System and method for impedance measurement using chirp signal injection

摘要

A method for impedance measurement using chirp signal injection is provided. The method includes injecting at least one chirp signal into the three-phase AC system, and collecting at least one response to the at least one chirp signal. The method further includes transferring the at least one response from abc coordinates to dq coordinates. At least one impedance is calculated based on the at least one response to the at least one chirp signal.

主权项

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.