Part Number: TMS320F28035
Other Parts Discussed in Thread: CONTROLSUITE
Tool/software: TI C/C++ Compiler
Hi TI experts,
I am looking into the code provided by the TI controlsuite solar micro inverter example.
Project name: SolarMicroInv_F2803x. It is about the 3p3z controller. It is Build 2, no grid, resistor load, inverter only.
#define CNTL_3P3Z_IQ_MACRO(v, k) \
/* Calculate error */ \
k.Errn = k.Ref - k.Fdbk; \
k.Out = _IQ24mpy(v.Coeff_A3,k.Out3)+_IQ24mpy(v.Coeff_A2,k.Out2) + _IQ24mpy(v.Coeff_A1 , k.Out1) \
+ _IQ24mpy(v.Coeff_B3 ,k.Errn3)+_IQ24mpy(v.Coeff_B2 ,k.Errn2) + _IQ24mpy(v.Coeff_B1 , k.Errn1) + _IQ24mpy(v.Coeff_B0 , k.Errn); \
\
/* Update error values */ \
k.Errn3 = k.Errn2; \
k.Errn2 = k.Errn1; \
k.Errn1 = k.Errn; \
\
/* Determine new output */ \
k.Out = (k.Out < v.Max) ? k.Out : v.Max; \
k.Out = (k.Out > v.IMin) ? k.Out : v.IMin; \
\
/* Store outputs */ \
k.Out3 = k.Out2; \
k.Out2 = k.Out1; \
k.Out1 = k.Out; \
/* Saturated output */ \
k.Out = ((k.Out > v.Min) ? k.Out : v.Min);
My questions are:
(1) What is IMin? What is it for? What is the difference between IMin and Min? I saw in the main(), Min is initialized to be -0.97. But IMin is not. So I assume IMin is 0. Then it becomes problematic when .out become negative.
CNTL_3P3Z_IQ_COEFFS_init(&cntl3p3z_InvI_coeff);
cntl3p3z_InvI_coeff.Coeff_A2 = _IQ24(-0.6978);
cntl3p3z_InvI_coeff.Coeff_A3 = _IQ24(0.1137);
cntl3p3z_InvI_coeff.Coeff_B0 = _IQ24(0.2866);
cntl3p3z_InvI_coeff.Coeff_B1 = _IQ24(-0.3173);
cntl3p3z_InvI_coeff.Coeff_B2 = _IQ24(0.3338);
cntl3p3z_InvI_coeff.Coeff_B3 = _IQ24(-0.2616);
cntl3p3z_InvI_coeff.Min = _IQ24(-0.95);
(2) Where is the code for the two initialization functions ( CNTL_3P3Z_IQ_VARS_init(&cntl3p3z_InvI_vars); CNTL_3P3Z_IQ_COEFFS_init(&cntl3p3z_InvI_coeff))? I cannot find anywhere in the project.
Thank you in advance for your help.
