scholarly journals Low-voltage power supply system based on three-phase to two-phase and integrated power quality control method

2019 ◽  
Vol 677 ◽  
pp. 052089
Author(s):  
Cheng Guo ◽  
Lianghui Yang ◽  
Liyan Zhang
Keyword(s):  
Quality Control ◽  
Power Quality ◽  
Power Supply ◽  
Power Supply System ◽  
Control Method ◽  
Low Voltage ◽  
Supply System ◽  
Two Phase ◽  
Quality Control Method ◽  
Three Phase

scholarly journals Research, assessment and proposals on resolving power quality problem for the power supply system of Lam Dong alumina refinery, Vietnam

2021 ◽  
Vol 6 (2) ◽  
pp. 121-127
Author(s):  
Thanh Lich Do
Keyword(s):  
Power Quality ◽  
Power Supply ◽  
Power Supply System ◽  
Low Voltage ◽  
Electric Energy ◽  
Supply System ◽  
Resolving Power ◽  
Research Assessment ◽  
Nonlinear Load ◽  
Alumina Production

Alumina production is rather complex technological process of processing mineral raw materials that requires development of effective technological solutions, including in terms of efficiency of using electric energy. The paper is devoted to studying the power supply system of an alumina refinery inLam Dong Province,Vietnam. The tasks that need to be solved for improving the power quality in the power supply system were analyzed. It was shown that non-linear loads significantly degrade the power quality that in turn leads to equipment damage, malfunction and decreasing the refinery productivity. Models of the refinery power supply system were developed and, using which, the quality of power was assessed at the 6 kV voltage utility bus of the power supply system, as well as at the 6 kV and 0.4 kV buses of distribution substations of individual refinery’s subdivisions. Analysis of the simulation findings showed that the nonlinear loads lead to significant distortions of sinusoidal forms of voltages and currents, and decreasing the power factor. Based on the simulation results, it was concluded that voltage harmonics and current harmonics at nonlinear load at the low voltage buses of 0.4 kV and at the buses of 6 kV exceed the permissible limits of the harmonics in accordance with IEEEST519-1992 international standard. Proposals were developed for improving the power quality in the refinery power supply system. For suppressing higher harmonics of current and voltage, it was recommended to use special power quality regulators in the alumina refinery power supply system. It was proposed to use active harmonic filters as the power quality regulators. The proposed solutions allowed obtaining practically sinusoidal forms of voltages and currents in the alumina refinery power supply system.

scholarly journals ОСОБЛИВОСТІ КОНТРОЛЮ І УПРАВЛІННЯ В СИСТЕМАХ ЕЛЕКТРОПОСТАЧАННЯ НАЗЕМНИХ КОМПЛЕКСІВ

2018 ◽  
pp. 25-31
Author(s):  
Вадим Сергеевич Рева ◽  
Константин Николаевич Земляной ◽  
Виктор Петрович Фролов
Keyword(s):  
Power Quality ◽  
Quality Indicators ◽  
Power Supply ◽  
Power Supply System ◽  
Low Voltage ◽  
Block Diagram ◽  
Level Structure ◽  
Supply System ◽  
Information Support ◽  
Process Equipment

The article shows the power quality indicators that are most important for electric consumers: high and low voltage, high-voltage pulses, harmonic distortion, unstable voltage, voltage dips. Possible contingencies in power supply systems of the ground complex (PSS GK) connected with a deviation from the norm of the quality of electric power parameters are analyzed. In accordance with this, the power quality indicators that affect the cyclogram of the preparation for the launch of a space rocket (SR), which need to be monitored, are determined. The objects of management of separate components for operational withdrawal from an emergency situation (ES) are considered. In order to improve the PSS structures and improve the quality and reliability of PSS GK, taking into account the operating modes, at the design stages of the power supply system of GK, it is necessary to create and allocate an automated remote control and monitoring system (ARKMS) as a separate structure within PSS NK. The main requirements for the ARKMS providing control of the power parameters at the terminals of the electrical consumers of the process equipment (PE) are determined by monitoring the oscillograms of the AC voltage, the voltage, frequency and the non-sinusoidal voltage of the alternating current voltage. In addition, ARKMS performs registration and display of power supply parameters of electric consumers, monitoring of the operation of PSS as a whole and their components with reference to a single-time system. In case of exceeding the permissible limits of the power quality indicators, ARKMS will allow to take operational measures necessary for parrying contingencies, thanks to the operation of the elements of the power supply system. Information support was provided with the construction of the generally accepted structural block diagram of such systems, on the basis of which the three-level structure of ARKMS is implemented. The algorithm and basic principles of the ARKMS operation in the normal mode and the mode of exceeding the norms of the power quality indicators (PQI) are considered. A brief description of the structure is given, as well as an example of an algorithm for input control of ARKMS.

scholarly journals A Decomposition Four-Component Model for Calculating Power Losses in Low-Voltage Power Supply Systems

2021 ◽  
Vol 60 (3) ◽  
pp. 79-91
Author(s):  
Dmitry Tugay ◽  
Olexandr Shkurpela ◽  
Valentyn Akymov ◽  
Ivan Kostenko ◽  
Oleksandr Plakhtii
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Low Voltage ◽  
Supply System ◽  
Total Power ◽  
Power Losses ◽  
Component Structure ◽  
Capital Costs ◽  
Proposed Model ◽  
Three Phase

A new model for decomposition of the total power losses, which includes four components is proposed. Each of the components of the proposed model has a certain physical meaning due to the nature of electromagnetic processes in a three-phase four-wire system. Definitions to describe each of the proposed components are formulated. It is shown that each of supplementary components of the total loss power is proportional to the minimum possible loss power and to the square of the RMS value of the power, which is caused by its occurrence in three-phase four-wire power supply system, and it is inversely proportional to the mean square of the net power loss. The synthesized Matlab-model for verification of the four-component structure of power losses showed a high degree of its adequacy. The proposed model allows us to rethink the description of power losses in three-phase AC circuits and can be used in specialized measuring instruments for electrical networks monitoring. Using the information obtained in the monitoring process, it is possible to plan technical measures to reduce losses of electrical energy in the power supply system, as well as to estimate the capital costs of these measures.

Adjusting Electricity Cost Depending on Power Supply Outages

2020 ◽  
Vol 67 (2) ◽  
pp. 44-50
Author(s):  
Vadim E. Bolshev ◽  
Aleksandr V. Vinogradov ◽  
Alina V. Vinogradova ◽  
Aleksey V. Bukreev ◽  
Aleksandr A. Lansberg
Keyword(s):  
Power Quality ◽  
Power Supply ◽  
Power Supply System ◽  
Economic Incentive ◽  
Supply System ◽  
Research Purpose ◽  
Electricity Cost ◽  
Economic Method ◽  
Urgent Task ◽  
Supply Reliability

During the functioning of power supply system, there can be situations where the culprit in interruptions of power supply to consumers and a power quality violation is a power supply company or a consumer himself. Therefore, the economic incentive for power supply companies and consumers to increase power supply reliability and power quality is an urgent task. To implement such incentives, it is necessary to control the facts and time of power supply outages and their values as well as cases and time of non-compliance of power quality with the requirements of standards. It is possible with the use of a monitoring system for power supply reliability and power quality. (Research purpose) The research purpose is in developing a technical and economic method for stimulating power supply companies and consumers to increase efficiency of power supply system. (Materials and methods) The article provides a review of the structural diagram of a system for monitoring power supply reliability and power quality including devices for monitoring the number and duration of power outages and voltage deviations. (Results and discussion). An economic method has been developed to stimulate power supply companies and consumers to increase power supply system efficiency. The essence of the method is to control the parameters of power supply reliability and power quality, identify the violation of these parameters, determine the culprit of the violation, determine the time characteristics of the violation, summarize the duration of violations for the reporting period, compare the actual amount of duration with the allowable one, determine the amount of compensation for the violation and impose sanctions on payment compensation by the perpetrators of violations of these parameters. The article presents an algorithm for adjusting the cost of electricity supplied to consumers depending on the number and duration of voltage deviations and the number and duration of outages. The algorithm serves to ensure the operation of the specified technical and economic method. (Conclusions) The algorithm works in conjunction with a system for monitoring power supply reliability and power quality based on signals from devices that control the number and duration of outages and voltage deviations.

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