Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Qian Guo; Hongyan Wu; Liaoyuan Lin; Zhihong Bai; Hao Ma

Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Vol. 16, No. 1, pp. 329-339, Jan. 2016

10.6113/JPE.2016.16.1.329

Droop control

Microgrid

Reactive power sharing

Secondary voltage control

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Abstract

Owing to mismatched feeder impedances in an islanded microgrid, the conventional droop control method typically results in errors in reactive power sharing among distributed generation (DG) units. In this study, an improved droop control strategy based on secondary voltage control is proposed to enhance the reactive power sharing accuracy in an islanded microgrid. In a DG local controller, an integral term is introduced into the voltage droop function, in which the voltage compensation signal from the secondary voltage control is utilized as the common reactive power reference for each DG unit. Therefore, accurate reactive power sharing can be realized without any power information exchange among DG units or between DG units and the central controller. Meanwhile, the voltage deviation in the microgrid common bus is removed. Communication in the proposed strategy is simple to implement because the information of the voltage compensation signal is broadcasted from the central controller to each DG unit. The reactive power sharing accuracy is also not sensitive to time-delay mismatch in the communication channels. Simulation and experimental results are provided to validate the effectiveness of the proposed method.

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Cite this article

[IEEE Style]

Q. Guo, H. Wu, L. Lin, Z. Bai, H. Ma, "Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid," Journal of Power Electronics, vol. 16, no. 1, pp. 329-339, 2016. DOI: 10.6113/JPE.2016.16.1.329.

[ACM Style]

Qian Guo, Hongyan Wu, Liaoyuan Lin, Zhihong Bai, and Hao Ma. 2016. Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid. Journal of Power Electronics, 16, 1, (2016), 329-339. DOI: 10.6113/JPE.2016.16.1.329.