Donetsk National Technical University
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https://ea.donntu.edu.ua/jspui/handle/123456789/23514| Title: | ЕКСПЕРИМЕНТАЛЬНЕ ДОСЛІДЖЕННЯ НАПРУГИ НУЛЬОВОЇ ПОСЛІДОВНОСТІ РОЗПОДІЛЬНОІ МЕРЕЖІ В ЧАСТОТНІИ ОБЛАСТІ |
| Other Titles: | Экспериментальное исследование напряжения нулевой последовательности распределительной сети в частотной области Experimental Research of Zero Sequence Voltage of the Distribution Network in Frequency Domain |
| Authors: | ЛИСЕНКО, В.А. ЛЫСЕНКО, В.А. LYSENKO, V.A. |
| Keywords: | регулювання системи компенсації ємнісного струму замикань на землю нульова послідовність частотна характеристика незаземлена нейтраль регулирование системы компенсации емкостного тока замыканий на землю нулевая последовательность частотная характеристика незаземленная нейтраль Petersen coil tuning zero sequence voltage frequency domain compensated network |
| Issue Date: | 2013 |
| Publisher: | ДонНТУ |
| Citation: | Наукові праці Донецького національного технічного університету. Серія "Електротехніка і енергетика". № 2 (15), 2013 р., 338 с. |
| Series/Report no.: | Электротехника и энергетика; |
| Abstract: | Наведено результати експериментальних досліджень напруги нульовоі послідовності в розподільних електричних мережах. Досліджено вплив частотних складових на роботу автоматики систем компенсації ємнісного струму однофазного замикання на землю. Запропоновано заходи щодо зменшення негативного впливу частотних складових і математичну модель напруги нульовоі послідовності в частотніи області. |
| Description: | In resonance earthed medium voltage network, the tumng of the Petersen coil is a critical issue for system performance. For resonance grounded network it is necessary to continues match the coil with the network capacitance to earth. This paper is based on testing results of real network. This paper investigates zero sequence voltage interference affecting the Petersen coil automatic tumng device. We cover devices that implement the “frequency” principle of Petersen coil control. Appropriate limits for the study of zero-sequence voltage in the frequency domain are defined. The causes of noise appearing in zero-sequence voltage electric network with ungrounded neutral are analyzed. Time harmomcs are produced by induction motors as a result of the harrnomc content of the m.m.f. distribution. Harmomcs can also occur as a result of electrical asymmetry. Consider an electrically unbalanced rotor winding, the stator winding being balanced such that the supply voltage produces a pure rotating field. Slip frequency e.m.f. is induced in the rotor, but since the rotor winding is unbalanced, both positive and negative phase sequence currents will flow, giving fields in the forward and reverse directions. Integral Cycle Control thyristors regulator, also called ‘burst-firing’ regulator is based on the switching of entire voltage half-cycles. That integral cycle control produces no harrnomc frequencies. It does, however, produce inter-harrnomc and subharmomc frequencies. Zero sequence voltage data are acquired in July, 2011. The analysis is carried out using the software PyLab, MATLAB. The analysis is based on Discrete Fourier transform (DFT) algorithm. The Zero sequence voltage was sampled at 44.1-kHz sampling rate and interfaced to a PC using sound card «Realtek High Defimtion Audio». Typically, voltage power spectra are based on a 4096-points FFT. The results of experiment in the real distributing electrical networks are presented. The acquired data are used to generate a model. Zero-sequence voltage noise consists of the main generated (or fundamental) sine signal, third and higher odd harmomcs of the fundamental sine, white noise, pink flicker noise. Referred noise model can be used in the construction of Petersen coil automatic tuning device that implements the “frequency” principle. |
| URI: | http://ea.donntu.edu.ua/handle/123456789/23514 |
| Appears in Collections: | 2013_Випуск № 2 (15) |
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