第二届东南大学“研究生学报杯”论文排版大赛初赛论文.docx

五相三电平电压源型逆变器开关策略设计张三，李四东南大学电气工程学院，南京，210096摘 要：本文以中压大功率交流电机驱动为背景，提出一种新型基于矢量空间解耦（VSD）的五相中点箝位型（NPC）三电平空间矢量调制策略（SVM）。其中，VSD矩阵将五维变量解耦并映射到两个二维平面和一个一维直线，即-平面、x-y平面及o-o平面；矢量精简原则使矢量数量从243个简化到113个；最优五矢量法（OFV）消除了x-y平面的谐波电压；矢量作用次序优化最小化开关损耗和平衡直流侧中点电位；区域投影法提高了参考矢量位置判断效率。本文提出的SVM策略设计方法同样适用于其它多电平多相SVM策略设计。最后，论文通过实验验证了上述策略的有效性。关键词：矢量空间解耦；中点箝位；三电平五相；最优五矢量；空间矢量调制Design of a Vector Space Decomposition Based Space Vector Modulation Strategy for Three-Level Five-Phase InvertersZhang San, Li SiSchool of Electrical Engineering Southeast University, Nanjing, 210096Abstract: This paper presents a novel vector space decomposition (VSD) space vector modulation (SVM) strategy for neutral point clamped (NPC) three-level five- phase inverter, which could be used in high-power electric drives. Firstly, the five-dimensional variables are decoupled into two dual-dimensional spaces and a one-dimensional line, namely (-( space, x-y space and o-o line. A vector simplified principle is proposed to reduce the number of original vector from 243 to 113, and the optimal five vectors (OFV) technique eliminates harmonic voltage in x-y space. Meanwhile, the optimal vector operational order not only balances neutral point voltage effectively, but also minimizes switching loss. The method of region projection improves the judgment efficiency of voltage reference vector in complex region. The proposed design procedure could also be used for other multilevel multiphase NPC inverters. Finally, the experimental results are given to verify theoretical developments.Key words: vector space decomposition (VSD); neutral point clamped (NPC); three-level five-phase; optimal five vectors (OFV); space vector modulation1 引言多相交流电机自问世以来就受到了广泛的关注，因其在大功率高可靠性应用场合的突出优势[1]。众多学者对其在大功率交流驱动场合的应用做出了卓有成效的研究[2-4]。其中，文献[2]首次提出矢量空间解耦(VSD）思想，将多相电机的机电量和非机电量解耦变换到多个相互正交的二维平面，为多相电机分析和控制提供了理论基础。文献[3]设计了基于五相逆变器的最近四矢量SVM（NFV-SVM），但没有认识到多相SVM设计的谐波抑制问题。同时，多电平逆变器技术也在快速发展。1981年日本学者Nabae提出中点箝位型（NPC）三电平逆变器拓扑结构[5]，该拓扑使得开关器件承受的关断电压为母线电压一半，目前已成为中压交流驱动领域的首