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Line to Line Injection System for Power Impedance Measurements

*Abstract: This invention is a process whereby a single-phase current can be injected between two lines of a three-phase ac system for the purpose of measuring source and load impedances (source and load are defined by the point at which the current is injected). Besides the injection and signal demodulation process, this invention details a practical current injection device which is a simple power electronic circuit. The circuit is also capable of injecting currents in a dc system for impedance measurement. Impedances can be measured over a wide range of frequencies for applications such as machine parameter measurement and power system stability assessment.

*Principal Investigation: Name: Jing Huang
Department:

Name: Keith Corzine, Associate Professor
Department:

Name: Mohamed Belkhayat, employee of Northrop Grumman Newport News
Department:

附加資料: Inventor: Belkhayat, Mohamed | Huang, Jing | Corzine, Keith
Priority Number: US7746084B2
IPC Current: G01R002728
US Class: 324649 | 324107
Assignee Applicant: Newport News Shipbuilding and Dry Dock Company,Newport News | The Curators of the University of Missourilumbia
Title: Impedance measurement using line-to-line current injection
Usefulness: Impedance measurement using line-to-line current injection
Summary: Method for measuring impedance in three-phase AC circuit used in power systems used in e.g. naval ship, aerospace.
Novelty: Method for measuring impedance in three-phase alternating current (AC) circuit involves calculating impedance of source portion and load portion of three-phase AC circuit using two sets of transformed voltages and transformed currents

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