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>

#define QUARTER_ROOT_3 433

#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;

}

}

int Ub(unsigned int angle){

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);

}

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];

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