Average-Value Inverter

Compute three-phase AC voltage from inverter DC voltage

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Libraries:
Motor Control Blockset / Electrical Systems / Inverters

Description

The Average-Value Inverter block models an average-value and full-wave inverter. It computes the three-phase AC voltage output from inverter DC voltage by using the duty cycle information.

Equations

These equations describe how the block computes the three-phase AC voltage.

$$D_0=\frac{(D_a+D_b+D_c)}{3}$$

$$V_a=V_{dc}\times (D_a-D_0)$$

$$V_b=V_{dc}\times (D_b-D_0)$$

$$V_c=V_{dc}\times (D_c-D_0)$$

where:

• $$D_a$$, $$D_b$$, and $$D_c$$ are the modulation indices ranging between 0 and 1.

• $$V_{dc}$$ is the DC bus voltage of the inverter (Volts).

• $$V_a$$, $$V_b$$, and $$V_c$$ are the output three-phase voltages (Volts).

Examples

Field-Oriented Control of Induction Motor Using Speed Sensor

Implements the field-oriented control (FOC) technique to control the speed of a three-phase AC induction motor (ACIM). The FOC algorithm requires rotor speed feedback, which is obtained in this example by using a quadrature encoder sensor. For details about FOC, see Field-Oriented Control (FOC).

• Open Model

Field-Oriented Control of PMSM Using Hall Sensor

Implements the field-oriented control (FOC) technique to control the speed of a three-phase permanent magnet synchronous motor (PMSM). The FOC algorithm requires rotor position feedback, which is obtained by a Hall sensor. For details about FOC, see Field-Oriented Control (FOC).

• Open Model

Ports

Input

D_abc — Duty cycle for three-phase voltage

1-by-3 array

Three-phase modulation indices in the range [0,1] for generating voltages that run the motor.

Data Types: single | double | fixed point

V_dc — Inverter DC voltage

scalar

DC bus voltage input to the inverter.

Data Types: single | double | fixed point | uint8 | uint16 | uint32

Output

V_abc — Three-phase voltage output

1-by-3 array

Three-phase voltage (Volts) corresponding to the input duty cycle that runs the motor.

Data Types: single | double | fixed point

Extended Capabilities

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

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced in R2020a