High-Power Machine Drive, Using Nonredundant 27Level Inverters and Active Front End Rectifiers (original) (raw)
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IEEE Transactions on Industrial Electronics, 2009
A nonredundant three-stage 27-level inverter using ldquoHrdquo converters is analyzed for medium- and high-power machine drive applications. The main advantage of this converter is the optimization of levels with a minimum number of semiconductors. However, the system needs six bidirectional and isolated power supplies and three more unidirectional if the machine is not using regenerative braking. In this paper, these nine power supplies are reduced to only four, all of them unidirectional, using three strategies: 1) the utilization of independent and isolated windings for each phase of the motor; 2) the utilization of independent input transformers; and 3) the most important of them, the application of special pulsewidth modulation (PWM) strategies on the 27-level converter, to keep positive average power at the medium power bridges and zero average power at the low-power bridges. The generation of this PWM and control of this multiconverter was implemented using DSP controllers, which give flexibility to the system.
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/a-review-and-harmonic-analysis-of-modified-h-bridge-multilevel-inverter-fed-indution-motor-drive https://www.ijert.org/research/a-review-and-harmonic-analysis-of-modified-h-bridge-multilevel-inverter-fed-indution-motor-drive-IJERTV1IS7243.pdf This paper presents Modified Version of Cascaded H-Bridge Multilevel Inverters as an application for high-power and/or high voltage electric motor drives. Multilevel inverters: 1) can generate near-sinusoidal voltages with only fundamental frequency switching; 2) have almost no electromagnetic interference or common-mode voltage; and 3) are suitable for large volt-ampere-rated motor drives and high voltages. In Multilevel inverters, Cascaded H bridge converters are considered as most preferred form of converters. But in these converters as the number of stair case levels in output voltage increases the dc source requirement also increases, thereby limiting its application. This paper tries to address the above problem by developing a Modified version of Cascaded H-Bridge Multilevel Converters which require less number of dc voltage source for increased levels in output voltage as compared to conventional cascaded converters. The simulation of Modified version of three phase fifteen level multilevel inverter fed induction motor drive is done by using MATLAB/SIMULINK.
2015
In this paper a new threephase multi-level inverter topology is proposed. With the increasing requirements for high power at high power quality, such a converter is inevitable. The major advantages of the proposed topology are improved power quality and lesser number of switches. This leads to lesser complexity of the control circuitry, reduction in switching harmonics and reduction in the cost. Also here the number of voltage sources required is very less compared to conventional methods. This method gives THD of output voltage about 3%. Output of the proposed three phase 31-level inverter has been verified by MATLAB simulation results. Keywords-H-bridge, Multi-level inverter, cascading, pwm technique, power quality, Total Harmonic Distortion (THD). I.INTRODUCTION Power converters are spreading technology for handling high power applications [5] in different field of growth and development of electric power utilization. They are widely being used in manufacturing, automotive tracti...
A Higher Voltage Multilevel Inverter with Reduced Number of Power Electronic Switches
Power electronic inverter become popular for various industrial drives applications. The multi-level inverter system is very promising in ac drives. Large electrical drives and utility application require advanced power electronics converter to meet the high power demands. As a result, multilevel power converter structure has been introduced as an alternative in high power and medium voltage situations. A multilevel converter not only achieves high power rating but also improves the performance of the whole system in terms of harmonics. The inverter output with more numbers of voltage levels with reduced number of switches as compared to cascade H-bridge inverter, which results in reduction of installation cost and have simplicity of control system. In this paper, a new configuration of a three-phase seven-level multilevel voltage source inverter is introduced. The proposed topology constitutes the conventional three-phase five-level bridge with three bidirectional switches. A multilevel dc link using fixed dc voltage supply and cascaded half-bridge is connected in such a way that the proposed inverter outputs the required output voltage levels. For the purpose of increasing the number of voltage levels with fewer number of power electronic components, the structure of the proposed inverter is extended and different methods to determine the magnitudes of utilized dc voltage supplies are suggested by using MAT Lab/Simulink.
Cascaded H-Bridge Multilevel Inverter For Multiphase Drive Applications
2019
A multilevel inverter has its own advantages over normal inverters for high voltage applications such as reduced harmonics, and better AC output. Multi-levels are realized by different techniques e.g. Flying capacitors, Neutral point clamp capacitor, Cascaded H-bridge, and Packed U-cell. In this paper, five-level voltage is modulated for five-phase induction motor drive. Multilevel inverters for multiphase drives has coalesced benefits of multilevel and multiphase, which makes the system an excellent solution for higher voltage applications. In this paper cascaded H-bridge inverter topology has been used for generating the five-level voltage output which is then fed to the five-phase drive and a volt/hertz control is applied for proper operation of the system. The machine is made to run at different load conditions and a satisfactory result is observed through simulation which ultimately verifies the suitability of the control and modulation. Keywords—Cascaded H bridge inverter; Mul...