An Improved Photovoltaic Power Reserve Control with Rapid Real-Time Available Power Estimation and Drift Avoidance

Yinxiao Zhu, Huiqing Wen, Qinglei Bu, Xue Wang, Yihua Hu, Guipeng Chen

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The main challenges in designing the power reserve control (PRC) lie in the rapid estimation of the maximum available power (<inline-formula><tex-math notation="LaTeX">$P_\mathrm{avi}$</tex-math></inline-formula>) in real-time and effective drift avoidance under the condition of fast-changing irradiation. Conventional PRC strategies utilize direct measurement or curve-fitting-based estimation to determine the <inline-formula><tex-math notation="LaTeX">$P_\mathrm{avi}$</tex-math></inline-formula>, which shows obvious limitations, such as extra hardware, implementation complexity, and slow estimation speed. Meanwhile, the drifted reserved power (<inline-formula><tex-math notation="LaTeX">$\Delta P$</tex-math></inline-formula>) may deteriorate the dynamic response performance, bring high dc-link over-voltage risk, and affect the system operation stability due to the voltage-step-<inline-formula><tex-math notation="LaTeX">$\Delta P$</tex-math></inline-formula> regulation mechanism in conventional PRC methods. To address these issues, an improved PRC strategy with a fast <inline-formula><tex-math notation="LaTeX">$\Delta P$</tex-math></inline-formula> transient mechanism is proposed with the rapid estimation of <inline-formula><tex-math notation="LaTeX">$P_\mathrm{avi}$</tex-math></inline-formula> through just one pair of PV voltage and current sampling. Thus, the proposed algorithm is cost-effective, easy to implement, and compatible with existing PV systems since no additional hardware components are required. Moreover, the proposed PRC breaks through the inherent limitation of the voltage-step-<inline-formula><tex-math notation="LaTeX">$\Delta P$</tex-math></inline-formula> mechanism, which can ensure the <inline-formula><tex-math notation="LaTeX">$\Delta P$</tex-math></inline-formula> drift mitigation even under fast-changing weather conditions. Main experimental comparisons with other advanced PRC strategies were conducted to verify the advantages of the proposed algorithm in terms of rapid real-time available power estimation and drift avoidance.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume70
Issue number11
DOIs
Publication statusAccepted/In press - 2022

Keywords

  • Active power control
  • Codes
  • drift phenomenon
  • Estimation
  • Ions
  • maximum available power estimation
  • photovoltaic system
  • Photovoltaic systems
  • power reserve control
  • Real-time systems
  • Temperature measurement
  • Temperature sensors

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