Influence of wind generator different operating regimes to the power quality in supply network

In a deregulated electric service environment, an effective electric transmission and distribution networks are vital to the competitive environment of reliable electric service. Power quality (PQ) is an item of steadily increasing concern in power transmission and distribution. The traditional approach to overcoming capacity and quality limitations in power transmission and distribution in many cases is the addition of new transmission and/or generating capacity. This, however, may not be practicable or desirable in the real case, for many of reasons. From technical, economical and environmental points of view, there are two important - and most of the time combined - alternatives for building new transmission or distribution networks to enhance the transmission system capacity, and power quality: the Flexible alternating current transmission devices and controllers, and the distributed generation resources near the load centers. The connection of distributed generation to the distribution grid may influence the stability of the power system, i.e. angle, frequency and voltage stability. It might also have an impact on the protection selectivity, and the frequency and voltage control in the system. This paper presents a low cost FACTS based Dynamic Distribution System Compensator (DDSC) scheme for voltage stabilization and power transfer and quality enhancement of the distribution feeders connected to a dispersed wind generator, using MATLAB/ SimPower System simulation tool.

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Augmentation of Power Quality of Grid-Connected Wind Generator by Fuzzy Logic Controlled TSC

2018 IEEE/PES Transmission and Distribution Conference and Exposition (T&D) ◽

10.1109/tdc.2018.8440565 ◽

2018 ◽

Author(s):

Sagnika Ghosh ◽

Mohd. Hasan Ali

Keyword(s):

Fuzzy Logic ◽

Power Quality ◽

Wind Generator

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Study Results of the Electrical Parameters of the High-Power "Ladle-Furnace" Unit and its Impact on the Power Supply Network

Elektrichestvo ◽

10.24160/0013-5380-2021-3-33-43 ◽

2021 ◽

Vol 3 (3) ◽

pp. 33-43

Author(s):

Ivan N. APRELKOV ◽

Keyword(s):

Electric Power ◽

Power Quality ◽

Power Supply ◽

Electric Arc ◽

Furnace Unit ◽

Operating Conditions ◽

Ladle Furnace ◽

Supply Network ◽

Study Results ◽

Electric Power Quality

The steel refinement and its chemical composition and temperature finalization processes in a pouring ladle carried out by heating the metal with electric arc have received wide use at modern metallurgical enterprises. The article considers the electrical operating conditions of the ladle furnace unit (LFU) equipped with a 40 MVA electric furnace transformer. It was expected that the LFU load would vary insignificantly, because the electric arc burns between the electrodes and the surface of already molten metal, without the occurrence of short circuits. However, the accomplished studies testify that the LFU load is abruptly variable and nonlinear in nature, and gives rise to significant voltage fluctuations and harmonic distortions in the power supply network. The flicker intensity (severity) factor has been estimated, and the level of current harmonic components generated due to LFU operation has been determined. By using the obtained results, it becomes possible to predict the influence of LFU electric operating conditions on the levels of electric power quality indicators in changing the power supply network parameters, and to adopt circuit engineering solutions for assuring the electric power quality in the plant electric power supply system.

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