Poster Paper Proc. of Int. Colloquiums on Computer Electronics Electrical Mechanical and Civil 2011
Simulation of Three-level Inverter SangammaV. Gubbewad 1
Mahadevi Biradar2
Dept. of Electrical and Electronics, PDA college of Engineering , Gulbarga Email: Sangamma_spatil@yahoo.in 1 mahadevibiradar@yahoo.co.in 2 simulation of three level PWM inverter and shown output line voltage. In this present work, simulation of three phase inverter will be developed and studied about the three waveforms of three phases, IGBT is used as switching devices.
Abstract- The need for energy savings and introduction of new high power devices like IGBTs accelerate the broad use of medium and high voltage adjustable speed drives (ASD) in industrial and traction applications. To design a three-level converter-based ASD, a simulation system is developed using MATLAB package for the purpose of validating the practical power electronic circuits and offering suggestion for controller design. The various aspect of the proposed simulation system are discussed, including the Simulink modeling of the power electronic circuit, control mechanism of the simulation and the friendly graphic user interface (GUI) Some key in improving simulation efficiency are also highlighted.
III METHOD OF STUDY The power electronic circuit of the adjustable speed AC motor drive system is shown in figure1 which consists of the following parts. The input isolation transformer, which is connected to the AC transmission through the main breaker. A conventional diode rectifier in a 24-pulse series arrangement, Electronic switches (SD1 and SD2), each consisting of two protection IGBTs in series connection. They are used to disconnect the rectifier from the DC link immediately in case of inverter failures. The common mode circuit to protect the motor against common mode voltages DC-Link with the di/dt choke
I. INTRODUCTION Nowadays, energy savings have become a significant issue, which attracts a lot of interest from academic and industries. In India, especially with its power industry moving to the market mechanism, power Generation Corporation has become more and more concerned about reducing plant loads thus elevating generation efficiency, which in turn determines their competitiveness in the power market. Since the majority of plant loads are pumps and fans operated with fixed speed drive, one of the most effective method to save energy is to replace them with adjustable speed drive (ASD). The multilevel inverters have drawn tremendous interest in the power industry they present a new set of features that are well suited for use in reactive power compensation it may be easier to produce a high power, high voltage invented with the multilevel structure because of the way structure increasing the no. of voltage levels in the inverter without requiring higher ratings on individual devices can increase the power rating so the unique structure of multilevel voltage source inverters allows them to reach the voltages with low harmonics as the no. of voltage level increases the harmonic content of the output voltage waveform decreases. It is widely acknowledged that computer simulation plays a very important role in Research and Development of power electronic devices because of its high ability to speed up system implementation, and low cost. The objective of present work is to address the problem is to simulate the three phase inverter which is capable of generating sine wave output whivh can drive the three phase induction motor
Fig 1. Circuit of a three level inverter
The voltage-sourced inverter, which is based on the threelevel also as Neutral-Point Clamped (NPC) configuration. A total of 24 IGBTs are employed to build up the inverter. With short time over-voltage considered, the value may be even higher. The output LC filter, for the purpose of the supplying the motor with sinusoidal voltage.
II. LITERATURE
A. Simulation system This paper presents developed simulation system is based on the well-known MATLAB which is selected as the under lying environment because of its various unique advantages. High programming efficiency, strong numerical algorithm support convenient simulink CAD environment power
Trigg and Nayar(1) simulated single phase voltage controlled voltage source inverter and shown output waveforms using MOSFET. Shabon(2) studied and explained in detail about designing of power electronic circuits and studied simulation for single phase system. Sie et al (3) studied Š 2011 ACEEE DOI: 02.CEMC.2011.01. 537
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