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A simple but powerful design method based on real-coded Genetic algorithms (GAs) to solve the minimization of the Total Harmonic Distortion (THD) criterion is obtained. GAs provides a much simpler approach to off-line tuning of Pulse width Modulation (PWM) switching angles than the rather complicated non-genetic optimization algorithms. Genetic algorithms are exploratory search and optimization procedures...
Dynamic Voltage Restorer (DVR) restores the distribution system load voltage to a nominal balanced sinusoidal voltage, when the source voltage has distortions, sag/swell and unbalances. DVR has to inject required amount of Volt-Amperes (VA) into the system in order to maintain a nominal balanced sinusoidal voltage at the load. A new control technique is applied to compensate the sag and harmonics...
This paper presents and compares the performance of two controllers namely Fuzzy Logic and Proportional Integral applied to a voltage source inverter/converter operating as an active power filter. The active power filter is operated to compensate harmonics and reactive power generated by the non-linear load and power factor correction simultaneously. This work is performed in order to make an accurate...
In this paper, a new scheme for three-level voltage space vector generation is proposed. In this work, the three-level inverter topology is realized by feeding an open winding induction motor with two two-level inverters, fed from a single dc source having the magnitude half compared to the NPC three-level inverter. Compared to existing three-level inverter topologies for open-end winding induction...
This paper proposes a digital implement method of selective harmonic elimination pulse width modulation (SHEPWM) based on digital signal processor (DSP). First, the switching angles for eliminating selective harmonics are calculated with computer-aided software, and functional relationships between modulation indexes and switching angles are obtained. The curve fitting technique is then used to fit...
The multilevel inverter utilization have been increased since the last decade. These new type of inverters are suitable in various high voltage & high power application due to their ability to synthesize waveforms with better harmonic spectrum and faithful output. This paper presents, two proposed scheme adopting the multicarrier pulse width modulation concept. The multicarrier pulse width modulation...
This paper proposes a new space vector PWM technique for four-switch three-phase inverters (FSTPI) under DC-link voltage ripple condition with the optimization of the amplitude of first harmonic output voltage. The proposed algorithm is based on the establishment of quasi-space-vectors with their maximum length and modulation technique, which is simulated the technique for six-switch three-phase inverters...
This paper describes a single pole, single throw (SPST) 180 nm CMOS thin film SOI switch developed for the most difficult cellular and 802.11x RF switch applications. We will show that power handling, linearity, insertion loss, isolation and switching times are competitive with switch applications utilizing GaAs pHEMT and silicon- on-sapphire technologies.
This paper presents a control algorithm for improving the performance of a three-phase, four-wired (3P4W) active power filter (APF) under unbalanced and distorted supply voltages. A low pass filter (LPF) is designed to filter the nonsinusoidal supply voltages. The minimal optimal values of active power filter source reference currents are estimated in natural a-b-c reference frame. The proposed method...
Silicon-on-insulator technology utilizing very high resistivity handle wafers demonstrates sufficient performance for many cellular handset requirements. Technologies with either thin or thick device layers show promise. Thick-SOI prototype single pole six throw switch (SP6T) P-0.1dB of about 40 dBm and -75 dBc harmonic at 35 dBm output have been demonstrated at 900 MHz. Thin-SOI Ron-Coff product...
In this contribution, the analysis on high frequency class E design approach is presented. Starting from the classical theory, a numerical analysis is performed to extend class E feasibility at higher frequencies. The design of hybrid class-E amplifier in LDMOS technology for UMTS base-station applications will be presented, in order to validate the theoretical results. The simulated PA reaches an...
With the increasing of the wind turbine capacity, inverter paralleling is one of the best approaches for MW-level wind power converter system design. This paper presents a new control algorithm for paralleling inverters based on SVPWM, which can reduce the output harmonic currents and inhibit the circulating current between the inverters. The detailed algorithm principles and mathematic derivations...
Through analyzing the typical systempsilas characteristic and Ultra-High Voltage(UHV) ac transmission linepsilas characteristic, the strategy by controllable shunt reactor is presented to improve transmission quality in electric networks in this paper. By using MATLAB PSB, simulation model of UHV ac transmission line from Jindongnan to Jingmen was built to study control effects on frequency over voltage,...
In a three-phase PWM voltage-source inverter, there have voltage losses that cannot be neglected between the reference voltage and the actual output voltage due to the dead time effect. The distortion of voltage leads to serious problems such as current waveform distortion and torque oscillation of motor driving systems. In this paper, an improved method which effective reduces the losses of voltage...
This paper deals with topologies of circuits and strategies of modulation for multilevel inverters. There is a close relationship between these two factors. A new Hybrid multilevel inverter based on the features of the NPC inverter and the Cascade inverter is recommended. Its three modulation strategies and voltages spectrum characteristics are analyzed. The spectrum expressions of the continuous...
A high performance modular three-phase utility-interactive converter is designed and implemented in this paper. This converter has three operation modes: grid-connection inverter mode, stand-alone inverter mode and rectifier mode. Control principles and modes of every mode are analyzed in detail and the modular design method is adopted. A simple but valid control strategy is proposed. Finally a 10...
PWM technology has been widely used in motor drive systems today. To avoid the short-circuit condition, dead-time must be inserted to the PWM driving pulses. The addition of dead-time increases the harmonic of output voltage, makes the waveform of winding current more badly. The ripple of motor torque and speed is also increased by the addition of dead-time. The influence of dead-time is more remarkable...
The multiple overlap mode of the overlap carrier wave phase shift PWM (SVPWM) inverter is one of the development directions of the super-high capacity inverter, this paper reasons the relation between carrier wave phase shift SVPWM circuit output voltage and phase shift angle, put forward the best phase shift angle formula, proposed two kinds of control schemes and compares them. Through the experiment...
This paper presents a novel method to suppress neutral harmonic currents in three-phase four-wire power systems. The significant advantages include low cost, high reliability, good effectiveness, free of LC resonance and flexible installation location. Furthermore, under unbalanced loading, only harmonics in the neutral current are suppressed while the fundamental currents are not affected. In the...
This paper present a high power three-level NPC inverter with the Integrated Gate-Commutated Thyristor (IGCT) devices. The power circuit consisted of a 12-pulse diodes rectifier and three-level NPC inverter with IGCT. A valid SVPWM control strategy filled with a TMS320F2407 DSP controller is proposed to improve power quality, reduce total harmonic distortion and overcome the problem of the minimum...
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