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Select the correct statement.
1. For current source inverters, the amplitude and phase angle of the motor voltage depends on the load conditions of the motor.
2. Resonant link inverters are mostly removed because they are responsible for switching losses in power devices.
3. DC-to-AC converters usually have a 2-phase bridge.
4. VSI cannot be controlled in PWM also.

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Correct Answer - Option 1 : For current source inverters, the amplitude and phase angle of the motor voltage depends on the load conditions of the motor.

Current source inverter:

  • In current source inverter, the input current remains constant, but this input current is adjustable.
  • The current source inverter is also called the current fed inverter.
  • The output voltage of the inverter is independent of the load.
  • The magnitude and phase angle of the load (motor) current depend on the nature of load impedance or load condition of the motor.
  • It is most suitable for supplying power to capacitive loads.
  • In order that the current input to the CSI must remain ripple free and constant, L-filter is used before the CSI (in series with the energy source).

 

Advantages:

  • The circuit for CSI is simple as it uses only converter grade thyristor which should have reverse blocking capability, and also able to withstand high voltage spikes during commutation.
  • An output short circuit or simultaneous conduction in an inverter arm is controlled by the ‘controlled current source’ used here, i.e., a current limited voltage source in series with a large inductance.
  • The commutation failure in the same leg does not occur due to the presence of a large inductance and has the capability to recover from occasional commutation failure.
  • The converter-inverter combined configuration has inherent four-quadrant operation capability without any extra power component.

 

Disadvantages:

  • A minimum load at the output is required, and the commutation capability is dependent upon load current. This limits the operating frequency, and also puts a limitation on its use for UPS systems.
  • At light loads, and high frequency, these inverters have sluggish performance and stability problems

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