Propriedades estatísticas dos sinais de PMU - Phasor Measurement Unit

Abstract

This master’s thesis studies the statistical properties of voltage, current, and complex power measurements provided by phasor measurement units (PMUs). We use PMU measurements installed in an extra-high voltage transmission system, specifically the network operated by Companhia de Transmissão de Energia Elétrica Paulista (CTEEP), a transmission system operator in Brazil. Further, we also conduct an analysis using PMU measurements installed in low-voltage distribution systems, notably PMUs installed on University campuses across Brazil funded by the MedFasee project. Our analysis relies on the methodology recommended by the technical literature in signal processing. We pay particular attention to the fact that the standard deviation of errors associated with measurements expressed in rectangular coordinates decisively impacts the performance of bad-data processing algorithms. Hence, we evaluate the performance of bad-data processing algorithms formulated in the complex plane. We perform this evaluation on two state estimators based on the weighted least squares (WLS) method. The first state estimator follows the classical formulation and only uses measurements from the supervisory control and data acquisition (SCADA) system. The second state estimator relies on a hybrid formulation, which allows us to use SCADA and PMU measurements.