HELM: The Holomorphic Embedding Load-Flow Method. Foundations and Implementations

2018 ◽  
Vol 3 (3-4) ◽  
pp. 140-370 ◽  
Author(s):  
Antonio Trias
Keyword(s):  
Load Flow ◽  
Flow Method ◽  
Holomorphic Embedding

scholarly journals Three-Phase Unbalanced Optimal Power Flow Using Holomorphic Embedding Load Flow Method

2019 ◽  
Vol 11 (6) ◽  
pp. 1774 ◽  
Author(s):  
Bharath Rao ◽  
Friederich Kupzog ◽  
Martin Kozek
Keyword(s):  
Power Flow ◽  
Optimal Power Flow ◽  
Low Voltage ◽  
Distribution Networks ◽  
Optimization Method ◽  
Load Flow ◽  
Flow Method ◽  
Optimal Power ◽  
Three Phase ◽  
Holomorphic Embedding

Distribution networks are typically unbalanced due to loads being unevenly distributed over the three phases and untransposed lines. Additionally, unbalance is further increased with high penetration of single-phased distributed generators. Load and optimal power flows, when applied to distribution networks, use models developed for transmission grids with limited modification. The performance of optimal power flow depends on external factors such as ambient temperature and irradiation, since they have strong influence on loads and distributed energy resources such as photo voltaic systems. To help mitigate the issues mentioned above, the authors present a novel class of optimal power flow algorithm which is applied to low-voltage distribution networks. It involves the use of a novel three-phase unbalanced holomorphic embedding load flow method in conjunction with a non-convex optimization method to obtain the optimal set-points based on a suitable objective function. This novel three-phase load flow method is benchmarked against the well-known power factory Newton-Raphson algorithm for various test networks. Mann-Whitney U test is performed for the voltage magnitude data generated by both methods and null hypothesis is accepted. A use case involving a real network in Austria and a method to generate optimal schedules for various controllable buses is provided.

Distributed slack bus model formulation for the holomorphic embedding load flow method

2020 ◽  
Vol 30 (3) ◽  
Author(s):  
Juan Ortega ◽  
Tulio Molina ◽  
Juan Carlos Muñoz ◽  
Sebastian Oliva H.
Keyword(s):  
Load Flow ◽  
Model Formulation ◽  
Flow Method ◽  
Holomorphic Embedding

scholarly journals Remote Voltage Control Using the Holomorphic Embedding Load Flow Method

2019 ◽  
Vol 10 (6) ◽  
pp. 6308-6319
Author(s):  
Chengxi Liu ◽  
Nan Qin ◽  
Kai Sun ◽  
Claus Leth Bak
Keyword(s):  
Voltage Control ◽  
Load Flow ◽  
Flow Method ◽  
Holomorphic Embedding
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