전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제27권2호
  • /
  • Pages.92-99
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  • 2022
  • /
  • 1229-2214(pISSN)
  • /
  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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직병렬 임피던스 보상을 통한 계통 연계 분산전원 인버터의 PCC 무효전력 제어 알고리즘

Reactive Power Control Algorithm of Grid-Connected Inverter at the Point of Common Coupling With Compensation of Series and Parallel Impedances

  • Heo, Cheol-Young (Dept. of Control & Instrumentation Engineering Team, Kwangwoon University) ;
  • Song, Seung-Ho (Dept. of Electronic Engineering, Kwangwoon University) ;
  • Kim, Yong-Rae (Dept. of Control & Instrumentation Engineering Team, Kwangwoon University)
  • 투고 : 2021.10.06
  • 심사 : 2021.11.30
  • 발행 : 2022.04.20
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초록

Due to space and geographical constraints, the power source may be located outside the island area, resulting in the considerable length of transmission line. In these cases, when an active power is transmitted, unexpected reactive power is generated at a point of common coupling (PCC). Unlike the power transmitted from the power generation source, the reactive power adversely affects the system. This study proposes a new algorithm that controls reactive power at PCC. Causes of reactive power errors are separated into parallel and series components, which allows the algorithm to compensate the reactive current of the inverter output and control reactive power at the PCC through calculations from the impedance, voltage, and current. The proposed algorithm has economic advantages by controlling the reactive power with the inverter of the power source itself, and can flexibly control power against voltage and output variations. Through the simulation, the algorithm was verified by implementing a power source of 3 [kVA] capacity connected to the low voltage system and of 5 [MVA] capacity connected to the extra-high voltage system. Furthermore, a power source of 3 [kVA] capacity inverter is configured and connected to a mock grid, then confirmed through experiments.

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과제정보

이 논문은 2021년도 광운대학교 우수연구자 지원사업, 산업통상자원부(MOTIE), 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구과제입니다. (No. 20193710100061)

참고문헌

  1. G. Yan, Y. Cai, Q. Jia, Y. Li, and S. Liang, "Stability analysis and operation control of photovoltaic generation system connected to weak grid," in IEEE Conference on Energy Internet and Energy System Integration (EI2), pp. 1-6, 2017.
  2. S. Sang, N. Gao, X. Cai, and R. Li, "A novel power-voltage control strategy for the gridtied inverter to raise the rated power injection level in a weak grid," IEEE J. Emerg. Sel. Topics Power Electron., Vol. 6 pp. 219-232, 2018. https://doi.org/10.1109/jestpe.2017.2715721
  3. W. Cheng, "Nonlinear behavior and analysis of three-phase grid-connected power converters [D]," Huazhong University of Science and Technology, 2014.
  4. H. Alenious, R. Luhtala, T. Messo, and T. Roinila "Autonomous reactive power support for smart photovoltaic inverter based on real-time grid-impedance measurements of a weak grid," Electric Power System Research, Vol. 182, pp. 1-3, 2020.
  5. J. A. Suul and M. Molinas, "Properties of reactive current injection by AC power electronic systems for loss minimization," in 2012 15th International Power Electronics and Motion Control Conference, pp. 1-8, 2012.
  6. A. Spring, G. Wirth, G. Becker, R. Pardatscher, and R. Witzmann, "Grid influences from reactive power flow of photovoltaic inverters with a power factor specification of one," IEEE Trans. Smart Grid, Vol. 7, pp. 1222-1229, 2016. https://doi.org/10.1109/TSG.2015.2413949
  7. M. Molinas, D. Moltoni, G. Fascendini, J. A. Suul, R. Faranda, and T. Undeland, "Investigation on the role of power electronic controlled constant power loads for voltage support in distributed AC systems," in 2008 IEEE Power Electronics Specialists Conference, pp. 3597-3602, 2018.
  8. X. Wang, D. Yang, and F. Blaabjerg, "Harmonic current control for LCL-filtered VSCs connected to ultra-weak grids," in 2017 IEEE Energy Conversion Congress and Exposition (ECCE), pp. 1608-1614, 2017.
  9. G. Yan, Y. Cai, Q. Jia, Y. Li, and S. Liang, "Stability analysis and operation control of energy internet and energy system photovoltaic generation system connected to weak grid," in 2017 IEEE Conference on Energy System Integration (EI2), pp. 1-6, 2017.
  10. A. Canrera-Tobar and E. Bullich, "Review of advanced grid requirements for the integration of large scale photovoltaic power plants in the transmission system," in Proceedings of the Science Direct, Renewable and Sustainable Energy Reviews, Vol. 62, pp. 981-982, 2016.
  11. Y. Ren and Z. Piao, "Effect of parallel compensation on series compensation in long distance distrbution line," in International Conference on Electronic & Mechanical Engineering and Information Technology, pp. 2139-2140, 2011.
  12. U. Karki, D. Gunasekaran, and F. Z. Peng, "Reactive compensation of overhead AC transmission lines using underground power cable," in 2015 IEEE Power & Energy Society General Meeting, pp. 1-3, 2015.
  13. S. A. Qureshi and Z. Hameed, "Reactive power compensation in solar power plants using FACTS devices," in 2016 Eighteenth International Middle East Power Systems Conference, pp. 474-479, 2016.
  14. D. P. Kadam and B. E. Kushare, "Reactive power improvement in wind park system using FACTS," in 2013 International Conference on Power, Energy and Control (ICPEC), pp. 366-370, 2013.
  15. Z. Chen, J. M. Guerrero, and F. Blaabjerg, "A review of the state of the art of power electronics for wind turbines," IEEE Trans. Power Electron., Vol. 24, pp. 1859-1875, 2009. https://doi.org/10.1109/TPEL.2009.2017082
  16. NEPSI, "Medium voltage shielded cable parameter calculator," [online]. Available: https://www.nepsi.com/resources/calculators/calculation-of-cable-data.htm.
  17. S. G. Jeong, "Electric machine," Haksan Media, pp. 76-78, 2017.