Power Quality Indices

New Power Quality Indices

The author shows that the use of high-resolution spectrum estimation methods instead of Fourier-based techniques can improve the accuracy of measurement of spectral parameters of distorted waveforms encountered in power systems, in particular the estimation of the power quality indices (such as inter/harmonic groups and subgroups). The comparison of the frequency and amplitude estimation error,...

Power Quality and Voltage Sag Indices in Electrical Power Systems

In modern electrical power systems, electricity is produced at generating stations, transmitted through a high voltage network, and finally distributed to consumers. Due to the rapid increase in power demand, electric power systems have developed extensively during the 20th century, resulting in today’s power industry probably being the largest and most complex industry in the world. Electricit...

S-Transform Based Novel Indices for Power Quality Disturbances

Measurement of power quality indices using advanced spectrum estimation methods

Introduction The quality of voltage waveforms is nowadays an issue of the utmost importance for power utilities, electric energy consumers and also for the manufactures of electric and electronic equipment. The proliferation of nonlinear loads connected to contemporary power systems has triggered a growing concern with power quality issues. The inherent operation characteristics of these loads ...

Power Quality Indices for Unbalance Characterization in Non‐sinusoidal Condition

The unbalanced non-sinusoidal operation represents a common steady state of the modern distribution power grids. The unbalance is produced by supplying of unbalanced loads or by different unbalanced faults. According to the existing norms, this operating state is evaluated using the well-known negative and zero unbalance factors that practically keep out the harmonic pollution that coexists wit...