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The planning method of new energy distribution network in plateau area based on local accommodation

INTERNATIONAL JOURNAL OF EMERGING ELECTRIC power SYSTEMS 2025年第2期26卷 383-395页

作者： Wu, Wanjun Zhang, Min Mo, Changming Cao, Yi Chai, Shaobo Grid Co Yunnan Diqing Tibetan Aut Prefectural Power Supply Bur Yunnan 674499 Peoples R China Tianjin Tianda Qiushi Elect Power High Technol CO Tianjin 300392 Peoples R China Energy Dev Res Inst CSG Guangzhou 510700 Peoples R China

The planning method of new energy distribution network in plateau area based on local accommodation is studied to improve the local accommodation capacity of new energy distribution network in plateau area. The framework of new energy distribution network planning in the plateau area is constructed, and the distribution network equipment suitable for the plateau environment is selected based on the harsh environment in the plateau area;in the framework of new energy distribution network planning in plateau area, a bi-level planning model considering multi-flexible resource coordinated scheduling and energy storage is established. The upper level planning model takes the maximum accommodation of new energy as the objective, and the lower level planning model takes the optimal daily operation benefit of energy storage under the given configuration as the optimization objective;the probabilistic power flow method and C-PSO are used to solve the bi-level model. The experiment shows that this method ensures the stability of the new energy distribution network in the plateau area, reduces the amount of abandoned wind energy and the operating cost, and improves the local accommodation capacity of the core higher than the distribution network.

关键词： local accommodation plateau area new energy distribution network planning resource coordination and scheduling power flow algorithm

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A New AC Optimal power flow Formulation and Solution Using Genetic algorithm based on P-Q decomposition

A New AC Optimal Power Flow Formulation and Solution Using G...

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North American power Symposium (NAPS)

作者： Balasubramanian, Srinath Gokhale, Richa V. Sekar, Arun CompuSharp Inc Santa Clara CA USA Tennessee Technol Univ Dept Elect & Comp Engn Cookeville TN 38505 USA

ISBN: (纸本)9781467373890

This paper presents a new P-Q decomposition approach to solve the AC optimal power flow (OPF) problem. An alternative power flow model based on line flow equations (LFB) is used. In traditional power flow, the voltage magnitude and phase angle at each bus are treated as the independent variables. In the LFB model, the real and reactive power flows through the line along with the bus voltage magnitudes constitute the independent variables. The formulation is done by decoupling the OPF problem into active power and reactive power subproblems using line flow equations. Unlike traditional decomposition methods, the technique adopted in this approach does not ignore the weak coupling between the subjacobians. Taking a pragmatic point of view and eschewing complicated mathematical algorithms, the paper presents a solution procedure using Genetic algorithm methodology. Following a detailed description of the steps in the new approach, test results from an implementation of the proposed algorithm on a bench mark test system are presented. The results demonstrate the usefulness of this approach for achieving a practically acceptable solution to the AC OPF problem.

关键词： optimal power flow P-Q decomposition power flow algorithm line flow based model

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Newton-Downhill algorithm for Distribution power flow Analysis

Newton-Downhill Algorithm for Distribution Power Flow Analys...

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2nd International power and Energy Conference (PECon 2008)

作者： Yang, Hui Wen, Fushuan Wang, Liping Singh, S. N. S China Univ Technol Dept Elect Engn Guangzhou Guangdong Peoples R China Indian Inst Technol Kanpur Dept Elect Engn Kanpur Uttar Pradesh India

ISBN: (纸本)9781424424047

Newton-Raphson Method is a widely used power flow method for the load flow analysis, but for the particular topology structure of the radial power distribution network, it may fail converge or use lots of time for calculating due to the special nature of distribution system. In this paper, an ameliorative method of Newton-Raphson is presented, which is based on Down-hill Method. An approximate linear solution is used for an iterative initial value, in order to improve the time of Newton-Raphson Method. The effectiveness of the proposed algorithm has been tested on 126-bus distribution network and results are compared with other power flow methods.

关键词： Approximate linear solution Distribution system Down-hill Method Electricity market power flow algorithm

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An Efficient Backward/Forward Sweep algorithm for power flow Analysis through a Novel Tree-Like Structure for Unbalanced Distribution Networks

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ENERGIES 2021年第4期14卷 897-897页

作者： Petridis, Stefanos Blanas, Orestis Rakopoulos, Dimitrios Stergiopoulos, Fotis Nikolopoulos, Nikos Voutetakis, Spyros Ctr Res & Technol Hellas Chem Proc & Energy Resources Inst 6th Km Charilaou Thermi Rd GR-57001 Thessaloniki Greece

The increase of distributed energy resources (DERs) in low voltage (LV) distribution networks requires the ability to perform an accurate power flow analysis (PFA) in unbalanced systems. The characteristics of a well performing power flow algorithm are the production of accurate results, robustness and quick convergence. The current study proposes an improvement to an already used backward-forward sweep (BFS) power flow algorithm for unbalanced three-phase distribution networks. The proposed power flow algorithm can be implemented in large systems producing accurate results in a small amount of time using as little computational resources as possible. In this version of the algorithm, the network is represented in a tree-like structure, instead of an incidence matrix, avoiding the use of redundant computations and the storing of unnecessary data. An implementation of the method was developed in Python programming language and tested for 3 IEEE feeder test cases (the 4 bus feeder, the 13 bus feeder and the European Low Voltage test feeder), ranging from a low (4) to a very high (907) buses number, while including a wide variety of components witnessed in LV distribution networks.

关键词： power flow algorithm data structures breadth first search tree-like structure backward forward sweep runtime distribution network radial network

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A New AC Optimal power flow Formulation and Solution Using Genetic algorithm based on P-Q decomposition

A New AC Optimal Power Flow Formulation and Solution Using G...

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North American power Symposium

作者： Srinath Balasubramanian Richa V. Gokhale Arun Sekar CompuSharp Inc. Department of Electrical & Computer Engineering Tennessee Technological University

ISBN: (纸本)9781467373906

关键词： Optimal power flow P-Q decomposition power flow algorithm Line flow based model

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Development of three-phase unbalanced power flow using local control of connected photovoltaic systems

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IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 2020年第6期15卷 833-843页

作者： Chanhome, Anuwat Chaitusaney, Surachai Chulalongkorn Univ Fac Engn Dept Elect Engn Smart Grid Res Unit Bangkok 10330 Thailand

With the increased number of installations of distributed photovoltaic (PV) systems within electricity distribution systems, power flow analysis is required to handle multiple PV systems. At present, PV systems are equipped with a local control function (LCF). The conventional algorithm is then applied for power flow analysis with the LCF of each PV system, where the power output of LCF of each PV system is calculated and used in the power flow calculation. The conventional algorithm is terminated when the voltage at each iteration of the power flow algorithm is converged. However, the conventional algorithm inevitably requires a lengthy calculation. This paper proposes a power flow algorithm that applies the Newton-Raphson technique to handle multiple PV systems with an LCF for a faster calculation. The LCF is approximated to have a continuous characteristic. The developed power flow algorithm can be used for a three-phase unbalanced distribution system and its effectiveness was demonstrated in a modified 19-node distribution system. (c) 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

关键词： local control function power flow algorithm PV system three-phase unbalanced distribution system

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Novel approach to reconfiguration power loss reduction problem by simulated annealing technique

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INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS 2017年第12期27卷 n/a-N.PAG页

作者： Stojanovic, Branko Rajic, Tomislav Tech Testing Ctr Belgrade Serbia Univ Belgrade Sch Elect Engn Belgrade Serbia

The network reconfiguration is done by changing the status of the switches, mainly for 2 reasons: an active power loss reduction and load balancing attracting the attention of distribution engineers for quite a long period of time. In this article, solving method for the active power loss reduction is given. Searching for the relevant radial configurations is done by a simulated annealing technique. To aid the search, a program for checking the connectivity of the power system, with imposed radiality constraint, is enhanced by a new approximate power flow method. The applied power flow program is very efficient and fast but can be used only as an indication for the loss estimation because of the insufficient method accuracy. At the end of the algorithm, it is necessary to run an efficient power flow program to determine the real situation concerning loss reduction. A numerical example for Baran and Wu network is analyzed. The developed method converges to the global optimum given in a numerical example. The time duration of the used method is of an hour order and does not depend on the fast manipulation of incoming data files. This advantage makes the method interesting in the planning stage as well as the application in real time. Main contribution of this paper is a novel approach that exploits mostly the following mechanisms: network connectivity checking matrix, Lavorato et al criterion for imposing radiality constraint, and efficient power flow algorithm combined with precise power flow for exact loss calculation.

关键词： active power loss connectivity network configuration power flow algorithm radial configuration simulated annealing

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Determining maximum regulating capability of UPFC based on predicting feasibility limit of power systems

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ELECTRIC MACHINES AND power SYSTEMS 1998年第8期26卷 789-800页

作者： Liu, JY Song, YH Brunel Univ Dept Elect Engn & Elect Uxbridge UB8 3PH Middx England

This paper presents a novel procedure to determine the maximum regulating capability of a unified power flow controller (UPFC) by using optimal multiplier power flow. The capabilities of flexible ac transmission systems (FACTS) equipment are not only constrained by their thermal limits and the steady-state security limits, but also limited by their feasibility limits. After the detailed analyses have been made on the use of optimal multiplier mu as a new predictor to estimate the boundary point of the feasibility region, an algorithm for determining the UPFC regulating capability is proposed. The approach is then compared with minimum singular value decomposition on the IEEE 30 bus system. The results clearly demonstrate the effectiveness of the proposed approach.

关键词： flexible AC transmission systems (FACTS) power flow algorithm singular value decomposition (SVD) unified power flow controller (UPFC)

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power Management in DC Microgrid Based on Distributed Energy Sources' Available Virtual Generation 2

Power Management in DC Microgrid Based on Distributed Energy...

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2nd IEEE International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (IEEE ICAECT)

作者： Kumar, Avula Rohit Gupta, Vikas Saxena, D. Malaviya Natl Inst Technol Elect Engn Dept Jaipur Rajasthan India

ISBN: (纸本)9781665411202

A power algorithm strategy is presented along with a DC microgrid model with Distributed Energy Resources (DERs) with PV source, Wind source and Energy Storage System ( ESS). By utilizing the source power to its maximum capabilities, this power flow approach aids in overcoming power sharing among DERs and DC bus voltage regulation. The power algorithm uses virtual generation, which is defined by the extra power of the source beyond the average power rating. This virtual generation is used to generate a reference value. The virtual generation from each source is determined by the power supply available to the source. The proposed control algorithm strategy improves the lifespan of ESS by reducing its charging/ discharging cycles. This also reduces the stress on the interfacing converters and DC bus voltage regulation. The proposed control algorithm and microgrid model are implemented in MATLAB simulation.

关键词： DC microgrid PV wind energy storage system virtual generation power flow algorithm

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Impacts of Distributed PV in a Smart Grid using Temperature-Dependent power flow 7

Impacts of Distributed PV in a Smart Grid using Temperature-...

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7th IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia)

作者： Ahmed, Arif McFadden, Fiona Stevens Rayudu, Ramesh Victoria Univ Wellington Robinson Res Inst Wellington 6140 New Zealand Victoria Univ Wellington Smart Power & Renewable Energy Syst Grp Wellington 6140 New Zealand Victoria Univ Wellington Sch Engn & Comp Sci Wellington 6140 New Zealand

ISBN: (纸本)9781538649503

power flow (PF) is the foundation of many power system analyses essential for power system studies. The evolution of modern smart networks with increasing levels of integrated Distributed Generation, communication infrastructure, automation and control, requires accurate power flow analysis. The conventional PF assumes the power network and equipment has constant impedances despite resistance being a strong function of temperature. This means that the subsequent analyses undertaken have an inherent temperature dependent error. This error could be reduced by using the Temperature-Dependent power flow (TDPF) algorithm which estimates the network branch temperatures and adjusts the network impedances and outputs the PF. In this paper, the TDPF is derived in rectangular form and utilised to investigate the network voltage, branch power loss, and branch temperatures with integrated distributed photovoltaic systems. Simulation performed on the IEEE 14-bus network shows convincing results and the benefit of using the TDPF technique.

关键词： Impact study of distributed generation Photovoltaic systems power flow algorithm Temperature-dependent power flow PV Integration

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