svgen_dq.c

TI公司28XDSP控制永磁同步电机(PMSM)

/*=====================================================================================
 File name:        SVGEN_DQ.C  (IQ version)                  
                    
 Originator:	Digital Control Systems Group
			Texas Instruments

 Description:  Space-vector PWM generation based on d-q components                    

=====================================================================================
 History:
-------------------------------------------------------------------------------------
 04-15-2005	Version 3.20
-------------------------------------------------------------------------------------*/

#include "IQmathLib.h"         // Include header for IQmath library 
// Don't forget to set a proper GLOBAL_Q in "IQmathLib.h" file
#include "dmctype.h"
#include "svgen_dq.h"

void svgendq_calc(SVGENDQ *v)
{	

	_iq Va,Vb,Vc,t1,t2;
	Uint32 Sector = 0;  // Sector is treated as Q0 - independently with global Q
																	
// Inverse clarke transformation
    Va = v->Ubeta;
    Vb = _IQmpy(_IQ(-0.5),v->Ubeta) + _IQmpy(_IQ(0.8660254),v->Ualpha);  // 0.8660254 = sqrt(3)/2 
    Vc = _IQmpy(_IQ(-0.5),v->Ubeta) - _IQmpy(_IQ(0.8660254),v->Ualpha);  // 0.8660254 = sqrt(3)/2

// 60 degree Sector determination
    if (Va>_IQ(0))
       Sector = 1; 
    if (Vb>_IQ(0))
       Sector = Sector + 2;
    if (Vc>_IQ(0))   
       Sector = Sector + 4;
       
// X,Y,Z (Va,Vb,Vc) calculations
    Va = v->Ubeta;                                                       // X = Va 
    Vb = _IQmpy(_IQ(0.5),v->Ubeta) + _IQmpy(_IQ(0.8660254),v->Ualpha);   // Y = Vb 
    Vc = _IQmpy(_IQ(0.5),v->Ubeta) - _IQmpy(_IQ(0.8660254),v->Ualpha);   // Z = Vc
    
    if (Sector==0)  // Sector 0: this is special case for (Ualpha,Ubeta) = (0,0)
    {
       v->Ta = _IQ(0.5);
       v->Tb = _IQ(0.5);
       v->Tc = _IQ(0.5);
    }
    if (Sector==1)  // Sector 1: t1=Z and t2=Y (abc ---> Tb,Ta,Tc)
    {
       t1 = Vc;
       t2 = Vb;
       v->Tb = _IQmpy(_IQ(0.5),(_IQ(1)-t1-t2));      // tbon = (1-t1-t2)/2
       v->Ta = v->Tb+t1;                             // taon = tbon+t1
       v->Tc = v->Ta+t2;                             // tcon = taon+t2
    }
    else if (Sector==2)  // Sector 2: t1=Y and t2=-X (abc ---> Ta,Tc,Tb)
    {
       t1 = Vb;
       t2 = -Va;
       v->Ta = _IQmpy(_IQ(0.5),(_IQ(1)-t1-t2));      // taon = (1-t1-t2)/2
       v->Tc = v->Ta+t1;                             // tcon = taon+t1
       v->Tb = v->Tc+t2;                             // tbon = tcon+t2
    }      
    else if (Sector==3)  // Sector 3: t1=-Z and t2=X (abc ---> Ta,Tb,Tc)
    {
       t1 = -Vc;
       t2 = Va;
       v->Ta = _IQmpy(_IQ(0.5),(_IQ(1)-t1-t2));      // taon = (1-t1-t2)/2
       v->Tb = v->Ta+t1;                             // tbon = taon+t1
       v->Tc = v->Tb+t2;                             // tcon = tbon+t2
    }   
    else if (Sector==4)  // Sector 4: t1=-X and t2=Z (abc ---> Tc,Tb,Ta)
    {
       t1 = -Va;
       t2 = Vc;
       v->Tc = _IQmpy(_IQ(0.5),(_IQ(1)-t1-t2));      // tcon = (1-t1-t2)/2
       v->Tb = v->Tc+t1;                             // tbon = tcon+t1
       v->Ta = v->Tb+t2;                             // taon = tbon+t2
    }   
    else if (Sector==5)  // Sector 5: t1=X and t2=-Y (abc ---> Tb,Tc,Ta)
    {
       t1 = Va;
       t2 = -Vb;
       v->Tb = _IQmpy(_IQ(0.5),(_IQ(1)-t1-t2));      // tbon = (1-t1-t2)/2
       v->Tc = v->Tb+t1;                             // tcon = tbon+t1
       v->Ta = v->Tc+t2;                             // taon = tcon+t2
    }   
    else if (Sector==6)  // Sector 6: t1=-Y and t2=-Z (abc ---> Tc,Ta,Tb)
    {
       t1 = -Vb;
       t2 = -Vc;
       v->Tc = _IQmpy(_IQ(0.5),(_IQ(1)-t1-t2));      // tcon = (1-t1-t2)/2
       v->Ta = v->Tc+t1;                             // taon = tcon+t1
       v->Tb = v->Ta+t2;                             // tbon = taon+t2 
    }
    
// Convert the unsigned GLOBAL_Q format (ranged (0,1)) -> signed GLOBAL_Q format (ranged (-1,1))
    v->Ta = _IQmpy(_IQ(2.0),(v->Ta-_IQ(0.5)));
    v->Tb = _IQmpy(_IQ(2.0),(v->Tb-_IQ(0.5)));
    v->Tc = _IQmpy(_IQ(2.0),(v->Tc-_IQ(0.5)));        

}