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Owing to the increasing number and power rating of static power converter (SPC) based systems the need arises for distributed power generation systems to take part in the control-related issues of power generation. The requirements for large and small power generation systems differ from the aspect of utility interaction. Measures to avoid and compensate the appearance of, and to reduce the possibility...
This paper presents a multi-drive system based on two-stage direct power converter with two motors on the same shaft. In this, the requirement of DC-link components is eliminated to save weight and volume of the system. The functionality of proposed multi-drive system confirm by simulation results and validated by experiments on a laboratory prototype.
A review of the state of the art in the sliding-mode control of DC-to-DC switching converters is presented. The method of the equivalent control is illustrated in the design of a two-loop control for the voltage regulation of a buck-boost converter. The theoretical predictions are validated by means of PSIM simulations. Prospective applications of the method reported are also discussed.
This paper presents an investigation into the thermal behavior of a DC-DC converter integrated on the back side of a thin-film photovoltaic (PV) module. Analytical thermal models of the converter and the PV module are made and the results obtained from the models are compared to the results obtained by computational fluid dynamics (CFD) simulations.
This paper introduces a new designed diesel-electric power-supply unit developed for military purposes. The power-supply unit is divided to two main electric parts, (i) input part which is composed of a sensorless controlled active voltage source rectifier supplied by a permanent magnet synchronous generator, and (ii) output part which is composed of a four-leg three-phase voltage source inverter...
This paper describes the high efficiency drive unit for an EV, which is designed with accessible solutions for the efficiency increasing. Synchronous utilization of ultracapacitors and three-level inverter brings considerable power savings and enhancement longevity for a lithium battery pack. The total loss and EMI comparison between the two-level and three-level inverter and power measurements on...
Several proposals for using of power derived from regenerative braking in railway systems are available. We present an energy recovery system with feedback to the distribution grid based on a new converter topology; the dimensioning methodology of the system is based on real data intake and validated simulations. The new converter topology presented is based on the connection in cascade of a DC/DC...
In this paper the parameters for choosing an electric drive for an electric kart have been analyzed. The advantages and disadvantages of different electric drive configurations have been shown while focusing on development of academic research prototype for future use in student education.
Dielectric barrier discharge reactors are often operated using the pulse density modulation technique. A resonant converter topology is proposed with the ability of energy transfer control. Three different circuit topologies are proposed with energy recovery snubber design. System description, simulation results and test-stand waveforms are presented and discussed.
In this paper, an energy recovery system with Electric Double-Layer Capacitor (EDLC) for motor drive systems is presented. The basic principle of the proposed control scheme and the energy losses consumed in an energy recovery system are discussed in detail. Digital computer simulation results indicate that the energy-saving effect by the injection molding machine was improved by 49%.
An analysis and improvement of the direct power control method (DPC) for converter feeding generators in wind power applications under disturbed grid voltages is presented. An improved DPC method is derived and described, and its performance is analyzed as well. This improved DPC permits a robust and dynamic control of active and reactive power even under symmetrical and unsymmetrical voltage sags,...
Phase locked loop (PLL) is an important part of the current-controlled grid-connected converter. Its job is to estimate the phase angle of the grid voltage. If the PLL is not robust, the grid-voltage distortion will lead to an error in the estimated phase leading to a degradable performance of the converter. In this paper, the effect of the PLL on the operation of a current-controlled voltage-source...
The paper brings torque, power, efficiency and harmonic analyses of traction drive with permanent magnet synchronous motor (PMSM) during flux weakening operation. There is one way to weak flux of rotor permanent magnets - armature reaction caused by negative flux producing current component. On the other hand, the flux producing current component increases total RMS value of stator current. This effect...
Current requirements in multi-megawatts electric marine propulsion systems and wind power generation, particularly in off-shore plants, ask for drives with increased power densities. The recently proposed Active Stator (AS) Variable Speed Drive is a clear answer to this demand. A power density increase of up to 2-3 times is anticipated compared to the current state-of-the-art equivalent drives. Such...
The purpose of this paper is to present a new digital model control which detects multiple output values of multiple-output dc-dc converter. In this method, the P-I-D control and the static equation model are performed. The dynamic characteristics of digital control converter are improved as compared with the conventional one.
Some modelling methods and associated tools are presented in this paper to efficiently and accurately simulate the electromagnetic behaviour of power electronic structures. Moreover, as engineers have to face new challenges, the synergy between simulation tools is illustrated as a possible solution for addressing this "multiphysic" topic. The article is also pictured of several application...
This paper presents the using of the converter with SMES to ensure the dynamic (transient) stability of power system. The force commutated converter ensures the power transfer between SMES and power system by the use of microprocessor based control system that realizes spacevector PWM algorithm. It is given the approximate calculation of the required SMES power. Also the results of computer simulation...
An actual problem of the efficiency in machine tools is investigated by the improvement of the active power factor correction. An analysis of one method of the active power factor correction in machine tools is performed. A development of the active power factor correction is offered on the basis of the reduction of the power recovery in an infeed/regenerative module and the expansion of the dc link...
The main disadvantage of applying a standard network driven thyristor rectifiers for a DC motor speed control is the fact that such drives loads the network with reactive power and due to its nonlinear structure network current is nonsinusoidal with a higher harmonics content. Modern development of electronic power components, primarily IGBT and MOSFET switches, allows the replacement of a thyristor...
A method for efficiency optimization of boost converter applied in wind turbine with permanent magnet generator (PMG) is proposed in this paper. This method gives the best results when output power of generator is less than rated value. Its validation is verified through simulation and experimental results.
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