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Open AccessArticle

State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks

by 1,2,*,†, 2 and 1
1
Efacec Automation, Grid Management Division, 4471-907 Porto, Portugal
2
Faculty of Engineering (FEUP), University of Porto, 4200-465 Porto, Portugal
*
Author to whom correspondence should be addressed.
Current address: Via de Francisco Sá Carneiro Apartado 3078, 4471-907 Moreira da Maia, Porto, Portugal.
Energies 2020, 13(18), 4932; https://doi.org/10.3390/en13184932
Received: 18 July 2020 / Revised: 14 September 2020 / Accepted: 18 September 2020 / Published: 20 September 2020
(This article belongs to the Special Issue Hybrid AC/DC Transmission Grids)
As the integration of High Voltage Direct Current (HVDC) systems on modern power networks continues to expand, challenges have appeared in different fields of the network architecture. In the Supervisory, Control and Data Acquisition (SCADA) field, software and toolboxes are expected to be modified to meet the new network characteristics. Therefore, this paper presents a unified Weighted Least Squares (WLS) state estimation algorithm suitable for hybrid HVDC/AC transmission systems, based on Voltage Source Converter (VSC). The mathematical formulas of the unified approach are derived for modelling the AC, DC and converter coupling components. The method couples the AC and DC sides of the converter through power and voltage constraints and measurement functions. Two hybrid power system test cases have been studied to validate this work, a 4-AC/4-DC/4-AC network and Cigre B4 DC test case network. Furthermore, comparison between the fully decentralized state estimation and the unified method is provided, which indicated an accuracy improvement and error reduction. View Full-Text
Keywords: state estimation; WLS; unified; HVDC/AC; AC/DC; transmission; hybrid; distributed; decentralized; VSC; HVDC state estimation; WLS; unified; HVDC/AC; AC/DC; transmission; hybrid; distributed; decentralized; VSC; HVDC
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MDPI and ACS Style

Ayiad, M.; Leite, H.; Martins, H. State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks. Energies 2020, 13, 4932. https://doi.org/10.3390/en13184932

AMA Style

Ayiad M, Leite H, Martins H. State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks. Energies. 2020; 13(18):4932. https://doi.org/10.3390/en13184932

Chicago/Turabian Style

Ayiad, Motaz; Leite, Helder; Martins, Hugo. 2020. "State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks" Energies 13, no. 18: 4932. https://doi.org/10.3390/en13184932

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