Work

A General Discrete Model and Dynamic Characteristic Analysis of the N ‐Cell Cascaded H‐Bridge Inverter With an LC Filter

Year: 2025

Type: article

Abstract: ABSTRACT This paper addresses the modeling challenges in analyzing dynamic characteristics of cascaded H‐bridge inverters with LC filters, where second‐order nonhomogeneous differential equations cannot be fully solved using the virtual traversal method alone. By combining virtual traversal with discrete mapping modeling, a general‐purpose mathematical model is established for systems using quasiproportional resonance control in the voltage outer loop and proportional regulation in the current inner loop. The influences of key parameters—control parameters, cascade unit number N , DC voltage E , filter components L and C , and frequencies f s and f 1 —on bifurcation and chaotic behavior are systematically analyzed. An improved exponential delayed feedback control method is proposed, which expands the system's parametric stability domain by more than twofold and reduces the total harmonic distortion from 18.72% to 3.89%. The theoretical findings are validated through bifurcation diagrams, phase portraits, PSIM simulations, and experimental results.

Source: International Journal of Circuit Theory and Applications

DOI: 10.1002/cta.70218

Authors: Yang Weiman, Wang Fuqiang, Li Jinjian, Wang Xinggui, Zheng Shaohui, Zhang Yupei

Institution: Lanzhou University of Technology

Language: English

Topic: Multilevel Inverters and Converters

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: bronze

Funder: National Natural Science Foundation of China

Award: 混杂环境下微电网群三相失衡机理及其主动抑制方法的研究