DC/DC DRIVES SYSTEM WITH CLOSED LOOP CURRENT CONTROL AND CLOSD LOOP SPEED CONTROL
Final Project of Laboratory of Electric Drives M
By: OJOAWO Olatunji Julius
Submitted to: Prof. Claudio Rossi
2. PARAMETERS OF THE CONTROL SCHEME
Parameter | Value | |
Speed Controller | Ki | 1 |
Kp | 5 | |
Current Controller | Ki | 500 |
Kp | 5 | |
PWM Modulator | Carrier Frequency | 350kHz |
Load | Total Inertia (Jtot) | |
Torque Constant | 0.214Nm/A | |
Load Torque Slope (KL) | 7.219 e-5 Nms | |
Current | Saturation | [-3,3] |
Maximum Output Curret | 1.8 A | |
Electric Drive Scheme
PI Speed Regulator
PI Current Regulator
Ki = 1 Kp = 5
Ki = 500 Kp = 5
Saturation
PWM Modulator
4 Quadrat DC/DC PWM (Converter )
DC Motor
Load
PERFORMANCE:�Output current ripple at high frequency in steady state operation Ipk-pk/IOUT_nominal <10%
This is less than 10% norminal current. So, it’s satisfied
To obtain this, the carrier frequency was adjusted till it reaches the desired value. The ripples current constraint was satisfied by setting the carrier frequency to 350kHz
PERFORMANCE:
Input current ripple at high frequency in steady state operation Ipk-pk/ISOURCE_mean <1%
PERFORMANCE:�Speed range of stable operation -100% to 100% of nominal speed
PERFORMANCE:
PERFORMANCE: �Steady state speed error at 50% of nominal speed < 1%
PERFORMANCE: �Rise time to go from 0 to 50% of nominal speed: <100ms
PERFORMANCE: �Load current lower than the max output current in any operating condition
Average input and output power
Instantaneous input and output power
At 1500rpm in steady state,
P_in = 22.67
P_out = 22.45
Filter Parameters
C = 0.85µF ESR = 0.334Ω
Mosfet Characteristics