Virtual Multi-Slack Droop Control of Stand-Alone Microgrid With High Renewable Penetration Based on Power Sensitivity Analysis

Dong Hee Choi; Jung Wook Park; Soo Hyoung Lee

doi:10.1109/TPWRS.2018.2810443

Virtual Multi-Slack Droop Control of Stand-Alone Microgrid With High Renewable Penetration Based on Power Sensitivity Analysis

Dong Hee Choi, Jung Wook Park, Soo Hyoung Lee

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Recently, microgrids have faced a great challenge for the stable operation of converter-dominant system with very high renewable penetration. The converter-based-generator reduces inertia constant. In this case, very small power imbalance can cause large frequency variation. Therefore, the accurate load sharing between generators is important for the stable operation. This paper proposes the virtual multi-slack (VMS) droop control based on the power sensitivity analysis. In other words, one physical slack generator directly controls the magnitude and phase angle of its bus voltage. At the same time, the other generators indirectly control the magnitudes and phase angles of their bus voltages by using the VMS droop control. This results in the proper load sharing between the generators in the stand-alone microgrid. That is, all nonslack generators operate as virtual slacks so that they solve the power imbalances together with one physical slack generator. The proposed VMS control is realized with the multi-slack power flow analysis, which enables adaptive droop based power allocation between the generators. Then, its effectiveness is verified with several case studies on the practical stand-alone microgrid in South Korea by using the electromagnetic transient program.

Original language	English
Pages (from-to)	3408-3417
Number of pages	10
Journal	IEEE Transactions on Power Systems
Volume	33
Issue number	3
DOIs	https://doi.org/10.1109/TPWRS.2018.2810443
Publication status	Published - 2018 May

Bibliographical note

Funding Information:
Manuscript received July 31, 2017; revised December 22, 2017; accepted February 12, 2018. Date of publication February 28, 2018; date of current version April 17, 2018. This work was supported in part by the National Research Foundation of Korea funded by the Korea government (MEST) under Grant 2016R1E1A1A-02920095 and in part by the Korea Electric Power Corporation. Paper no. TPWRS-01136-2017. (Corresponding author: Soo Hyoung Lee.) D. Choi is with the Korea Telecom, Seoul 03155, South Korea (e-mail: igo87@yonsei.ac.kr).

Publisher Copyright:
© 2017 IEEE.

All Science Journal Classification (ASJC) codes

Energy Engineering and Power Technology
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/TPWRS.2018.2810443

Cite this

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title = "Virtual Multi-Slack Droop Control of Stand-Alone Microgrid With High Renewable Penetration Based on Power Sensitivity Analysis",

abstract = "Recently, microgrids have faced a great challenge for the stable operation of converter-dominant system with very high renewable penetration. The converter-based-generator reduces inertia constant. In this case, very small power imbalance can cause large frequency variation. Therefore, the accurate load sharing between generators is important for the stable operation. This paper proposes the virtual multi-slack (VMS) droop control based on the power sensitivity analysis. In other words, one physical slack generator directly controls the magnitude and phase angle of its bus voltage. At the same time, the other generators indirectly control the magnitudes and phase angles of their bus voltages by using the VMS droop control. This results in the proper load sharing between the generators in the stand-alone microgrid. That is, all nonslack generators operate as virtual slacks so that they solve the power imbalances together with one physical slack generator. The proposed VMS control is realized with the multi-slack power flow analysis, which enables adaptive droop based power allocation between the generators. Then, its effectiveness is verified with several case studies on the practical stand-alone microgrid in South Korea by using the electromagnetic transient program.",

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Virtual Multi-Slack Droop Control of Stand-Alone Microgrid With High Renewable Penetration Based on Power Sensitivity Analysis

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

UN SDGs

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