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

Muhammad Zahid Khan, Chaoxu Mu, Salman Habib, Khurram Hashmi, Emad M. Ahmed and Waleed Alhosaini
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Muhammad Zahid Khan: School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Chaoxu Mu: School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Salman Habib: College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China
Khurram Hashmi: Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
Emad M. Ahmed: Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka 72388, Saudi Arabia
Waleed Alhosaini: Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka 72388, Saudi Arabia

Energies, 2021, vol. 14, issue 20, 1-22

Abstract: 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.

Keywords: MG control; reactive power sharing; distributed optimal control; voltage regulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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