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

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6490
Author(s):  
Muhammad Zahid Khan ◽  
Chaoxu Mu ◽  
Salman Habib ◽  
Khurram Hashmi ◽  
Emad M. Ahmed ◽  
...  
Keyword(s):  
Optimal Control ◽  
Reactive Power ◽  
Voltage Regulation ◽  
Power Sharing ◽  
Communication Link ◽  
Control Approach ◽  
Control Scheme ◽  
Islanded Microgrid ◽  
Optimal Regulator ◽  
Optimal Control Scheme

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.

A Simple Control Scheme for Improving Reactive Power Sharing in Islanded Microgrid

2020 ◽  
Vol 35 (4) ◽  
pp. 3158-3169 ◽  
Author(s):  
Yusuf Gupta ◽  
Kishore Chatterjee ◽  
Suryanarayana Doolla
Keyword(s):  
Reactive Power ◽  
Power Sharing ◽  
Control Scheme ◽  
Islanded Microgrid

scholarly journals Harmonic reduction in a renewable energy islanded microgrid with fuzzy PID controller

2018 ◽  
Vol 7 (2.12) ◽  
pp. 380
Author(s):  
N S.Srivatchan ◽  
Dr P.Rangarajan
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Power Sharing ◽  
Multilevel Inverter ◽  
Communication Link ◽  
Loop Control ◽  
Load Variations ◽  
Fuzzy Pid Controller ◽  
Variable Nature ◽  
Islanded Microgrid

Power sharing in an Islanded microgrid is not straight forward due to load variations as well as variable nature of Renewable En-ergy sources. This unequal power sharing leads to circulating currents, load imbalance and increased harmonic content. Traditional droop controller provides simple control for real power sharing without communication link, but they suffer from inaccurate reactive power sharing. To overcome the inherent drawback of traditional droop controller, this paper proposes cascaded H-bridge (CHB) multilevel inverter. CHB multilevel inverter provide increased output voltage, there by improves power quality. The Fuzzy Logic Con-troller provides simple and accurate control to CHB multilevel inverter. The proposed system is simulated in MATLAB Simulink Envi-ronment. This scheme provides closed loop control of DG units, in turn improves reactive power sharing between DG units, and thereby effectively reduces total harmonic distortion during islanding. The main focus of the paper is in power sharing issue on har-monic currents. The simulation results are verified with experimental microgrid hardware.  

scholarly journals Analysis and design of new droop control scheme for three-phase parallel inverters in standelone Microgrid.

2016 ◽  
Vol 19 (1) ◽  
pp. 5-19
Author(s):  
Phuong Minh Le ◽  
Huy Minh Nguyen ◽  
Hoa Thi Xuan Pham ◽  
Tho Quang Tran
Keyword(s):  
Reactive Power ◽  
Voltage Drop ◽  
Voltage Regulation ◽  
Power Sharing ◽  
Output Impedance ◽  
Load Voltage ◽  
Analysis And Design ◽  
Proposed Model ◽  
Three Phase ◽  
Control Scheme

This paper presents a new load sharing technique for parallel-connected three-phase inverters in Standelone Microgrid. The paper proposed improvements droop controller to accurate load share by ratio with rated power of the inverter. In addition, the proposed scheme ensures reduced load voltage droop due to the load and droop. In the paper, the active power and reactive power are divided by voltage regulation under reference voltage in conditions of stark difference between line impedances, In addition the paper presents the ability to overcome the disadvantages of traditional droop scheme. The proposed model is simulated by Matlab-Simulink for 3 parallel-connected threephase inverters. The simulation results proved the technical soundness and advantages of the proposed in comparision with a tradition scheme even if the output impedance is resistance reactance in power sharing and load voltage drop reduce problems.

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