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DUTY CYCLE: OBJECTIVE: To explain why the power electronics circuits are efficient and the losses occur in the power electronic circuit. Using a suitable Matlab model show how duty cycle control signal can be generated for a simple power converter circuit. To Make a comparison of square wave inverter output voltage…
Ramganesh Jothirenganathan
updated on 02 Dec 2020
DUTY CYCLE:
OBJECTIVE:
1)POWER ELECTRONICS:
POWER MODULES/SWITCHES:
EFFICIENCY:
LOSSES IN POWER ELECTRONICS CIRCUIT:
There are two main losses in the power dissipation of the circuits,
SWITCHING LOSS:
CONDUCTION LOSS:
2)Duty cycle control signal:
The Buck converter model in Matlab is used to simulate the nature of the duty cycle control signal.
d=Vout/Vin
where d is the duty cycle.
The parameters for the duty cycle as follows:
CASE-1:
d=0.3:
In the constant block, the input is given as 0.3 and the output voltage is viewed through the scope block.
CASE-2:
d=0.5:
In the constant block, the input is changed to 0.5 and the output voltage is viewed through the scope block.
CASE-3:
d=0.7:
In the constant block, the input is changed to 0.7 and the output voltage is viewed through the scope block.
RESULT:
3)Comparison of square wave inverter output voltage with sine modulated one.
ADVANTAGES:
4)Difference between VFD and Vector control drive:
Variable Frequency Drive(VFD) | Vector Control Drive |
Variable Frequency Drive(VFD) control method work by optimizing the motor flux and keeping the strength of the magnetic field constant, which ensures constant torque generation. | Vector control drive controls the speed or torque of an AC motor by controlling the stator current space vectors, similar to the DC control methods by transforming a three-phase system that depends on time and speed to a two-coordinate time-invariant system |
VFD control method varies both the voltage and frequency of power to the motor in order to maintain a fixed, constant ratio between the two, so the strength of the magnetic field is constant, regardless of motor speed. Here flux and current cannot be controlled independently. |
The stator current in an AC motor consisting of the magnetising component of the current and the torque producing component is controlled independently each with its own PI controller. |
VFD control is typically implemented without feedback. | Vector control method uses sensors to get feedback for dynamic control. |
Instantaneous torque control cannot be achieved by this method. | Due to the dynamic response, instantaneous torque control can be achieved. |
VFD method for induction motor in EV application:
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