Improving Power factor of an Induction motor drive using Labview
Virtual instrumentation deals with acquiring, analysing and presenting data. It offers more flexibility than traditional instruments and proves to be ideal for signal processing and simulation. It is popularly used due to its graphical nature, versatility and easy programmability. The program can be changed at any point of time according to the needs of the user.
A project which deals with the power factor determination and correction of a lagging power factor load such as Induction motor drive is discussed here. A three phase Induction motor is used as the load which normally draws lagging current. The current and voltage waveforms are obtained through current and potential transformers from the line side respectively. The sinusoidal waveform is given to zero crossing detector to produce square waveform which is then given to X-Or gate. This produces a signal which is nothing but the difference of the phase angle between current and voltage waveforms. The signal is then fed to the PC using DAQ (Data Acquisition) card. After acquiring the signal, the power factor is calculated using Lab view software and depending on whether leading or lagging, a pulse is generated. This pulse is used through DAQ card to correct the capacitance value on the line in order to improve the power factor
A project which deals with the power factor determination and correction of a lagging power factor load such as Induction motor drive is discussed here. A three phase Induction motor is used as the load which normally draws lagging current. The current and voltage waveforms are obtained through current and potential transformers from the line side respectively. The sinusoidal waveform is given to zero crossing detector to produce square waveform which is then given to X-Or gate. This produces a signal which is nothing but the difference of the phase angle between current and voltage waveforms. The signal is then fed to the PC using DAQ (Data Acquisition) card. After acquiring the signal, the power factor is calculated using Lab view software and depending on whether leading or lagging, a pulse is generated. This pulse is used through DAQ card to correct the capacitance value on the line in order to improve the power factor
