Builing a Shunt active power filter in the synchronous reference frame

This schema representing a shunt active power filter in the synchronous reference frame, I'm focusing on the Area in the red box !

I want to learn how to build my own shunt active power filter in the synchronous reference frame from scratch, i understood pretty much the method behind it, but i am stack within Simulink, i followed the steps of the Algorithm one by one :

1. Get the load's current (scope : I_Load)
2. Clark Tranforation (scope : ab_Frame)
3. PLL Gives the SinW/CosW (scope : PLL)
4. Park transformation (scope : dq_Frame)
5. Extraction of the Harmonics currents (i*d & i*q)
6. Back from dq_Frame to ab_Frame (Park Inv)
7. Back from ab_Frame to abc_Frame (Clark Inv)

My Simulink Model :

I'm stack at step 5 (The blue box) Now that i have I_load in the dq frame,

How can i extract the compensation current i*d and i*q from iq_Load and id_Load ?

what is the simplest way to do that ? (in the schema up, they use an FTJ (the Orange box), what is that ? some also put LPF ( at 2*pi*50) why ?) .

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SCOPE OF THE CURRENT I_Load :

Answer 1

[abdelkader yousfi]

thank you I need MATLAB file about you "Builing a Shunt active power filter in the synchronous reference frame"