中国电机工程学报2015，Vol.35Issue(11)：2822-2830,后插21,10.DOI:10.13334/j.0258-8013.pcsee.2015.11.021
基于载波移相调制的模块化多电平变换器变频运行控制
Variable Frequency Operation Control of Modular Multilevel Converter Based on Carrier Phase-shift Modulation
摘要
Abstract
Applying the modular multilevel converter (MMC) into medium-voltage/high-voltage high-power drive systems is an intrinsically challenging problem because the output voltage distortion is serious when the converter works at low frequency operation, as a result of the sub-module capacitor voltages fluctuations' aggravation. For this matter, a method of injecting the high frequency common mode voltages and the circulating currents was designed from the perspective of balancing the upper and lower arm powers dynamically based on the analysis of the mathematical model of a MMC. The carrier phase-shift technology was adopted in the drive system to reduce the switching frequency and losses. The implementations to make the phase voltage asN+1 and 2N+1 levels were discussed. By combining the carrier phase-shift modulation and low frequency operation sub-module capacitor voltage restraining method, a voltage control strategy along with its system architecture and implementation were presented for variable frequency operation. The proposed control strategy achieves the goal of balancing voltages in variable frequency operation and makes the MMC and motor work stably. At the same time, a satisfied output harmonic characteristic is acquired at low switching frequency. Finally, the constructed Matlab/Simulink simulation and experimental prototype verify the availability of the proposed control strategy at variable frequency operation.关键词
模块化多电平变换器/载波移相/变频/电压平衡/低开关频率Key words
modular multilevel converter (MMC)/carrier phase-shift/variable frequency/voltage balancing/low switching frequency分类
信息技术与安全科学引用本文复制引用
公铮,伍小杰,王钊,戴鹏..基于载波移相调制的模块化多电平变换器变频运行控制[J].中国电机工程学报,2015,35(11):2822-2830,后插21,10.基金项目
国家自然科学基金项目(51377160) （51377160）
江苏省普通高校研究生科研创新计划项目(KYLX_1384). Project Supported by National Natural Science Foundation of China (51377160) （KYLX_1384）
The Graduate Student Research and Innovation Program of Jiangsu Province (KYLX_1384). （KYLX_1384）
