AC Motor Regenerative Braking Circuit Design Using PWM and Microcontroller in PSIM

Hello everyone, I'm an engineer student and I'm trying to develop a circuit to reuse some energy that is stored  as kinetic energy in an AC motor. It will be used when the motor have to break, so the energy stored can be used to give it back to the companies, so we'll have an economy. The circuit I'm trying to develop is sketched in PSIM software. The aim of the circuit is to control the velocity of the motor with a PWM microcontroller (programmed in C, as the block in the circuit shows), and the same microcontroller will control the reuse of the energy again with a PWM. But the circuit isn't working like I want. Can anyone here help me or send me some material to study about this project? That's all, thanks. 
* The circuit image is in the attachments and the code of the C blocks is here below.
//PWM

float senoide[3], val = 0.1, freq = 40*3.14;

int tempo_total = 5;

if (t <= (tempo_total*0.75)){

y5 = 1;

senoide[0] = sin(freq*t);

senoide[1] = sin(freq*t - (120*3.14/180));

senoide[2] = sin(freq*t + (120*3.14/180));

if(senoide[0] >= val){

 y1 = 1;

} else {

 y1 = 0;

}

if(senoide[1] >= val){

 y2 = 1;

} else {

 y2 = 0;

}

if(senoide[2] >= val){

 y3 = 1;

} else {

 y3 = 0;

}

} else {

y1 = 0;

y2 = 0;

y3 = 0;

y4 = 1;

y5 = 0;

}
------------------------------------------------------------------------
//Controle da corrente fornecida para a rede

float corrente_max = 1;

if(x1 == 1){

if(x2 > corrente_max){

 y1 = 1;

} else {

 y1 = 0;

}

if(x3 > corrente_max){

 y2 = 1;

} else {

 y2 = 0;

}

if(x4 > corrente_max){

 y3 = 1;

} else {

 y3 = 0;

}

}

Hi Vinicius-I like the way you're thinking, but I think you might be overly optimistic.I don't know what the motor is being used for, but most motors aren't going to spend much of the time braking, and when they do need to brake you'll only get energy for a very short period of time as the motor decelerates the load.Also, I notice the power recovered from the motor is shown going into three loads.  As the motor decelerates the frequency of the output voltage will vary sharply.  I think you might come out ahead by using the voltage as DC and perhaps use it to charge some batteries.You probably already know this, but if the motor is a 3-phase induction motor you won't get any power out of it when you try to brake it.  It will have to be a 3-phase BLDC motor with a permanent magnet rotor in order for it to generate power.-Rick

Well, I think you're right Rick, I'm doing this work because my teacher said that I need to do it, but he doesn't explained how to do it, so I thought this was the right way, HAHA. But ok, I'll follow your advices and try my best, thank you!