Decentralized Power Management of a PV/Battery Hybrid Unit in a Droop-Controlled Islanded Microgrid

被引:114
|
作者
Mahmood, Hisham [1 ]
Michaelson, Dennis [1 ]
Jiang, Jin [1 ]
机构
[1] Univ Western Ontario, Dept Elect & Comp Engn, London, ON N6A 5B9, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Battery storage; droop control; microgrid; PV; DISTRIBUTED GENERATION INVERTERS; CONTROL STRATEGY; PARALLEL OPERATION; ENERGY MANAGEMENT; STORAGE-SYSTEM; VOLTAGE; DESIGN; BATTERIES; IMPEDANCE; CHARGER;
D O I
10.1109/TPEL.2015.2394351
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, a control strategy is proposed to achieve decentralized power management of a PV/battery hybrid unit in a droop-controlled islanded microgrid. In contrast to the common approach of controlling the PV unit as a current source, in the proposed strategy, the PV unit is controlled as a voltage source that follows a multi-segment adaptive power/frequency characteristic curve. The proposed power/frequency characteristics, of the hybrid unit and of the whole microgrid, adapt autonomously to the microgrid operating conditions so that the hybrid unit may supply the maximum PV power, match the load, and/or charge the battery, while maintaining the power balance in the microgrid and respecting the battery state-of-charge limits. These features are achieved without relying on a central management system and communications, as most of the existing algorithms do. The control strategy is implemented using multi-loop controllers, which provide smooth and autonomous transitions between the operating scenarios. Small-signal stability of the proposed control loops is investigated, and the system performance is experimentally validated on a 3.5 kVA microgrid.
引用
收藏
页码:7215 / 7229
页数:15
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