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Advanced Frequency Support Strategy of Double-Stage Grid-Connected PV Generation

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Abstract

With an increasing penetration of PV generation in the electrical grid, the increasing replacement of large conventional synchronous generators by PV generation will result in deteriorated frequency regulation performance due to the reduced system inertia response. It is urgent for PV generation to take part in frequency regulation. In this paper, three virtual inertial control strategies are proposed for double-stage grid-connected PV generation: virtual inertial control based on the dynamics of phase-locked loop (PLL), virtual inertial control based on the dynamics of low voltage DC capacitor, virtual inertial control based on the dynamics of high voltage DC capacitor. The influence of control parameters on virtual inertial control strategies is also analyzed. Besides, in order to get an even better frequency behavior, a coordinated control strategy between PV generation and conventional synchronous generators (SGs) is also proposed. Finally, the theoretical analysis and control strategies are verified by simulation results.

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Acknowledgements

This work is supported by Research Program of State Grid Corporation of China (Study on active frequency and voltage control technologies for second level power disturbance in photovoltaic power plant, Research and Application of Distributed PV Power Generation Wide-area Monitoring Analysis and Global Force Estimation).

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Authors and Affiliations

  1. School of Eletrical Engineering, Northeast Electric Power Univerity, Jilin, China

    Mingshuang Sun, Qi Jia & Zhenhao Wang

  2. National Electric Power Dispatching and Communication Center, Beijing, China

    Zheyi Pei & Cun Dong

  3. Power Dispatching Control Center of State Grid, Jiangsu Electric Power Co., Ltd, Nanjing, China

    Xin Jin

Authors
  1. Mingshuang Sun
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  2. Qi Jia
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  3. Zheyi Pei
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  4. Cun Dong
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  5. Zhenhao Wang
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  6. Xin Jin
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Corresponding author

Correspondence to Qi Jia.

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Appendix A

Appendix A

See Fig. 24 and Tables 2, 3.

Fig. 24
figure 24

P–U curves

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Table 2 The fitting results (S = 1000 W/m2)
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Table 3 The fitting results (S = 800 W/m2)
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Sun, M., Jia, Q., Pei, Z. et al. Advanced Frequency Support Strategy of Double-Stage Grid-Connected PV Generation. J. Electr. Eng. Technol. 14, 2239–2250 (2019). https://doi.org/10.1007/s42835-019-00263-1

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  • DOI: https://doi.org/10.1007/s42835-019-00263-1

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