Optimal phasor measurement unit (PMU) placement for the power systems with existing SCADA measurements

Ertürk, Bulut
It is extremely important to maintain efficiency, sustainability and reliability of the generation, transmission and distribution of the electrical energy; hence it is mandatory to monitor the system in real time. State estimation has a key role in real time monitoring of a power system. The considered power system has to be observable in order to perform state estimation. Traditionally, power system state estimators employ SCADA measurements. However, as the number of Phasor Measurement Units (PMUs) increase in the system, use of phasor measurements become common as well. There are many Phasor Measurement Unit (PMU) placement methods available in the literature for power system observability. Most of those methods aim to determine the measurement configuration (number of measurement devices and locations of those devices) with minimum cost such that most of the measurements in the resulting design are critical. Since errors associated with those measurements cannot be detected, a measurement configuration with many critical measurements is considered as a bad measurement configuration. Moreover, existing SCADA measurements are not considered by most of the existing methods in the literature. Since utilities have made considerable investments to the SCADA systems in the past, it is not a wise decision to ignore existing SCADA measurements in the system. In this thesis, it is aimed to develop a PMU placement algorithm for robust state estimation considering presence of conventional SCADA measurements. The PMU placement method places optimum number of PMUs to a known system in computer environment, such that specified measurement redundancy is obtained. The proposed method employs the SCADA measurements already available in the considered system, as well as generation – consumption information provided by the operator. Thus, the cost of the resulting measurement configuration is minimized. The proposed method, is also capable of evaluating PMUs with different current measurement channel number.
Citation Formats
B. Ertürk, “Optimal phasor measurement unit (PMU) placement for the power systems with existing SCADA measurements,” M.S. - Master of Science, Middle East Technical University, 2017.