2013. — 13 c.A new method of computing angle distances for use in Wide Area Measurement (WAM) system performance is described. From this, unambiguous angle differences are computed. The concept is supported using a continuum view of the electric power grid. The wide area system is considered to be described by a set of partial differential equations rather than the traditional view of differential-algebraic equations. This approach explains observed behavior both in the Eastern Interconnection and the WECC.
The measurements are collected using a cyber-secure synchrophasor platform (CSSP) installed at the University of California, San Diego (UCSD) sensing low voltage single phase circuits on the local microgrid. The CSSP consists of redundant phasor measurement units (PMUs) with dual substation-hardened computers. The purpose of the CSSP is to provide a secure base system for use in real time computations for power system as well as providing local visibility for substation personnel and supporting control system calculations providing UCSD facility operators with information to prepare for a potential island maneuver. This configuration allows the system to be patched as required by the North America Electric Reliability Council (NERC) while still continuing to collect necessary data for real time computation (NERC CIP) requirements.
The CSSP includes a short-term archive of PMU synchrophasor data and real-time computations of Fast Fourier Transforms (FFTs) and damping coefficients at each mode. Angle separation and FFTs of the data are used to identify a potential island maneuver that might be executed.
