基于Buck-Boost电路的三电平逆变器中点平衡控制研究

针对二极管箝位式三电平逆变器中点电压不平衡问题,通过分析产生中点电压偏移的原因,采用基于Buck-Boost电路的中点电压平衡方法,并对该平衡电路提出一种PI控制策略。分别对常规小矢量调节法和Buck-Boost电路平衡法进行了研究和分析,仿真结果表明Buck-Boost电路平衡方法及控制策略可有效抑制中点电压偏移,并在高调制比和小电容情况下,电压平衡效果优于常规小矢量调节法。...

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Bibliographic Details
Published in电测与仪表 Vol. 54; no. 19; pp. 79 - 83
Main Author 张韬 赵涛 徐友 季宁一
Format Journal Article
LanguageChinese
Published 南京工程学院电力工程学院,南京,211167%南京工程学院自动化学院,南京,211167 2017
Subjects
三电平逆变器
中点电压平衡
控制策略
空间矢量调制
空间矢量调制
neutral-point-voltage balance
control strategy
三电平逆变器
three-level inverter
SVPWM
控制策略
中点电压平衡
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ISSN1001-1390

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Summary:针对二极管箝位式三电平逆变器中点电压不平衡问题,通过分析产生中点电压偏移的原因,采用基于Buck-Boost电路的中点电压平衡方法,并对该平衡电路提出一种PI控制策略。分别对常规小矢量调节法和Buck-Boost电路平衡法进行了研究和分析,仿真结果表明Buck-Boost电路平衡方法及控制策略可有效抑制中点电压偏移,并在高调制比和小电容情况下,电压平衡效果优于常规小矢量调节法。
Bibliography:Zhang Tao1 , Zhao Tao2, Xu You2, Ji Ningyi1 （1. School of Electric Engineering Nanjing Institute of Technology, Nanjing 211167, China. 2. School of Automation, Nanjing Institute of Technology, Nanjing 211167, China）
23-1202/TH
three-level inverter, SVPWM, neutral-point-voltage balance, control strategy
In the study of three-level inverter, due to the unbalance of neutral-point-voltage, resulting in the output waveform distortion, which made the inverter can＇ t meet the operational requirements. For this, the diode clamped three-level inverter causes neutral-point-voltage unbalance is analyzed in this paper, and a control strategy based on the Buck-Boost balance circuit is presented, which is verified by MATLAB/Simulink. Meanwhile, the traditional small vector adjustment method and the Buck-Boost circuit balance method are studied and analyzed respectively. The simulation results show that the control strategy presented in this paper for the Buck-Boost balance circuit can effec- tively suppress the unbalance of n
ISSN:1001-1390