Voltage Stability and Power Sharing Control of Distributed Generation Units in DC Microgrids

被引:9
作者
Ahmed, Kafeel [1 ]
Hussain, Irfan [1 ,2 ]
Seyedmahmoudian, Mehdi [1 ]
Stojcevski, Alex [1 ]
Mekhilef, Saad [1 ,2 ,3 ]
机构
[1] Swinburne Univ Technol, Sch Sci Comp & Engn Technol, Hawthorn, Vic 3122, Australia
[2] Univ Malaya, Dept Elect Engn, Power Elect & Renewable Energy Res Lab, Kuala Lumpur 50603, Malaysia
[3] Univ Hail, Coll Engn, Elect Engn Dept, Hail 81481, Saudi Arabia
关键词
DC microgrid; distributed generation; sliding mode control; universal droop control; voltage stability; power sharing; DROOP; DESIGN; FEEDFORWARD;
D O I
10.3390/en16207038
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Advancements in power conversion efficiency and the growing prevalence of DC loads worldwide have underscored the importance of DC microgrids in modern energy systems. Addressing the challenges of power-sharing and voltage stability in these DC microgrids has been a prominent research focus. Sliding mode control (SMC) has demonstrated remarkable performance in various power electronic converter applications. This paper proposes the integration of universal droop control (UDC) with SMC to facilitate distributed energy resource interfacing and power-sharing control in DC microgrids. Compared to traditional Proportional-Integral (PI) control, the proposed control approach exhibits superior dynamic response characteristics. The UDC is strategically incorporated prior to the SMC and establishes limits on voltage variation and maximum power drawn from the DC-DC converters within the microgrid. A dynamic model of the DC-DC converter is developed as the initial stage, focusing on voltage regulation at the DC link through nonlinear control laws tailored for Distributed Generation (DG)-based converters. The UDC ensures voltage stability in the DC microgrid by imposing predetermined power constraints on the DGs. Comparative evaluations, involving different load scenarios, have been conducted to assess the performance of the proposed UDC-based SMC control in comparison to the PI control-based system. The results demonstrate the superior efficiency of the UDC-based SMC control in handling dynamic load changes. Furthermore, a practical test of the proposed controller has been conducted using a hardware prototype of a DC microgrid.
引用
收藏
页数:17
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