The statistic properties of rms voltage and frequency in the ship's electrical power system

Opis

The dataset is a part of the research results on the quality of supply voltage on bus bars of the main switchboard of the ship's electrical power system in different states of ship exploitation. The attached dataset contains the results of a statistical analysis of rms voltage and frequency in the ship's electrical power system. The following statistical attributes were determined: the mean value, the standard deviation, the skewness, and the kurtosis, both for rms voltage and frequency. The measurements were carried out on board various ships: ferry, ro-ro, and car carrier.

Each ship contains a three-phase, three-wire electrical power system. The electrical power plant of the ferry and ro-ro systems consists of free-standing generating sets as well as shaft generators. The source of electrical power is three-phase synchronous generators driven by auxiliary diesel engines. Additionally, shaft generators driven by the propeller shaft of the main engine are used. The ferry’s electrical power plant consists of three free-standing generators of 1400 kVA each, and two shaft generators 1375 kVA each. The nominal voltage on bus bars of the main switchboard was 380 V with a frequency equal to 50 Hz. The ferry was equipped with two free-standing generators of 1000 kVA each and two shaft generators of 1500 kVA each. The nominal voltage on bus bars of the main switchboard was 400 V at a frequency of 50 Hz. The car carrier’s electrical power plant consists of six free-standing generators of 1500 kVA each. The nominal voltage on bus bars of the main switchboard was 3300 V and 440 V with a frequency equal to 60 Hz. All ships were capable of generating the voltage of 220V, and after transformation – 440V, 400V, and 380V as well.

The voltage waveforms on bus bars of the main switchboard were recorder with the digital measuring system, which allows the simultaneous measurement of three phase-to-phase or two-phase voltages. Its hardware part consists of a signal preconditioning block, an antialiasing filter, and a data acquisition board with a resolution of 16 bits and a sampling rate of up to 20 kS/s. The maximum sampling rate is equal to 6.6 kS/s for using three channels at the same time.

The virtual part of the system is realized in the graphical programming environment LabVIEW. The instantaneous values x(i) of voltage and frequency were obtained for the time frame of 1300 (1105) samples, with a sampling frequency of 6500 Hz, which corresponds to ten periods of a sine wave with a frequency of 50 Hz (60 Hz). The mean value, the standard deviation, the skewness, and the kurtosis were calculated based on of the instantaneous values averaged over 40 minutes of the observation time.

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Statistics.zip

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Rok publikacji:

2020

Data zatwierdzenia:

2021-01-04

Data wytworzenia:

2020

Język danych badawczych:

angielski

Dyscypliny:

Automatyka, elektronika i elektrotechnika (Dziedzina nauk inżynieryjno-technicznych)

DOI:

10.34808/xea9-gy95

Weryfikacja:

Politechnika Gdańska

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Autorzy

Beata Pałczyńska dr inż.
Katedra Metrologii i Systemów Informacyjnych
numer orcid 0000-0002-2404-6500otwiera się w nowej karcie
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wyświetlono 169 razy

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