Harmonic distortion Research Papers - Academia.edu (original) (raw)

Electricity metering plays a crucial role for all the commercial transactions on the energy market. Thus, an accurate evaluation of the performance of the electricity metering equipment is required not only in the reference operating... more

Electricity metering plays a crucial role for all the commercial transactions on the energy market. Thus, an accurate evaluation of the performance of the electricity metering equipment is required not only in the reference operating conditions but also in the presence of disturbances affecting the power systems. As regards this matter, this paper analyzes the main aspects related to the

This article details a new transfer function approach in passive harmonic filter design for industrial and commercial power system applications. Filter placement along with six common filter configurations are presented. Harmonic... more

This article details a new transfer function approach in passive harmonic filter design for industrial and commercial power system applications. Filter placement along with six common filter configurations are presented. Harmonic impedance, voltage division and current division transfer functions are derived and used in a practical filter design procedure that incorporates IEEE-519 distortion limits directly into the design and component

This paper introduces a new neural method for harmonic identification and compensation. Based on Adaline networks, the proposed method is called the diphase currents method. The architecture and the learning are formulated based on an... more

This paper introduces a new neural method for harmonic identification and compensation. Based on Adaline networks, the proposed method is called the diphase currents method. The architecture and the learning are formulated based on an original decomposition of the disturbed currents. These currents are converted in the alphabeta- or DQ-spaces to separate each harmonic component in a linear expression. In this harmonic compensation method, the harmonic components may be individually selected and the reactive power may be compensated. The proposed method is robust and has been efficiently compared to other conventional and neural harmonic compensation methods. In order to validate the performance of the diphase currents method, simulation studies are carried out in the presence of plant variations. Experiments are also presented to show the performance of the proposed neural method under many practical industrial conditions.

Three-level NPC active-front-end three-phase (3LAFE) converters can be applied to high-power medium voltage applications, with 4-quadrant unity-power-factor operation, allowing a broad range for power conversion systems, such as... more

Three-level NPC active-front-end three-phase (3LAFE) converters can be applied to high-power medium voltage applications, with 4-quadrant unity-power-factor operation, allowing a broad range for power conversion systems, such as decentralized energy distribution and utilization. Switching losses and network interaction limit the operation of 3LAFE high-power converters, especially when GTO-converters are used.

Light-emitting diode (LED) nonlinear differential gain (DG) and differential phase (DP) were measured, since they are important performance factors in video signal transmission. Typical, experimentally measured temperature dependence of... more

Light-emitting diode (LED) nonlinear differential gain (DG) and differential phase (DP) were measured, since they are important performance factors in video signal transmission. Typical, experimentally measured temperature dependence of DG and DP is also presented. A linearizing method for minimizing LED DG and DP distortions, using predistortion, is proposed and experimentally examined. With this technique, and with precise adjustment of the predistortion circuits, the DG of a typical LED was improved from 12.5 percent to less than 1 percent, and the DP from 2.8° to 1°. This corresponds to an improvement in second and third-order harmonic distortions of 19 dB and 21 dB, respectively. DG and DP were measured with respect to the 3.58-MHz color subcarrier frequency superimposed on the 15.75-kHz horizontal scanning sawtooth wave. The linearization stability with regard to temperature variation was lowered to be less than 1-percent DG and 1° DP in the temperature range from 15 to 45°C.

This paper focuses on I2R losses under nonsinusoidal conditions, mainly in cables and transformers. For this purpose, a mathematical development that takes in account the presence of harmonic components in the I2R losses calculation will... more

This paper focuses on I2R losses under nonsinusoidal conditions, mainly in cables and transformers. For this purpose, a mathematical development that takes in account the presence of harmonic components in the I2R losses calculation will be presented, so that the effects of the harmonic distortion in the power system components and consequently the impact on the power factor can be analyzed. Based on this study, a factor that evaluates the power quality performance in low voltage networks is presented. This factor is directly associated to the economical viability, once that it points when the losses minimization is interesting according to the cost/benefit ratio.

This paper compares two space vector techniques that can be used to regulate the instantaneous active and reactive power flow in a Power System. The first method uses the Direct Torque Control (DTC), employed frequently on speed... more

This paper compares two space vector techniques that can be used to regulate the instantaneous active and reactive power flow in a Power System. The first method uses the Direct Torque Control (DTC), employed frequently on speed regulation of the AC machines. The second one proposed by authors, uses the optimization of the space vector voltage in a controller bridge to reduce the least square error by controlling the instantaneous active and reactive power. These control methods have several advantages and disadvantages and are combined to improve the static and dynamic Direct Power Control (DPC) performance. The new proposed control system is no affected by harmonic distortion in the network and the obtained regulation of active and reactive power flow is practically instantaneous (< 10 ìs ) as is shown by performed simulations.

Applications of digital signal processing in telecommunications are considered, taking into account the characteristics of telecommunications systems, aspects of digital transmission, digital switching, digital signal processing in... more

Applications of digital signal processing in telecommunications are considered, taking into account the characteristics of telecommunications systems, aspects of digital transmission, digital switching, digital signal processing in pulse-code modulated transmission terminals, ...

This paper presents a push-pull class-E power amplifier based on a simple load network using the impedance matched transformer. The proposed load network consists of an impedance matched transformer and series LC filter. The transformer... more

This paper presents a push-pull class-E power
amplifier based on a simple load network using the
impedance matched transformer. The proposed load
network consists of an impedance matched
transformer and series LC filter. The transformer
which is made of a ferrite core and an enamelcoated wire was used to match to the optimal load
impedance as well as to convert a balanced output
signal to a single-ended signal. The proposed power
amplifier achieved low second harmonic distortion
with push-pull structure and low third harmonic
using LC filter, which includes a shunt capacitor.
The designed and implemented power amplifier
showed an efficiency of 83.8% at an output power
of 37.4 dBm using 6.78 MHz input signal. At the
same output power level, the second and third
harmonic distortions are -43.58 dBc and -40.52
dBc, repectively.

Abstract: - Traditional wind turbines are equipped with induction generators. Induction generators are preferred because they are inexpensive, rugged, and require very little maintenance. Unfortunately, induction generators require... more

Abstract: - Traditional wind turbines are equipped with induction generators. Induction generators are preferred because they are inexpensive, rugged, and require very little maintenance. Unfortunately, induction generators require reactive power from the grid to operate and/ ...