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

Author

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  • Monica Purushotham

    (School of Electrical Engineering, Vellore Institute of Technology, Vellore 632014, Tamilnadu, India)

  • Kowsalya Muniswamy

    (School of Electrical Engineering, Vellore Institute of Technology, Vellore 632014, Tamilnadu, India)

Abstract

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.

Suggested Citation

  • Monica Purushotham & Kowsalya Muniswamy, 2019. "Reinforced Droop for Active Current Sharing in Parallel NPC Inverter for Islanded AC Microgrid Application," Energies, MDPI, vol. 12(16), pages 1-27, August.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:16:p:3090-:d:256726
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    References listed on IDEAS

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    1. Junjie Ma & Xudong Wang & Jinfeng Liu & Hanying Gao, 2019. "An Improved Droop Control Method for Voltage-Source Inverter Parallel Systems Considering Line Impedance Differences," Energies, MDPI, vol. 12(6), pages 1-17, March.
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    4. Biying Ren & Xiangdong Sun & Shasha Chen & Huan Liu, 2018. "A Compensation Control Scheme of Voltage Unbalance Using a Combined Three-Phase Inverter in an Islanded Microgrid," Energies, MDPI, vol. 11(9), pages 1-15, September.
    5. Jiawei Chen & Shuaicheng Hou & Xiang Li, 2018. "Decentralized Circulating Currents Suppression for Paralleled Inverters in Microgrids Using Adaptive Virtual Inductances," Energies, MDPI, vol. 11(7), pages 1-16, July.
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    7. Jae-Hyuk Kim & Yoon-Seok Lee & Hyun-Jun Kim & Byung-Moon Han, 2017. "A New Reactive-Power Sharing Scheme for Two Inverter-Based Distributed Generations with Unequal Line Impedances in Islanded Microgrids," Energies, MDPI, vol. 10(11), pages 1-20, November.
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