2. DC/AC Converter Control Torque and Flux Control
Converter circuit
+ Motor
Control design
Design sliding surface for torque and flux
Lyapunov function
denote

4. Torque and Flux Control (cont.)
Calculate
where
does not depend on control
and

5. Torque and Flux Control (cont.)
Select control logic such that
Control
Logic
tends to zero

6. Torque & Flux Control (approach 2)
Cascade Control
From torque and flux equations:
where
Desired can be calculated
Sliding mode to provide desired current

7. Cascade Sliding Mode Control
Idea: Utilize extra degree of freedom
Sliding surface design

8. Lyapunov Approach
Select control logic based on Lyapunov function such that sliding mode is enforced
Advantage: simple
Control
Logic

11. Decoupling Approach to Enforce Sliding Mode
Idea: to decouple motions in
Method: non-singular transformation:
Advantage: allows frequency analysis performed for each surface individually
Control
Logic

12. Vn Control Objective: optimality by changing
Example: switching frequency reduction

13. SMPWM Simulation Results
Current tracking and vn tracking

14. Experimental Setup Controller: TMS320F2812 DSP
Switching devices: 2MBI100NC-12 IGBT
3 phase RL load
50 V DC supply

15. Experimental Results
The first waveforms show the current tracking (and ), the second ones show tracking as a sinusoidal function by the average value of (after filtering out a high frequency component of discontinuous function ).

16. Neutral Point Voltage Control