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Field Oriented Control of Multiple Induction Machines

Field Oriented Control of Multiple Induction Machines. Brian H. Green Power Affiliates Program May 12, 2006. Field Oriented Control. Uses dynamic Induction Machine equations Controls flux and torque by commanding d and q -axis currents. Multiple Induction Machines.

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Field Oriented Control of Multiple Induction Machines

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  1. Field Oriented Control of Multiple Induction Machines Brian H. Green Power Affiliates Program May 12, 2006

  2. Field Oriented Control • Uses dynamic Induction Machine equations • Controls flux and torque by commanding d and q-axis currents

  3. Multiple Induction Machines • Parallel induction machines are used in industry with applications such as locomotives • Single-inverter configurations can be more compact and less expensive than standard multiple-inverter configurations

  4. F v r1 r2 ωrm1 ωrm2 Mechanical Model

  5. Variables to Control • Control of mechanical power is equivalent to control of tractive effort at a given speed • Control of maximum flux magnitude ensures that no machine is excessively magnetized

  6. Inverter is is1 is2 is is is Motor 1 Motor 2 Electrical Model • Inverter output current is twice the average machine current

  7. Developing Current Commands • Express machine quantities in terms of average and difference quantities • Solve for average current values

  8. Average Rotor Flux Orientation • Align d-axis with average rotor flux • Implies

  9. q-axis Current Command • Solve power output equation for average q-axis stator current • Equation reduces to standard q-axis current command when difference terms are zero.

  10. d-axis Current Command • Solve rotor flux magnitude equation for ids (uses both rotor dynamic equations) • Equation reduces to standard d-axis current command when difference terms are zero

  11. Simulation

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