Journal of Power Electronics

  • 제22권2호
  • /
  • Pages.210-221
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  • 2022
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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DOI QR코드

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MRAS-based current estimator for DC-DC converters considering time-variant load impedance

  • Singh, Shubham Kumar (Department of Electrical and Electronic Engineering, Birla Institute of Technology) ;
  • Matwankar, Chetan S. (Department of Electrical and Electronic Engineering, Birla Institute of Technology) ;
  • Jee, Manan (Department of Electrical and Electronic Engineering, RTC Institute of Technology) ;
  • Alam, Aftab (Department of Electrical and Electronic Engineering, Birla Institute of Technology)
  • 투고 : 2021.04.13
  • 심사 : 2021.11.23
  • 발행 : 2022.02.20
⟨ 이전 논문 다음 논문 ⟩

초록

The integration of the multiple renewable energy sources (RESs) into a common grid requires a DC bus to be connected with the AC bus of the utility grid using an interlinking converter between the two buses. The DC bus is formed by multiple DC-DC converters fed by RESs. To maintain a fixed DC bus voltage, all of the converters are controlled in a closed loop. The number of DC-DC converters along with the number of corresponding voltage and current sensors becomes staggeringly high for a large number of distributed energy resources (DERs) based systems. Therefore, this paper embarks on state estimation-based closed-loop control of DC-DC converters to significantly reduce the number of sensors. Here, the state variable of the DC current is estimated using a model reference adaptive system (MRAS) for eliminating the current sensors from the hardware design. This estimated state, along with the measured state (capacitor voltage), is used in the state feedback-based closed-loop control of the DC-DC converter. A hardware prototype of a solar photovoltaic (SPV) fed 5 kW boost converter was built and controlled using the proposed current estimator. The experimental results establish the accuracy of the performance parameters of the proposed current estimator.

키워드

과제정보

This project is funded by Science and Engineering Research Board, DST, Govt. of India with sanctioned order number ECR/2018/002037.

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