Voltage regulation of buck converter with constant power load: An adaptive power shaping control

We establish a novel hybrid model of a continuous conduction mode buck converter with a constant power load based on the mixed logical dynamical modeling method. Based on the proposed model, the influence of the constant power load’s negative impedance (RCPL) on the dynamics of the buck converter with a constant power load is studied by computing bifurcation diagrams and the spectrum of the largest Lyapunov exponents with the variation of the absolute value of RCPL. Numerical results show that the system’s bifurcations exhibit two different types of behavior, namely, Hopf bifurcations and state jumping. Moreover, the accuracy and effectiveness of the established mathematical model are verified via simulation and experimental results. Because of including different discrete mappings of the system exhibited in different working modes in a unified model, the proposed hybrid model solves the problem of choosing different discrete mappings according to different working models. That is, the hybrid model in this paper provides a new unified model for future research on the dynamic properties and design of controllers for such systems.

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Voltage Regulation in Buck–Boost Converters Feeding an Unknown Constant Power Load: An Adaptive Passivity-Based Control

IEEE Transactions on Control Systems Technology ◽

10.1109/tcst.2019.2959535 ◽

2021 ◽

Vol 29 (1) ◽

pp. 395-402

Author(s):

Carlos A. Soriano-Rangel ◽

Wei He ◽

Fernando Mancilla-David ◽

Romeo Ortega

Keyword(s):

Voltage Regulation ◽

Unknown Constant ◽

Constant Power ◽

Boost Converters ◽

Power Load ◽

Passivity Based Control ◽

Constant Power Load

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Dynamics of a buck converter with a constant power load

PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196) ◽

10.1109/pesc.1998.701881 ◽

2002 ◽

Cited By ~ 78

Author(s):

V. Grigore ◽

J. Hatonen ◽

J. Kyyra ◽

T. Suntio

Keyword(s):

Buck Converter ◽

Constant Power ◽

Power Load ◽

Constant Power Load

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Voltage Regulation of an Isolated DC Microgrid with a Constant Power Load: A Passivity-based Control Design

Electronics ◽

10.3390/electronics10172085 ◽

2021 ◽

Vol 10 (17) ◽

pp. 2085

Author(s):

Guillermo Luciano Magaldi ◽

Federico Martin Serra ◽

Cristian Hernán de Angelo ◽

Oscar Danilo Montoya ◽

Diego Armando Giral-Ramírez

Keyword(s):

Control Strategy ◽

Reference Value ◽

Voltage Regulation ◽

System Stability ◽

Constant Power ◽

Dc Microgrid ◽

Photovoltaic Array ◽

Power Load ◽

Constant Power Load ◽

Averaged Model

Passivity-based nonlinear control for an isolated microgrid system is proposed in this paper. The microgrid consists of a photovoltaic array and a battery energy storage connected to a point of common converters, supplying a constant power load. The purpose of this control strategy is to maintain the output direct current voltage in its reference value under load variations, improving battery interaction. The system is represented by its state space averaged model and the proposed controller is designed using the interconnection and damping assignment strategy, which allows obtaining controller parameters while ensuring the closed-loop system stability. The unknown constant power load is estimated using an observer based on the energy function of the system. The behavior of the proposed control strategy is validated with simulation and experimental results.

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