基于新型矢量选择表的电压型三电平中性点钳位整流器直接功率控制策略  

Direct Power Control Strategy Based on Novel Switching Table Applied in Three-Level Neutral Point Clamped Voltage Source Rectifier

作　　者：李宁[1,2] 王跃[1] 王兆安[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]西安理工大学自动化与信息工程学院,西安710048

出　　处：《电工技术学报》2016年第8期76-89,共14页Transactions of China Electrotechnical Society

基　　金：国家高技术研究发展计划(863计划)(2012AA050206);国家自然科学基金(51277150;51307140;51507140);新世纪优秀人才支持计划;陕西省教育厅专项科研基金(15JK1508);西安理工大学博士启动金(105-211421)资助项目

摘　　要：在电压型三电平中性点钳位(NPC)整流器的控制策略中,直接功率控制(DPC)策略具有算法简单和动态性能好的优点。分析了电压型三电平NPC整流器DPC策略的基本原理,推导了系统瞬时功率与交、直流侧参数的关系,并研究了系统直流电压利用率对瞬时功率的影响,提出一类新颖的三电平NPC整流器DPC策略。该策略将系统直流电压利用率分成若干区域,在每个区域中选择不同的矢量选择表对系统瞬时功率进行控制。此外,通过合理选择DPC策略矢量表对应的开关状态,解决了三电平NPC整流器直流电容电压不平衡问题。最后,针对某些直流电压利用率区间内系统瞬时无功功率存在非正常波动问题,分析其产生原因,并通过添加过渡扇区及与之对应的矢量选择表格,对系统瞬时无功功率的非正常波动进行修正。仿真和实验验证了理论分析的正确性。Direct power control（DPC） strategy has the characteristics of simple algorithm and good dynamic performance in the control of three-level neutral point clamped（NPC） voltage source rectifier. This paper analyzes the basic principle of DPC strategy and deduces the relationship between system instantaneous power and parameters of AC and DC sides. Furthermore, the influence of system DC voltage utilization ratio on instantaneous power is analyzed. Then, a novel DPC strategy is proposed. The new strategy divides the system DC voltage utilization ratio into several regions, and uses different switching tables to control the instantaneous power in each region. Moreover, the novel strategy solves the DC capacitor voltage imbalance problem of three-level NPC rectifier based on the reasonable selection of switching states. Finally, this paper analyzes the reason that the system instantaneous reactive power has abnormal fluctuations in some regions of DC voltage utilization ratio, and solves it by adding transition sector and its corresponding switching table. Simulation and experimental results verify the correctness of the analysis.

关 键 词：电压型三电平中性点钳位整流器 直接功率控制策略 直流电压利用率 直流电容 电压不平衡 瞬时无功功率 非正常波动 

分 类 号：TM464[电气工程—电器]