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Analytical approach to assess the loadability of unbalanced distribution grid with rooftop PV units

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  • Yaghoobi, Jalil
  • Islam, Monirul
  • Mithulananthan, Nadarajah

Abstract

Photovoltaic (PV) power is a promising source of renewable energy, which is expected to provide a significant share of electrical energy in the near future. However, a stable voltage condition of the system must be always insured even with a high level of PV penetration. It should be noted that a large portion of PV systems are single-phase and they are being integrated into distribution network (DN). In addition, the DNs are unbalanced due to their loads and line characteristics. As a result, it is necessary to investigate the impact of power from both single and three phase PV units on the voltage stability of unbalanced DN. This paper has proposed an analytical methodology to investigate the static voltage stability of unbalanced DN with high PV penetration considering both single and three phase connections. For this purpose, the loadability of general unbalanced distribution system and how it is affected by PV power is analytically investigated for both single and three phase PV integration scenarios. In addition, the impact of reactive power capability of PV systems on the loadability has been assessed. Analytical outcomes are further studied and justified using results from IEEE 37-bus DN. Presented results conclude that both unbalanced system, and single and three phase PV penetrations must be taken into account to accurately assess the static voltage stability of practical DN.

Suggested Citation

  • Yaghoobi, Jalil & Islam, Monirul & Mithulananthan, Nadarajah, 2018. "Analytical approach to assess the loadability of unbalanced distribution grid with rooftop PV units," Applied Energy, Elsevier, vol. 211(C), pages 358-367.
    • Handle: RePEc:eee:appene:v:211:y:2018:i:c:p:358-367
    DOI: 10.1016/j.apenergy.2017.11.030
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    2. Chen, Jianhong & Zhang, Youlang & Li, Xinzhou & Sun, Bo & Liao, Qiangqiang & Tao, Yibin & Wang, Zhiqin, 2020. "Strategic integration of vehicle-to-home system with home distributed photovoltaic power generation in Shanghai," Applied Energy, Elsevier, vol. 263(C).
    3. Wang, Licheng & Yan, Ruifeng & Saha, Tapan Kumar, 2019. "Voltage regulation challenges with unbalanced PV integration in low voltage distribution systems and the corresponding solution," Applied Energy, Elsevier, vol. 256(C).
    4. Joel Alpízar-Castillo & Laura Ramirez-Elizondo & Pavol Bauer, 2022. "Assessing the Role of Energy Storage in Multiple Energy Carriers toward Providing Ancillary Services: A Review," Energies, MDPI, vol. 16(1), pages 1-31, December.
    5. Amir, Asim & Amir, Aamir & Che, Hang Seng & Elkhateb, Ahmad & Rahim, Nasrudin Abd, 2019. "Comparative analysis of high voltage gain DC-DC converter topologies for photovoltaic systems," Renewable Energy, Elsevier, vol. 136(C), pages 1147-1163.
    6. Chaminda Bandara, W.G. & Godaliyadda, G.M.R.I. & Ekanayake, M.P.B. & Ekanayake, J.B., 2020. "Coordinated photovoltaic re-phasing: A novel method to maximize renewable energy integration in low voltage networks by mitigating network unbalances," Applied Energy, Elsevier, vol. 280(C).

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