微电网三相四柱组合式双向变流器双模式控制  

Dual Mode Control of Combined Three-Phase Four-Limb Bi-Directional Converter

作　　者：刘钊 孙新程 谭迪 吉小鹏[1] 叶曙光 黄向奔 

机构地区：[1]南京理工大学自动化学院,江苏省南京市210094 [2]江苏林洋微网科技有限公司,江苏省南京市211112

出　　处：《电网技术》2017年第12期3892-3900,共9页Power System Technology

基　　金：国家自然科学基金资助项目(51507086);江苏省自然科学基金资助项目(BK20150839)~~

摘　　要：三相四柱组合式电路相对于组合式三相电路具有体积小、重量轻和成本低等优点,非常适合微电网双模式应用场合。提出采用三相四柱组合式双向变流器,并针对其双模式控制展开研究。首先建立其各相序等效模型,定性分析出并网条件下并网电流中存在三次谐波电流,并提出了复合控制和指定次谐波消除相结合的控制方法;针对离网时带不平衡单相负载问题,采用了三相独立控制的方法,提出了带动态直流偏磁抑制的双闭环复合控制策略,在抑制直流分量的同时具备较好的动态和稳态性能。最后通过实验验证了所提电路及控制方法的有效性。Compared with combined three-phase circuit,combined three-phase four-limb circuit has advantages of small size,light weight and low cost,very suitable for micro-grid dual-mode applications.A combined three-phase four-limb bi-directional converter is proposed and its dual-mode control is studied.Firstly,equivalent model of each phase sequence is established.It is proved qualitatively that there is a third order harmonic current in grid-connected current under grid-tied condition.A control method combining hybrid control with selective harmonic elimination is proposed.To solve problem of unbalanced load under off-grid condition,a hybrid double closed-loop control with dynamic DC bias suppression is proposed on basis of three-phase independent control.It has good dynamic and steady-state performance and no DC bias.Finally,effectiveness of the proposed circuit and control method is verified with experiment.

关 键 词：三相四柱 组合式 双向变流器 双模式 

分 类 号：TM715[电气工程—电力系统及自动化]