An Optimal Control Scheme for Load Bus Voltage Regulation and Reactive Power-Sharing in an Islanded Microgrid

Energies

Salman Habib¹  Waleed Alhosaini²  Emad M. Ahmed²  Khurram Hashmi³  Muhammad Zahid Khan⁴  Chaoxu Mu⁴ 

[1] College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China;Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka 72388, Saudi Arabia;Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan;School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China;

关键词: MG control;    reactive power sharing;    distributed optimal control;    voltage regulation;   

DOI  :  10.3390/en14206490

来源: DOAJ

【 摘 要 】

This paper presents an optimal control scheme for an islanded microgrid (MG), which performs reactive power-sharing and voltage regulation. Two-fold objectives are achieved, i.e., the load estimation strategy, firstly, approximates the MG’s impedance and transmits this information through a communication link. Based on approximated impedance information, an optimal regulator is then constructed to send optimal control commands to respective local power controllers of each distributed generation unit. An optimal regulator is a constraints optimized problem, mainly responsible to restore the buses’ voltage magnitudes and realize power-sharing proportionally. The important aspect of this control approach is that the voltage magnitude information is only required to be transferred to each inverter’s controller. In parallel, a secondary control layer for frequency restoration is implemented to minimize the system frequency deviations. The MATLAB/Simulink and experimental results obtained under load disturbances show the effectiveness for optimizing the voltage and power. Modeling and analysis are also verified through stability analysis using system-wide mathematical small-signal models.

【 授权许可】

Unknown