Flexibility Enhancement in an Islanded Distribution Power System by Online Demand-Side Management

The paper considers the possibilities of increasing the flexibility of power distribution systems by real-time load management. The principles of the implementation of special automatic systems for this purpose are proposed. These systems enable some loads of specific consumers of the power distribution system switched to islanded operation to “shift” from the daily maximum to the minimum, which makes some generators available to connect certain essential consumers disconnected earlier by under-frequency load shedding system to the power system. The approach under consideration is illustrated by a power system with distributed generation.

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Complete power distribution system representation and state determination for fault location

DYNA ◽

10.15446/dyna.v82n192.48589 ◽

2015 ◽

Vol 82 (192) ◽

pp. 141-149 ◽

Cited By ~ 1

Author(s):

Andres Felipe Panesso-Hernández ◽

Juan Mora-Flórez ◽

Sandra Pérez-Londoño

Keyword(s):

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Fault Location ◽

Estimation Error ◽

Distance Estimation ◽

Power Distribution Systems ◽

Line Load ◽

Power Distribution System ◽

Line Section

The impedance-based approaches for fault location in power distribution systems determine a faulted line section. Next, these require of the estimation of the voltages and currents at one or both section line ends to exactly determine the fault location. It is a challenge because in most of the power distribution systems, measurements are only available at the main substation. This document presents a modeling proposal of the power distribution system and an easy implementation method to estimate the voltages and currents at the faulted line section, using the measurements at the main substation, the line, load, transformer parameters and other serial and shunt connected devices and the power system topology. The approach here proposed is tested using a fault locator based on superimposed components, where the distance estimation error is lower than 1.5% in all of the cases.

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Active Reduction of Short-Circuit Current in Power Distribution Systems

Energies ◽

10.3390/en13020334 ◽

2020 ◽

Vol 13 (2) ◽

pp. 334

Author(s):

Esteban Pulido ◽

Luis Morán ◽

Felipe Villarroel ◽

José Silva

Keyword(s):

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Short Circuit ◽

Circuit Breaker ◽

Short Circuit Current ◽

Power Converter ◽

Power Distribution Systems ◽

Power Distribution System ◽

In Series

In this paper, a new concept of short-circuit current (SCC) reduction for power distribution systems is presented and analyzed. Conventional fault current limiters (FCLs) are connected in series with a circuit breaker (CB) that is required to limit the short-circuit current. Instead, the proposed scheme consisted of the parallel connection of a current-controlled power converter to the same bus intended to reduce the amplitude of the short-circuit current. This power converter was controlled to absorb a percentage of the short-circuit current from the bus to reduce the amplitude of the short-circuit current. The proposed active short-circuit current reduction scheme was implemented with a cascaded H-bridge power converter and tested by simulation in a 13.2 kV industrial power distribution system for three-phase faults, showing the effectiveness of the short-circuit current attenuation in reducing the maximum current requirement in all circuit breakers connected to the same bus. The paper also presents the design characteristics of the power converter and its associated control scheme.

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Shunt Petersen-Coil with Resistor for Single Phase Fault Detection in Resonant Grounded Power Distribution Systems

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.860-863.2007 ◽

2013 ◽

Vol 860-863 ◽

pp. 2007-2012 ◽

Cited By ~ 1

Author(s):

Xiao Meng ◽

Neng Ling Tai ◽

Yan Hu ◽

Xia Yang

Keyword(s):

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Single Phase ◽

Detection Sensitivity ◽

Power Distribution Systems ◽

Power Distribution System ◽

Multi Level ◽

The Difference ◽

Petersen Coil

The failure current in resonant grounder power distribution system is small, so it is difficult to detect the fault feeder. This passage presents the equivalent circuit of resonant grounded system, and discusses the difference of electrical characteristics between faulty feeder and sound feeders by using shunt resistors. To reduce the influence of shunt resistors on the system and improve the detection sensitivity, it presents the method of shunting multi-level resistors, and it proves the sensitivity and reliability of this method by EMTP simulation.

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An Encoding Technique for Multiobjective Evolutionary Algorithms Applied to Power Distribution System Reconfiguration

The Scientific World JOURNAL ◽

10.1155/2014/506769 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 3

Author(s):

J. L. Guardado ◽

F. Rivas-Davalos ◽

J. Torres ◽

S. Maximov ◽

E. Melgoza

Keyword(s):

Evolutionary Algorithms ◽

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Pareto Optimal ◽

Pareto Optimal Solutions ◽

Optimal Solutions ◽

Power Distribution Systems ◽

Encoding Scheme ◽

Power Distribution System

Network reconfiguration is an alternative to reduce power losses and optimize the operation of power distribution systems. In this paper, an encoding scheme for evolutionary algorithms is proposed in order to search efficiently for the Pareto-optimal solutions during the reconfiguration of power distribution systems considering multiobjective optimization. The encoding scheme is based on the edge window decoder (EWD) technique, which was embedded in the Strength Pareto Evolutionary Algorithm 2 (SPEA2) and the Nondominated Sorting Genetic Algorithm II (NSGA-II). The effectiveness of the encoding scheme was proved by solving a test problem for which the true Pareto-optimal solutions are known in advance. In order to prove the practicability of the encoding scheme, a real distribution system was used to find the near Pareto-optimal solutions for different objective functions to optimize.

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Probability-Based Customizable Modeling and Simulation of Protective Devices in Power Distribution Systems

Energies ◽

10.3390/en15010199 ◽

2021 ◽

Vol 15 (1) ◽

pp. 199

Author(s):

Chengwei Lei ◽

Weisong Tian

Keyword(s):

Power Systems ◽

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Short Circuit ◽

Current Data ◽

System Level ◽

Power Distribution Systems ◽

Power Distribution System ◽

Protective Devices

Fused contactors and thermal magnetic circuit breakers are commonly applied protective devices in power distribution systems to protect the circuits when short-circuit faults occur. A power distribution system may contain various makes and models of protective devices, as a result, customizable simulation models for protective devices are demanded to effectively conduct system-level reliable analyses. To build the models, thermal energy-based data analysis methodologies are first applied to the protective devices’ physical properties, based on the manufacturer’s time/current data sheet. The models are further enhanced by integrating probability tools to simulate uncertainties in real-world application facts, for example, fortuity, variance, and failure rate. The customizable models are expected to aid the system-level reliability analysis, especially for the microgrid power systems.

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Robust Stability Control for Electric Vehicles Connected to DC Distribution Systems

Frontiers in Energy Research ◽

10.3389/fenrg.2021.740698 ◽

2021 ◽

Vol 9 ◽

Author(s):

Wei Teng ◽

Yuejiao Wang ◽

Shumin Sun ◽

Yan Cheng ◽

Peng Yu ◽

...

Keyword(s):

Electric Vehicles ◽

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Voltage Stability ◽

Stability Control ◽

Power Distribution Systems ◽

Power Distribution System ◽

Dc Power ◽

Dc Distribution

DC power distribution systems will play an important role in the future urban power distribution system, while the charging and discharging requirements of electric vehicles have a great impact on the voltage stability of the DC power distribution systems. A robust control method based on H∞ loop shaping method is proposed to suppress the effect of uncertain integration on voltage stability of DC distribution system. The results of frequency domain analysis and time domain simulation show that the proposed robust controller can effectively suppress the DC bus voltage oscillation caused by the uncertain integration of electric vehicle, and the robustness is strong.

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A Unified Theory of Neutral Grounding Methods in Power Distribution Systems

10.31219/osf.io/kq2wv ◽

2020 ◽

Author(s):

Yubo Wang

Keyword(s):

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Detection Sensitivity ◽

Unified Theory ◽

Power Distribution Systems ◽

Power Distribution System ◽

Earth Fault ◽

History Of ◽

Distribution Field

The neutral grounding in power distribution system is an important aspect for earth fault protection, power supply reliability and safety. The performance varies greatly with different grounding methods by which the protective effect presents various results with identical impedance of single phase earth fault. Arguments for better neutral protection has been continued in the distribution field for decades, unfortunately, there is still not a conclusion due to the discussions lacking of a unified modelling or theory of neutral groundings. Thus, the understanding of neutral grounding in most countries differs considerably. Surprisingly solid/isolated grounding in some countries is still considered as a mainstream grounding method in today’s distribution grids, likewise, some utilities are still persisting on adopting resistance grounding to pursue to improve detection sensitivity and reliability, and so on. In this paper, a unified theory is proposed to shed light on the neutral groundings within one unprecedented modelling by which neutral groundings can be compared and evaluated quantitatively for the first time in the history of power distribution field perhaps.

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Recognition of the Single-Phase Ground Fault in Power Distribution System

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.480-481.1581 ◽

2011 ◽

Vol 480-481 ◽

pp. 1581-1586

Author(s):

Jun Zhang

Keyword(s):

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Single Phase ◽

Transient State ◽

Power Distribution Systems ◽

Power Distribution System ◽

Ground Fault ◽

Analysis Computer ◽

Novel Method

For power distribution systems, recognizing the single-phase ground fault is very difficult because there are several faults with similar features. This paper presents a novel method that can help to overcome this difficulty. The idea is to turns the original fault info into a whole system with transient state, steady state and transition state. Theoretical analysis, computer simulation and lab experiments verified the effectiveness of the proposed method.

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Technologies used in Smart Grid to implement Power Distribution System

TELKOMNIKA Indonesian Journal of Electrical Engineering ◽

10.11591/tijee.v16i2.1606 ◽

2015 ◽

Vol 16 (2) ◽

pp. 232

Author(s):

Raja Masood Larik ◽

Mohd Wazir Mustafa

Keyword(s):

Smart Grid ◽

Power Systems ◽

Power Distribution ◽

Distribution System ◽

Smart Grids ◽

Distribution Systems ◽

New Technologies ◽

Power Distribution Systems ◽

Grid Systems ◽

Power Distribution System

<span style="line-height: 107%; font-family: 'Arial',sans-serif; font-size: 9pt; mso-fareast-font-family: Calibri; mso-fareast-theme-font: minor-latin; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;" lang="EN-US">Recently, the debate has been going on about the role of power plus distribution systems, its technologies for future smart grids in power systems. The emerging of new technologies in smart grid and power distribution systems provide a significant change in terms of reduction the commercial and technical losses, improve the rationalization of electricity tariff. The new technologies in smart grid systems have different capabilities to increase the technological efficiency in power distribution systems. These new technologies are the foreseeable solution to address the power system issues. This paper gives a brief detail of new technologies in smart grid systems for its power distribution systems, benefits and recent challenges. The paper provides a brief detail for new researchers and engineers about new technologies in smart grid systems and how to change traditional distribution systems into new smart systems.

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A Unified Theory of Neutral Grounding Methods in Power Distribution Systems

10.36227/techrxiv.12738338 ◽

2020 ◽

Author(s):

Yubo Wang

Keyword(s):

Power Distribution ◽

Distribution System ◽

Distribution Systems ◽

Detection Sensitivity ◽

Unified Theory ◽

Power Distribution Systems ◽

Power Distribution System ◽

Earth Fault ◽

History Of ◽

Distribution Field

The neutral grounding in power distribution system is an important aspect for earth fault protection, power supply reliability and safety. The performance varies greatly with different grounding methods by which the protective effect presents various results with identical impedance of single phase earth fault. Arguments for better neutral protection has been continued in the distribution field for decades, unfortunately, there is still not a conclusion due to the discussions lacking of a unified modelling or theory of neutral groundings. Thus, the understanding of neutral grounding in most countries differs considerably. Surprisingly solid/isolated grounding in some countries is still considered as a mainstream grounding method in today’s distribution grids, likewise, some utilities are still persisting on adopting resistance grounding to pursue to improve detection sensitivity and reliability, and so on. In this paper, a unified theory is proposed to shed light on the neutral groundings within one unprecedented modelling by which neutral groundings can be compared and evaluated quantitatively for the first time in the history of power distribution field perhaps.

Download Full-text