Patent ID: 9618555
Date: 2017-04-11
CPC Classifications: G01R

Claim:
1. A method of impedance measurement for a three-phase alternating current (AC) system, comprising: connecting an injection circuit of an impedance measurement unit to the three-phase AC system, the injection circuit comprising a voltage source inverter configured for drawing power from the three-phase AC system to charge a capacitor and for using discharged power from the capacitor to inject chirp signals into the three-phase AC system; injecting by the injection circuit at least one chirp signal into the three-phase AC system; collecting by a collection circuit of the impedance measurement unit at least one response to the at least one chirp signal; transferring by an instrumentation platform computer the at least one response from three-phase (abc) coordinates to direct and quadrature (dq) coordinates; and calculating by a control circuit at least one impedance of the three-phase AC system based on the at least one response to the at least one chirp signal.