Block

Mask

Description

This block performs the Clarke transformation of an electrical three-phases system.

All the calculations performed by this block are made in the per-unit scale. Therefore, the user should ensure that inputs are correctly scaled before entering the block.

It is based on the following equations:

Parameters

These parameters have been optimized to provide an accuracy better than 0.01% for an angle resolution of 16 bits, and has been disabled. If a better resolution is needed, the expert developer can change the parameters by disabling the link between this block and the library.

Output number of bits	This parameter sets the number of bits used to format the outputs.
Output binary point	This parameter sets the outputs binary point location.

Inputs

x_a ,x_b ,x_c	These inputs are signals (currents, voltages etc...) expressed in the three phases reference frame in per unit scale. Their format is Fix18_16.

Outputs

x_α ,x_β ,x₀	These outputs are per unit signals (currents, voltages etc...) expressed in the Clarke two phases reference frame. "x₀" corresponds to the homopolar quantity and is equal to zero for balanced systems (x_a + x_b + x_c = 0). Their default format is Fix18_16 but can be specified by user through the mask parameters.

Characteristics and Limitations

This block cannot be used in Virtex5-based platforms, such as the ML50x series.

Direct Feedthrough	N/A
Discrete sample time	N/A
XHP support	YES
Work offline	YES

Clarke Transform