# PLL with Feed Forward

Compute position and angular frequency from orthogonal sinusoidal signals

*Since R2023b*

**Libraries:**

Motor Control Blockset /
Signal Management

## Description

The PLL with Feed Forward block computes angular position (θ) or its sine and cosine equivalents (sin θ, cos θ) and the angular frequency (ω) from two orthogonal sinusoidal signals.

In addition to the angular frequency, the block uses either a sine-cosine lookup table
to calculate the angular position or an oscillator based algorithm to compute the sine and
cosine equivalents of position. You can use the **Position output**
parameter to output either angular position or its sine and cosine equivalents.

The two orthogonal sinusoidal input signals must have identical peak magnitudes. If the
inputs are not normalized in the range of [-1,1], select the **Enable input
normalization** parameter.

The following image shows the relationship between block inputs and outputs:

For more information on the block algorithm, see Algorithm.

**Note**

The block does not support 16-bit fixed-point inputs.

## Ports

### Input

### Output

## Parameters

## Algorithms

## References

[1] *G. Liu, H. Zhang and
X. Song, "Position-Estimation Deviation-Suppression Technology of PMSM Combining Phase
Self-Compensation SMO and Feed-Forward PLL," in IEEE Journal of
Emerging and Selected Topics in Power Electronics, vol. 9, no. 1, pp.
335-344, Feb. 2021, doi: 10.1109/JESTPE.2020.2967508.*

[2] *Se-Kyo Chung, "A
phase tracking system for three phase utility interface inverters," in IEEE Transactions on Power Electronics, vol. 15, no. 3, pp.
431-438, May 2000, doi: 10.1109/63.844502.*

[3] *Sreeraman Rajan,
Sichun Wang, Robert Inkol, and Alain Joyal. "Efficient Approximations for the Arctangent
Function." IEEE SIGNAL PROCESSING MAGAZINE (MAY 2006).*

## Extended Capabilities

## Version History

**Introduced in R2023b**