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Task:

Create a model of the drive system enabling the adjustment of the angular rotor position of

permanent magnet synchronous motor. The motor is powered by a three-phase three-level

NPC inverter controlled by a pulse width modulation. Field Oriented Control (FOC) should

be used to realize feedback control system of the machine. The model should be made in the

PLECS Standalone program.

Following points must be included in the project

1. The converter is powered by a DC voltage source.

2. Use the following elements for modeling the NPC converter: IGBT and diodes.

3. Use the PMSM motor model from the PLECS library.

4. Perform all calculations of the feedback control systems and transformation of coordinate

systems in a C-Script block in C programming language.

6. Apply the controllers output limitations and anti-windup back calculation for PI controllers.

7. The settings of current PI controllers should be calculated according to the criterion of the

modulus optimum

8. The settings of the speed PI controller should be calculated according to the criterion of

symmetrical optimum

9. Design the P angular position controller by trial and error method

10. Create a modulator with a zero sequence signal (ZSS-PWM).

Machine and converter parameters:

p＝4% number of pole pairs

Ls＝0.01557; %H Ld＝Lq＝Ls Stator inductance

Rs＝1.1; %Ohm Stator Resistance

J＝0.005066; %kgm2 Moment of the inertia

psi_f＝0.2667; %Wb Magnetic flux-linkage PM

Mn＝15.2; %Nm Nominal load torque

ct＝0.001; % Friction coefficient

Omega＝1200; %rpm Nominal rotational speed

In＝6.8; % A Nominal stator current RM

U_dc＝300% V DC-link voltage

F_sw＝5000; % Hz switching frequency

notes ( using plexim )