Robust controller designed by H∞ loop shaping is complicated and its order is much higher than that of the plant. It is not easy to implement this controller in practical engineering applications. To overcome this problem, we propose an algorithm, GA based fixed-structure H∞ loop shaping control, to design a robust controller. Genetic algorithm is used to solve the H∞ loop shaping design proble...

This paper deals an experimental validation of a nonlinear controller using sliding mode control (SMC) with integral action for dc-dc buck power converter. The main objectives are: i) perfect regulation inductor current unknown load resistance variation, ii) and ensure the asymptotic stability closed-loop system. To this end, SMC is elaborated. Using Matlab-Simulink software, numerical simulati...

Nonlinear systems, such as switching DC-DC boost or buck converters, have rich dynamics. A simple one-dimensional discrete-time model is used to analyze the boost or buck converter in discontinuous conduction mode. Seven different control schemes (open-loop power stage, voltage mode control, current mode control, constant power load, constant current load, constanton-time control, and boundary ...

In this paper, a generalized buck-boost Z-H converter based on switched inductors is proposed. This structure consists of a set of series connected switched-inductor cells. The voltage conversion ratio of the proposed structure is adjusted by changing the number of cells and the duty cycle. Like the conventional Z-H converter, the shoot-through switching state and the diode before LC network ar...

The operation and control of fuel cell (FC) distributed generation (DG) systems combined with energy storage are studied in this paper. For this purpose, modeling of hybrid FC/energy storage DG system is developed. Dynamic models for proton exchange membrane fuel cell (PEMFC), supercapacitor, DC–DC converters, and grid connected inverter are described. Then a PI controller for the FC converter ...

This paper focuses on the non-inverting buckboost converter supplying an adjustable DC voltage to a WCDMA RF power amplifier (RFPA) in order to improve the system efficiency under different transmitted RF power levels. It is shown that precise output voltage positioning and low output voltage ripple over a wide output voltage range, including buck, boost and buck/boost transition modes, can be ...

ISSN: 2319-1112 /V2N2:243-248 ©IJAEEE Abstract : To increase the processing speed and decrease the power consumption, the operating voltages of computer microprocessors is reduced below 1.5V. At the same time, it is expected that these processors will require much more current. To keep the distribution losses low at an increased power level, the input current of the new generation of on-board d...

In this paper a digitally controlled step down converter using fuzzy state space controller is studied. The state controller is designed to eliminate the start-up overshoot and reduce maximal dynamic error of load change response, but the state controller is not capable to eliminate the steady-state error under the load change condition. In order to improve this property, two control algorithms...

This paper deals with the modeling of bond graph buck converter systems. The bond graph formalism, which represents a heterogeneous formalism for physical modeling, is used to design a sub-model of a power MOSFET and PiN diode switchers. These bond graph models are based on the device’s electrical elements. The application of these models to a bond graph buck converter permit us to obtain an in...

This article proposes a new active power flow controller for dc–dc multiactive bridge (MAB) converters with minimum current point tracking (MCPT) to minimize conductive losses. Unlike recent efforts in this area, the proposed does not require look-up table implementation nor complex nonlinear converter modeling and is circuit parameter dependent. The control scheme also generalized MAB any numb...