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Title: Electrical Power System Current and Voltage Instrumentation Channel Error Correction Using Unconstrained Weighted-Least-Squares (WLS) Dynamic State Estimation
Committee:
Dr. Meliopoulos, Advisor
Dr. Molzahn, Chair
Dr. Habetler
Abstract:
The objective of the proposed research is to study the problem of error introduction in electric power system instrumentation channels and investigate the application of a model-based Dynamic State Estimation (DSE) method, in a Proof-Of-Concept sense, to correctly estimate the electrical quantity on the primary-side of an instrument transformer. The merits of the proposed research are encapsulated by its novelty, which can summarily be described by: (1) its use of the nonideal, detailed, electrical model of the instrumentation channel of the device under study; (2) its model development and the algorithmic error correction method; (3) the feasibility of executing the algorithm in real-time. The broader impacts of the proposed research span multiple power system application areas, including but not limited to the following areas: power system protection; power system monitoring; power system state estimation, and, instrumentation channel parameter health monitoring. The instrumentation channel provides the only way by which intelligent connected devices or subsystems obtain information about the power system for subsequent analyses and decision-making. The hardware implementation of the proposed method is anticipated to provide an alternative secondary connection that provides real-time estimates of the correct primary quantities of the instrument transformer to connected devices. In power system protection, this implementation may improve relay protection reliability under CT saturation, CT subsidence and CCVT transient conditions. With respect to system monitoring, this implementation could assure the provision of reliable voltage and current data for monitoring, powerflow calculations and state estimation, especially when channel error introduction corrupts the outputs of the physical channel. Conducted preliminary research has yielded promising results.
