Performance Analysis of Cascade H-Bridge Multilevel Inverter Topology With Filter Circuit and Without Filter Circuit

Performance Analysis of Cascade H-Bridge Multilevel Inverter Topology With Filter Circuit and Without Filter Circuit

Nikhil Agrawal (Ujjain Engineering College, India)
DOI: 10.4018/978-1-5225-9683-7.ch008
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Multilevel inverter is a modified version of inverter. Multilevel inverter recently emerged in the area of high power and medium voltage application. In the last few decades, the great innovation has been done to improve the inverter performance, and it is challenging even today. The multilevel inverter performance is examined by total harmonic distortion and component required. In multilevel, as level increases, the total harmonic distortion value decreases, but the number of components required and driver circuit increases that make the circuit more complex and also the effect on cost. So, the challenge is to balance the bridge between cost and total harmonic distortion. This chapter simulates the various levels of conventional cascade H-bridge inverter and new proposed topology of multilevel inverter with using different modulation techniques and with using filter circuit and without filter circuit.
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Multilevel Inverter

The multi-level inverter has invented in 1970-1980s (Baker, 1980). The basic concept of multi-level inverter is to obtain high power and voltage by using a power semiconductor switches. Multilevel inverter produce staircase voltage waveform. To eliminate the harmonics many scheme adopted such as multicarrier modulation techniques and filter circuit. The modulation techniques compared reference wave i.e. sinusoidal wave (fundamental frequency wave) with carrier wave (higher frequency triangular wave) and output pulse is intersection of these signals and it is responsible for switching ON or switching OFF the inverter switching device.

The several advantage over a two- level inverter. The brief introduction of these advantages as follows (Ebrahimi, Babaei and Gharehpetion, 2012; Colak, Kabalci, Bayindir, et al., 2011).

  • Output Waveform Quality: Multilevel inverter provides less distorted waveform and that reduced the 978-1-5225-9683-7.ch008.m01 stress.

  • Common Mode Voltage: High common mode voltage is responsible for failure of motor bearings that is connected to multilevel inverter drive circuit. The multilevel inverter produce the low common mode voltage.

  • Less Total Harmonic Distortion: Multilevel inverter produces low value of harmonics in output waveform.

  • Switching Frequency: Multilevel inverter have a switching device that will operate at low switching frequency as low switching frequency that means low switching loss so that efficiency is high in case of multilevel inverter.

Multilevel inverter also have some disadvantages compare to two level inverter.

  • Large number of Switching Devices: As level increases to lowered the THD factor in output voltage waveform the number of power semiconductor switch and their driver circuit require more that will circuit become complex, bulky, difficulty in packaging and also effects on cost.

  • Chances of System Failure: Due to complexity of circuit, there are more chances of system failure.

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