Browsing by Author "Lopez-Ramirez, Izar"
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Item Assessment on power systems non-deterministic state estimation algorithms(2023-01-01) Lopez-Ramirez, Izar; Rodriguez-Seco, J. Emilio; Zamora, Inmaculada; POWER SYSTEMSPower systems are operated in a deterministic way. However, the increase in uncertainties (caused by measurement and communication errors or the absence of complete knowledge of the measured quantity) requires algorithms capable of assessing randomness in real-time monitoring and operation of energy management systems. Among them, state estimation is a fundamental element that provides complete and reliable information about the current network state. This paper offers a review of non-deterministic algorithms, used to assess the randomness caused by the uncertainties in power system state estimation. Depending on the uncertainty modeling method, different static and dynamic non-deterministic state estimation algorithms for transmission and distribution systems are reviewed. Also, four of the most relevant algorithms are implemented and results are compared for distribution networks. The relevance of such models, as well as their motivation, are addressed.Item LINEAR STATE ESTIMATION IN DISTRIBUTION SYSTEMS USING SMART METER DATA(2023) Lopez-Ramirez, Izar; Zamora, Inmaculada; Piyasinghe, Lakshan P.; Rodriguez-Seco, J. Emilio; POWER SYSTEMS; Tecnalia Research & InnovationThe new generation of smart meters can provide valuable information. “New generation” smart meters provide voltage magnitude and apparent power measurements. In addition, voltage angle measurements referenced to the substation can be added. The aim of this paper is to formulate a state estimation algorithm for power distribution system, using apparent power, voltage angle and voltage magnitude measurements at low voltage residential customers. The research is focused on the American distribution system, which ranges from medium-voltage substations to low-voltage consumers. The objective is to determine the state of a distribution network, using only measurements provided by smart meters. Simulations performed on an EPRI test network section show that the voltages in MV can be estimated from smart meter measurements.