Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Reexamination Certificate
2008-06-09
2011-10-11
Dole, Timothy J (Department: 2858)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
C307S016000, C700S286000
Reexamination Certificate
active
08035369
ABSTRACT:
The subject matter of the invention is a method for detecting an isolated network for an inverter (2) carrying a converter voltage that is adapted for connection in parallel with a grid (5) having a mains frequency and electric loads and that is decoupled from the grid (5) by a choke (3), a test signal being superimposed upon the converter voltage at a test frequency the frequency of which is smaller than the mains frequency, the amplitude of the test signal being much smaller than the nominal voltage amplitude of the mains voltage on the one side but still just large enough on the other side for changes in reactive power to be detectable as a result of the test signal, a reactive power share being determined, which oscillates with the test frequency, this share not being allowed to fall below an imposed minimum for an isolated operation to be reliably excluded.
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Bechtel Neidhardt
Hardt Christian
Strnad Michael
Dole Timothy J
Eschweiler & Associates LLC
SMA Solar Technology AG
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