SRM Current Controller

Current control for switched reluctance machines

• Library:
• 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.

• Kp is the proportional gain.

• Ki is the integral gain.

• Ts is the sample time.

• Is_ref is the reference current.

• Is 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].

Ports

Input

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Reference current for control.

Data Types: single | double

Measured current.

Data Types: single | double

External reset signal (rising edge) for the integrator.

Data Types: Boolean

Rotor angle in the interval [0, β ].

Data Types: single | double

Angle for switching on the phase supply.

Data Types: single | double

Angle for switching on the phase supply.

Data Types: single | double

Output

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

Data Types: single | double

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

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Proportional gain, Kp, of the controller.

Integral gain, Ki, of the controller.

Anti-windup gain, Kaw, of the controller.

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.

 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.