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The flexible ac-transmission system (FACTS) family called distributed power flow controller (DPFC). The DPFC is derived from the unified power flow controller (UPFC) with eliminated common dc link. The active power exchange between the shunt and series converters, which is through the common dc link in the UPFC, is now through the transmission lines at the third-harmonic frequency. The DPFC is to...
This paper presents a novel idea to show the ability to benefit of the harmonic currents which are produced on the load side of the power grid. The proposed circuit contributes in reduction of the Total Harmonic Distortion (THD) percentage through adding a High Pass Filter (HPF) in order to draw harmonic currents (in 150 Hz and multiple frequencies) and convert them to Direct Current (DC) (zero frequency)...
In this paper, designs of an effective third harmonic generator using a left-handed nonlinear transmission line (LH NLTL) are presented. The proposed harmonic generator using the LH NLTL is composed of a series of varactor diodes and shunt inductances implemented on microstrip-line (MSL) and suspended stripline (SSL). Both of the harmonic generators were built on a Rogers RO4003 substrate and has...
In this paper, designs of an effective third harmonic generator using a left-handed nonlinear transmission line (LH NLTL) are presented. The proposed harmonic generator using the LH NLTL is composed of a series of varactor diodes and shunt inductances implemented on microstrip-line (MSL) and suspended stripline (SSL). Both of the harmonic generators were built on a Rogers RO4003 substrate and has...
In the field of motion control systems, voltage ripple, harmonics, and electromagnetic interferences (EMI) in an output of converters negatively affect the control performance. However, so far, there has been practically few works that explicitly consider the power converters in motion control systems. Currently, general 2-level converters are widely used. However, it is concerned that the 2-level...
Resonant interactions of grid-connected converters with each other and with cable capacitance are challenging the stability and power quality of renewable energy sources based power plants. This paper addresses the instability of current control of converters with the multiple resonance frequencies consisting in LCL filters and cables. Both grid and converter current controls are analyzed. The frequency...
For recent energy-saving computer power converter products, it's required to provide a very tightly regulated voltage under very stringent current load change conditions. In this paper, this issue is dealt with for a current-mode constant on-time buck converter. An issue about beat frequency effects analysis is first given using modulation spectrum theory and small-signal frequency-domain model. This...
Cascaded H-Bridge converters are an attractive topology for automotive applications due to the potential improvements in motor efficiency and the system modularity they offer. Isolated voltage sources are required in this structure and one approach to providing these is use of the Dual Active Bridge converter. Regardless of the number of phases in the load, each element in the cascade supplies a single...
With large amount of power electronic devices applied in distributed generations or micro-grid, harmonics pollution is becoming a more and more serious problem which limits their widely application. Frequency dividing droop controller is proposed to eliminate voltage harmonics, according droop control theory. But it failed to give an expected index to represent its harmonic suppression ability. In...
This paper presents development and construction of an integrated dual inputs down-converter in the 18–40 GHz frequency range with noise figure better than 13 dB, average conversion gain of 20 dB and phase noise of better than −96 dBc/Hz at 10 kHz offset. This configuration provides the highest gain with third order intercept point of 10 dBm. This module consists of two channels: 18–30 GHz and 26–40...
Lithium niobate is a ferroelectric material widely used in nonlinear and integrated optics due to its transparency over a large wavelength range and its high optical nonlinearity. However, since the conversion efficiency of nonlinear processes is usually very weak, further enhancement mechanisms are required. Here we demonstrate the enhancement of second harmonic generation in self-suspended lithium...
For submillimeter-wave frequency generation we present active six-fold frequency multiplier monolithic integrated circuits. Without post-amplifier stage, an output power of −15 dBm in the frequency range from 507 to 672 GHz is reached. A second S-MMIC with an integrated output buffer amplifier achieves a maximum output power of −8 dBm at 557 GHz and a 3-dB output frequency range from 552 to 618 GHz...
The purpose of this paper is to analyze the harmonic current distortion in a system with air conditioners driven by frequency converters and its correction waveform current with the use of two filters tuned in different frequencies. The use of air conditioners inverter, despite lower power consumption, the circuit injects harmonic frequencies of multiple orders that pollute the system. The filters...
The paper presents results of experimental measurements of efficiency of variable speed drive assemblies and their analyses. These configurations of the drive have been tested: without any filtering devices, with an input AC reactor and broadband passive harmonic filters, and with output filtering, such as output reactor or sine-wave filter, respectively. These filtering devices are used to match...
Various technical solutions are used to reduce harmonics generated by variable speed drives (VSD). AC VSD belong to their very significant sources with negative influences on the quality of electrical energy at the point of their connection to the network. The paper presents measured results of two types of broadband passive harmonic filters energized from a it programmable three-phase power source...
The use of frequency converters in induction motor drive centrifugal pumps allows controlling the flow discharge systems provided by pumping through the rotation of the pump. The method of controlling the flow through the pump rotation, in terms of energy efficiency is much more effective in the reduction of electric power consumption and active power demand of the control method done by adjusting...
Non-linear behavior of power semiconductor switch and non-linear load creates power quality problem in an ac to ac converter. These non-linear switches and load injects significant harmonic on Load side as well as on source side. In this paper an attempt has been made to reduce these harmonics using staircase PWM technique and passive filter. For load side harmonic mitigation, staircase PWM technique...
Recently, within the family of FACTS, the distributed power flow controller is an additional device. This paper highlights on voltage sag mitigation which is one of the burgeoning power quality issues. It deals with the working concept of distributed power flow controller for compensating unbalanced three phase line currents in the transmission system. The single phase series converters of DPFC are...
This paper presents a low power divide-by-three injection locked frequency divider (ILFD) for the V-band implemented in 65nm CMOS technology. The divider achieves a locking range of 5.5% by using the proposed harmonic-boosting technique. The 71GHz to 75GHz locking range was measured with a maximum input power of 0dBm. The inherent MOSFET non-linearity was exploited to generate the odd-order division...
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