Improved Reactive Power Sharing and Harmonic Voltage Compensation in Islanded Microgrids Using Resistive-Capacitive Virtual Impedance

Minh-Duc Pham; Hong-Hee Lee

Improved Reactive Power Sharing and Harmonic Voltage Compensation in Islanded Microgrids Using Resistive-Capacitive Virtual Impedance

Minh-Duc Pham

Hong-Hee Lee

Vol. 19, No. 6, pp. 1575-1581, Nov. 2019

10.6113/JPE.2019.19.6.1575

Inaccurate reactive power sharing

Islanded microgrid

PCC voltage distortion

Virtual impedance

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Abstract

Due to the mismatched line impedance among distributed generation units (DGs) and uncontrolled harmonic current, the droop controller has a number of problems such as inaccurate reactive power sharing and voltage distortion at the point of common coupling (PCC). To solve these problems, this paper proposes a resistive-capacitive virtual impedance control method. The proposed control method modifies the DG output impedance at the fundamental and harmonic frequencies to compensate the mismatched line impedance among DGs and to regulate the harmonic current. Finally, reactive power sharing is accurately achieved, and the PCC voltage distortion is compensated. In addition, adaptively controlling the virtual impedance guarantees compensation performance in spite of load changes. The effectiveness of the proposed control method was verified by experimental results.

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Cite this article

[IEEE Style]

M. Pham and H. Lee, "Improved Reactive Power Sharing and Harmonic Voltage Compensation in Islanded Microgrids Using Resistive-Capacitive Virtual Impedance," Journal of Power Electronics, vol. 19, no. 6, pp. 1575-1581, 2019. DOI: 10.6113/JPE.2019.19.6.1575.

[ACM Style]

Minh-Duc Pham and Hong-Hee Lee. 2019. Improved Reactive Power Sharing and Harmonic Voltage Compensation in Islanded Microgrids Using Resistive-Capacitive Virtual Impedance. Journal of Power Electronics, 19, 6, (2019), 1575-1581. DOI: 10.6113/JPE.2019.19.6.1575.