scholarly journals HELMpy, Open Source Package of Power Flow Solvers, Including the Holomorphic Embedding Load Flow Method (HELM), Developed on Python 3

2021 ◽  
Vol 9 ◽  
Author(s):  
Tulio Molina ◽  
Juan Ortega ◽  
Juan Muñoz
Keyword(s):  
Open Source ◽  
Power Flow ◽  
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

scholarly journals A Novel Fast Hybrid Frequency Domain Approach for Evaluating Harmonic Power Flow in Electricity Networks

2021 ◽  
Vol 2070 (1) ◽  
pp. 012134
Author(s):  
D Krishna Praveen ◽  
ShaikHussain Vali ◽  
Vempalle Rafi
Keyword(s):  
Power System ◽  
Frequency Domain ◽  
Rural Areas ◽  
Power Flow ◽  
Load Flow ◽  
Green Energy ◽  
Flow Method ◽  
Hybrid Frequency ◽  
Frequency Domain Approach ◽  
Harmonic Power

Abstract Ideally, an AC power supply should constantly provide a perfectly sinusoidal voltage signal at every customer location. Nowadays, many power electronic equipment’s are used in industry in seeking higher system reliability and efficiency and more electronic or microprocessor controllers are used in power system to control AC/DC transmission lines or loads. Moreover, the importance of green energy such as wind and solar is continually growing in our societies not only due to environmental concerns but also to resolve the problem of access to electricity in rural areas. As a result of these issues, power quality problems especially generation of harmonics are on the rise in the distribution network. In electrical power system, harmonics have a number of undesirable effects on power system devices as well as on their operation. It therefore becomes imperative for power system engineers to analyse the penetration of harmonics from the various sources into the network which commonly is known as harmonic power flow evaluation. This paper proposed a novel fast hybrid frequency domain approach (FHA) to evaluate the steady state harmonic power flow with discrete harmonic frequency. The proposed method is applied to IEEE – 14 bus, IEEE New England 39 - bus, IEEE – 57 bus and IEEE 118 - bus power system respectively and compared with Newton – Raphson (NR) load flow method and Fast decoupled load flow method (FDLF) and the results validate the accuracy, robustness and authenticity of the proposed method.

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