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2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
Power quality (PQ) problems of AC railway systems have become a major obstacle so that over the years different compensation methods have been introduced to dominate them. Railway Power Quality Compensator (RPQC) is one of the effective strategies which had been presented with different structures and compensation methods. However, these conditioners basically have high capacity and also high potential...
This paper offers a new structure of active power factor correction (APFC) circuit that can be used in single phase AC/DC rectifiers. The proposed design concentrates on controlling the operation time of the main capacitor in such a way that the third order harmonic component can be eliminated at the input source side effectively. This method has been designed and simulated using LTspice-simulink...
In high power applications such as static synchronous compensator (STATCOM) used for reactive power compensation, it is essential to reduce semiconductor losses and associated cost to a minimum value while maintaining desired key attributes. This paper presents a new hybrid switching STATCOM that addresses the semiconductor device losses while ensuring the usual STATCOM operating criterion. Design...
Currently, railway systems are electrified to meet the rising demand for faster speed, more stable operation and more passenger traffic. Although special electrical traction systems are utilized to provide power for railway load consumption, major power quality challenges are present. This paper addresses the Volt/VAR control problem in railway power systems (RPS) considering distributed generations...
Power system stability is a serious concern of power system engineers and utilities especially after the recent occurrences of major events of black outs. Power factor improvement devices such as capacitors, optimally placed in series or shunt in any given network can improve its voltage as well as angular stability. Thermal limits of lines can be observed as the system is visible at all times through...
NarrowBand PLC (NB-PLC) are presently considered as an attractive communication system in the so called advanced metering infrastructure (AMI). Noise characterization is then very useful to determine the actual potential of NB-PLC for communication services towards the so called home prosumer in the frequency range 10–500kHz. In this paper we will present a comprehensive comparison and analysis of...
This paper focuses on the determination of the Channel Frequency Response (CFR) for a length of power cable which is crucial in determining the channel performance. The per-unit-length (PUL) parameters of a power line cable is used to calculate the CFR theoretically. This is verified by real world measurement. A new approach is introduced to model the PUL parameters. This work focus on characterizing...
We propose a digital architecture for selective coordination between low voltage circuit breakers. An Ethernet link is used to interchange telegrams, according to a dedicated protocol, which contain status and alarms, including protection pickup and current direction. Telegrams are sent and received by circuit breakers, which can then enable, delay or block trip according to the received information...
In this work, the self-scheduling problem of a power producer in smart grids is addressed using a stochastic programming approach. Different uncertainties are considered as price uncertainties, forced-outage of the unit as well as generation reallocation. The conditional value-at-risk index is used for modeling of risk. The markets considered in this study are bilateral contracts, day-ahead and ancillary...
Implementing an applicable demand response (DR) program enables the complete demand-side potentials and ensures a secure, more economic and greener operation of the power systems with the integration of renewable energy. Therefore, the present paper proposes a stochastic security-constraint scheduling approach for optimum operation of both supply and demand sides via well-designed pricing and incentive...
This paper presents the comparative analysis of most commonly used Maximum Power Point Tracking (MPPT) techniques viz Open Circuit Voltage (OCV), Perturb and Observe (PnO) and Incremental Conductance (INC) methods that are capable of extracting maximum power from the PV generation system with Soft Switched Interleaved Flyback(SSIFB) converter. The OCV technique is an indirect MPPT method that tracks...
Z-source neutral-point clamped multilevel inverter (Z-NP-MLI) used in solar grid connected applications due to their better performance related to conventional inverters. Normally, current controller based Pulse Width Modulation (PWM) approach is expected for any grid connected system. The space vector pulse width modulation (SVPWM) strategy is a prominent modulation technique for Z-source multilevel...
In the smart grid scenario, Demand Response (DR) and Demand Side Management (DSM) programs are considered as strategic to obtain a more efficient operation of the grid. The flexibility given by the final customers plays a key role to unlock the potential benefits offered by the application of these schemes. A classical example of flexible load that can be exploited for DR and DSM purposes is the electric...
The AC 2×25 kV power supply system is a widespread solution in high-speed railway networks. Owing to the operation of high-power trains in these systems, the 4Q converter generates a high amount and wide spectrum of harmonic currents, which may interface with the signaling systems, communication devices and utility power systems. In this paper, a new Active Railway Power Quality Compensator (ARPQC)...
This contribution presents a mathematical tool for analytical calculation of the optimum switching frequency and transformer parameters of a switching power supply utilizing a two-switch forward converter. The calculations are based on minimization of total power loss of the converter with given switching semiconductors and size of transformer and inductor core. This allows the designer to construct...
This paper deals with optimal coupling issues between rectennas and harvesting circuits. An optical rectenna consists of a nanoantenna usually coupled with an ultra-high speed rectifier. These devices aim to receive and convert solar and thermal radiation in a DC voltage, while a harvester circuit provides the energy to be stored. The rectenna impedance is influenced both by its structure and by the...
Power stability based on energy storage systems to share the load between distributed generations (DG) in island mode is the main issue in the microgrids (MGs). Stability is an important component in energy management and planning of MG. At the first part of this article, definitions and stability issues classification are presented. In this article, power control based on active power method is analyzed...
This paper introduces an optical sensor, considering attenuation variance of input and output fibres using technical ripple current to determine the magnitude of direct current. Changing attenuation varies the characteristic curve of the sensor transfer function. Therefore changed attenuation has to be detected and its effect needs to be compensated. It needs to be differentiated, if input or output...
A complex power converter system is realized with only 4H-SiC devices. It is a DC/AC power converter with an isolation of 4kVdc and made by two stages: a DC/DC Phase Shift Full Bridge converter and a DC/AC full bridge inverter. The input voltage is 48Vdc and the output is 132Vrms with a frequency of 50Hz and 400Hz. The DC/DC PSFB is controlled at a frequency of 100kHz with an integrated circuit, whereas...
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