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Open AccessArticle

Reinforced Droop for Active Current Sharing in Parallel NPC Inverter for Islanded AC Microgrid Application

School of Electrical Engineering, Vellore Institute of Technology, Vellore 632014, Tamilnadu, India
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Energies 2019, 12(16), 3090; https://doi.org/10.3390/en12163090
Received: 29 April 2019 / Revised: 7 August 2019 / Accepted: 8 August 2019 / Published: 11 August 2019
(This article belongs to the Section Smart Grids and Microgrids)
The paper investigates the current sharing in parallel 3-level Neutral point clamped inverter for islanded AC microgrid application. In Distributed generation, parallel power electronic interface based microgrid suffers from power quality issues due to inaccurate output current sharing. To address the current sharing problem, the paper proposes an improved droop technique that reinforces the droop loop by infusing the incurred voltage drop accountable for inaccurate current sharing at the inverter output. The control based on droop reference is bounded with regard to output current since the output impedance influences the output current of the inverter largely. Besides that, the parallel NPC inverter also suffers from dc link voltage imbalance due to neutral currents. To address these issues a control strategy is proposed in the research work in which the processed DC offset is incorporated into the reinforced droop loop and the generated reference is utilized with feedback control to accurately share the currents under linear and nonlinear load conditions. The effectiveness of devised reinforced droop strategy is realized in MATLAB/Simulink environment and experimental validation is carried out with the field-programmable gate array as hardware interface to the hardware laboratory prototype of parallel NPC inverter. View Full-Text
Keywords: distributed power generation; 3-level Neutral point clamped inverter; reinforced droop control; field programmable gate array; islanded microgrid; circulating current distributed power generation; 3-level Neutral point clamped inverter; reinforced droop control; field programmable gate array; islanded microgrid; circulating current
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Purushotham, M.; Muniswamy, K. Reinforced Droop for Active Current Sharing in Parallel NPC Inverter for Islanded AC Microgrid Application. Energies 2019, 12, 3090.

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