International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017
p-ISSN: 2395-0072
www.irjet.net
A NOVEL FOUR WIRE INVERTER SYSTEM USING SVPWM TECHNIQUE FOR UPS APPLICATIONS Vidhya.M1, Mohanapriya.V2 1Assistant
Professor, Dept of EEE, Bannari Amman Institute of Technology, Tamilnadu, India
2Assistant
Professor, Dept of EEE, Bannari Amman Institute of Technology, Tamilnadu, India.
---------------------------------------------------------------------***--------------------------------------------------------------------voltage. The dc power input to the inverter may be improvement of the power converters in Uninterruptible battery, fuel cell, solar cell or other source. But in Power Supply (UPS) based on size reduction, efficiency most industrial applications it is fed by a rectifier.
Abstract - This paper proposes the performance
improvement and power quality. The traditional UPS consists of step up transformer or dc-dc chopper to boost the voltage which decreases the efficiency, reduces the power quality and leads to increase the cost of energy conversion. Many PWM techniques are available for inverter switching. This paper introduces the concept of space vector modulation for four wire voltage source inverters. The Space vector modulation scheme generates the inverter leg switching time from the sampled reference phase voltage amplitudes. It involves sector identification and lookup tables. The four wire inverters are used in many applications to handle the neutral current caused by the unbalanced and non-linear load. The Space Vector Modulation (SVM) for four wire voltage source inverter is simulated using MATLAB/SIMULINK model for two level output voltages. Further the results are analyzed for various loading conditions for two level output voltage waveform.
Key Words: Inverter, Space Vector Modulation, THD 1. INTRODUCTION The space vector modulation (SVM) method is an advanced, computation intensive PWM method and is possibly the best among all the PWM techniques. Because of its superior performance characteristics, it has been finding wide spread application in recent years. A power electronic inverter is essentially a device for creating a variable ac frequency output from a DC input [1]. The output frequency of an inverter is determined by the rate at which the semiconductor devices are switched on and off by the inverter control circuitry and consequently, an adjustable frequency ac output is readily provided. It is possible to control the output voltage as well as optimize the harmonics by performing multiple switching within the inverter with constant dc input Š 2017, IRJET
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A voltage fed inverter (VFD) or Voltage source inverter (VSI), is one in which has stiff dc voltage source at its input terminals. In many industrial applications, it is often required to control the output voltage of the inverter to cope up with the variations of the DC input voltage, for voltage regulation of the inverters and for the constant volt /frequency control requirements [2]. In spite of the complexity involved in the SVM (many output vectors) compared to carrier-based, it remains the preferred one due to the reduced power losses by minimizing the power electronic devices switching frequency. This paper presents the state-of-the-art of SVM technique and computer simulation works of SVM scheme in four wire voltage source inverter. It also compares the results of the two level in terms of Total harmonic distortion (THD) and loading conditions. 2. FOUR WIRE VOLTAGE SOURCE INVERTER Four wire inverter is a way of providing a neutral connection for three phase four wire unbalanced systems using a four leg inverter topology by tying the neutral point to the midpoint of the fourth neutral leg. Four leg inverter is utilized in high power UPS for its advantage of feeding unbalanced load and the higher dc voltage utilization. Conventional three phase three wire inverters are suitable for supplying three phase balanced loads. For unbalanced three phase loads these four wire inverters able to provide a path for the neutral current, flexibility to control the
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