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Inverter Voltage measurement

lyledunn

Suppose I have an inverter 150m from intake. When delivering output, how does it establish and continue to monitor the reference grid voltage? 

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    This, from the COP for Grid Connected solar PV Systems, is what I am getting at;

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    In short it does not really - rather it measures " knows" the voltage at its terminals, and the current it is pushing out, and how much increasing that current uplifts the terminal voltage . It is not exact - there is no magical way it can 'know' if other loads have come on or off and altered things.

    I suppose one might have remote radio telemetry or extra sense cables on a really big system - it's not the norm.
    Mike.

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    As   says, the inverter operates based on the voltage at its terminals, and knows the current it's driving out (so knows the 'overdrive voltage' to provide.

    The reason for the 1 % volt-drop (or what is in effect "voltage rise" over the grid voltage) is that you can get the situation where the inverter is dropping out repeatedly because it has an upper "overvoltage trip" threshold according to G98/G99, if it has to drive over too long a line to reach the grid.

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