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Content Provider | IET Digital Library |
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Author | Lou, Chengwei Yang, Jin Li, Tianrui Fuentes, Eduardo Vega |
Abstract | Three-phase unbalanced conditions in distribution networks are conventionally caused by load imbalance, asymmetrical fault conditions of transformers and impedances of three phases. The uneven integration of single-phase distributed generation (DG) worsens the imbalance situation. These unbalanced conditions result in financial losses, inefficient utilisation of assets and security risks to the network infrastructure. In this study, a phase-changing soft open point (PC-SOP) is proposed as a new way of connecting soft open points (SOPs) to balance the power flows among three phases by controlling active power and reactive power. Then an operational strategy based on PC-SOPs is presented for three-phase four-wire unbalanced systems. By optimising the regulation of SOPs, optimal energy storage systems dispatch and DG curtailment, the proposed strategy can reduce power losses and three-phase imbalance. Second-order cone programming (SOCP) relaxation is utilised to convert the original non-convex and non-linear model into an SOCP model which can be solved efficiently by commercial solvers. Case studies are conducted on a modified IEEE 34-node three-phase four-wire system and the IEEE 123-node test feeder to verify the effectiveness, efficiency and scalability of the proposed PC-SOP concept and its operational strategy. |
Starting Page | 5685 |
Ending Page | 5696 |
Page Count | 12 |
ISSN | 17518687 |
Volume Number | 14 |
e-ISSN | 17518695 |
Issue Number | Issue 23, Dec (2020) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-gtd/14/23 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.1660 |
Journal | IET Generation, Transmission & Distribution |
Publisher | The Institution of Engineering and Technology |
Publisher Date | 2020-10-01 |
Access Restriction | Open |
Rights License | Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) |
Subject Keyword | Active Power Asymmetrical Fault Condition Concave Programming Control of Electric Power System Demand Side Management DG Curtailment Distribution Network Energy Storage Financial Loss Four-wire System Four-wire Unbalanced System Imbalance Situation Inefficient Utilisation Load Flow Load Imbalance Network Infrastructure New Phase-changing Soft Open Point Operational Strategy Optimal Energy Storage System Dispatch Optimisation Technique PC-SOP Concept Power Distribution Control Power Distribution Economics Power Distribution Fault Power Loss Power System Control Power System Economics Power System Managemen Power System Operation Power System Protection Power System Security Reactive Power Reactive Power Control Second-order Cone Programming Relaxation Security Risks Single-phase Distributed Generation Soft Open Point SOPs Three-phase Imbalance Three-phase Unbalanced Condition Transformer Unbalanced Power Distribution Network Uneven Integration |
Content Type | Text |
Resource Type | Article |
Subject | Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering |
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