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

Shubham Kumar Singh; Chetan S. Matwankar; Manan Jee; Aftab Alam

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

Vol. 22, No. 2, pp. 210-221, Feb. 2022

10.1007/s43236-021-00353-2

Renewable energy sources

Distributed energy resources

Model Reference Adaptive System

State estimation

Boost converter

Hybrid micro-grid

Abstract

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.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

S. K. Singh, C. S. Matwankar, M. Jee, A. Alam, "MRAS‑based current estimator for DC–DC converters considering time‑variant load impedance," Journal of Power Electronics, vol. 22, no. 2, pp. 210-221, 2022. DOI: 10.1007/s43236-021-00353-2.

[ACM Style]

Shubham Kumar Singh, Chetan S. Matwankar, Manan Jee, and Aftab Alam. 2022. MRAS‑based current estimator for DC–DC converters considering time‑variant load impedance. Journal of Power Electronics, 22, 2, (2022), 210-221. DOI: 10.1007/s43236-021-00353-2.