Automatic Power Factor Correction Circuit Simulation with PIC16F877A and Proteus

Someone help me to compile this program for automatic power factor correction using PIC 16F877A and if there is a circuit which can be simulated in proteus. I am doing this project but I am stuck for one month up to now. Automatic Power Factor Controller using PIC Microcontroller Circuit Diagram The 230 V, 50 Hz is step downed using voltage transformer and current transformer is used to extract the waveforms of current. The output of the voltage transformer is proportional to the voltage across the load and output of current transformer is proportional to the current through the load. These waveforms are fed to Voltage Comparators constructed using LM358 op-amp. Since it is a zero crossing detector, its output changes during zero crossing of the current and voltage waveforms. These outputs are fed to the PIC which does the further power factor calculations. Microcontroller Section PIC 16F877A microcontroller is the heart of this Automatic Power Factor Controller, it find, displays and controls the Power Factor.. To correct power factor, first we need to find the current power factor. It can be find by taking tangent of ratio of time between zero crossing of current and voltage waveforms and two successive zero crossing of voltage waveform. Then it displays the calculated power factor in the 16×2 LCD Display and switches ON the capacitors if required. Correction Section When load is connected the power factor is calculated by the PIC microcontroller. If the calculated power factor is less than 0.9 then the relay switches on the capacitor. The relays are switched using ULN2003 which is basically a driver IC. ULN2003 consists of seven DARLINGTON PAIRS. The current lead in capacitor compensates the corresponding current lag which is usually present in loads. Hence the phase difference between the current and voltage will be reduced. Power Factor Correcting capacitor connected parallel to load through relay, if the relay is energized by microcontroller it will connect the capacitor parallel with load, if relay deenergized it will remove the capacitor from the load. When the resistive load is on the power factor will be near to unity so the microcontroller doesn’t energize the relay coil. When the inductive load is on the power factor decrease now the microcontroller energize the relay coil in order to compensate the excessive reactive power. Hence according to the load the power factor is corrected. MikroC Program //LCD Module Connections sbit LCD_RS at RB4_bit; sbit LCD_EN at RB5_bit; sbit LCD_D4 at RB0_bit; sbit LCD_D5 at RB1_bit; sbit LCD_D6 at RB2_bit; sbit LCD_D7 at RB3_bit; sbit LCD_RS_Direction at TRISB4_bit; sbit LCD_EN_Direction at TRISB5_bit; sbit LCD_D4_Direction at TRISB0_bit; sbit LCD_D5_Direction at TRISB1_bit; sbit LCD_D6_Direction at TRISB2_bit; sbit LCD_D7_Direction at TRISB3_bit; //End LCD Module Connections int powerFactor() { int a=0,b=0,t=0,x=0; float tm,pf; TMR1L=0; TMR1H=0; do { if(PORTA.F0 == 1) T1CON.F0 = 1; else if(PORTA.F0 == 0 && T1CON.F0 == 1) { T1CON.F0 = 0; break; } }while(1); a = (TMR1L | (TMR1H<<8)) * 2; TMR1L=0; TMR1H=0; do { if(PORTA.F0 == 1) { T1CON.F0=1; if(PORTA.F1==1) { T1CON.F0=0; break; } } }while(1); b = TMR1L | (TMR1H<<8); tm = (float)b/a; pf = cos(tm*2*3.14); x=abs(ceil(pf*100)); return x; } void main() { char c[]="0.00"; int a,b,d,x,f,e; float tm,pf; Lcd_Init(); Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off ADCON1 = 0x08; // To configure PORTA pins as digital TRISA.F0 = 1; // Makes First pin of PORTA as input TRISA.F1 = 1; //Makes Second pin of PORTA as input TRISD.F0 = 0; //Makes Fist pin of PORTD as output TRISD.F1 = 0; //Makes Second pin of PORTD as output while(1) { a = powerFactor(); Delay_us(50); b = powerFactor(); Delay_us(50); d = powerFactor(); Delay_us(50); e = powerFactor(); Delay_us(50); f = powerFactor(); x = (a+b+d+f+e)/5; c[3]=x%10 + 0x30; x=x/10; c[2]=x%10 + 0x30; x=x/10; c[0]=x%10 + 0x30; Lcd_Out(1,1,"Power Factor"); Lcd_Out(2,1,c); if(x<90) { PORTD.F0 = 1; PORTD.F0 = 1; Delay_ms(2000); } else { PORTD.F0 = 0; PORTD.F0 = 0; } Delay_ms(250); } }


Automatic Power Factor Correction Using PIC Microcontroller

Excellent invention ! Could probably be built into a cheap and simple plug-in unit.
This will stop Joe Public from paying for power he doesn't use.
When this device is marketed, I want one please !

I wnat to check this program

Best regards


/LCD Module Connections
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;
sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
//End LCD Module Connections
int powerFactor()
{ int a=0,b=0,t=0,x=0; float tm,pf; TMR1L=0; TMR1H=0; do { if(PORTA.F0 1) T1CON.F0 = 1; else if(PORTA.F0 0 && T1CON.F0 1) { T1CON.F0 = 0; break; } }while(1); a = (TMR1L | (TMR1H

I assume the circuit switches the capacitor in when the PF is lagging and switches the capacitor out when the PF is leading. Hysteresis should be incorporated so that the circuit does not continually switch the capacitor in and out of circuit. The current magnitude - and not just phase - can be used as part of the capacitor decision algorithm. This would prevent the capacitor from being switched in when the current is too low and pulling the PF too leading.