Improvement of backward/forward sweep power flow method by using modified breadth‐first search strategy

Alinjak, Tomislav; Pavić, Ivica; Stojkov, Marinko

doi:10.1049/iet-gtd.2016.0566

Cited by 31 publications

(11 citation statements)

References 20 publications

(16 reference statements)

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“…The references [24,25] propose a novel method to deal with energy minimization; and finally in the paper [26], wavelet decomposition combined with an adaptive neuro-fuzzy inference system is used for short-term wind power forecasting. In the reference [27], by using a modified breadth-first search strategy, the improvement of a backward/forward sweep load-flow approach is presented. The goal of the paper [28] is to specify the optimal grid switching condition of minimum losses, with the precondition of keeping the stable voltages on all buses.…”

Section: Literature Reviewmentioning

confidence: 99%

A comparative study on common power flow techniques in the power distribution system of the Tehran metro

Ghiasi

2018

Teh. glas. (Online)

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Overall, a power-flow study is a steady-state assessment whose goal is to specify the currents, voltages, and real and reactive flows in a power system under a given load conditions. This paper presents a comparison of common power flow techniques in the Tehran metro power distribution system at the presence of non-linear loads. Moreover, a modelling, simulation and analysis of this power distribution system is implemented with the Electrical Transient Analyser Program (ETAP) software. In this assessment, common power flow techniques including the Newton-Raphson (NR), Fast Decoupled (FD), and Accelerated Gauss-Seidel (AGS) techniques are provided and compared. The obtained results (total generation, loading, demand, system losses, and critical report of the power flow) are analysed. In this paper, we focus on the detailed assessment and monitoring by using the most modern ETAP software, which performs numerical calculations of a large integrated power system with fabulous speed and also generates output reports. The capability and effectiveness of the power flow analysis are demonstrated according to the simulation results obtained with ETAP by applying it to the power distribution system of the Tehran metro. In developing countries such as Iran, off-line modelling and simulation of power grids by a powerful software are beneficial and helpful for the best usage of the electrical energy.

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Section: Literature Reviewmentioning

confidence: 99%

A comparative study on common power flow techniques in the power distribution system of the Tehran metro

Ghiasi

2018

Teh. glas. (Online)

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“…In the k-th (k≥0) iteration of the conventional NR method, x (k) = [δ (k) U (k) ω (k) ] T is given (k=0) or obtained from last iteration (k>0); f (k) (x (k) ) = [ΔP (k) (x (k) ) ΔQ (k) (x (k) )] T and J (k) can be calculated from (7) and (17) respectively. Then the step size Δx (k) can be determined by: (19) After the step Δx (k) is obtained, x is updated:…”

Section: Problem Formulation For Unbalanced Imgsmentioning

confidence: 99%

“…Extensive studies have been carried out on load flow calculation for transmission and distribution systems [6][7][8]. However, conventional load flow models and algorithms are not applicable to droop-controlled IMGs because of their following features: 1) These IMGs are typically fed by several droop-controlled DG units of small capacity, thus no DG unit can serve as a slack bus, and the system frequency is not constant anymore; 2) The active and reactive power output as well as the voltage of the droop-controlled DGs are determined based on the droop characteristics, thus none of them can be pre-specified [3][4].…”

Section: Introductionmentioning

confidence: 99%

Load flow calculation for droop‐controlled islanded microgrids based on direct Newton–Raphson method with step size optimisation

Zhang

Wu²,

Ding

et al. 2020

IET Generation, Transmission & Distribution

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Load flow calculation for droop-controlled islanded microgrids (IMGs) is different from that of transmission or distribution systems due to the absence of slack bus and the variation of frequency. Meanwhile considering the common three-phase imbalance condition in low-voltage systems, a load flow algorithm based on direct Newton-Raphson (NR) method with step size optimization for both three-phase balanced and unbalanced droop-controlled IMGs is proposed in this paper. First, the steady-state models for balanced and unbalanced droop-controlled IMGs are established based on their operational mechanisms. Then taking frequency as one of the unknowns, the nonlinear load flow equations are solved iteratively by NR method. Generally, iterative load flow algorithms are faced with challenges of convergence performance, especially for unbalanced systems. To tackle this problem, a step-size-optimization scheme is employed to improve the convergence performance for three-phase unbalanced IMGs. In each iteration, a multiplier is deduced from the sum of higherorder terms of Taylor expansion of the load flow equations. Then the step size is optimized by the multiplier which can help smooth the iterative process and obtain the solutions. The proposed method is performed on several balanced and unbalanced IMGs. Numerical results demonstrate the correctness and effectiveness of the proposed algorithm.

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“…Alinjak et al . [150, 151] developed a three‐phase power flow method for unbalanced LV networks aimed at minimising the network losses. The system element modelled in three‐phase frameworks based on the FBS technique.…”

Section: Operation Of LV Distribution Networkmentioning

confidence: 99%

Planning and operation of LV distribution networks: a comprehensive review

Al-Ja’Afreh

Mokryani

2019

IET Energy Systems Integration

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The low‐voltage (LV) distribution network is the last stage of the power network, which is connected directly to the end‐user customers and supplies many dispersed small‐scale loads. To achieve environmental targets and to address the energy shortage issue, governments worldwide increase the renewable energy sources (RESs) into the electricity grid. In addition, different types of low carbon technologies (LCTs) such as electric vehicles are becoming widely used. A significant portion of RES and LCTs is penetrated into the LV distribution network, which poses a wide range of challenges. To address these challenges, there is a persistent need to develop traditional planning and operation frameworks to cope with these new technologies. In this context, this study provides a comprehensive review of planning, operation, and management of LV distribution networks. The characteristics, types, and topologies of LV distribution networks plus different aspects of operation and planning are investigated. An insightful investigation of the reasons impacts and mitigation of voltage and current unbalanced in LV networks is provided. Moreover, the main three‐phase power flow techniques used to analyse the LV networks are analysed.

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Improvement of backward/forward sweep power flow method by using modified breadth‐first search strategy

Cited by 31 publications

References 20 publications

A comparative study on common power flow techniques in the power distribution system of the Tehran metro

A comparative study on common power flow techniques in the power distribution system of the Tehran metro

Load flow calculation for droop‐controlled islanded microgrids based on direct Newton–Raphson method with step size optimisation

Planning and operation of LV distribution networks: a comprehensive review

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