Make plausibilization between EvsePresentVoltage and hardware inlet voltage measurement

[uhi22]

Discussion started here: https://openinverter.org/forum/viewtopic.php?p=82256#p82256

Current implementation: The inlet voltage is either taken from the charging station (EvsePresentVoltage) or from the hardware input.

Improvement idea: If hardware voltage measuring device is present, make a plausibilization between the hardware input and the EvsePresentVoltage. Raise an error and stop charging if the difference is too big (e.g. 20V).

Steps for implementation:

• create a parameter InletVoltageToleranceHwEvse ("Inlet voltage tolerance between hardware input and EvsePresentVoltage). Default 20V.
• if the inletVoltageSource is configured to hardware input, compare it with the EvsePresentVoltage
• plausibilization makes most sense in states PreCharge and CurrentDemand. Define, whether these shall be the only states or whether there are other states, where the plausibilization makes sense
• Set a senseful abortReason (and maybe a red blink code?) to give the user the chance to understand the root cause of a problem.

[uhi22]

For the inlet voltage plausibilization, implemented a draft. It works like this:

• The voltage measured by the hardware board is always reported in spot value InletVoltageHw.
• The voltage reported by the charging station is available in spot value EvsePresentVoltage.
• If the hardware measurement is selected by parameter InletVtgSrc = AnalogInput, we calculate the absolute difference between InletVoltageHw and EvsePresentVoltage, and store the result in spot value InletVoltageDeviation.
• If the InletVoltageDeviation is bigger than the parameter InletVoltageTolerance (default 20V), we set an error flag.
• If we see during the charging loop this error flag, we stop the charging with stopreason STOP_REASON_INLET_VOLTAGE_DEVIATION.

Potential issues:

• nearly untested at the moment.
• detection could be too fast, maybe we should add a debouncing, so that a short voltage deviation does not abort the charging session.