昨天研究了传统的SVPWM生成方法之后 偶然看到了这个东西:
也就是说 SVPWM的占空比-角度的关系可以用分段函数进行表示 这样就简单多了
基本上通过查cos表+判断能避免浮点数运算 下面素程序www
结果输出到3个txt文件中,修改p的值可以算占空比(相电压)或者线电压...
/*
* SVPWM program
* By Rikka0_0
* 2014.4.47
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#define QUARTER_ROOT_3 433
#define QUARTER_TOT 750
#define CONSTANT_SCALER 1000
#define QUARTER_TOT 750
#define CONSTANT_SCALER 1000
unsigned char cosxFF[91]={255,254,254,254,254,254,253,253,252,251,251,250,249,248,247,246,245,243,242,241,239,238,236,234,232,231,229,227,225,223,220,218,216,213,211,208,206,203,200,198,195,192,189,186,183,180,177,173,170,167,163,160,156,153,149,146,142,138,135,131,127,123,119,115,111,107,103,99,95,91,87,83,78,74,70,65,61,57,53,48,44,39,35,31,26,22,17,13,8,4,0};
int Ua(unsigned int angle){
char sign=1;
if(angle>180){
angle-=180;
sign=-1;
}
if(0<=angle&&angle<60){
if(angle<30)
return sign*QUARTER_ROOT_3*cosxFF[30-angle]/CONSTANT_SCALER+128;
else
return sign*QUARTER_ROOT_3*cosxFF[angle-30]/CONSTANT_SCALER+128;
}else if(60<=angle&&angle<120){
if(angle<90)
return sign*QUARTER_TOT*cosxFF[angle]/CONSTANT_SCALER+128;
else
return -sign*QUARTER_TOT*cosxFF[180-angle]/CONSTANT_SCALER+128;
}else if(120<=angle&&angle<=180){
if(angle<150)
return -sign*QUARTER_ROOT_3*cosxFF[150-angle]/CONSTANT_SCALER+128;
else
return -sign*QUARTER_ROOT_3*cosxFF[angle-150]/CONSTANT_SCALER+128;
}
}
char sign=1;
if(angle>180){
angle-=180;
sign=-1;
}
if(0<=angle&&angle<60){
if(angle<30)
return sign*QUARTER_ROOT_3*cosxFF[30-angle]/CONSTANT_SCALER+128;
else
return sign*QUARTER_ROOT_3*cosxFF[angle-30]/CONSTANT_SCALER+128;
}else if(60<=angle&&angle<120){
if(angle<90)
return sign*QUARTER_TOT*cosxFF[angle]/CONSTANT_SCALER+128;
else
return -sign*QUARTER_TOT*cosxFF[180-angle]/CONSTANT_SCALER+128;
}else if(120<=angle&&angle<=180){
if(angle<150)
return -sign*QUARTER_ROOT_3*cosxFF[150-angle]/CONSTANT_SCALER+128;
else
return -sign*QUARTER_ROOT_3*cosxFF[angle-150]/CONSTANT_SCALER+128;
}
}
int Ub(unsigned int angle){
if(angle<120)
return Ua(120-angle);
else
return Ua(angle-120);
}
if(angle<120)
return Ua(120-angle);
else
return Ua(angle-120);
}
int Uc(unsigned int angle){
if(angle<240)
return Ua(240-angle);
else
return Ua(angle-240);
}
if(angle<240)
return Ua(240-angle);
else
return Ua(angle-240);
}
int main (){
int angle=0;
char p=1; //0-Phase voltage 1-Line voltage
FILE* u=fopen("u.txt","wb");
FILE* v=fopen("v.txt","wb");
FILE* w=fopen("w.txt","wb");
char t[10];
int angle=0;
char p=1; //0-Phase voltage 1-Line voltage
FILE* u=fopen("u.txt","wb");
FILE* v=fopen("v.txt","wb");
FILE* w=fopen("w.txt","wb");
char t[10];
while(angle<=360){
itoa(Ua(angle)-p*Ub(angle),t,10);
fputs(t,u);
fputs("\n",u);
itoa(Ub(angle)-p*Uc(angle),t,10);
fputs(t,v);
fputs("\n",v);
itoa(Uc(angle)-p*Ua(angle),t,10);
fputs(t,w);
fputs("\n",w);
angle+=1;
}
fclose(u);
fclose(v);
fclose(w);
system("Pause");
}
下面素一个周期内相电压(上)和线电压(下)的关系 可以看出相电压(占空比分布)呈不规则变化规律 而线电压呈完美的正弦波变化规律
itoa(Ua(angle)-p*Ub(angle),t,10);
fputs(t,u);
fputs("\n",u);
itoa(Ub(angle)-p*Uc(angle),t,10);
fputs(t,v);
fputs("\n",v);
itoa(Uc(angle)-p*Ua(angle),t,10);
fputs(t,w);
fputs("\n",w);
angle+=1;
}
fclose(u);
fclose(v);
fclose(w);
system("Pause");
}
下面素一个周期内相电压(上)和线电压(下)的关系 可以看出相电压(占空比分布)呈不规则变化规律 而线电压呈完美的正弦波变化规律