scholarly journals Equipment Operation and Maintenance Management of Shanghai Power Distribution Network After Power System Reform

2018 ◽  
Vol 152 ◽  
pp. 1182-1187
Author(s):  
Fanyue Qian ◽  
Yao Liu ◽  
Yongwen Yang ◽  
Weijun Gao ◽  
Yiqun Wu
Keyword(s):  
Power System ◽  
Power Distribution ◽  
Distribution Network ◽  
Maintenance Management ◽  
System Reform ◽  
Power Distribution Network ◽  
Equipment Operation ◽  
Operation And Maintenance

Harmonic distortion minimization in power system using differential evolution based active power filters

2020 ◽  
Vol 13 ◽  
Author(s):  
Alok Kumar Mishra ◽  
Soumya Ranjan Das ◽  
Prakash Kumar Ray ◽  
Ranjan Kumar Mallick ◽  
Himansu Das
Keyword(s):  
Power System ◽  
Power Distribution ◽  
Computer Network ◽  
Distribution Network ◽  
Harmonic Distortion ◽  
Pso Algorithm ◽  
Global Optimum ◽  
Phase System ◽  
Power Distribution Network ◽  
Three Phase

Aims : The main focus in this work is to improve balanced and sinusoidal grid currents by feeding compensating current at point of common coupling (PCC). Background: In recent years the advancement in electronics and electrical appliances are widely improved and are also more sophisticated. These appliances require uninterrupted and quality power. Therefore in the growing power system scenario, several issues like malfunction of electrical sensitive devices, overheat in transformer, interference in communication, failures in computer network etc., adversely affects the power quality (PQ). These issues are generated due to rapid use of non-linear loads in three-phase system which generates harmonics in the system. To overcome from these PQ issues, several PQ mitigation custom power devices are integrated in power distribution network. But, the conventional PQ mitigation devices are insufficient to eliminate PQ problems such as current and voltage harmonics, voltage sag/swell and voltage unbalances associated with the power distribution network. Objective : The objective of using A-PSO is to find the global optimum of the spread factor parameter at the upper level. APSO, has a faster convergence speed and correct response compared to the PSO algorithm. Method : SO A-PSO M p-q. Result: A-PSO is giving better results than PSO. Conclusion : A three-phase system with SHAPF injected at PCC is proposed in this paper. The SHAPF injects filter current at PCC for supressing the harmonics using a modified pq scheme. For controlling the PIC, two optimised parameters are discussed and found that reducing the harmonics distortions using A-PSO is giving better results compare to the conventional PSO.

scholarly journals Study on Reliability Evaluation Method Based on Improved Monte Carlo Method

2018 ◽  
Vol 64 ◽  
pp. 04008
Author(s):  
Jun Liu ◽  
Fan Yang ◽  
Lijia Ren
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Power System ◽  
Power Distribution ◽  
Distribution Network ◽  
Distribution Networks ◽  
Reliability Evaluation ◽  
Grid Structure ◽  
Power Distribution Network ◽  
Uniform Sampling

The advancement in science and technology comes with continuously expanding power system scale, increasingly complex system operation condition and higher requirements for accuracy and speed of power system reliability evaluation, but actual calculation methods cannot meet the needs. Therefore, there is need to improve the reliability of conventional power distribution network so that requirements of calculation speed and calculation accuracy can be met. In this paper, reliability of the power distribution network will be evaluated using improved Monte Carlo method with uniform sampling. The average value is obtained through calculation of state of multiple sub-intervals and test functions, which effectively improves calculation accuracy, and further increases the utilization of random numbers. By improving the uniform sampling method, the Monte Carlo simulation variance is reduced, and evaluation and calculation efficiency is improved. At the same time, unqualified power grid is selected for analysis. Based on the simulation results, qualified power distribution networks are compared to point out where the requirements are not met. Also, comparative analysis is made on the effect of power distribution network grid structure etc. on the user’s power supply. Finally, suggestions for improving power distribution network reliability are given from equipment reliability, grid structure.

scholarly journals Mitigation of Unbalanced Voltage Sags and Swells of Power System in Utility Side by using Sen Transformer

2018 ◽  
Vol 7 (2.24) ◽  
pp. 267
Author(s):  
Loveswara Rao Burthi ◽  
P S.Prema Kumar
Keyword(s):  
Power System ◽  
Power Distribution ◽  
Distribution Network ◽  
Operating Conditions ◽  
Voltage Sags ◽  
Power Distribution Network ◽  
Supply Effect ◽  
Unbalanced Voltage ◽  
Voltage Swells ◽  
Electrical Loads

Majority of the industrial electrical loads requires balanced three phase supply but in reality there is unbalanced supply due to single phase loads like railway tracks etc.increasing use of non linear loads in modern power distribution network there are some power quality issues like voltage sags and voltage swells, this distortion of the power supply effect the loads which are connected to power distribution network. In order to improve quality of the power, in this paper a Sen Transformer (ST) technique as been proposed to minimize unbalanced voltage sags and swells. The proposed technique mitigates both voltage sag and swell during balanced and unbalanced operating conditions. The proposed ST consists of a programmable tap controller to compensate ride through faults in power system network. The proposed work as been implemented using MATLAB/SIMULINK software. To validate the proposed work, simulation results are presented.  

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