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Various topologies of multilevel inverters have been proposed as a potential replacement for cascaded multilevel inverters in high-voltage, high-power applications as they can be extended to any number of voltage levels without introducing much more complexity to the control system. This paper discussed in detail about the application of selective harmonic elimination pulse-width modulation (SHE-PWM)...
An increasing number of electrical motors are driven from frequency inverters. The losses in motor are increased because the produced nonsinusoidal stator voltages, supplied from IGBTs, contain significant harmonic components. Different PWM Methods cause different voltage harmonics. Depending on the control method, the motor characteristics and the partial load, the efficiency of the motor inverter...
Multicarrier pulse width modulation (MC-PWM) techniques such as Level-shifted PWM (LS-PWM) and Phase-shifted PWM (PS-PWM) are the popular methods to control the output voltage of Multilevel Inverters (MLIs). The advantage of LS-PWM techniques over PS-PWMs is that they produce better harmonic profile, but the un-equal power distribution problem of LS-PWMs imposes limitation to their usage in high power...
This paper represents the Hardware implementation of three phase three level inverter based DSTATCOM to reduce the THD. Inverter based DSTATCOM system using mc3phac IC. In this project mc3phac IC is used to generate PWM pulses with alternate phases these PWM signals are used to fire the IGBT. The system consists of mc3phac IC, IR2110 IC (IGBT drive IC), two voltage regulators (LM7805, LM7812). In...
Pulsewidth modulation (PWM) variable speed drives are increasingly applied in many industrial applications that require superior performance. The carrier-based PWM strategy can be improved by adding different zero sequence signals to the reference sinusoidal phase voltages. This paper presents a comparative evaluation of five carrier-based PWM techniques with zero-sequence signal injection for a six-switch...
This paper presents a power-hardware-in-the-loop (PHiL) grid emulator (GE) which is based on switch-mode voltage source inverters (VSI) with the magnetic coupling. The grid emulator is controlled to reproduce the typical grid fault behaviors (under-voltage, interruption, frequency variation, fault-ride-through etc.) for the equipment under test (EUT). In past several different commercial grid emulators...
Battery energy storage systems (BESS) are expected to increase in the number and capacity because of the increasing share of intermittent renewable energy resources in the electrical grid. Due to the cost and nature of the BESS, they are well suited for the primary reserve to balance load fluctuations in the grid. Power-electronic converters are employed for the power exchange between the transmission...
A holistic approach to determine the optimum number of phases m of an m-phase motor in combination with an m-leg inverter for electric vehicle applications is presented. The optimum offers a significant improvement of the torque and power by approximately 9.6% over the whole operating range in comparison to a 3-phase motor and therefore enhances the power and torque density without expanding the design...
The aim of this paper is to bring new contribution and new technology for locomotive especially for WAP-7. Recent advance technology was proposed on locomotive by ABB, ALSTOM, HITACHI, etc. but still there is a disturbance in converters by converting AC/DC/AC. This proposed topology called multilevel inverter using PIC reduces the total harmonic distortion and also while triggering the gates in inverter...
Battery energy storage system(BESS) connected to the grid by power conversion system(PCS). Currently Cascaded Multilevel Converter(CMC) and Modular Multilevel Converter (MMC) are two more advanced topologies for PCS. This paper compares CMC and MMC topologies in aspects of efficiency, harmonic characteristics, reliability, control system complexity and cost, the simulation results are presented. Suggestions...
Multilevel inverters generate a level output voltage from DC voltage sources. Requiring nice range of semiconductor switches is main disadvantage of structure inverters. The structure inverters are divided in 2 groups: symmetric and Asymmetric converters. The Asymmetric structure inverters give an oversized range of output steps while not increasing the quantity of DC voltage sources and elements...
Current energy paradigm of mixed renewables seems to urgently require reactive power provision at various feed-in points of the utility grid. Photovoltaic (PV) inverters are able to provide reactive power in a decentralized manner at the grid-connection point even outside active power feed-in operation, especially at night. This serves as a motivation for utilizing the PV inverters at night for reactive...
Due to the increase in load and use of heavy machines in the industries, the demand for multilevel inverter has been increased to a large extent. This paper investigates the effect of increase in Levels from 3 to 33 levels, using a simplified technique in Separate Source Cascaded Multilevel Inverter (CMlI) on the Total Harmonic Distortion (THD) for 1-Phase and 3-Phase Inverter without using any filters,...
This paper presents two machine drive system based on a six-phase machine (SPM) and three-leg converters. The machine is composed of two three-phase groups. For the first configuration, one of the groups is connected to a three-leg converter and the other is connected to other two three-leg converters in an open-end winding configuration (see Fig. 4). For the second configuration, one of the groups...
The design of optimized modulation schemes at low pulse ratios, e.g. Selective Harmonic Elimination (SHE), has been widely studied. However, most previous work has focused on half-wave symmetry pulse patterns. For variable speed and variable torque applications, non-half-wave symmetry SHE modulators depending on the power factor angle still achieve highly efficient inverters in many power factors...
Cascaded multilevel inverter is a superior option for static var compensators and active power filters, especially in high voltage and/or high power applications due to its modular structure and distributed voltage stress and switching losses among switching devices. The influence of semiconductor device on-state voltage drops on the harmonic current and reactive power compensation in a cascaded multilevel...
Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. Multicarrier pulse-width-modulation (PWM) strategies for cascaded H-bridge (CHB) inverter are used to identify phase-shifted PWM (PSPWM) that produces almost same THD as produced by carrier disposition PWM or level-shifted PWM (LSPWM), but PSPWM has the effect...
This concept represents an AC-to-AC conversion for voltage and current control scheme with instantaneous reactive power minimization also reduce the harmonics for high power applications in a distorted AC power supply. The strategy uses the commutation state of the converter in the subsequent sampling time according to an optimization algorithm given by a simple cost function and the discrete system...
This paper presents a pure sine wave inverter (SWI) for photovoltaic (PV) applications. In contrast to the sinusoidal pulse width modulation (SPWM), which is commonly used for switching the SWI and has several drawbacks such as low fundamental output voltage, this paper presents an advanced modulation technique called harmonic injection modulation (HIM) to build a pure sine wave inverter. The proposed...
A hybrid asymmetric 2-cell 9-level inverter is analysed and compared with two conventional multilevel inverters: the 9-level cascaded H-bridge and the 3-level diode clamped inverter, when used to drive an induction motor of 4.16kV/500kVA. In this analysis, Total Harmonic Distortion (THD), First Order Distortion Factor (DF1), power semiconductor losses, and efficiency are selected as performance indexes...
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