基于伏-秒平衡特解规划的三电平中点电位低频脉动抑制PWM

doi:10.19595/j.cnki.1000-6753.tces.160286

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摘要基于伏-秒（V-S）平衡原理,提出一种通用程控三电平PWM方法,在单个载波周期内,设计一种通用的开关序列,其中每相开关序列均考虑三种不同电平,揭示三电平PWM算法可根据不同的控制目标对伏秒平衡方程特解进行规划来实现,物理意义更明晰。为了实现中点电位平衡与低频脉动抑制,解决虚拟电压矢量调制策略计算复杂的问题,以特解规划为基础,提出九段式低频脉动抑制PWM特解规划算法和中点电位闭环控制策略,给出了脉冲分配方法,无需扇区判定及矢量合成分析。建立中点钳位（NPC）三电平样机实验平台,采用阻感负载和永磁同步电机（PMSM）负载实验验证了所提方法的正确性和有效性。

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	刘毅
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关键词 ：三电平脉宽调制, 伏秒平衡, 特解规划, 低频脉动, 中点电位闭环控制

Abstract：A general programmed three-level PWM modulation algorithm was proposed in this paper based on the volt-second (V-S) balance principle. A general switch sequence was designed in a single period of carrier, where three different levels were considered in each phase switching sequence. According to the special solution plan of the V-S balance equations, different control objects of NPC three-level inverter are achievable through selecting different calculation criteria. Meanwhile, the modulation algorithm is greatly simplified, and has more clear physical meaning. On the purpose of achieving the neutral voltage balance and low frequency oscillations suppression, this paper puts forward the nine-segment special solution planning programmed PWM algorithm and the neutral voltage closed-loop control strategy based on the special solution plan to solve the problem of the calculating complexities in the virtual voltage vector modulation strategy simultaneously. The methods of special solution plan and pulse distribution are described in detail. The experiment was conducted on the NPC three-level prototype platform using inductance-resistance load and PMSM load. The results have proved the accuracy and effectiveness of the proposed algorithm.

Key words： Three-level PWM volt-second balance special solution plan low frequency oscillations the neutral voltage closed loop control

出版日期: 2017-10-10

PACS:

TM921

作者简介: 刘毅男,1987年生,博士,研究方向为电力电子变换器、电池管理及电机驱动系统。E-mail: flamepearlly@126.com（通信作者）;谭国俊男,1962年生,教授,博士生导师,研究方向为大功率交流传动及控制。E-mail: gjtan@cumt.edu.cn

引用本文:

刘毅, 谭国俊, 何晓群. 基于伏-秒平衡特解规划的三电平中点电位低频脉动抑制PWM[J]. 电工技术学报, 2017, 32(18): 152-161. Liu Yi, Tan Guojun, He Xiaoqun. Special Solution Planning Programmed PWM Algorithm for Three-Level Inverter Neutral Voltage Low Frequency Oscillations Suppression Based on V-S Balance Principle. Transactions of China Electrotechnical Society, 2017, 32(18): 152-161.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.160286 https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I18/152

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