Predictive Control of Power Converters and Electrical Drives

8.3 Field Oriented Control of an Induction Machine Fed by a Matrix Converter Using Predictive Current Control

When the induction machine is fed by a matrix converter, the same predictive control strategy presented in Chapter 7 for this converter can be used as part of a FOC scheme. However, specific requirements for the matrix converter can be included in the cost function.

8.3.1 Control Scheme

The control strategy for the matrix converter counts with an inner control loop that performs predictive current control, and an outer loop that handles speed, flux, and torque control by means of FOC [19], which generates reference currents for the predictive current control. A block diagram of the entire control strategy is presented in Figure 8.2.

Figure 8.2 FOC of an induction machine fed by a matrix converter using predictive current control

A PI controller receives the speed error and generates the reference torque. The reference amplitude of the stator flux and reference torque are used, by means of FOC, to generate the output reference current to the predictive current control segment of the control strategy, as shown in Figure 8.2. The predictive current control strategy replaces, in this approach, linear current controllers and the modulation techniques of classic methods [20, 21]. The predictive algorithm handles the objectives of controlling the output current according to the ...