一种零序电压注入的T型三电平逆变器中点电位平衡控制方法

doi:10.19595/j.cnki.1000-6753.tces.181899

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摘要 T型三电平逆变器因其功率器件使用数量少、通态损耗低和功率密度高而被广泛应用于低压大电流领域。T型三电平逆变器的中点电位平衡控制是其关键技术之一,中点电位的不平衡将会导致输出电压和电流的谐波畸变率增加,且会降低直流侧电容的使用寿命。该文在传统的零序电压注入法基础上,研究了一种基于前馈加反馈补偿的零序电压注入,用以控制中点电位的平衡和抑制低频电压的脉动。通过建立T型三电平逆变器的开关函数模型和中点电位模型,详细分析了中点电位的平衡机理,推导了三相调制电压与注入零序电压之间的关系。该方法省去了复杂的占空比计算,可以实现中点电位平衡控制和低频电压脉动的抑制。最后通过实验验证了所提出的控制方法的正确性和有效性。

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	张建忠
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关键词 ： T型逆变器, 中点电位平衡, 开关函数模型, 电压脉动抑制, 零序电压注入

Abstract：Three-level T-type inverters are widely used in low-voltage and high-current fields due to small number of power devices, low switching losses, and high power density. The neutral potential balance control of the three-level T-type inverter is one of its key technologies. The imbalance of neutral potential will lead to an increase of harmonics in the output voltage and current, which will reduce the life of the dc-link capacitors. Based on the traditional zero-sequence voltage injection method, a zero-sequence voltage injection that combines feed-forward with feed-back compensation loops is studied to control the balance of neutral potential as well as the suppression of low-frequency voltage ripples. In this paper, by establishing the switching model and neutral potential model of three-level T-type inverter, the equilibrium mechanism of neutral potential is analyzed in detail, and then the relationship between three-phase modulation voltage and injected zero-sequence voltage is derived. This method avoids complicated duty cycle calculation, which can realize neutral potential balance control and suppression of low-frequency voltage ripple. The correctness and effectiveness of the proposed control method are verified by experiments.

Key words： T-type three-level inverter neutral potential balance switch model suppression of voltage ripples zero-sequence voltage injection

收稿日期: 2018-12-12 出版日期: 2020-02-28

PACS:

TM46

基金资助:国家自然科学基金(51577025)、江苏省智能电网技术与装备重点实验室课题资助

通讯作者: 张建忠男,1970年生,研究员,博士生导师,主要研究方向为新能源发电和电力电子技术。E-mail: jiz@seu.edu.cn

作者简介: 胡路才男,1995年生,硕士,研究方向为并网逆变器和谐波治理。E-mail: hulucai1@163.com

引用本文:

张建忠, 胡路才, 徐帅. 一种零序电压注入的T型三电平逆变器中点电位平衡控制方法[J]. 电工技术学报, 2020, 35(4): 807-816. Zhang Jianzhong, Hu Lucai, Xu Shuai. Neutral Potential Balance Control Method of T-Type Three-Level Inverter with Zero-Sequence Voltage Injection. Transactions of China Electrotechnical Society, 2020, 35(4): 807-816.

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