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access icon free Power sharing in parallel inverters with different types of loads

© The Institution of Engineering and Technology
Received 19/04/2016, Accepted 26/12/2016, Revised 02/12/2016, Published 11/01/2017

Microgrids are used widely in electric power systems for enhancing the power system operation in both grid-connected and island modes. One of the main problems with microgrid operations in power systems is maintaining the microgrid voltage and frequency within permissible ranges and sharing microgrid loads among participating distribution generations (DGs) in an island mode. The droop control method will pose a degraded performance when feeder impedances of DGs are different. In this study, a new control method based on the virtual impedance and the compensating voltage is proposed and the simulation results show that this method combined with the droop control will offer a balanced power sharing among DGs with negligible voltage and frequency drops. Here both single-bus and multi-bus microgrids with distributed loads have been considered. The simulation results are based on the MATLAB Simulink which shows that the proposed method has a good load sharing performance among DGs with varying feeder impedances and droop gains.

Inspec keywords: voltage control; power generation control; distributed power generation; electric potential; compensation; invertors; power control

Other keywords: DG; distribution generation; frequency drop; island mode; grid-connected mode; MATLAB Simulink; virtual impedance; voltage drop; single-bus microgrid; power sharing; multibus microgrid; voltage compensation; parallel inverter; droop control method; electric power system

Subjects: Control of electric power systems; Distributed power generation; Power and energy control; DC-AC power convertors (invertors); Voltage control

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