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Implemented a better balancing algorith for string balancing

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* Added error logging to inverter fb
* Changed HMI actual power feedback from dc to ac power
* Small config adjustments
This commit is contained in:
Matthias Heisig
2025-04-16 12:35:06 +02:00
parent 082c250543
commit 7b810b19d2
5 changed files with 61 additions and 46 deletions
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12
PLC/POUs/MAIN.TcPOU
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@@ -131,6 +131,7 @@ VAR
// Sum of voltage of all active strings
_rStringsSumVoltage : REAL;
_rDeltaUm : REAL;
_arPowerString : ARRAY[0..(GVL_CONFIG.uiNumberOfStrings-1)] OF REAL;
_ui : UINT := 0;
@@ -607,7 +608,7 @@ GVL_SCADA.xCanChangeControlMode := _xCanChangeMode;
GVL_SCADA.eCurrentControlMode := _eBMSControlMode;
// Calculate current battery dc power
GVL_SCADA.diCurrentBatteryPower := REAL_TO_DINT(_afbStrings[0].stInverterData.rActDCPower + _afbStrings[1].stInverterData.rActDCPower);
GVL_SCADA.diCurrentBatteryPower := REAL_TO_DINT(_afbStrings[0].stInverterData.rActACPower + _afbStrings[1].stInverterData.rActACPower);
// Read power values if commanded
_fbPowerMeterPower(
@@ -927,14 +928,17 @@ _fbPowerMeter24V();]]></ST>
END_CASE
// Calculate string power balancing
IF _rStringsSumVoltage <> 0 THEN
IF _rStringsSumVoltage <> 0 AND (GVL_CONFIG.uiNumberOfStrings <> 0) THEN
FOR _ui := 0 TO (GVL_CONFIG.uiNumberOfStrings-1) DO
// Calculate delta u to middle voltage
_rDeltaUm := (_afbStrings[_ui].rCurrentVoltage * GVL_CONFIG.uiNumberOfStrings - _rStringsSumVoltage) / _rStringsSumVoltage;
// Discharging
IF _rPowerInverter > 0 THEN
_arPowerString[_ui] := _rPowerInverter * (_afbStrings[_ui].rCurrentVoltage / _rStringsSumVoltage);
_arPowerString[_ui] := (_rPowerInverter / GVL_CONFIG.uiNumberOfStrings) * ( 1 + (_rDeltaUm * GVL_CONFIG.rBalancingFactor));
// Charging
ELSIF _rPowerInverter < 0 THEN
_arPowerString[_ui] := _rPowerInverter * (1.0 - (_afbStrings[_ui].rCurrentVoltage / _rStringsSumVoltage));
_arPowerString[_ui] := (_rPowerInverter / GVL_CONFIG.uiNumberOfStrings) * ( 1 - (_rDeltaUm * GVL_CONFIG.rBalancingFactor));
// Nothing
ELSE
_arPowerString[_ui] := 0.0;