Deepali Doliya

Bio: Deepali Doliya is an academic researcher from Rajasthan Technical University. The author has contributed to research in topics: Buck converter & Line regulation. The author has an hindex of 2, co-authored 2 publications receiving 9 citations.

Feedback and feedforward control of buck converter with parasitics

Abstract: In this paper, the state-space averaging technique is used to obtain the model of complete buck converter system with parasitic resistances in continuous conduction mode. A lag-lead compensator is designed as a controller to improve bandwidth and steady-state accuracy. Two control methods are described, one with the feedback control only to regulate the output voltage and another method includes a feedforward gain to achieve a good line regulation and results are compared. It is shown that with feedforward gain, the overshoot is reduced and there is no transient due to the input voltage disturbance. The results of buck converter system are verified through simulation.

An LMI approach for robust LQR control of PWM buck converter with parasitics

Abstract: In this paper, a polytopic model of an uncertain buck converter with parasitic resistances is obtained in continuous conduction mode. Although linear quadratic regulators (LQRs) provide good stability and are optimal but they do not ensure robustness for the highly uncertain system. Therefore, A robust LQR designing method for power converters is presented using linear matrix inequalities (LMIs) to ensure robust stability of highly uncertain systems and the output is analyzed in the presence of line and load perturbations. In addition, an input voltage feedforward gain is included in this closed loop converter system to achieve a good line regulation. It is shown that with feedforward, there is no transient due to the line voltage perturbations. The results of the proposed approach are verified through simulation.

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Power Electronics Converters Applications And Design

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Controller design for MTDC grid to enhance power sharing and stability

Abstract: Voltage droop control is considered as a reliable control approach for multi-terminal DC (MTDC) grid system. A low value of droop constant may result in a high dynamic variation associated with oscillations for power and DC voltage deviation. Thus, the stability of the MTDC grid is at risk. This study presents a linear quadratic regulator (LQR) control design with an adaptive droop to achieve appropriate power sharing among the converter terminals. A control strategy with the combination of adaptive droop and LQR is designed in this study. The weights of LQR are tuned using the Gramian analysis. The closed-loop stability analysis is carried out using Lyapunov's stability approach. The proposed control scheme improves the closed-loop system dynamics by reducing the overshoots/undershoots and time to reach steady-state condition. In addition, power sharing according to converter rating is appropriately achieved. The performance of the proposed control scheme is validated on five terminal MTDC grid system simulated in MATLAB®.

An LMI approach for robust LQR control of PWM buck converter with parasitics

Abstract: In this paper, a polytopic model of an uncertain buck converter with parasitic resistances is obtained in continuous conduction mode. Although linear quadratic regulators (LQRs) provide good stability and are optimal but they do not ensure robustness for the highly uncertain system. Therefore, A robust LQR designing method for power converters is presented using linear matrix inequalities (LMIs) to ensure robust stability of highly uncertain systems and the output is analyzed in the presence of line and load perturbations. In addition, an input voltage feedforward gain is included in this closed loop converter system to achieve a good line regulation. It is shown that with feedforward, there is no transient due to the line voltage perturbations. The results of the proposed approach are verified through simulation.