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

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

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

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

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

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

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

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

SMPWM Simulation Results Current tracking and vn tracking

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

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 ).

Neutral Point Voltage Control