Distribution systems state estimation for distributed generation re-synchronization

Authors

  • Franky Aldemar Bermúdez-Calderón National University of Colombia
  • Hernando Díaz-Morales National University of Colombia
  • Eduardo Alirio Mojica-Nava National University of Colombia https://orcid.org/0000-0002-3259-4013

DOI:

https://doi.org/10.17533/udea.redin.n85a05

Keywords:

Distribution system state estimation, Phasor measurement units, Observability analysis, Distributed generation, Re-synchronization, Self-healing, Pseudo-measurements, Microgrids

Abstract


This paper presents an application of a state estimation algorithm as a tool for re-synchronization of distributed generation in a distribution system. The estimation results can be used to operate a distributed generation in grid and off-grid mode. The estimated state variables are utilized as input data to control a Diesel generator while resynchronizing as well as for a grid mode loss predictor. The proposed state estimator, with branch currents as state variables, was solved by the weighted least squares method using singular value decomposition. To ensure the observability of the distribution system, a detailed numerical observability analysis was carried out with complex power measurements and unconventional branch current phasor measurements. In the algorithm, phasor measurement units and pseudo-measurements can be incorporated. Conditions that ensure system observability and redundancy increasing are derived when those measurements are included. The approach was tested in the IEEE 13 node test feeder, to which a distributed generation was connected for external network feeding. The algorithm shows stability, convergence, allowing the distributed generation re-synchronization to the distribution system. This feature could help improve self-healing capability in microgrids that use synchronous generators.

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Author Biographies

Franky Aldemar Bermúdez-Calderón, National University of Colombia

Department of Electrical and Electronic Engineering, Faculty of Engineering.

Hernando Díaz-Morales, National University of Colombia

Department of Electrical and Electronic Engineering, Faculty of Engineering.

Eduardo Alirio Mojica-Nava, National University of Colombia

Department of Electrical and Electronic Engineering, Faculty of Engineering. Professor.

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Published

2017-12-07

How to Cite

Bermúdez-Calderón, F. A., Díaz-Morales, H., & Mojica-Nava, E. A. (2017). Distribution systems state estimation for distributed generation re-synchronization. Revista Facultad De Ingeniería Universidad De Antioquia, (85), 40–52. https://doi.org/10.17533/udea.redin.n85a05