I'm trying to make a power factor correction system using arduino.
In the first i successes to calculate the PF using arduino and XOR gate
Following picture is my circuit:
simulate this circuit – Schematic created using CircuitLab
But now i want to convert this project to PFC by connecting some relays to the arduino to connecting some capacitors to the inductive load during PFC process.
This is my code:
int pin = 13;
int cap1 = 6; //0.5 micro farad capacitor
int cap2 = 7; //0.5 micro farad capacitor
int cap3 = 8; //0.5 micro farad capacitor
int cap4 = 9; //0.5 micro farad capacitor
int cap5 = 10; //0.5 micro farad capacitor
int cap6 = 11; //0.5 micro farad capacitor
/*Variables will change their value:*/
double duration,duration1,T=20;
double si,phi;
double power_factor;
void setup()
{
pinMode(pin, INPUT);
Serial.begin(9600);
pinMode(cap1, OUTPUT);
pinMode(cap2, OUTPUT);
pinMode(cap3, OUTPUT);
pinMode(cap4, OUTPUT);
pinMode(cap5, OUTPUT);
pinMode(cap6, OUTPUT);
}
void loop()
{
getpf();
if(power_factor < 0.98)
{
digitalWrite(cap1, HIGH);
getpf();
Serial.println(power_factor);
if(power_factor <0.98)
{
digitalWrite(cap2, HIGH);
getpf();
Serial.println(power_factor);
if(power_factor <0.98)
{
digitalWrite(cap3, HIGH);
getpf();
Serial.println(power_factor);
if(power_factor <0.98)
{
digitalWrite(cap4, HIGH);
getpf();
Serial.println(power_factor);
if(power_factor <0.98)
{
digitalWrite(cap5, HIGH);
getpf();
Serial.println(power_factor);
if(power_factor <0.98)
{
digitalWrite(cap5, HIGH);
getpf();
Serial.println(power_factor);
if(power_factor <0.98)
{
digitalWrite(cap6, HIGH);
getpf();
Serial.println(power_factor);
}
}
}
}
}
}
}
else if(power_factor >= 0.98)
{
Serial.println(power_factor);
}
}
void getpf()
{
duration = pulseIn(pin, HIGH);
duration1=(duration/1000);
si=(duration1/20);
phi=(si*360);
power_factor=cos(phi/57.2);
}
Each capacitor with value of 0.5uF connect to relays and the relays connected to pin 6, pin 7, pin 8, pin 9, pin 10, pin 11
I have 3 problems with this project:
1-When the power factor is low and the load need to only two capacitors(0.5 + 0.5 = 1uF), all relays turn ON together (i think there are problem in "if getpf" command.)
2-When i opens the serial monitor in IDE to see the power factor number, the system reset and relays turn ON and OFF
3-Why i can't measure PF of harmonic load by this project? however i know i can't correct the PF of harmonic load by adding capacitors to the load, but why i can't measure the power factor of harmonic load correctly?
