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CHAPTER4 MODEL OF THREE-PHASE INVERTER

CHAPTER4 MODEL OF THREE-PHASE INVERTER Introduction In this chapter the THREE-PHASE INVERTER and its functional operation are discussed. In order to realize the THREE-PHASE output from a circuit employing dc as the input voltage a THREE-PHASE INVERTER has to be used. The INVERTER is build of switching devices, thus the way in which the switching takes place in the INVERTER gives the required output. In this chapter the concept of switching function and the associated switching matrix is explained. Lastly the alternatives as to how the INVERTER topologies can be formed is presented. Switching Functions It is well-known that some switching devices exist between the source and the load, the number of which depends on the circuit or the type of the load.

various pulse width modulation (PWM) strategies. The standard three-phase inverter shown in Figure 4.5 has six switches the switching of which depends on the modulation scheme. The input dc is usually obtained from a single-phase or three phase utility power supply through a diode-bridge rectifier and LC or C filter. 66 + + +

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  Phases, Bridge, Single, Rectifier, Bridge rectifier

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