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Techno-economic potential gains of electric springs in distribution networks operations

IET GENERATION TRANSMISSION & DISTRIBUTION 2020年第1期14卷 98-107页

作者： Askarpour, Mohammad Aghaei, Jamshid Boudjadar, Jalil Niknam, Taher Shiraz Univ Technol Elect & Elect Engn Dept Shiraz Iran Aarhus Univ Dept Elect Engn Aarhus Denmark

The electric spring (ES) is a reactive compensator which is series with a noncritical load. This paper utilizes the ES in the distribution networks and examines the underlying performance operationally and economically. A virtual generator model for the electric spring is proposed to ease the study of power systems. An algorithm based on the backward/forward sweep method is proposed for solving the optimal power flow. Then, with a 24-hour real price and load data of ISO-NE market, the performance of ES is evaluated operationally and economically in two distribution systems. The ESs may exchange reactive power between each other and this raises active and reactive power losses. To cope this problem, the feeders' voltages of the middle load demand are set as the reference voltages of ESs in each feeder so, each ES has a different reference voltage to cease the ES power exchanges. In this work, indexes such as voltage profile, active power loss, reactive power loss, power factor, electric bill payment, net present value, internal rate of return and the payback year are measured. The results of case study confirm the ES improves power loss, voltage profile, power factor, and stability while it reduces the operation cost.

关键词： distributed power generation load flow power markets pricing busbars power factor correction distribution networks reactive power different reference voltage ES power exchanges active power loss reactive power loss power loss reduction voltage profile improvement power factor correction techno-economic potential gains electric spring distribution networks operations noncritical load critical load voltage busbar voltage examines virtual generator model power systems original loads power flow algorithm optimal power flow load data IEEE 33-bus distribution test feeder feeders middle load demand reference voltages

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Calculation of remote effects of stray currents on rail voltages in DC railways systems

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IET ELECTRICAL SYSTEMS IN TRANSPORTATION 2013年第2期3卷 31-40页

作者： Valero Rodriguez, Jorge Sanz Feito, Javier Univ Carlos III Madrid Dept Elect Engn Av Univ 30 Leganes 28911 Madrid Spain

This study focuses on the analysis of the remote effects of stray currents and rail potentials along the rail line in DC traction systems, although the results can be extrapolated to AC systems. This study is essential to ensure the equipment and passenger safety, as well as the maintenance of rail infrastructures, subjected to corrosion in DC railway traction systems. The mathematical model developed in this study allows to obtain stray current and rail voltage distributions at the point where the train or the short circuit is located, x, and what is more important, it lets also to calculate its remote effects at any other point along the rail, y. Most of the railway electric models published in the literature do not calculate the remote effects of stray currents and rail potentials. Calculations are often done just at the specific point where the current is injected into the rail. However, the train and short-circuit currents actually generate remote effects as a voltage wave-front that propagates along the rails. Another contribution of this article is that the problem is defined as a function of the power demanded by the vehicle at each point, P(x), so the consumed current, I(x), is obtained by means of a power flow algorithm. Nevertheless the vast majority of references assume an already known input current, which, may only be obtained by power flow methods. With the aim of simplifying the lecture of this document, Table 1 provides the list of symbols used in this study.

关键词： railway electrification short-circuit currents traction power flow algorithm current consumption power flow algorithm voltage wave-front short-circuit currents railway electric models rail voltage distributions mathematical model DC railway traction systems rail infrastructure maintenance passenger safety AC systems rail line rail potentials rail voltages stray currents remote effects

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Toward Zero-Net bidirectional power transfer in Low-Voltage smart microgrids

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY SYSTEMS 2024年 159卷

作者： Salem, Qusay Xie, Jian Princess Sumaya Univ Technol Dept Elect Engn Amman Jordan Ulm Univ Inst Energy Convers & Storage Ulm Germany

This paper presents a new approach for controlling the bidirectional active power flow using a series voltage source inverter placed in between the microgrid and the main grid in LV distribution network. Implementing the control operation of the series VSI resembles the form of a simulation-based optimization where a novel overall power flow algorithm is implemented to investigate the system behavior. This algorithm considers controlling the active power of the series VSI and the active power between the main grid and the microgrid to zero net energy. The algorithm has three nested levels working together to satisfy an active power reference at PCC. The results revealed in this paper are (1) investigating different settings for the DG droop characteristics to determine the limits of the proposed approach and (2) regulating the magnitude and phase angle of the series VSI according to a desired active power reference at PCC. The obtained results confirm the effectiveness and feasibility of the proposed approach and the capability of the overall power flow algorithm in satisfying the zero-net power transfer target.

关键词： Simulation based optimization power flow algorithm Smart Microgrid P-U droop Distributed Generator

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Steady-state model of multi-port electric energy router and power flow analysis method of AC/DC hybrid system considering control strategies

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JOURNAL OF ENGINEERING-JOE 2019年第16期2019卷 2794-2799页

作者： Shen, Yu Zhu, Fengju Zhang, Chunpeng Cai, Weiqian Yuan, Liqiang Li, Kai Zhao, Zhengming Tsinghua Univ State Key Lab Control & Simulat Power Syst & Gene Dept Elect Engn Beijing 100084 Peoples R China

This study proposes a steady-state model of multi-port electric energy router (EER) and a power flow analysis method for AC/DC hybrid system considering control strategies. Firstly, a circuit topology model of EER is put forward, including AC and DC port equivalent parts. Secondly, considering external control characteristics of EER, the control strategies including PQ mode, V/f mode, and droop mode are established, which is suitable for system analysis. Then, using the extended sub-network model, an AC/DC power flow model containing multi-port EER is established. In terms of the power flow algorithm for AC/DC hybrid system, AC/DC network admittance matrix and the extended AC/DC network modification equations are applied to solve the problem. Two examples are designed and show that EER can be used for flexible power regulation and voltage improvement. Besides, power flow analysis method of AC/DC hybrid system is demonstrated to be effective.

关键词： network topology load flow distributed power generation distribution networks steady-state model multiport electric energy router power flow analysis method AC DC hybrid system control strategies circuit topology model system analysis extended sub-network model AC DC power flow model multiport EER power flow algorithm AC DC network admittance matrix extended AC DC network modification equations

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Graph Computation and Its Applications in Smart Grid 6

Graph Computation and Its Applications in Smart Grid

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IEEE 6th International Congress on Big Data (BigData Congress)

作者： Liu, Guangyi Liu, Kewen Shi, Di Zhu, Wendong Wang, Zhiwei Chen, Xi GEIRI North Amer Inc Santa Clara CA 95054 USA GEIRI Beijing 100192 Peoples R China

ISBN: (纸本)9781538619964

Smart grid is an important platform for the exploitation of renewable energy resources and maintaining/improving the reliability of power grid. Challenges have been identified during the construction of smart grid, which calls for novel simulation, computation and data management technologies. For example, as the size of power systems continue to increase, new computational tools are needed to co-simulate the transmission and distribution networks;new data processing and analytical technologies are required to handle big data in power systems;new database technologies are required to manage huge amounts of equipment, etc. To handle these challenges, a graph computation based framework is proposed. Initial investigation of this framework shows that graph computation is a promising technology for solving many of the challenges that arise during the development of smart grid.

关键词： Graph data model Graph computation Big data analytics power flow algorithm Smart grid

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Integration of Induction Generator Based Distributed Generation and Shunt Compensation Capacitors in power Distribution Networks

Integration of Induction Generator Based Distributed Generat...

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International Conference on power Engineering, Energy and Electrical Drives

作者： I. Musa B. Zahawi S. M. Gadoue School of Electrical and Electronic Engineering Newcastle University Newcastle upon Tyne NE1 7RU England United Kingdom

ISBN: (纸本)9781467363914

An algorithm for computing the reactive power requirement of induction generator based distributed generation is proposed in this paper. The machine equivalent circuit is combined with an AC power flow algorithm and particle swarm optimization (PSO), for simultaneous integration of induction generation and shunt compensation capacitors in a power distribution network with the objective of minimizing network power loss. The algorithm iteratively calculates the required slip for the output power of the generator to be within a small tolerance band of the specified output power. PSO is then employed to obtain the global optimal solution with the compensation capacitors locally providing the reactive power requirement of the generator. The algorithm is tested on a standard 33-bus distribution network, showing its effectiveness for the integration of induction machine based generation.

关键词： Distributed Generation Induction Generator Particle Swarm Optimization power flow algorithm Shunt compensation

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Steady state analysis of Multiport Interline DC Current flow Controller integrated meshed MTDC grids

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ELECTRIC power SYSTEMS RESEARCH 2024年 232卷

作者： Vallinayagam, A. S. Anbuselvi, S., V Devi, Kumudini Bellmunt, Oriol Gomis Anna Univ Sardar Patel Rd Chennai 600025 Tamilnadu India UPC CITCEA Av Diagonal 647Pavill G Barcelona 08028 Spain

Flexible DC Transmission Systems (FDCTS) devices offer the most promising solution for power flow Management (PFM) problem in complex meshed MTDC grids. This paper proposes a new formulation for steady state analysis of a MTDC grid, integrated with the multiport version of the FDCTS device called Multiport Interline DC Current flow Controller (MIDCCFC). MIDCCFC can regulate the current flow of two or more lines, thereby achieving line power flow regulation and aid for DC line breaking in a MTDC system. The proposed formulation integrates the steady state operating point of MIDCCFC with the MTDC system. The proposed formulation is tested on a 5 bus 320 kV meshed MTDC grid with 5-port MIDCCFC. A criterion is evolved to ensure the feasibility of the operating point obtained from the proposed formulation. The line current regulation range offered by MIDCCFC for line-12 in the test system is (30-3086) A. The impact of line-12 current variation on the system variables over the obtained range is investigated. The application of MIDCCFC for DC breaking is also investigated. The results are validated by performing steady state simulation of the test system in MATLAB/Simulink and real time simulation of the test system in Real Time Digital Simulator.

关键词： FDCTS devices Series interline current control Current flow Controller (CFC) power flow algorithm Multiport CFC Multiport Interline DC Current flow Controller (MIDCCFC)

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