基于分离拓扑结构的直流电压平衡控制策略  

DC Voltage Balance Control With Separated Topology

作　　者：常卫花[1] 陈智娟 CHANG Wei-hua;CHEN Zhi-juan(Xinxiang Vocational and Technical College,Xinxiang 453200,China;不详)

机构地区：[1]新乡职业技术学院,河南新乡453200 [2]河南工学院,河南新乡451191

出　　处：《电力电子技术》2021年第2期65-69,93,共6页Power Electronics

基　　金：国家重点研发计划(2017YFB0903300)。

摘　　要：针对严重不平衡条件导致的级联H桥电力电子变压器(PET)中高压侧和低压侧直流电压不平衡问题,提出了一种基于分离拓扑结构的级联H桥PET独立直流电压平衡控制。该策略通过调节流经隔离级和输出级有功功率来分别平衡高压直流链路和低压直流链路。首先,详细讨论了不同PET调整策略的最大调整有功功率,并与所提策略进行电压平衡能力对比。然后详细描述了所提策略的控制框图,最后通过实验对在严重不平衡条件下各策略的电压平衡能力进行比较。实验验证了所提策略的有效性,结果表明:该策略具备最大调整有功功率以及在严重不平衡条件下优良的电压平衡能力,此外所提策略具备通用性。In order to solve the problem of DC voltage imbalance between high voltage side and low voltage side of the cascade H-bridge power electronic transformer(PET)caused by serious unbalance,a separated topology based cascade H-bridge PET independent DC voltage balance control is proposed.The strategy balances the high voltage DClink and low voltage DC-link by adjusting the active power flowing through the isolation stage and the output stage respectively.Firstly,the maximum active power of PET adjustment strategies is discussed in detail,and the voltage balance capability is compared with the proposed strategies.Then the control block diagram of the proposed strategy is described in detail,and then the voltage balancing capacity of each strategy under the condition of serious unbalance is compared through experiments.The effectiveness of the proposed strategy is verified by experiments,and the results show that the strategy has the maximum adjustable active power and excellent voltage balancing ability under severe unbalanced conditions.In addition,the strategy is applicable to the case that each phase has different number of high voltage and low voltage ports.

关 键 词：电力电子变压器 分离拓扑结构 高/低压直流链路 

分 类 号：TM41[电气工程—电器]