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Modular Multilevel Converter is a widely accepted technology for HVDC applications. It consists of several sub-modules or cells connected in cascade. These are bidirectional chopper cells and each one of them has a floating capacitor. This paper discusses the modulation and voltage balancing strategies which are essential for the converter to work as rectifier or inverter. The discussion is followed...
Modular Multilevel Converter is a widely accepted technology for HVDC applications. It consists of several sub-modules or cells connected in cascade. These are bidirectional chopper cells and each one of them has a floating capacitor. This paper discusses the modulation and voltage balancing strategies which are essential for the converter to work as rectifier or inverter. The discussion is followed...
Solid state transformer (SST) is a power transformer which led to the reduction in the physical profile of a transformer with power electronic devices on both the sides of the transformer supplemented with the ancillary services provided by the introduction of power electronic devices into the system. In this work, a two-stage topology is introduced which provides low voltage DC (LVDC) port, or medium...
This paper proposes, a single phase direct matrix converter using Insulated gate bipolar transistors, where undesired harmonics are minimized using three modulation techniques, namely: Sinusoidal Pulse Width Modulation, Delta Modulation and Adaptive Delta Modulation (ADM). This converter not only works as a Cyclo-Inverter (CI) but also as a Cyclo-Converter (CC). For these modulation techniques, a...
This paper presents an anti-islanding protection scheme for a grid tied inverter. In this scheme, the oscillation variation in frequency is estimated by Estimation of Signal Parameters via Rotational Invariant Technique (ESPRIT). The proposed system is implemented in MATLAB and real time in OPAL-RT. Series of simulation results demonstrate that non-detection zone of proposed algorithm is negligible,...
The laboratory prototype of a frequency converter (FC) is analyzed using readily available Spartan-3E Field Programmable Gate Array (FPGA) kit and Personnel Computer (PC). The output frequency range has been varied over a wide range by implementing Sinusoidal pulse width modulation (SPWM) technique, in order to minimize the harmonics, using very high speed integrated circuit hardware descriptive language...
The art and science of lithography has come a long way supporting the semiconductor manufacturing. In this paper the recent trend in semiconductor lithography has been reviewed along with the discussion of present day technological challenges and various efforts that are being made to stretch the knowhow for manufacturing next advanced node. The layout features undergo transformation through the manufacturing...
The design and the manufacturing of VLSI devices traditionally have been isolated affairs with different teams working on each aspect. The communication between electrical designers and process engineers has been through the form of rule files and model files. After design signoff and mask delivery the responsibility of process engineers in the fabrication line is to ensure the yield. In the absence...
Wind power plant is source of harmonics and inter-harmonics. Estimation of these harmonics is very important and crucial task in modern distribution generation environment. This paper presents sliding window matrix pencil algorithm to estimate harmonics and inter harmonics produced by doubly fed induction generator based wind power plant. The series of simulation results under variable wind speed...
Advanced Metering Infrastructure (AMI) is the basic building block for development of Smart Grid in Distribution System. The main purpose of AMI is to enable two way communication between consumer and Smart Grid Control Center of Utility which involves remote monitoring & control of energy consumption as well as other parameters in real time. Meter data analytics play a vital role in AMI system...
In this review paper we have tried to understand various existing transistor models defined, used and understood by various industry simulators viz., Spectre, LTSpice, PSPICE and HSpice. Comparative studies of industry standard spice simulators have also been done viz PSPICE, Spectre and HSpice. Towards the end numerical analysis method has been described to give an overview of the numerical methods...
Detection of harmonics and inter-harmonics produced by wind power plant is very challenging task for the modern power system researchers. This paper presents estimation of harmonics produced by wind generator under variable wind speed by sliding window ESPRIT and sliding window Root-MUSIC algorithm. The series of simulation results demonstrate advantages of the sliding window ESPRIT over the sliding...
A direct single stage single-phase to three-phase conversion has been realized using a cycloinverter (CI) capable of generating high frequency output voltage required by high speed motors, eliminating the requirement of dc link capacitor in two stage conversion. A three phase induction motor drive is run using single phase to thee phase cycloinverter. Space vector PWM controller has been developed...
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...
A cycloinverter has been analyzed using two modulation techniques namely delta modulation (DM) and trapezoidal modulation (TM). Field Programmable Gate Array based digital controller has been developed to generate the trigger pulses for cycloinverter using Hardware Description Language. Lowest THD has been found to 2.5% for DM and 5% for TM when modulation index m = 1. There is no specific pattern...
This paper presents the control of elevator system using Siemens LOGO PLC. The system is programmed to drive a dc motor for forward and backward motoring mode with sensors at each floor, emergency STOP switch for maintenance purpose or to prevent any accident inside the lift & door switch for safety purpose. The system is also programmed to conserve energy by automatically switch off lights and...
Fibonacci Search Algorithm is designed to calculate the intersection points of cosine wave and reference wave in cosine-wave crossing method for single phase matrix converter. The reduced number of comparisons as compared with linear search method may be used in control circuits for converter to provide faster response.
This paper proposes the implementation of staircase modulation technique to a single phase matrix converter for reducing the harmonic distortions in the output. The matrix converter is used as cyclo-inverter as well cyclo-converter. Simulation results are shown for the converter using MATLAB/SIMULINK software. Various parameters including output frequency of the converter, carrier frequency of the...
A single phase matrix converter has been used as a Generalized single phase Power electronics converter such as Rectifier, Chopper, Inverter, AC voltage controller and Frequency changer using a single topology. An algorithm is developed that provides flexibility to single phase matrix converter (SPMC) to perform function of above various converters. Sinusoidal pulse width modulation (SPWM), multiple...
SiC Power MOSFETs show a tremendous potential for high voltage, high temperature, high-power and high-frequency power electronic applications. A simplified SPICE model is proposed for the SiC Power MOSFET, CMF20120D, based on the understanding of the power MOSFET discrete devices terminal behavior. The aim of the model development is to reuse the available built-in MOSFET models of the regular lateral...
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