grabowski
e7a23a3c7e
STM32G474RB firmware for solar buck converter with MPPT, CC control, Vfly compensation, and adaptive deadtime. Includes Textual TUI debug console for real-time telemetry, parameter tuning, and SQLite logging. Added pyproject.toml for uv: `cd code64 && uv run debug-console` Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
|
|
* mppt.c
|
|
*
|
|
* Created on: Jun 11, 2025
|
|
* Author: janik
|
|
*/
|
|
|
|
|
|
#include "mppt.h"
|
|
#include <math.h> // for fabsf
|
|
|
|
void MPPT_IncCond_Init(MPPTController *mppt,
|
|
float initial_iref,
|
|
float step,
|
|
float iref_min,
|
|
float iref_max,
|
|
float dv_min)
|
|
{
|
|
mppt->last_vin = 0.0f;
|
|
mppt->last_iin = 0.0f;
|
|
mppt->iref = initial_iref;
|
|
mppt->step = step;
|
|
mppt->iref_min = iref_min;
|
|
mppt->iref_max = iref_max;
|
|
mppt->dv_min = dv_min;
|
|
mppt->deadband = 0.005f;
|
|
}
|
|
|
|
float MPPT_IncCond_Update(MPPTController *mppt, float vin, float iin)
|
|
{
|
|
float dv = vin - mppt->last_vin;
|
|
float di = iin - mppt->last_iin;
|
|
|
|
// Skip if input voltage is essentially zero
|
|
if (vin < 1e-2f)
|
|
return mppt->iref;
|
|
|
|
// Suppress update if both dv and di are below noise floor
|
|
if (fabsf(dv) < mppt->dv_min && fabsf(di) < mppt->dv_min)
|
|
return mppt->iref;
|
|
|
|
/* dP = vin*di + iin*dv (avoids dv division, works even when dv is small) */
|
|
float dp = vin * di + iin * dv;
|
|
float p = vin * iin; /* current power (mV*mA = nW scale) */
|
|
|
|
/* Relative deadband: |dP| < 0.5% of P => near MPP */
|
|
if (p > 1e3f && fabsf(dp) < mppt->deadband * fabsf(p)) {
|
|
// At or near MPP — don't step
|
|
} else if (dp > 0) {
|
|
mppt->iref -= mppt->step;
|
|
} else {
|
|
mppt->iref += mppt->step;
|
|
}
|
|
|
|
// Clamp
|
|
if (mppt->iref > mppt->iref_max) mppt->iref = mppt->iref_max;
|
|
if (mppt->iref < mppt->iref_min) mppt->iref = mppt->iref_min;
|
|
|
|
// Save state
|
|
mppt->last_vin = vin;
|
|
mppt->last_iin = iin;
|
|
|
|
return mppt->iref;
|
|
}
|