A Dynamic and Heuristic Phase Balancing Method for LV Feeders

Applied Computational Intelligence and Soft Computing ◽

10.1155/2016/6928080 ◽

2016 ◽

Vol 2016 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Samad Taghipour Boroujeni ◽

Mohammad Mardaneh ◽

Zhale Hashemi

Keyword(s):

Single Phase ◽

Voltage Drop ◽

Combinatorial Problem ◽

Time Varying ◽

Communication Interface ◽

Dynamic Phase ◽

Three Phase ◽

Unbalanced Load ◽

Remote Controller ◽

Balancing Control

Due to the single-phase loads and their stochastic behavior, the current in the distribution feeders is not balanced. In addition, the single-phase loads are located in different positions along the LV feeders. So the amount of the unbalanced load and its location affect the feeder losses. An unbalanced load causes the feeder losses and the voltage drop. Because of time-varying behavior of the single-phase loads, phase balancing is a dynamic and combinatorial problem. In this research, a heuristic and dynamic solution for the phase balancing of the LV feeders is proposed. In this method, it is supposed that the loads’ tie could be connected to all phases through a three-phase switch. The aim of the proposed method is to make the feeder conditions as balanced as possible. The amount and the location of single-phase loads are considered in the proposed phase balancing method. Since the proposed method needs no communication interface or no remote controller, it is inexpensive, simple, practical, and robust. Applying this method provides a distributed and dynamic phase balancing control. In addition, the feasibility of reducing the used switches is investigated. The ability of the proposed method in the phase balancing of the LV feeders is approved by carrying out some simulations.

Download Full-text

General steady-state analysis of three-phase self-excited induction generator feeding three-phase unbalanced load∕single-phase load for stand-alone applications

IEE Proceedings - Generation Transmission and Distribution ◽

10.1049/ip-gtd:20030072 ◽

2003 ◽

Vol 150 (1) ◽

pp. 49 ◽

Cited By ~ 59

Author(s):

S.S. Murthy ◽

B. Singh ◽

S. Gupta ◽

B.M. Gulati

Keyword(s):

Steady State ◽

Single Phase ◽

Induction Generator ◽

Steady State Analysis ◽

Three Phase ◽

Unbalanced Load ◽

State Analysis

Download Full-text

The Economic Operation of Common Coupling Groups of Distribution Transformer

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.521.288 ◽

2014 ◽

Vol 521 ◽

pp. 288-291

Author(s):

Yu Sheng Quan ◽

Xin Zhao ◽

Hua Gui Chen ◽

En Ze Zhou

Keyword(s):

Single Phase ◽

Short Circuit ◽

Phase System ◽

Distribution Transformer ◽

Three Phase ◽

Unbalanced Load ◽

Transformer Coupling ◽

The Difference ◽

Short Circuit Fault ◽

Better Than

Based on the method of symmetrical components of D, 11 and Y, o distribution transformer coupling two different effects of different magnetic circuit coupled to the three-phase system with a system-generated analysis and comparison. Analysis of the difference between the two groups of different connections on the transformer structure. Described in the single-phase short circuit fault clearing, 3n harmonic current suppression and affordability aspects of single-phase unbalanced load, D, ll coupling transformers are significantly better than Y,0 coupling transformer. This has necessarily important for the study of energy loss reduction.

Download Full-text

Three-phase Quaternion Power in Three-wire Systems

Renewable Energy and Power Quality Journal ◽

10.24084/repqj19.327 ◽

2021 ◽

Vol 19 ◽

pp. 493-498

Author(s):

André S. F. Komeno ◽

◽

Anésio L. F. Filho ◽

Joao Y. Ishihara ◽

Victor P. Brasil

Keyword(s):

Power Systems ◽

Systems Analysis ◽

Quaternion Algebra ◽

Average Power ◽

Time Varying ◽

Instantaneous Power ◽

Three Phase ◽

Complex Power ◽

Unbalanced Load ◽

Unbalanced Loads

Instantaneous power theory has a central role in power systems analysis. Among mathematical settings used for the development of this theory, quaternion algebra has been used for describing electrical variables in recent works. In this context, this paper aims to describe three-phase power in a quaternion framework. We analyze quaternion power for balanced and unbalanced delta loads, comparing the expressions obtained to the usual expressions of complex power. The quaternion power expression obtained also makes it natural to introduce a decomposition of the unbalanced load in terms of a balanced component and an unbalanced load with null average power. It is also shown that delta unbalanced loads are equivalent to time-varying balanced loads. The results obtained extend the power systems theory in the quaternion domain and emphasize the advantages of using this framework.

Download Full-text

Design Of Distribution Board Unit For A Business Focus

European Journal of Electrical Engineering and Computer Science ◽

10.24018/ejece.2019.3.5.136 ◽

2019 ◽

Vol 3 (5) ◽

Author(s):

Oyeleye Matthew Olayinka

Keyword(s):

Single Phase ◽

Voltage Drop ◽

Circuit Breaker ◽

Protective Device ◽

Circuit Breakers ◽

Research Focus ◽

Supply Source ◽

International Standard ◽

Protective Devices ◽

Three Phase

This research focus on adequate sizing of miniature circuit breakers (MCBs) and Molded Case Circuit Breaker (MCCB) of distribution board unit for a business center/focus. The aim of this research is to overcome the tripping and burning of connected loads in the study area. The load survey of the business center was carried out and the current rating of the associated equipment used were computed, using the data obtained from the name plate of the equipment. The rated values of the existing MCBs and MCCB were compared with the recommended values obtained from international codes in order to determine the inadequacy of the existing ones in term of protection for the connected load. The result obtained shows that 11% of the load are adequately protected against over current, 6% of the existing load is under-rated while 83% of the load were not over current protected in the existing DB. Re-design the DB protective devices was carried out in accordance with the international codes to avoid tripping and frequent burning of loads. The number of MCBs resigned is 22.5 single phase MCBs. 23 single phase DB are not readily available, three phase, 8-Way DB is recommended with 25% future expansion. The voltage drop for the cable between the MCCB and the supply source is lesser (0.4%) than 3% recommended by NEC. 100% of the load are protected in the new design hence protection for all the connected loads against overcurrent damage thus removing tripping and burning of many connected loads in the studied area Equation to size DB is proposed in this work. Overcurrent protective device (CB) must conform to international standard of 1.25 multiplying factor in order to adequately protect the intending load. This is necessary to reduce cost of maintenance and or otherwise procurement of new one. It is also necessary to avoid disruption of work or service.

Download Full-text