EPE Journal Volume 21-3 
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EPE Journal Volume 21-3 - Editorial
EPE Journal Volume 21-3 - Papers
EPE Journal Volume 21-3: Other
 

  

 

 EPE Journal Volume 21-3 - Editorial 

Invitation to EPE-PEMC 2012 ECCE Europe Novi Sad  [Details]
By Vladimir Katic; Dushan Boroyevich
The editorial of EPE Journal Volume 21-3, Invitation to EPE-PEMC 2012 ECCE Europe Novi Sad, written by Vladimir Katic and Dushan Boroyevich

 

 EPE Journal Volume 21-3 - Papers 

Environmental Aspects of Manufacturing and Disposal of Power Electronics Equipment  [Details]
By Francisco Javier Hurtado Albir; José Antonio Carrasco Hernández
The penetration of electronics in any area of technology is a potential problem because of the manufacturing aspects but also because of the generation of waste that cannot be treated conventionally. This appears to be far away from power electronics, but not only industrial power electronic must be considered: each electronic unit has an embedded power supply. The presence in a power electronics converter of compounds such as, chromium, cadmium, mercury and lead, makes that this kind of waste be recycled or safely disposed. The environmental effects associated with the manufacture of power converters should not be overlooked, particularly semiconductor manufacturing, with a high environmental impact because of the use of toxic elements, but also because the large amounts of energy consumed. WEEE and RoHS directives of the European Commission have been introduced contributing to solve these problems. They have had a direct impact in the electric and electronic industries and, therefore, also in the power electronics technology (Fig. 2).

An Isolated Bi-directional DC/DC Converter using Unregulated LLC Resonant Converter and Its Design  [Details]
By Jun-Young Lee
This paper presents an isolated bi-directional DC/DC converter comprised of two stages with a hard-switched nonisolated converter and an unregulated LLC converter. The LLC converter operates as an isolated voltage amplifier with a constant voltage gain and the output control can be achieved through the non-isolated converter. By separating functions, the unregulated LLC converter can be designed to have a low switching loss regardless of load conditions. It gives the size reduction of transformer by increasing the switching frequency and a good efficiency under wide load ranges. Furthermore, since the proposed converter uses same gate control scheme for bi-directional control, control is simple and similar efficiencies can be expected under operational modes. Design guidelines based on loss analysis and the experimental results with a 2 kW prototype converter are provided in this paper.

New Topologies for Static Reactive Power Compensators Based on PWM AC Choppers  [Details]
By P. Ladoux, Y. Chéron, A. Lowinsky, G. Raimondo, P. Marino
Nowadays, static reactive power control is widely used in electrical power networks. The former solution based on Thyristor Controlled Reactors is progressively replaced by PWM Voltage Source Inverters. The first solution is quite simple but requires bulky shunt passive filters whereas the second solution shows higher semiconductor losses and requires a significant cooling system. In this paper, the authors present new topologies which show a good compromise in comparison to the classical solutions. Single phase AC Choppers are used to achieve controlled impedances (capacitive or inductive) at the fundamental frequency and thus adjust the reactive power level. This concept is applied for medium or high power applications and multi-converter structures based on step down or step up AC choppers are proposed. An example of design concerning reactive power compensation in a 25 kV/50 Hz AC traction line is presented. Finally, experimental results obtained for a 1.2 MVAR prototype demonstrate the feasibility of these novel topologies.

A Simple Method For Real-Time Detection Of Voltage Sags and Swells in Practical Loads  [Details]
By P. Meena; K. Uma Rao; Ravishankar Deekshit
This paper presents an algorithm for real time detection of short duration voltage disturbances that occur in single phase power supply systems. The method used involves the use of a sliding, overlapping window of fixed size for measuring the RMS (root mean square) value of the voltage signal. The RMS value of a fixed number of voltage samples, is computed over a cycle, and this value is updated over a sample period by the overlapping window. A trigger signal is generated in response to the comparison of the RMS values between two consecutive cycles of the voltage signal. The trigger thus obtained, can be used to initiate the operation of the main control system of a Dynamic Voltage Restorer (DVR) to be used in conjunction with the detection unit to mitigate the sag or swell, or as a triggering function to a digital recorder to record the occurrence of the disturbance. The modeling of the algorithm and test of its functioning was carried out in Matlab – Simulink environment. Reliability of the functioning of the algorithm under conditions of noise and change in the nature of the sag and swell in the voltage signal was tested on real data acquired during events such as starting of induction motor, intermittent loading of welding transformer, and dynamic loading of a captive diesel generator. TMS320F6713 Digital Signal Processor used for the implementation of the algorithm has been programmed through the Matlab embedded link for code composer studio. The experimental set up consists of a digital signal processor (DSP) TMS320C6713, for generation of trigger, a personal computer for record of the parameters and is successfully tested for real time disturbance detection.

 

 EPE Journal Volume 21-3: Other 

EPE-PEMC 2012 ECCE Europe - Call for Papers  [Details]
By Vladimir Katic; Dushan Boroyevich
EPE-PEMC 2012 ECCE Europe - Call for Papers