Wyniki wyszukiwania - Biblioteka Nauki

1

Application of UPFC for enhancement of voltage profile and minimization of losses using Fast Voltage Stability Index (FVSI)

100%

Kumar S. , Renuga P.

Archives of Electrical Engineering

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2012

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tom Vol. 61, nr 2

239-250

EN

Transmission line loss minimization in a power system is an important research issue and it can be achieved by means of reactive power compensation. The unscheduled increment of load in a power system has driven the system to experience stressed conditions. This phenomenon has also led to voltage profile depreciation below the acceptable secure limit. The significance and use of Flexible AC Transmission System (FACTS) devices and capacitor placement is in order to alleviate the voltage profile decay problem. The optimal value of compensating devices equires proper optimization technique, able to search the optimal solution with less computational burden. This paper presents a technique to provide simultaneous or individual controls of basic system parameter like transmission voltage, impedance and phase angle, thereby controlling the transmitted power using Unified Power Flow Controller (UPFC) based on Bacterial Foraging (BF) algorithm. Voltage stability level of the system is defined on the Fast Voltage Stability Index (FVSI) of the lines. The IEEE 14-bus system is used as the test system to demonstrate the applicability and efficiency of the proposed system. The test result showed that the ocation of UPFC improves the voltage profile and also minimize the real power loss.

2

Optymalne sterowanie urządzeniem FACTS typu PST

88%

Robak S.

Przegląd Elektrotechniczny

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2003

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tom R. 79, nr 2

49-52

PL

W artykule przedstawiono syntezę optymalnego regulatora transformatora z regulacją poprzeczną PST za pomocą metody LQR , rozwiązującej problem optymalizacji przy kwadratowym wskaźniku jakości. Omówiono metody wyboru postaci macierzy wagowych we wskaźniku jakości wykorzystywanym w procesie optymalizacji. Podano też wyniki badań uzyskane za pomocą analizy wartości własnych dla przypadku układu generator-sieć sztywna.

EN

In the paper the design of a Phase Shifting Transformer (PST) control system using the LQR method is presented. The LQR method idea as well as the method of weighting matrices selection in the performance index is described. Results of eigenvalue analysis of the obtained system for the generator - infinite bus model is presented. The obtained results showed that the LQR method allows the design of a very effective PST transformer control system.

3

Wpływ układów uelastyczniających przesył prądu przemiennego na propagację zakłóceń i pracę automatyki zabezpieczeniowej

88%

Szubert K.

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

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2017

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tom Nr 56

95--100

PL

W artykule podano genezę wprowadzenia sterowników uelastyczniających przesył prądu przemiennego FACTS (ang. Flexible AC Transmission System). Podano ich definicję i podział. Ustalono przyczyny poszczególnych zakłóceń dla stanów ustalonych jak i przejściowych oraz opisano działania, jak i urządzenia konieczne do ich ograniczenia. Podano także krajowe korzyści ze stosowania sterowników FACTS oraz związane z nimi wyzwania w przyszłości.

EN

The article provides the genesis of Flexible AC Transmission System (FACTS). It is given a definition and methods of division this controllers, taking into account the design, the used connectors and the destination. For fixed and transient states it is given sources of interferences, which actions should to be taken to mitigate the effects of disturbances, and by which devices can this be accomplished. The article specified a examples of application of FACTS controllers in Poland and tasks which still are waiting for solution. The research directions related to FACTS are given. In conclusion, it is assumed, that further applications of these drivers in power networks are unavoidable. Selecting a type of controller to task at a given site of network should be preceded by a digital simulation to see its impact on other system parameters. The specificity of European networks is different from place where these controllers mainly applied, the coordination of the automatic protection of power network near these controllers belongs to local power dispatchers, and the differents between this systems exclude simple copying of solutions. The research show a different degree of influence of the controllers on the automatic protection.

4

Operational comparison of a new FACTS controller (RHFC) with other FACTS devices considering modified steady-state model

63%

Kazemi A. , Rezaeipour R. , Tayebi M.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 7a

54-58

EN

In this paper, optimal power flow (OPF) is applied to optimally locate Rotary Hybrid Flow Controller (RHFC) and three other Flexible AC Transmission System (FACTS) devices to optimize the total fuel cost, power losses and system loadability as objective functions. The steady-state model of FACTS controllers are developed as a power injection model. A quantitative comparison of them are also investigated from economical and technical point of view. Simulations are performed on IEEE 14-bus and 118-bus test systems using Matlab and GAMS software environments.

PL

W artykule opisano strategię optymalnego przepływu mocy OPF uzyskaną przez zastosowanie układu RHFC (Rptary Hybrid Flow Controller) oraz urządzeń systemu FACTS. Osiągnięto optymalne: koszt paliw, straty mocy i obciążalność.

5

A Survey on Flexible AC Transmission Systems (FACTS)

51%

Eslami M. , Shareef H. , Mohamed A. , Khajehzadeh M.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 1a

1-11

EN

The flexible alternating current transmission system (FACTS), a new technology based on power electronics, proposes an opportunity to improve controllability, stability, and power transfer capability of AC transmission systems. This article presents a comprehensive review and evaluation of FACTS controllers. This paper provides an extensive analysis on the research and improvements in the power system stability development using FACTS controllers. Several technical publications related to FACTS installations have been highlighted and performance comparison of different FACTS controllers has been discussed. Moreover, some of the utility experience, real-world installations, and semiconductor technology development have been outlined.

PL

FACTS (elastyczny system transmisji prądu przemiennego) jest nową technologią bazującą na urządzeniach energoelektronicznych umożliwiającą poprawę sterowalności, stabilności i możliwości przesyłu energii. Artykuł prezentuje przegląd i ocenę kontrolerów stosowanych w tym systemie. Szczególny nacisk położono na porównanie parametrów.

6

Synchrophasors-based transmission line protection in the presence of STATCOM

51%

Ghorbani A.

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tom Vol. 103, nr 1

58--71

EN

The distance relay using the transmission line impedance measurement identifies the type and location of the fault. However, any other factors that cause the failure of the measured impedance, makes the relay detect the fault in incorrect location or do not detect the fault at all. One of these factors is the fault resistance which directly increases the measured impedance by the relay. Another factor that indirectly alters the impedance of the transmission line is static synchronous compensator (STATCOM). When a fault happens, current injection by the STATCOM changes the measured signals by the relay and thus makes the calculated impedance incorrect. In this paper, a method is provided based on the combination of distance and differential protection. Firstly, from the current data of buses, faulted transmission line is detected. Then using the presented algorithm, the fault location is calculated on the transmission line. The basis of the algorithm is on the active power calculation of the buses. Fault resistance is calculated from the active powers and its effect will be deducted from calculated impedance by the algorithm. Furthermore, with choosing data of appropriate bus, STATCOM effect is eliminated, and fault location will be obtained.