Power sharing control strategy of parallel inverters in AC microgrid using improved reverse droop control. (2nd December 2019)

• Record Type: Journal Article
• Authors: D, Chethan Raj; Gaonkar, Dattatraya N.; Guerrero, Josep M.
• Is Part Of: International journal of power electronics. Volume 11:Number 1(2020)
• Page Start: 116
• Page End: 137
• Publication Date: 2019-12-02
• Subjects: droop control -- reverse droop control -- distributed generation -- inverters -- microgrid -- output impedance -- secondary control -- virtual resistors; Power electronics -- Periodicals; 621.31705
• Languages: English
• ISSNs: 1756-638X

Abstract

Microgrid structure is developed on the basis of distributed generation units. Microgrid distributed generation units and energy storage devices are connected through inverters interface to the point of common coupling. Microgrid system with multiple inverters, the use of conventional direct and reverse droop control method will cause uneven distribution of power, which is due to the difference between the output impedance and the line impedance of the inverter. In this paper, the traditional reverse droop control method is introduced, the power distribution of inverter output impedance is analysed, and the defects of traditional reverse droop control are pointed out. Adding virtual resistor in the control loop of reverse droop control improves the power sharing and stability of operation, but also leads to the voltage drop in microgrid. To compensate the output voltage deviation, secondary control is proposed. Simulation results show the correctness and effectiveness of the proposed control strategy.