Using Passivity Theory to Interpret the Dissipating Energy Flow Method
For power system engineers, this work provides a theoretical foundation to improve a practical oscillation source location method.
The paper uses passivity theory to interpret the dissipating energy flow method for locating forced oscillation sources in power systems, identifying reasons for its deficiencies and setting up a framework for improvement. The theorems are tested via simulation on a simple infinite bus model.
Despite wide-scale deployment of phasor measurement unit technology, locating the sources of low frequency forced oscillations in power systems is still an open research topic. The dissipating energy flow method is one source location technique which has performed remarkably well in both simulation and real time application at ISO New England. The method has several deficiencies, though, which are still poorly understood. This paper borrows the concepts of passivity and positive realness from the controls literature in order to interpret the dissipating energy flow method, pinpoint the reasons for its deficiencies, and set up a framework for improving the method. The theorems presented in this paper are then tested via simulation on a simple infinite bus power system model.