Fourier series can remove this hindrance. However, this method has limitat...
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SunView 深度解读

该研究针对级联变换器(如光伏组串式逆变器与DC/DC优化器级联,或储能系统中的多级变换架构)的稳定性问题,提出了更精确的纹波建模方法。对于阳光电源的组串式逆变器及PowerTitan/PowerStack储能变流器产品线,该技术有助于优化多级变换架构下的控制环路设计,特别是在弱电网环境下,能有效提升系统对开关纹波的抑制能力,减少谐振风险,从而提升产品并网的稳定性和电能质量。建议研发团队将其引入仿真平台,用于评估复杂拓扑下的系统稳定性。