Research on the Mechanism of Neutral-point Voltage Fluctuation and Capacitor Voltage Balancing Control Strategy of Three-phase Three-level T-type Inverter

被引：4

作者：

Yan, Gangui ^{[1
]}

Duan, Shuangming ^{[1
]}

Zhao, Shujian ^{[1
]}

Li, Gen ^{[2
]}

Wu, Wei ^{[1
]}

Li, Hongbo ^{[1
]}

机构：

[1] Northeast Elect Power Univ, Sch Elect Engn, Jilin, Jilin, Peoples R China

[2] Cardiff Univ, Cardiff, S Glam, Wales

来源：

JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY | 2017年 / 12卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Fluctuation characteristics; Mechanism of neutral-point voltage fluctuation; T-type three-level inverter; Voltage difference feed-forward balancing control; MODULATION STRATEGY; CONVERTERS; SYSTEMS; PWM;

D O I：

10.5370/JEET.2017.12.6.2227

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In order to solve the neutral-point voltage fluctuation problem of three-phase threelevel T-type inverters (TPTLTIs), the unbalance characteristics of capacitor voltages under different switching states and the mechanism of neutral-point voltage fluctuation are revealed. Based on the mathematical model of a TPTLTI, a feed-forward voltage balancing control strategy of DC-link capacitor voltages error is proposed. The strategy generates a DC bias voltage using a capacitor voltage loop with a proportional integral (PI) controller. The proposed strategy can suppress the neutral-point voltage fluctuation effectively and improve the quality of output currents. The correctness of the theoretical analysis is verified through simulations. An experimental prototype of a TPTLTI based on Digital Signal Processor (DSP) is built. The feasibility and effectiveness of the proposed strategy is verified through experiment. The results from simulations and experiment match very well.

引用

下载

页码：2227 / 2236

页数：10

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