An Analytical Framework for Power Quality Monitoring in Enterprise-level Power Grid




Ali, Sardar

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Due to the high measuring cost, the monitoring of power quality is non-trivial. This work is aimed at reducing the cost of power quality monitoring in power networks. Using a real-world power quality dataset, this work adopts a learn-from-data approach to obtain a device latent feature model, which captures the device behavior as a power quality transition function. With the latent feature model, the power network could be modeled, in analogy, as a data-driven network, which presents the opportunity to use the well-investigated network monitoring and data estimation algorithms to solve the network quality monitoring problem in power grid. Based on this network model, algorithms are proposed to: 1) intelligently place measurement devices on suitable power links to reduce the uncertainty of power quality estimation on unmonitored power links, 2) estimate the power quality in unmonitored segments of a power network, using only a small number of measurement points, and 3) identify a potential malfunction device in the network. The meter placement algorithms use entropy-based measurements and Bayesian network models to identify the most suitable power links for power quality meter placement. Evaluation results on various simulated networks including IEEE distribution test feeder system show that the meter placement solution is efficient, and has the potential to significantly reduce the uncertainty of power quality values on unmonitored power links. After deploying power quality meters on selected links, a MaxEnt-based approach is presented to estimate the power quality on the unmonitored lines. Compared to other existing methods such as MCEM, the MaxEnt-based approach is much faster while maintaining similar estimation accuracy. Convergence time of the MaxEnt algorithm is particularly important when the network size increases and we need to do the estimation in real time. Finally, using readings from our metered locations, we propose a prediction model that derives an acceptable device behavior to identify a potential malfunction device in the power grid. Simulation results show that our predictive model accurately detects the malfunction devices in the power network and can be used to make proper recommendations of device maintenance and replacement.



Power quality, Network, Algorithms, MaxEnt