Implementation of Distribution Linear State Estimator: ComEd Experience

The reliable and resilient operation of a distributed energy resource (DER)-rich distribution grid requires real-time monitoring and control. Distribution phasor measurement units (D-PMUs) can provide time-stamped voltage and current phasor data at a high sampling rate, yielding real-time snapshots of electric distribution grids and microgrids. To leverage the synchrophasor data from D-PMUs deployed within the Bronzeville Community Microgrid (BCM), the Commonwealth Edison Company (ComEd) implemented, tested, and deployed a three-phase distribution linear state estimator (DLSE). The DLSE performs state estimation as fast as the PMU reporting rate, up to 60 times per second, while traditional state estimation (SE) typically solves just once every tens of seconds to a few minutes. This application can provide increased observability that supports real-time situational awareness and monitoring, aiding real-time operation, control, and optimization of the distribution system. This chapter describes practical aspects, assumptions, and processes for practical testing and deploying distribution linear state estimation tool, D-PMU ROSE.