scholarly journals Additional electric loss in rural distribution networks 0.38 kV

2020 ◽  
Vol 209 ◽  
pp. 07007
Author(s):  
Igor Naumov ◽  
Dmitriy Karamov ◽  
Alexander Tretyakov ◽  
Elvira Fedorinova ◽  
Marina Yakupova
Keyword(s):  
Loss Factor ◽  
Power Loss ◽  
Economic Assessment ◽  
Distribution Networks ◽  
Phase Voltage ◽  
Receive Power ◽  
Three Phase ◽  
Zero Sequence ◽  
Electrical Distribution Networks ◽  
Electric Loss

The article presents calculations the additional electric loss in the case of three-phase voltage system unbalance in the real rural electrical distribution networks (0.38 kV). Measurements were carried out at substations that receive power from distribution substation “Petropavlovsk”. Measurements were carried out using a certified device “Resource-UF2M”. Also presented are graphs of changes in currents/voltages of the negative-sequence and zero-sequence, electric loss and other parameters. The results of the economic assessment of electricity losses are presented. As a result, the proposed method for reducing the power loss factor, that can reduce the losses of electricity.

scholarly journals Influence of Clandestine Connections on Energy Loss Evaluation in Electrical Distribution Networks

2020 ◽  
Author(s):  
Clainer B. Donadel ◽  
Gilberto C. D. Sousa ◽  
Flávio M. Varejão
Keyword(s):  
Artificial Intelligence ◽  
Developing Countries ◽  
Energy Loss ◽  
Loss Factor ◽  
Distribution Systems ◽  
Distribution Network ◽  
Distribution Networks ◽  
Operation Costs ◽  
Electrical Distribution ◽  
Electrical Distribution Networks

In the literature, there are several methodologies to estimate technical losses in electrical distribution networks. The range of techniques is broad, ranging from basic techniques (based on loss factor, for example) to sophisticated ones (based on artificial intelligence). These methodologies are important, because the costs of technical losses represent a huge part of the total operation costs of distribution network operators (DNOs). However, the presence of clandestine connections, common in developing countries, was not considered in the methodologies encountered in the literature. Clandestine connections occur when a consumer has made his/her connection without DNO permission. In these cases, the amount of energy consumed by a clandestine "consumer" is a nontechnical loss (and, therefore, should be correctly computed as nonbilled energy). Therefore, a new methodology is proposed to consider the presence of clandestine connections in energy loss estimation in distribution systems.

scholarly journals A Control Strategy for Suppressing Zero-Sequence Circulating Current in Paralleled Three-Phase Voltage-Source PWM Converters

2020 ◽  
Vol 10 (5) ◽  
pp. 1703 ◽  
Author(s):  
Zhao Han ◽  
Xiaoli Wang ◽  
Baochen Jiang ◽  
Jingru Chen
Keyword(s):  
Control Strategy ◽  
Voltage Source ◽  
Duty Ratio ◽  
Phase Voltage ◽  
Pwm Converters ◽  
Circulating Current ◽  
Three Phase ◽  
Zero Sequence ◽  
The Difference ◽  
Zero Vector

In microgrids, paralleled converters can increase the system capacity and conversion efficiency but also generate zero-sequence circulating current, which will distort the AC-side current and increase power losses. Studies have shown that, for two paralleled three-phase voltage-source pulse width modulation (PWM) converters with common DC bus controlled by space vector PWM, the zero-sequence circulating current is mainly related to the difference of the zero-sequence duty ratio between the converters. Therefore, based on the traditional control ideal of zero-vector action time adjustment, this paper proposes a zero-sequence circulating current suppression strategy using proportional–integral quasi-resonant control and feedforward compensation control. Firstly, the dual-loop decoupled control was utilized in a single converter. Then, in order to reduce the amplitude and main harmonic components of the circulating current, a zero-vector duty ratio adjusting factor was initially generated by a proportional–integral quasi-resonant controller. Finally, to eliminate the difference of zero-sequence duty ratio between the converters, the adjusting factor was corrected by a feedforward compensation link. The simulation mode of Matlab/Simulink was constructed for the paralleled converters based on the proposed control strategy. The results verify that this strategy can effectively suppress the zero-sequence circulating current and improve power quality.

scholarly journals A Swarm Approach for Improving Voltage Profiles and Reduce Power Loss on Electrical Distribution Networks

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 49498-49512 ◽  
Author(s):  
Primitivo Diaz ◽  
Marco Perez-Cisneros ◽  
Erik Cuevas ◽  
Octavio Camarena ◽  
Fernando Abraham Fausto Martinez ◽  
...  
Keyword(s):  
Power Loss ◽  
Distribution Networks ◽  
Electrical Distribution ◽  
Electrical Distribution Networks

The Protection System Design of Leakage, Undervoltage and Overvoltage for Electromagnetic Starter in Coal Mine

2014 ◽  
Vol 1049-1050 ◽  
pp. 720-725
Author(s):  
Hong Wei Ma ◽  
Wang Xing ◽  
Qing Hua Mao ◽  
Yu Liu
Keyword(s):  
Coal Mine ◽  
Supply Voltage ◽  
Phase Voltage ◽  
Voltage Transformer ◽  
Dc Power ◽  
Fault Protection ◽  
Three Phase ◽  
Protective System ◽  
Zero Sequence ◽  
Power Direction

For the problem of leakage, undervoltage and overvoltage fault protection of electromagnetic starter with supply voltage of 660 V and rated current of 200A, a leakage, undervoltage and overvoltage protective system based on PLC LM3108K was designed. This system uses voltage transformer to detect three-phase AC voltage. It protects undervoltage and overvoltage fault by judging effective value of three-phase voltage, protects leakage fault of main switch for electromagnetic starter by additional DC power and protects leakage fault of branch switch by using zero-sequence power direction. This system has good protection functions for leakage, overvoltage and undervoltage faults of electromagnetic starter in coal mine.

scholarly journals Study of Technical and Non-technical Factors in Energy Consumption on 20 kV Distribution Networks

2019 ◽  
Vol 1 (2) ◽  
pp. 1
Author(s):  
Mikael Abimanyu Putra Pamungkas ◽  
Dwi Priharto ◽  
Hari Putranto
Keyword(s):  
Power Loss ◽  
Distribution Networks ◽  
High Accuracy ◽  
Energy Losses ◽  
Effective Power ◽  
Three Phase ◽  
Technical Factors ◽  
Current Value ◽  
Construction Model ◽  
Power And Energy

This research aimed to find the technical and non-technical losses that occurred on the 20 kV Tawangrejo Feeder network by calculating the electricity losses after measurement and the calculated losses, made an application to calculate the losses, and determined the improvement alternative from the suitable electricity losses. Based on the data analysis, the conclusions were: Tawangrejo Feeder used mesh configuration with a three-phase four-wire construction model. The values of power and energy losses in total, technical, and non-technical were fluctuating, depended on the current value that was sent from the primary substation to the load. This power loss calculation application had a high accuracy because the error occurred at a maximum of 0.0021%. The most effective power loss improvement was replacing the conductor duct that reduces 56% of power and energy losses.

scholarly journals Passive Reactive Power Compensators for Improving the Sustainability of Three-Phase, Four-Wire Sinusoidal Systems Supplied by Unbalanced Voltages

2021 ◽  
Vol 13 (20) ◽  
pp. 11134
Author(s):  
Elisa Peñalvo-López ◽  
Vicente León-Martínez ◽  
Joaquín Montañana-Romeu ◽  
Javier Cárcel-Carrasco
Keyword(s):  
Carbon Dioxide ◽  
Power Systems ◽  
Carbon Dioxide Emissions ◽  
Reactive Power ◽  
Distribution Networks ◽  
Industrial Applications ◽  
Energy Losses ◽  
Capacitor Banks ◽  
Three Phase ◽  
Zero Sequence

Compensation of reactive power is necessary in power systems due to economical, energetic, and environmental reasons. Reactive power increases energy power losses and carbon dioxide emissions in distribution lines and power transformers. However, capacitor banks used in most industrial applications do not significantly reduce energy losses in lines and transformers when supply voltages and loads are unbalanced and therefore do not fully improve the sustainability of distribution networks. This fact is explained in this paper using positive-, negative-, and zero-sequence reactive power components in three-phase, four-wire sinusoidal power systems supplied with unbalanced voltages. Likewise, several devices have also been developed for the compensation of the total reactive power and, specifically, for each of its components in these power systems. Comparing the effectiveness of these reactive compensators and other well-known passive compensators as capacitor banks on the sustainability improvement of the electrical installation of an actual industry, reductions between 20% and 100% in energy losses and carbon dioxide emissions, caused by circulation of reactive currents in transformer and lines, can be expected depending on the type of compensator used.

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