A Space Vector Modulation Scheme for Three-level ANPC Inverters With Neutral-point Potential Balancing and Switching Loss Reduction
胡存刚1, 芮涛2, 马大俊1, 王群京1, 罗方林3
1.安徽大学电气工程与自动化学院,安徽省 合肥市 230601
2.安徽省工业节电与电能质量控制协同创新中心,安徽省 合肥市 230601
3.南洋理工大学电气电子工程学院,新加坡 639798
HU Cungang1, RUI Tao2, MA Dajun1, WANG Qunjing1, LUO Fanglin3
1. School of Electrical Engineering and Automation, Anhui University, Hefei 230601, Anhui Province, China
2. Anhui Provincial Collaborative Innovation Center for Industrial Energy Saving and Power Quality Control, Anhui University, Hefei 230601, Anhui Province, China
3. School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
基金项目:
国家自然科学基金项目(51307002);
安徽省高校自然科学研究重大项目(KJ2016SD02);
Project Supported by National Natural Science Foundation of China (51307002);
College and University Major Natural Science Foundation of Anhui Province (KJ2016SD02);
The active neutral point clamped (ANPC) topology enable additional switch states and commutations compared to the neutral point clamped (NPC) topology. ANPC topology can overcome disadvantages of unequal semiconductor loss distribution in NPC topology. This paper investigated the control strategy of the neutral-point potential (NP) balancing and the switching loss (SL) reduction for three-level ANPC inverters. An novel three-level space vector pulse width modulation (SVM) was proposed to control the NP imbalance and to reduce the SL simultaneously. The novel virtual medium vectors were redefined, which were synthesized by the original medium vector and the adjacent two pairs of small vectors. Therefore, using the proposed VSVM, there are two pairs of small vectors in any region of the space vector diagram, which one pair of small vectors can be used to control the NP, and another pair of small vectors can be used for reducing the SL. The coordinately selected small vectors consider both the NP charge and the pulse sequence, so that the minimized NP ripple and switching events are guaranteed in one switching cycle. The simulation and experimental results are provided to verify the effectiveness of the proposed control strategy.
KEY WORDS :three-level inverter;active neutral point clamped;virtual space vector;neutral-point potential balancing;switching loss reduction;
0 引言
多电平拓扑结构具有输出容量大和谐波含量少等优点,在高压大功率和输出电能质量要求高的场合得到了广泛的应用[1-2]。相比传统二极管中点钳位型(neutral point clamed,NPC)拓扑[3-4],新型有源中点箝位型(active NPC,ANPC)拓扑使用可控的开关器件代替钳位二极管,有效地解决了器件的损耗平衡[5]。三电平ANPC逆变器拓扑如图1所示[5]。每相桥臂由6个开关器件Sx1、Sx2、Sx3、Sx4、Sx5和Sx6组成(其中x表示a,b,c三相),由于钳位电
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