SRM Current Controller

Current control for switched reluctance machines

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Libraries:
Simscape / Electrical / Control / SRM Control

Description

The SRM Current Controller block performs discrete-time proportional-integral (PI) current control for the Switched Reluctance Machine (SRM) block.

Equations

To determine the duty cycle, the block implements discrete-time proportional-integral (PI) current control in accordance with this equation.

$D=\left(K_p+K_i\frac{T_{s}z}{z-1}\right)\left(I_{s\_ref}-I_s\right)$

Where:

• D is the duty cycle.

• K_p is the proportional gain.

• K_i is the integral gain.

• T_s is the sample time.

• I_{s_ref} is the reference current.

• I_s is the measured current.

To obtain control signals for the three-phases, the block then multiplies the duty cycle with the commutation signals. The resulting three control signals are normalized over the interval [0, 1].

Examples

Switched Reluctance Machine Current Control

Control the current amplitude in a switched reluctance machine (SRM) based electrical drive. A DC voltage source feeds the SRM through a controlled three-arm bridge. An ideal angular velocity source provides the load. The converter turn-on and turn-off angles are maintained constant. A PI-based current controller regulates the current amplitude.

• Open Model

Ports

Input

IsRef — Reference current

scalar

Reference current for control.

Data Types: single | double

Is — Measured current

scalar

Measured current.

Data Types: single | double

Reset — Integrator reset

scalar

External reset signal (rising edge) for the integrator.

Data Types: Boolean

theta — Theta-rotor angle

scalar

Rotor angle in the interval [0, β ].

Data Types: single | double

thetaON — Switch-on angle

scalar

Angle for switching on the phase supply.

Data Types: single | double

thetaOFF — Switch-off angle

scalar

Angle for switching on the phase supply.

Data Types: single | double

Output

abcRef — Reference voltage

vector

Control signal normalized in the interval [0, 1].

Data Types: single | double

abcOnOff — Switch signal

vector

Switch signal for the a-, b-, and c-phases. 1 for the switch-on condition and 0 for switch-off condition

Data Types: single | double

Parameters

Proportional gain — Controller proportional gain, K_p

1 (default) | positive scalar

Proportional gain, K_p, of the controller.

Integral gain — Integral gain, K_i

5 (default) | positive scalar

Integral gain, K_i, of the controller.

Anti-windup gain — Anti-windup gain, K_aw

1 (default) | positive scalar

Anti-windup gain, K_aw, of the controller.

Sample time (-1 for inherited) — Block sample time

-1 (default) | positive scalar

Time, in s, between consecutive block executions. During execution, the block produces outputs and, if appropriate, updates its internal state. For more information, see What Is Sample Time? and Specify Sample Time.

If this block is inside a triggered subsystem, inherit the sample time by setting this parameter to -1. If this block is in a continuous variable-step model, specify the sample time explicitly using a positive scalar.

References

[1] Saha, N. and S. Panda. "Speed control with torque ripple reduction of switched reluctance motor by Hybrid Many Optimizing Liaison Gravitational Search technique." Engineering Science and Technology. Vol 20 (2017): 909–921.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2018a