State estimation for power system using hybrid measurements

摘要

A method determines voltages of buses of a power system. Values the voltages include a magnitude and a phase angle. The buses of the power system are grouped in a first area and a second area based on a type of measurement associated with each bus. The first area and the second area have at least one common bus, and wherein at least one bus in the first area is associated with a first type of measurement, and at least one bus in the second area is associated with a second type of measurement. Next, the method determines sequentially voltages of the buses of the first and the second areas.

主权项

1. A computer-implemented method for determining voltages of a set of buses of a power system, wherein values of the voltages include a magnitude and a phase angle of the voltages, comprising steps of:
providing a connectivity topology of buses connected through branches, wherein the connectivity topology represents such that a bus of the power system is connected with at least one bus of the power system through a branch, wherein each of the buses is associated with a first type of measurement unit or a second type of measurement unit; partitioning the set of buses of the power system into a first-type area and a second-type area based on the connectivity topology of the buses and a type of measurement unit associated with each bus, wherein the first-type area and the second-type area have at least one common bus, and wherein all buses in the first-type area are associated with the first type of measurement unit, and all buses in the second-type area are associated with the second type of measurement unit; calculating the voltages of the buses of the first-type area including the voltage of the common bus based on first type of measurements of the first-type of measurement unit and pseudo measurements derived from second type of measurements of the second type of measurement unit by minimizing a sum of weighted square of measurement errors for all measurements associated with the first-type area; and calculating the voltages of the set of buses of the second-type area using the voltage of the common bus calculated for the first-type area and the second type of measurements of the second type of measurement unit by minimizing a sum of weighted square of measurement errors for all measurements associated with the second-type area, wherein the steps of the method are performed by a processor.