DC/AC Converter Control Torque and Flux Control

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DC/AC Converter ControlTorque and Flux Control

• Converter circuit
• Motor
• Control design
• Design sliding surface for torque and flux
• Lyapunov function

denote
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Torque and Flux Control (cont.)

• Calculate

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

• Select control logic such that

Control Logic
tends to zero
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Torque Flux Control (approach 2)

• Cascade Control
• From torque and flux equations
• where
• Desired can be calculated
• Sliding mode to provide desired current

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Cascade Sliding Mode Control

• Idea Utilize extra degree of freedom
• Sliding surface design

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Lyapunov Approach

• Select control logic based on Lyapunov function
  such that sliding mode is enforced
• Advantage simple

Control Logic
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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
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Vn Control

• Objective optimality by changing
• Example switching frequency reduction

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SMPWM Simulation Results

• Current tracking and vn tracking

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Experimental Setup

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

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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 ).

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Neutral Point Voltage Control
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