scholarly journals ADN_Modelica: An Open Source Sequence-Phase Coupled Frame Program for Active Distribution Network Steady State Analysis

2016 ◽  
Author(s):  
Yuntao Ju ◽  
Fuchao Ge ◽  
Yi Lin ◽  
Jing Wang
Keyword(s):  
Steady State ◽  
Open Source ◽  
Short Circuit ◽  
Distribution Network ◽  
Load Flow ◽  
Renewable Energy Resources ◽  
Steady State Analysis ◽  
Active Distribution Network ◽  
Distributed Generators ◽  
State Analysis

Open source software such as OpenDSS has given a lot of help to distribution network researchers and educators. With high penetration of distributed renewable energy resources into distribution network, tradition distribution steady state analysis software such as OpenDSS is faced with difficulty in handling distributed generators. Three-phase distributed generators are often modeled in sequence frame while unbalanced distribution network are usually modeled in phase frame. So a load flow in sequence-phase coupled frame is proposed to handle models described in both frames. Voltage controlled DGs which are difficult to cope with in OpenDSS are handled in proposed program. The steady state analysis platform is programmed with open source Modelica language and the main aim of this paper is to introduce an open source platform for active distribution network steady analysis include load flow and short circuit analysis which can be easily adopted and improved by other educators and researchers.

scholarly journals A Unique Electrical Model for the Steady-State Analysis of a Multi-Energy System

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5753
Author(s):  
Danko Vidović ◽  
Elis Sutlović ◽  
Matislav Majstrović
Keyword(s):  
Steady State ◽  
Natural Gas ◽  
Energy System ◽  
Load Flow ◽  
Steady State Analysis ◽  
Gas Network ◽  
Natural Gas Network ◽  
Electrical Analogy ◽  
Unique Model ◽  
State Analysis

In order to decarbonize the energy sector, the interdependencies between the power and natural gas systems are going to be much stronger in the next period. Thus, it is necessary to have a powerful simulation model that is able to efficiently and simultaneously solve all coupled energy carriers in a single simulation environment in only one simulation step. As an answer to the described computational challenges, a unique model for the steady-state analysis of a multi-energy system (MES) using the electrical analogy approach is developed. Detailed electrical equivalent models, developed using the network port theory and the load flow method formulation, of the most important natural gas network elements, as well as of the linking facilities between the power and natural gas systems, are given. The presented models were loaded up into a well-known software for the power system simulation—NEPLAN. In the case studies, the accuracy of the presented models is confirmed by the comparison of the simulation results with the results obtained by SIMONE—a well-known software for natural gas network simulations. Moreover, the applicability of the presented unique model is demonstrated by the MES security of a supply analysis.

scholarly journals Convergence Evaluation of a Load Flow Method based on Cespedes' Approach to Distribution System Analysis

2016 ◽  
Vol 6 (6) ◽  
pp. 3276
Author(s):  
Diego Issicaba ◽  
Jorge Coelho
Keyword(s):  
Steady State ◽  
Convergence Rate ◽  
Numerical Simulations ◽  
Closed Form ◽  
Distribution System ◽  
System Analysis ◽  
Load Flow ◽  
Steady State Analysis ◽  
Flow Method ◽  
State Analysis

<p>This paper evaluates the convergence of a load flow method based on Cespedes' formulation to distribution system steady-state analysis. The method is described and the closed-form of its convergence rate is deduced. Furthermore, convergence dependence of loading and the consequences of choosing particular initial estimates are verified mathematically. All mathematical results have been tested in numerical simulations, some of them presented in the paper.</p>

scholarly journals Holomorphic Embedding Load Flow Modeling of the Three-phase Active Distribution Network

2018 ◽  
Author(s):  
Yuntao Ju
Keyword(s):  
Large Scale ◽  
Power Transmission ◽  
Distribution Network ◽  
Load Flow ◽  
Heavy Load ◽  
Active Distribution Network ◽  
Distributed Generators ◽  
Three Phase ◽  
Holomorphic Embedding ◽  
Flow Convergence

With large-scale distributed generators (DGs) in an active distribution network (ADN), conventional load flow convergence failure is incurred by heavy power transmission. The Holomorphic Embedding Load Flow Method (HELM) has proven to be more robust than the Newton&ndash;Raphson method under heavy power transmission. At present, HELM is mainly designed for balanced transmission networks. In this study, we developed a three-phase HELM model to accommodate DGs, delta connection loads, and ZIP loads for ADN. The effectiveness and better performance of the proposed method under heavy load situations were validated using modified unbalanced IEEE 13, 34, 37, and 123 test feeders.

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