NEW ERA OF INVERTERS
ABSTRACT:-
Multilevel inverters are very useful compare to the two-level inverter because of its use of low rating devices and less EMI problem and also less dv/dt. But conventional multilevel inverters are generally avoided in industry because of its complexity. The power circuit proposed in this work is the simplest of all the existing five-level inverter but still it is capable of performing same as the others.
Asymmetrical pole voltage produces the unwanted common-mode voltage in the induction motor drive system. Common-mode voltage elimination is necessary in the induction motor drives because this alternating common mode voltage produce leakage current that will flow through the rotor and produce erosion in the rotor body and also produce motor failure. So elimination of common mode voltage is very necessary. This circuit is capable of eliminating the common-mode voltage.
A five level inverter requires four voltage sources, but here the circuit is reduced by reducing the number of the DC voltage sources. Here two DC voltage sources are used which are divided by four parts by the four DC-link capacitors, but unbalance may occur in the capacitor voltages. The controller used in this proposed method is capable of balance the DC-link capacitor voltages if unbalancing occur.
This paper presents Ability to reduce the voltage stress on each power device due to the utilization of multiple levels on the DC bus. Important when a high DC side voltage is imposed by an application (e.g. traction systems). Even at low switching frequencies, smaller distortion in the multilevel inverter AC side waveform can be achieved.
The main multilevel inverter circuit topologies are
1. Diode-clamped Multilevel Inverter
2. Imbricated Cell Multilevel Inverter
3. Modular Structured Multilevel Inverter
Asymmetrical pole voltage produces the unwanted common-mode voltage in the induction motor drive system. Common-mode voltage elimination is necessary in the induction motor drives because this alternating common mode voltage produce leakage current that will flow through the rotor and produce erosion in the rotor body and also produce motor failure. So elimination of common mode voltage is very necessary. This circuit is capable of eliminating the common-mode voltage.
A five level inverter requires four voltage sources, but here the circuit is reduced by reducing the number of the DC voltage sources. Here two DC voltage sources are used which are divided by four parts by the four DC-link capacitors, but unbalance may occur in the capacitor voltages. The controller used in this proposed method is capable of balance the DC-link capacitor voltages if unbalancing occur.
This paper presents Ability to reduce the voltage stress on each power device due to the utilization of multiple levels on the DC bus. Important when a high DC side voltage is imposed by an application (e.g. traction systems). Even at low switching frequencies, smaller distortion in the multilevel inverter AC side waveform can be achieved.
The main multilevel inverter circuit topologies are
1. Diode-clamped Multilevel Inverter
2. Imbricated Cell Multilevel Inverter
3. Modular Structured Multilevel Inverter
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