V&R Energy Systems Research, Inc.


ROSE, a real-time analysis tool, addresses the problem of utilizing the phasor measurement units (PMU) data to increase the situation awareness of the operators and improve stability and reliability of the electric transmission grid. ROSE continuously monitors power system conditions by incorporating high rate PMU data into calculations of stability margins and visualization, alarming the operator of the changes in the power system conditions before the next State Estimator case arrives. This allows the operator to take timely remedial actions to prevent the system instability. It defines the range of phasor measurements or other system parameters for which the system may securely operate in terms of the accepted N-k security criteria. In addition to voltage stability, voltage and thermal constraints may be simultaneously monitored, enforced and visualized on the ROSE boundary. Inside the boundary is the region of existence of solutions to power flow equations, or the region of stability existence of the system. Each point on the boundary corresponds to a “nose” point on the P-V curve, or a thermal or voltage constraint being violated. Operating within this region is secure; operating outside this region is infeasible or corresponds to unreliable operation of a power system. The ROSE calculates system steady-state limits in real-time operations under normal and contingency conditions. The ROSE computes MW/MVAr/MVA margin on the interfaces or at load pockets. The main purpose of the ROSE is to predict steady-state instability of transmission grid and alarm the operator about the impending crisis in real-time environment. ROSE increases situational awareness of the operators by allowing them to accurately and timely predict steady-state instability in real-time environment and avoid blackouts by using phasor quantities collected by PMUs.