Abstract
A voltage balance control strategy based on the fuzzy adaptive PI (Proportional Integral control) is proposed to address the problem of unbalanced capacitor voltage on the DC side of cascaded H-bridge static var generators (SVG). In the control strategy, fuzzy control is introduced based on PI control. A duty ratio correction is added to all levels’ public active power duty ratios, thereby realizing the balance of DC-side voltages at all levels. A test was conducted by building a single-phase three-H-bridge unit cascaded SVG simulation platform. The results show that the DC-side voltage balance can be controlled by the voltage balance control strategy at all levels effectively. It has the advantages of a simple control structure, double closed-loop control with decoupling of the system’s current DQ, no coupling effect, a fast response speed, and high precision. The voltage balance control strategy can exert a good control effect when the system experiences a sudden voltage imbalance.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Guangxi Province, China
Subject
Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering
Reference22 articles.
1. Enhancing Inductive Operation of Low-Capacitance Cascaded H-Bridge StatComs Using Optimal Third-Harmonic Circulating Current;Rodriguez;IEEE Trans. Power Electron.,2021
2. Flexible Third Harmonic Voltage Control of Low Capacitance Cascaded H-Bridge STATCOM;Ge;IEEE Trans. Power Electron.,2018
3. Low-Capacitance StatCom With Modular Inductive Filter;Farivar;IEEE Trans. Power Electron.,2019
4. DC voltage control of small capacitance cascade STATCOM under imbalance;Xia;Power Electron. Technol.,2021
5. Tao, X., Li, Y., and Sun, M. (2010, January 1–3). A novel voltage balance method for cascaded H-bridge rectifier. Proceedings of the 2010 IEEE Vehicle Power and Propulsion Conference, Lille, France.