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1
Content available Long-Term Monitoring of Flicker and Some Other Parameters of Voltage Quality
Krejci P., Santarius P., Gono R., Brunclik Z.
Transactions on Environment and Electrical Engineering
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2016
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Vol. 1, No. 3
1--8
EN
In 1997 cooperation began between the Faculty of Electrical Engineering and Computer Science and the power company CEZ on a joint project that involved monitoring selected voltage quality parameters. Over the course of several years measurements were carried out at 59 points of the distribution system at a low voltage (LV) level and their power supply nodes at medium voltage (MV) and high voltage (HV) levels, which constituted more than 100 measured points. The measurements continued until 2012 (with a one-year break in 2009) and with a total scope of five cycles of three-year measurements. The last phase of the measurements was focused, inter alia, on the evaluation of 15th and 21st voltage harmonics. From 2013, the cooperation focused again on monitoring flicker in localities with the occurrence of elevated levels of this voltage quality parameter. At these sites, the monitoring of flicker was carried out for two weeks in spring and autumn for a period of three years. The basis for evaluating the quality parameters is the standard EN 50160. In addition the results of annual continual monitoring for one selected locality on MV level will be presented in the paper. In addition the possibility of utilization of intelligent electrometers for monitoring of some quality parameters will be referred in the paper.
2
Content available remote Using SVC to Improve Voltage Stability of the Ghana Power Network
Essilfie J. E., Tlusty J., Santarius P.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 5
47-53
EN
This paper forms part of an ongoing system development of the Ghanaian power network. Preliminary studies have shown that the northern sector is venerable to voltage instability which has led to the proposed installation of STATCOM at Tamale. It is therefore necessary to assess the performance of the device when put in operation. Comparison had therefore been made between the use of STATCOM and Fixed Compensator. Line and generator contingencies as well as small signal disturbances analysis had been carried out. Voltage stability is improved with the installation of STATCOM as well as reduction in voltage oscillation during transient. Loadability limit of the system is also increased. Further evaluation targeted at the inter-tie with Burkina Faso has been proposed.
PL
W artykule opisano prace nad rozwojem sieci elektroenergetycznej Ghany. Badania wstępne wykazały, że północny sektor sieci jest wpływa na niestabilność napięcia. Jako rozwiązanie zaproponowano instalacje kompensatora STATCOM. Dokonano jego porównania z klasycznymi filtrami biernymi, zarówno pod kątem potencjalnych awarii w sieci, jak i niewielkich zakłóceń. Proponowane rozwiązanie zwiększa stabilność napięcia oraz możliwości obciążeniowe.
3
Content available remote PQ Monitoring in Selected Networks of Czech Republic
Krejci P., Santarius P., Hajovsky R., Velicka R., Cumpelik R.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 7b
183-185
EN
In the paper, the results of the complex monitoring of selected PQ parameters during 12 years will be summarized together with the comparison of the changes of parameters after three years on all voltage levels (HV, MV and LV) in the power company CEZ in the North Moravia Region. In addition the results of annual continual monitoring for one selected locality on MV level will be presented in the paper.
PL
W artykule przedstawiono wyniki kompleksowej, trwającej 12 lat, obserwacji wybranych parametrów jakości energii elektrycznej oraz porównanie zmian podstawowych parametrów po 3 latach w sieciach o różnych poziomach napięć (WN, SN i nn) w przedsiębiorstwie energetycznym CEZ w rejonie Północnych Moraw.
4
Power quality monitoring in regional distribution networks in the Czech Republic
Santarius P., Krejčí P., Sikora T., Velička R.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
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2008
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Vol. 323, z. 60
205-206
EN
The liberalisation of the market with electrical energy came into effect in the Czech Republic on 1st January 2002. In the first phase, big consumers (consumption over 40 MWh per year) were affected. This market has been liberalized completely since 2006. In our opinion, power companies pay sufficient attention to ensuring the required technical parameters. Customers usually have only one technical choice of the supply of electrical energy. But in the liberalised market environment entitled customers can choose from several traders of electrical energy. The key criterion for the choice is surely the offered price. But in steady market environment, where the offered prices will be balanced, other parameters will be more important when making decisions, and we expect that ensuring quality parameters will increase its role. The quality of electrical energy can be looked upon from the point of view of technical parameters of the supplied voltage and current, or from the commercial point of view (the quality of the supplied electrical energy and services). In the power company CEZ in the North Moravia region the monitoring of a number of selected parameters of the quality of electrical energy (harmonics, flicker, unbalance) is being done in cooperation with research laboratories of the Faculty of Electrical Engineering and Computer Science, VŠB - Technical University of Ostrava. The monitoring is being done in a complex way in 59 feeding points 400 V, always in one week intervals, and at the same time on all voltage levels (HV, MV and LV). The whole cycle lasted for 3 years, and currently the fourth cycle of monitoring is realised. 3 full cycles enables comparing of the state after twice three years. In the paper, the results of the first, second and third cycle of the complex monitoring will be summarised together with the comparison of the changes of parameters after three years. In the second cycle of monitoring there were measured currents in the neutral conductor. The results of monitoring of harmonic components of current in the neutral conductor will be presented in the paper. Beyond period monitoring are installed on chosen 100kV substations stationary monitoring devices. Analyzers QWave Power and QW Light (by the LEM Company) are installed here, so it is possible to record as many informations about both individual voltage quality parameters and events in the distribution system as possible. QWave Power measures all parameters of voltage quality simultaneously and compares these with limit values of the standard CSN EN50160, and further analyses the current. QWave Light is a simplified version that evaluates only voltage in all its guaranteed and indicative parameters. The instruments are successively installed in other MV and HV nodes. This paper summarizes results of 10 years of long-term periodical power quality monitoring. Further are in detail described methods of power quality monitoring methods with focus on use of composite measuring instruments.
5
Výsledky dlouhodobého monitorovaní kvality elektrické energie
Bičovská B., Santarius P., Velička R., Krejčí P.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
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2006
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Vol. 315, z. 56
51-57
EN
The new energy law has been liberating stepwise market with electrical energy in the Czech Republic since 2001. This market has been liberated completely since 2006. The expansion of electrical appliances with nonlinear characteristic in distribution networks LV (such as televisions computers, copiers, compact lights) affects strong debasement of quality parameters of the supplied electric power. The complex monitoring of selected parameters of voltage quality has been going in power company CEZ since 1997. In the paper, the results of a long-term monitoring of the power quality are summarized.
6
Long-term experience in international education cooperation
Kabza Z., Santarius P., Krejčí P.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
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2006
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Vol. 315, z. 56
241-249
EN
The Faculty of Electrical Engineering and Computer Science, which was founded as an independent faculty in 1990, is developing in line with the needs of restructuring of industry in the North Moravian region in the Czech Republic. Mutual active collaboration with big industrial and power companies, as well as smaller private firms, is essential to the faculty in terms of education and also science and research. Also, the faculty enjoys long-term collaboration with Faculty of Electrical Engineering and Automation, Technical University of Opole in Poland; this collaboration intensified after accession of both countries to the EU. Collaboration developed both in the education and research areas. The result of this long-term collaboration is a project under the close-border cooperation programme INTERREG. Dialogue between representatives of the industry and universities can contribute substantially to increasing the efficiency of collaboration.
7
Monitoring of the power quality in the distribution networks in the Czech Republic
Santarius P., Gavlas J., Krejci P., Vasenka P.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
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2005
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Vol. 299, z. 55
189-202
EN
The liberalization of the market with electrical energy, which came into effect in the Czech Republic in 2002, brings about new requirements as far as the quality of the supplied electrical energy is concerned. In the paper, the results of a long-term monitoring of the selected parameters of the quality in the regional power company are summarised, (including the evaluation of the trends of change), the results of the monitoring of the extreme power quality parameters together with the results of evaluation of voltage drops in the selected sites of the regional power company.
8
Quality of electric power supply - selected problems
Bicovská B., Santarius P., Gavlas J., Krejci P., Vasenka P.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
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2004
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Vol. 295, z. 53
87-93
PL
Począwszy od 2001 r. nowe prawo energetyczne liberalizuje stale rozwijający się rynek energii elektrycznej w Republice Czeskiej. Proces liberalizacji tego rynku powinien zakończyć się w 2006 r. Rozwój urządzeń elektrycznych z nieliniową charakterystyką w sieciach dystrybucyjnych niskiego napięcia (takich jak telewizory, komputery, kopiarki, światła kompaktowe) wpływa na znaczne obniżenie parametrów jakości dostarczanej energii elektrycznej. Kompleksowy monitoring wybranych parametrów jakości napięcia jest prowadzony od 1997 r. w północno-morawskim przedsiębiorstwie energetycznym. Artykuł omawia wyniki dwóch cykli monitoringu jakości energii elektrycznej.
EN
The new energy law has been liberating stepwise market with electrical energy in the Czech Republic since 2001. This market should be liberated completely in year 2006. The expansion of electrical appliances with nonlinear characteristic in distribution networks LV (such as televisions computers, copiers, compact lights) affects strong debasement of quality parameters of the supplied electric power. The complex monitoring of selected parameters of voltage quality has been going in Northern-Moravian Power Company since 1997. This article takes in results of two cycles of monitoring of electrical power quality.
9
Jakość energii elektrycznej na rynku liberalizowanym
Santarius P., Gavlas J., Vašenka P.
Zeszyty Naukowe. Elektryka / Politechnika Opolska
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2002
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Vol. 280, z. 51
591-598
PL
Rozprzestrzenianie się urządzeń z nieliniową charakterystyką w dystrybucyjnych sieciach niskiego napięcia (nn) ( takich jak telewizory, komputery, żarówki kompaktowe, itp.) powoduje degradację jakości energii elektrycznej. Do oceny aktualnego stanu i do projektu potrzebnych pomiarów została wykonana seria pomiarów w sieci dystrybucyjnej, które były zogniskowane przeważnie na złożonej ocenie kilku ważnych parametrów jakości energii elektrycznej (harmoniczne, wahania napięcia i asymetria napięcia) w dystrybucyjnej sieci regionalnej dystrybucyjnej spółki w Republice Czeskiej. Znaczenie pomiarów jakości energii elektrycznej jest rosnące, ponieważ nowe prawo energetyczne zacznie otwierać rynek energii elektrycznej w roku 2002. Pomiary i ocena jakości były realizowane w więcej niż pięćdziesięciu punktach węzłowych sieci dystrybucyjnej zgodnie z normą EN 50160. W referacie tym są końcowe wyniki złożonych badań z istotnym porównaniem w stosunku do standardu EN 50160.
EN
Spreading of appliances with non-linear characteristic in the LV distribution networks (such as TV sets, computers, compact fluorescent lamps, etc.) causes degradation of a supplied power quality. For evaluation of current status and for design of needed measures was performed series measuring in the distribution networks which were focused mostly on a complex evaluation of some important quality parameters (harmonics, voltage fluctuation and voltage unbalance) in the distribution network of a regional distribution company in the Czech republic. The importance of the power quality monitoring is increasing because the riew energetic law will start opening the electricity market since the year 2002. The measures and the evaluation of quality was realised on more then 50 supply nodes of the distribution network according to the standard CSN EN 50160. In the paper there are summarised results of a complex research with relevant evaluation in relation to the standard CSN EN 50160.
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