Droop Control for Power Sharing and Voltage and Frequency Regulation in Parallel Distributed Generations on AC Microgrid

2018 ◽  
Author(s):  
Dalmo Cardoso da S. ◽  
Jessica S. Dohler ◽  
Pedro M. de Almeida ◽  
Janaina G. de Oliveira
Keyword(s):  
Power Sharing ◽  
Frequency Regulation ◽  
Droop Control ◽  
Distributed Generations ◽  
Ac Microgrid

A Droop Control Strategy with Impedance Compensation for Low Voltage Microgrid

2013 ◽  
Vol 441 ◽  
pp. 245-248
Author(s):  
Zhi Yong Yu ◽  
Ming Lu ◽  
Zhen Nan Wang ◽  
Yi Gong Zhang
Keyword(s):  
Control Strategy ◽  
Low Voltage ◽  
Power Sharing ◽  
Droop Control ◽  
Parallel Operation ◽  
Distributed Generations ◽  
Point Of Common Coupling ◽  
Simulation Results ◽  
Common Coupling ◽  
Virtual Impedance

With conventional droop control, parallel operation of distributed generations (DG) in microgrid would lead to unbalanced power sharing. In this paper, inherent limitation of conventional droop control is analyzed. Analysis results show that different converter output impedance and line impedance make the power sharing unbalanced. In order to weaken or eliminate impedance difference from point of common coupling (PCC) to DGs, virtual impedance is introduced. By the introduction of designed virtual impedance, a novel droop control strategy with impedance compensation is proposed in this paper. Simulation results are presented from a two converters parallel-connected microgrid, showing the effectiveness of the droop control with impedance compensation. Simulation results show that DGs with proposed approach can allocate the power equally, and work stably in grid-connected mode, island mode and progress of reconnection to grid.

scholarly journals An Islanded Microgrid Droop Control using Henry Gas Solubility Optimization

2021 ◽  
Vol 10 (3) ◽  
pp. 43-48
Author(s):  
Mohamed A. Ebrahim ◽  
Reham M. Abdel Fattah ◽  
Ebtisam M. Saied ◽  
Samir M. Abdel Maksoud ◽  
Hisham El Khashab
Keyword(s):  
Control Method ◽  
Control Strategies ◽  
Voltage Regulation ◽  
Power Sharing ◽  
Droop Control ◽  
Gas Solubility ◽  
Distributed Generations ◽  
Communication Links ◽  
Proper Power ◽  
Micro Grid

Coordination of various distributed generation (DG) units is required to meet the growing demand for electricity. Several control strategies have been developed to operate parallel-connected inverters for microgrid load sharing. Among these techniques, due to the lack of essential communication links between parallel-connected inverters to coordinate the DG units within a microgrid, the droop control method has been generally accepted in the scientific community. This paper discusses the microgrid droop controller during islanding using the Henry Gas Solubility Optimization (HGSO). The most important goals of droop control in the islanded mode of operation are the frequency and voltage control of microgrid and proper power sharing between distributed generations. The droop controller has been designed using HGSO to optimally choose PI gains and droop control coefficients in order to obtain a better microgrid output response during islanding. Simulation results indicate that the droop controller using HGSO improves the efficiency of micro-grid power by ensuring that variance in microgrid frequency and voltage regulation and effective power sharing occurs whenever micro-grid island mode or when variation in load occurs.

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