计及功率极性和序列连续性的三电平闭环虚拟矢量调制策略  

Feedback control of neutral point voltage deviation for three level converter considering power flow polarity and switch pattern continuity

作　　者：李文善 温旭辉[1,2,3,4] 张剑[1,2,3,4] 王又珑 LI Wen-shan;WEN Xu-hui;ZHANG Jian;WANG You-long(School of Electronic,Electrical and Commutation Engineering,University of Chinese Academy of Science,Beijing 100049,China;Institute of Electrical Engineering,Chinese Academy of Science,Beijing 100190,China;Qilu Zhongke Electric Advanced Electromagnetic Drive Technology Research Institute,Shandong 250100,China;Key Laboratory of Power Electronics and Electric Drive,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院大学电子电气与通信工程学院,北京100049 [2]中国科学院电工研究所,北京100190 [3]齐鲁中科电工先进电磁驱动技术研究院,山东250100 [4]中国科学院电力电子和电气驱动重点实验室,北京100190

出　　处：《电机与控制学报》2022年第2期10-23,共14页Electric Machines and Control

基　　金：国家重大研发计划项目(2016YFB0100600);北京市自然科学基金(3192041)。

摘　　要：针对三电平变流器应用于大功率高速航空起动发电机系统所产生的中点电位偏差问题,提出一种考虑起动发电两种功率极性和开关序列连续性的中点电位偏差闭环虚拟空间矢量调制策略。建立了三电平变流器输出电压序列的中点电荷模型,据此分析了低载波比工况下虚拟空间矢量调制策略及闭环虚拟空间矢量调制策略下中点电位不平衡问题。在传统虚拟空间矢量调制策略输出开关序列中引入闭环调节系数用以调节开关序列输出的中点电荷极性,从而实现中点电位偏差可控。通过对闭环调节系数的合理设计可实现开关序列连续,进而降低线电压和相电流的畸变。建立了高速永磁同步电机起动发电机仿真模型,对比了传统方法与所提方法在中点平衡能力和电流畸变方面的性能。搭建了阻感负载和高速永磁同步发电机(30000 r/min)测试平台验证了所提方法的有效性。In order to solve the neutral point voltage unbalance problem of three-level converters when they are applied to high-power high-speed starter generator(S/G) control system for aircraft, an improved closed-loop virtual space vector modulation strategy is proposed, which considers power polarities of S/G and continuity of switching patterns. The neutral point charge models of the three-level converter for switching patterns under different situation were established, and the neutral point voltage unbalance problems under the conventional and the closed-loop virtual space vector modulation strategy were analyzed. A closed-loop coefficient was introduced into the switching patterns to modify the neutral-point charge. Further, the neutral-point voltage can be regulated by the closed loop coefficient. The continuous switching patterns can be realized by proper design of the closed-loop coefficient. Therefore, the distortion of line voltage and phase current can be reduced. A simulation model of high-speed permanent magnet synchronous motor(PMSM) starter generator was established. By doing that, the performance of the conventional method and the proposed method in neutral point voltage balance capability and current distortion rate was compared. A test platform for resistive load and high-speed generator(30 000 r/min) was built to verify the effectiveness of the proposed method.

关 键 词：高速起动发电机 三电平变流器 虚拟空间矢量 功率流极性 低载波比 中点电位平衡 开关序列连续性 

分 类 号：TM46[电气工程—电器]