输入电压不平衡时三相脉冲阻塞式交交变频研究

doi:10.16180/j.cnki.issn1007-7820.2020.11.006

摘要/Abstract

摘要：

为充分体现交交变频调速性能的优势,文中在传统电压平衡情况下脉冲阻塞式交交变频原理的基础上,提出了一种输入电压不平衡时的三相脉冲阻塞式交-交变频系统。通过对阻塞后斩波控制的理论分析,采用全控型功率器件,根据面积等效原理推导出了每个区间对应的占空比表达式。文中实现了输入电压不平衡情况下输出电压的变频调幅,使变频调速系统达到平衡状态时的运行效果。最后,搭建了输入电压不平衡时的三相脉冲阻塞式变频调速系统数学模型,设计了半实物仿真平台。仿真结果与平衡条件下的结果一致,证明了理论分析的可行性。

关键词: 电压不平衡, 脉冲阻塞, 交交变频, PWM控制, 调速系统, MATLAB仿真

Abstract:

To fully realize the advantages of AC-AC variable frequency speed regulation performance, based on the principle of pulse blocking AC-AC frequency conversion under the traditional voltage balance, a three-phase pulse blocking type AC-AC is proposed when the input voltage is unbalanced. Through the theoretical analysis of the chopping control after blocking, fully-controlled power devices are used, and the duty cycle expression corresponding to each interval is derived according to the area equivalent principle. The frequency conversion amplitude modulation of the output voltage under the condition of unbalanced input voltage is realized, which make the frequency conversion speed control system achieved the running effect when it is in equilibrium. Finally, the mathematical model of three-phase pulse blocking type variable frequency speed control system with unbalanced input voltage is established, and a semi-physical simulation platform is designed. The simulation results are consistent with the results under equilibrium conditions, which proves the feasibility of theoretical analysis.

Key words: voltage imbalance, pulse blocking, AC-AC frequency conversion, PWM control, speed control system, MATLAB simulation

中图分类号:

TN715

李玉东,胡晓丹,连海山. 输入电压不平衡时三相脉冲阻塞式交交变频研究[J]. 电子科技, 2020, 33(11): 31-35.

LI Yudong,HU Xiaodan,LIAN Haishan. Three-phase Pulse Blocking Type AC-AC Frequency Conversion When Input Voltage is Unbalanced[J]. Electronic Science and Technology, 2020, 33(11): 31-35.

图/表 10

图1

图2

图3

图4

表1

半个周期输入输出电压对应"

输入电压V	输出电压V_out
V₁=V_im1sin $2 π f i t$	V_out₁=U_omsin $2 π f 2 t 0$
V₂=V_im2sin $2 π f i t - 2 π 3$	V_out₂=U_omsin $2 π f 2 t 0 - 2 π 3$
V₃=V_im3sin $2 π f i t - 4 π 3$	V_out₃=U_omsin $2 π f 2 t 0 - 4 π 3$

表1

表2

图5

图6

图7

图8

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