Small-Signal Stability Assessment and Active Stabilization of a Bidirectional Battery Charger

被引：60
作者：
Iyer, Vishnu Mahadeva [1 ]
Gulur, Srinivas [1 ]
Bhattacharya, Subhashish [1 ]
机构：
[1] North Carolina State Univ, Elect & Comp Engn Dept, Raleigh, NC 27695 USA
来源：
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS | 2019年 / 55卷 / 01期
关键词：
AC-DC power converters; active damping; active stabilization; battery charger; dual active bridge (DAB); impedance modeling; small-signal modeling; stability; virtual resistance; voltage source converter (VSC); BUS VOLTAGE CONTROL; MOTOR-DRIVES; POWER; MODULATION; CONVERTER; DESIGN; SYSTEM; BRIDGE; MODEL;
D O I：
10.1109/TIA.2018.2871101
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A two-stage electric vehicle (EV) battery charger typically consists of an ac-dc converter cascaded with a dc-dc converter. In such a cascaded system, maintaining stability at the intermediate dc link is imperative for reliable operation of the battery charger under different operating modes. This paper addresses the intermediate dc-link stability challenges that exist in a bidirectional two-stage grid connected single-phase battery charger. It is delineated that the small-signal load-dependent resistance of the ac-dc converter plays a crucial role in determining the stability of the bidirectional battery charger. A virtual-resistor-based active damping control strategy that does not require any additional sensors is explored for the ac-dc converter to stabilize the cascaded system under all operating modes irrespective of the power flow direction. Experimental results on a grid-connected single-phase battery charger hardware prototype are presented to validate the proposed models and showcase the improvement in the dc-link stability due to the virtual-resistance-based active damping approach.
引用
收藏
页码：563 / 574
页数：12
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