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This paper presents a new method to improve the DC voltage response on the load change of a three-phase power converter space vector PWM with current regulator. The line current reference is generated from the load current referred to as control-side and the output of PI controller driven by DC voltage error. The load current estimation can be obtained by using the Luenberger observer. A simplified...
This paper proposes the theory and application of a new designing method of the Fractional Order PID (FOPID) controller for boost converters. FOPID is a PID where the derivation and integration orders are of fractional order rather than integer. A FOPID is an extension to classic integer order PID controllers, that potentially promises better results. The method is based on the use of a Multi-Objective...
This paper presents a new fast response digital PID control circuit for dc-dc converter, its dynamic characteristics and the design criterion. In the conventional digital PID control method, the sampling rate is single and the calculation process of P-I-D control is series. On the other hand, in the proposed method, the sampling rate is divided each sampling period. The calculation process of P and...
In this paper, a bidirectional converter for hybrid electrical vehicles addressing high efficiency and digital control is proposed. It is based on two switching converters linked through a high frequency transformer and exploits soft-switching technique and an active-clamp circuit. Operating principle, theoretical analysis and design guidelines are provided, as well as simulation and experimental...
In order to use hydrogen fuel cells in domestic applications either as main power supply or backup source, their low DC output voltage has to be matched to the level and frequency of the utility grid AC voltage. Such power converter systems usually consist of a DC-DC converter and a DC-AC inverter. A double inductor step-up push-pull converter is investigated in this paper, presenting simulation and...
The use of the Doubly-fed Induction Generator (DFIG) in large wind turbines is growing rapidly. In order to investigate the dynamic response of a variable speed wind energy conversion system with DFIG connected to the power system during grid disturbance, a model has been developed. This model includes aerodynamics, the mechanical drive train, the induction generator as well as the control parts....
A combination of optimization practices both for continuous and discrete parameters optimization is carried out, based on particle swarm optimization, and is applied to power circuit design. The system under optimization is an active rectifier, operated by means of a resonant controller and utilized to set sinusoidal input waveforms in system grid.
The main problem of the renewable energies is their stochastic availability. To compensate it, energy storage is necessary. The short time turbulent power pulsation can be balanced by flywheel energy storage drive. This paper deals with this method focusing mainly to the wind power applications. After the theoretical considerations of the system the possible drive types and the limits of the operation...
This paper presents a novel smart digital control method using P-I-D control and a model control. This control circuit is able to detect not only the average output voltage but also the input voltage and the output current to improve the dynamic characteristics. As a result, the undershoot of the output voltage, the overshoot of the reactor current and convergence time of the output voltage are improved...
This paper presents an analog implementation of a digitally reprogrammable control for fixed frequency switching power converters. It is a recursive discrete time filter based on switched capacitor delay cells. The proposed circuit allows to synthesize different transfer functions in order to cope with the modifications in dynamics of power converters due to inputs or parameters variations. A prototype...
This paper describes scheduled modernization of the laboratory working stand for a hybrid-electric drive. This paper describes the existing hybrid electric drive model and analyses previous research done by our department in the function of hybrid engines. Thereinafter, some defects in the current circuit are described. The last part of this paper describes the design of a new converter, which should...
Flying Capacitor (FC) multilevel Pulse Width Modulated (PWM) converters are an attractive choice due to the natural balancing property of the capacitor voltages. The balancing can be studied in the time domain, which results in easy to interpret expressions regarding parameter influence. Time domain analysis is normally done by time averaging of the system model over a PWM-period. In this paper a...
Power factor correction converters are nonlinear power electronics circuits used as AC-DC power supplies and due to their nonlinearity they exhibit nonlinear phenomena such as sub-harmonic oscillations and chaotic regimes. These undesirable behaviors increase the total harmonic distortion and therefore can jeopardize enormously the system performances. In this paper, a notch filter based controller...
Three-level converters are widely utilized by industries thanks to the advantages of less dv/dt and less frequency common mode voltage in comparison to conventional two-level PWM inverters. Since these converters utilize switches as fully on or fully off elements and they feed a floating output system, common mode voltage will be unavoidable. This paper presents a comprehensive analysis of common...
The concern on observed climate change has increased the utilization of renewable energy sources. The harvesting of solar energy is recognized as one of the key issues in reducing green house gas emission. Reliable solar-energy systems composing of solar arrays and their interfacing converters are of prime importance in uninterrupted solar energy production. The interfacing maximum-power-point converters...
The paper introduces an effective toolbox for engineers, researchers and students to design and study electric drives. The described package eDrive includes a database of motors, power converters, and gears, an object-oriented simulator, a virtual signal generator, the module of the torque/current, speed, and path controllers, as well as the suitable visual interface. The system provides for the development,...
This paper presents an adaptive PWM control scheme of four-cell interleaved boost-type switching-mode rectifier, used as an input stage of auxiliary power supply of electrical vehicles, and its operation under regular, as well as under specific operating conditions - failure of one or more IGBTs.
This paper presents a control scheme for microgrids with passive loads. The existing control techniques for distributed generation systems are designed to operate either in the grid-connected or in the islanded mode. In the grid-connected mode of operation, a current-controlled scheme based on d-q variables is used for the regulation of real and reactive powers of the converter. In the islanded mode...
This paper presents a safe start-up procedures of an isolated bi-directional DC-DC converter in buck and boost modes. This converter has been developed as a part of multifunctional up to 4 kW power supply system that uses a high voltage (450 V) DC-link. The isolated bi-directional DC-DC converter can charge 28 V batteries and supply auxiliary low voltage DC loads. Additionally, the isolated bidirectional...
This paper deals with comparison of two different control strategies of traction single-phase current-source active rectifier from the viewpoint of robustness, computation demands, control possibilities, quality and limitations and implementation tasks. Proper function of considered controls has been verified by simulations and experiments on designed laboratory prototype of CSAR.
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