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面向独立供电系统的四桥臂电流源变流器3D-SVPWM方法
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智能电网教育部重点实验室(天津大学),天津市 300072

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基金项目:

国家自然科学基金资助项目(51677129)。


Three-dimensional Space Vector Pulse Width Modulation Method of Four-leg Current-source Converter for Independent Power Supply System
Author:
Affiliation:

(Key Laboratory of the Ministry of Education on Smart Power Grids (Tianjin University), Tianjin 300072, China)

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51677129).

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    摘要:

    针对传统电流源变流器的调制方法无法实现三相四桥臂电流源变流器在不平衡负载下的三相电压平衡控制,且会有较高的共模电压的问题,提出了一种三相四桥臂电流源变流器的三维空间矢量脉宽调制(3D-SVPWM)方法,并将其应用于三相四线制独立供电系统。首先,定义了三维电流空间矢量,分析了不同电流空间矢量对应的共模电压。其次,提出了判断参考矢量所在四面体的方法。然后,通过优化空间矢量顺序,提出一种低开关动作次数下有效减小共模电压的空间矢量顺序。最后,实验表明所提3D-SVPWM方法能够实现三相四桥臂电流源变流器在不平衡负载下的三相电压平衡控制,且能有效降低共模电压。

    Abstract:

    The conventional modulation method of current-source converter cannot realize the three-phase voltage balance control of the three-phase four-leg current-source converter with unbalanced load, and has a high common-mode voltage. In view of the above problems, this paper proposes a three-dimensional space vector pulse width modulation (3D-SVPWM) method for the three-phase four-leg current-source converter, and applies it to a three-phase four-wire independent power supply system. Firstly, the three-dimensional current space vectors are defined, and the common-mode voltages corresponding to different current space vectors are analyzed. Secondly, this paper proposes a method for judging the tetrahedron where the reference vector is located. Thirdly, by optimizing the space vector sequence, this paper proposes a space vector sequence which can effectively reduce the common-mode voltage at low switching times. Finally, the experiments show that the proposed 3D-SVPWM method can achieve three-phase voltage balance control of three-phase four-leg current-source converter with unbalanced load, and effectively reduce the common-mode voltage.

    表 3 Table 3
    表 6 Table 6
    表 4 Table 4
    图1 三相四桥臂电流源逆变器拓扑Fig.1 Topology of three-phase four-leg current-source inverter
    图2 三相四桥臂电流源变流器的空间矢量图Fig.2 Space vector diagram of three-phase four-leg current-source converter
    图3 四面体T 1及其3个包围面Fig.3 Tetrahedron T 1 and its three enveloping surfaces
    图4 实验波形Fig.4 Experimental waveforms
    图 相邻空间矢量组成的四面体示意图Fig. Diagram of tetrahedrons composed of adjacent space vectors
    图 六个包围面示意图Fig. Diagram of six enveloping surfaces
    图 四面体T 2中有效矢量的开关状态Fig. Switching states of the effective vector in the tetrahedron T 2
    图 四面体T 2中不同空间矢量顺序Fig. Different space vector sequences in tetrahedron T 2
    图 四面体T 2中不同空间矢量顺序的共模电压Fig. Common-mode voltage of different space vector sequences in tetrahedron T 2
    图 采用3D-SVPWM方法的三相四桥臂电流源逆变器的控制框图Fig. Control block diagram of three-phase four-leg current-source inverter using 3D-SVPWM method
    图 采用2D-SVM方法的三相四桥臂电流源逆变器的控制框图Fig. Control block diagram of three-phase four-leg current-source inverter using 2D-SVM method
    图 不同调制策略的电流利用率分析示意图Fig. Schematic diagram of current utilization analysis of different modulation strategies
    图 负载平衡工况下不同调制策略仿真图Fig. Simulation diagram of different modulation strategies under load balancing conditions
    图 负载不平衡工况下不同调制策略仿真图Fig. Simulation diagram of different modulation strategies under load imbalance conditions
    图 不同负载不平衡度工况的仿真图Fig. Simulation diagram of different load imbalance conditions
    图 不同功率因数工况的仿真图Fig. Simulation diagram of different power factor conditions
    图 实验平台及实验电路示意图Fig. Experimental platform and experimental circuit diagram
    图 参考电流空间矢量轨迹Fig. Reference current space vector trajectory
    表 2 不同调制方法的性能比较Table 2 Performance comparison of different modulation methods
    表 5 Table 5
    表 7 Table 7
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引用本文

杨智彭,何晋伟,王成山.面向独立供电系统的四桥臂电流源变流器3D-SVPWM方法[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20191211002.
YANG Zhipeng,HE Jinwei,WANG Chengshan.Three-dimensional Space Vector Pulse Width Modulation Method of Four-leg Current-source Converter for Independent Power Supply System[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20191211002.

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  • 收稿日期:2019-12-11
  • 最后修改日期:2020-06-20
  • 录用日期:2020-05-06
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