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Small-Signal Stability Analysis of Photovoltaic-Hydro Integrated Systems on Ultra-Low Frequency Oscillation

Author

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  • Sijia Wang

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Xiangyu Wu

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Gang Chen

    (State Grid Sichuan Electric Power Research Institute, Chengdu 610072, China)

  • Yin Xu

    (School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China)

Abstract

In recent years, ultralow-frequency oscillation has repeatedly occurred in asynchronously connected regional power systems and brought serious threats to the operation of power grids. This phenomenon is mainly caused by hydropower units because of the water hammer effect of turbines and the inappropriate Proportional-Integral-Derivative (PID) parameters of governors. In practice, hydropower and solar power are often combined to form an integrated photovoltaic (PV)-hydro system to realize complementary renewable power generation. This paper studies ultralow-frequency oscillations in integrated PV-hydro systems and analyzes the impacts of PV generation on ultralow-frequency oscillation modes. Firstly, the negative damping problem of hydro turbines and governors in the ultralow-frequency band was analyzed through the damping torque analysis. Subsequently, in order to analyze the impact of PV generation, a small-signal dynamic model of the integrated PV-hydro system was established, considering a detailed dynamic model of PV generation. Based on the small-signal dynamic model, a two-zone and four-machine system and an actual integrated PV-hydro system were selected to analyze the influence of PV generation on ultralow-frequency oscillation modes under different scenarios of PV output powers and locations. The analysis results showed that PV dynamics do not participate in ultralow-frequency oscillation modes and the changes of PV generation to power flows do not cause obvious changes in ultralow-frequency oscillation mode. Ultra-low frequency oscillations are mainly affected by sources participating in the frequency adjustment of systems.

Suggested Citation

  • Sijia Wang & Xiangyu Wu & Gang Chen & Yin Xu, 2020. "Small-Signal Stability Analysis of Photovoltaic-Hydro Integrated Systems on Ultra-Low Frequency Oscillation," Energies, MDPI, vol. 13(4), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:4:p:1012-:d:324623
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    References listed on IDEAS

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    1. Jun Deng & Nan Xia & Jungang Yin & Jiliang Jin & Shutao Peng & Tong Wang, 2020. "Small-Signal Modeling and Parameter Optimization Design for Photovoltaic Virtual Synchronous Generator," Energies, MDPI, vol. 13(2), pages 1-14, January.
    2. de Jong, Pieter & Barreto, Tarssio B. & Tanajura, Clemente A.S. & Kouloukoui, Daniel & Oliveira-Esquerre, Karla P. & Kiperstok, Asher & Torres, Ednildo Andrade, 2019. "Estimating the impact of climate change on wind and solar energy in Brazil using a South American regional climate model," Renewable Energy, Elsevier, vol. 141(C), pages 390-401.
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    Cited by:

    1. Lu, Xueding & Li, Chaoshun & Liu, Dong & Zhu, Zhiwei & Tan, Xiaoqiang, 2022. "Influence of water diversion system topologies and operation scenarios on the damping characteristics of hydropower units under ultra-low frequency oscillations," Energy, Elsevier, vol. 239(PE).
    2. Liu, Dong & Li, Chaoshun & Malik, O.P., 2021. "Nonlinear modeling and multi-scale damping characteristics of hydro-turbine regulation systems under complex variable hydraulic and electrical network structures," Applied Energy, Elsevier, vol. 293(C).
    3. Lorenzo Bongini & Rosa Anna Mastromauro & Daniele Sgrò & Fabrizio Malvaldi, 2020. "Electrical Damping Assessment and Stability Considerations for a Highly Electrified Liquefied Natural Gas Plant," Energies, MDPI, vol. 13(10), pages 1-27, May.
    4. Liu, Dong & Li, Chaoshun & Tan, Xiaoqiang & Lu, Xueding & Malik, O.P., 2021. "Damping characteristics analysis of hydropower units under full operating conditions and control parameters: Accurate quantitative evaluation based on refined models," Applied Energy, Elsevier, vol. 292(C).
    5. Dong, Wenhui & Cao, Zezhou & Zhao, Pengchong & Yang, Zhenbiao & Yuan, Yichen & Zhao, Ziwen & Chen, Diyi & Wu, Yajun & Xu, Beibei & Venkateshkumar, M., 2023. "A segmented optimal PID method to consider both regulation performance and damping characteristic of hydroelectric power system," Renewable Energy, Elsevier, vol. 207(C), pages 1-12.
    6. Gang Chen & Chang Liu & Chengwei Fan & Xiaoyan Han & Huabo Shi & Guanhong Wang & Dongping Ai, 2020. "Research on Damping Control Index of Ultra-Low-Frequency Oscillation in Hydro-Dominant Power Systems," Sustainability, MDPI, vol. 12(18), pages 1-13, September.
    7. Sha Li & Zezhou Cao & Kuangqing Hu & Diyi Chen, 2023. "Performance Assessment for Primary Frequency Regulation of Variable-Speed Pumped Storage Plant in Isolated Power Systems," Energies, MDPI, vol. 16(3), pages 1-16, January.

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