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Static Voltage Stability Zoning Analysis Based on a Sensitivity Index Reflecting the Influence Degree of Photovoltaic Power Output on Voltage Stability

Author

Listed:
  • Sheng Li

    (School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China)

  • Yuting Lu

    (School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China)

  • Yulin Ge

    (School of Electric Power Engineering, Nanjing Institute of Technology, Nanjing 211167, China)

Abstract

The large-scale integration of photovoltaic (PV) power can bring a greatly negative influence on the grid-connected system’s voltage stability. To study the static voltage stability (SVS) of PV grid-connected systems, the traditional SVS index, L-index, was re-examined. It was firstly derived and proved that the PV active output P pv is proportional to the voltage phase angle of the PV station’s POI (Point of Interconnection), based on a simplified two-node system integrated with a PV station operating in PV (active power—voltage) mode or PQ (active power—reactive power) mode with unit power factor. Then a novel voltage stability sensitivity index LPAS-index was proposed that takes the derivative of the L-index with respect to the POI’s voltage phase angle, so as to reflect the influence degree of P pv on the SVS of each load node. A SVS zoning analysis method for the PV grid-connected system was designed according to the classification results of load nodes based on the proposed LPAS-index, the power grid can be zoned into three kinds of areas that reflect different correlations between the SVS and P pv : strong correlation, moderate correlation and weak correlation. Since the LPAS-index is less impacted by P pv , the SVS zoning results are relatively unchanged. On the basis of a classic 14-node system with PV, the practicability of the zoning analysis method was verified. The simulation results show that the PV access point in general falls within the strongly or moderately associated area with P pv . When most of the load nodes fall within the weakly associated area with P pv , it is not necessary to consider the impact of P pv and load power is still the main influencing factor on the SVS. In the multi-PV case, owing to the expansion of areas more affected by P pv , an excessive P pv can cause adverse influence on the SVS of the whole power grid; and an effective PV power-shedding measure is proposed to solve this problem. The proposed SVS zoning analysis method can be used for reference by power grid dispatchers.

Suggested Citation

  • Sheng Li & Yuting Lu & Yulin Ge, 2023. "Static Voltage Stability Zoning Analysis Based on a Sensitivity Index Reflecting the Influence Degree of Photovoltaic Power Output on Voltage Stability," Energies, MDPI, vol. 16(6), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2808-:d:1100434
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    References listed on IDEAS

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    1. Sheng Li & Zhinong Wei & Yanan Ma, 2018. "Fuzzy Load-Shedding Strategy Considering Photovoltaic Output Fluctuation Characteristics and Static Voltage Stability," Energies, MDPI, vol. 11(4), pages 1-18, March.
    2. Ding, Ming & Xu, Zhicheng & Wang, Weisheng & Wang, Xiuli & Song, Yunting & Chen, Dezhi, 2016. "A review on China׳s large-scale PV integration: Progress, challenges and recommendations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 639-652.
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    Cited by:

    1. Sheng Li & Can Zhang & Jili Zuo, 2023. "Long-Term Voltage Stability Bifurcation Analysis and Control Considering OLTC Adjustment and Photovoltaic Power Station," Energies, MDPI, vol. 16(17), pages 1-17, September.
    2. Sheng Li & Changhong Duan & Yuan Gao & Yuhao Cai, 2023. "Classification Study of New Power System Stability Considering Stochastic Disturbance Factors," Sustainability, MDPI, vol. 15(24), pages 1-22, December.

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