DefinePK

Abstract

Conventional droop control is a basic control strategy for power sharing in AC microgrid applications. This strategy has several limitations, such as low transient response and voltage deviation. This paper presents an improved droop control method for the proper operation of parallel-connected inverters in AC microgrid. The proposed method is able to improve transient response and achieved higher output power without voltage and frequency deviation by introducing a power derivative term into a conventional droop method. The second-order general integrator scheme with low-pass filter was also used to obtain the average power obscured from each power electronic inverter to gain the power signal without a DC component. The simulation was developed in MATLAB/Simulink to verify the effectiveness of the improved droop control scheme. Based on the results, an improved droop control strategy was proposed to improve the operation of parallel-connected power electronic inverters in the microgrid systems of existing AC distribution systems.