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This paper is focused on the development of the new principles and operational algorithms of the transmission lines distance protection. The proposed distance protection algorithms utilize statistical information about the undefined and random parameters and quantities such as equivalent impedances of the systems at the unmonitored end of the power transmission line and current and voltage phasor...
In this paper we consider possible technical challenges which may arise while attempting to modernize today's electric power systems by connecting many distributed generators (DG) of diverse technologies closer to the end-users within the distribution networks. We report that connecting larger (~1 MW) DGs at the network locations, which result in minimal delivery losses, may lead to frequency instabilities...
The fast development in both microprocessor and transducer technologies has enabled fault detection techniques to be considered which were impractical in the past and encouraged interest in the utilization of fault generated transients for protection. This paper presents an integrated approach for high-speed protection of transmission lines. The technique uses a fault transient detector unit at the...
This paper describes modeling algorithms in order to obtain different types of electromagnetic disturbances from the power supply network. The main algorithm is designed for voltage sags with exponential fronts and uses an exponential function for each sag front. It also uses the data range translation to an adequate specified range in order to obtain the desired waveshape and the use of of the algorithm...
This paper deals with damping modeling for transformer energization studies for system restoration purposes. A review of some of the literature recommendations for these studies is presented. Then, several damping models for generators, lines and transformers are benchmarked by means of simulation vs. field test measurements comparison. For the field test case considered, results show that simple...
This paper presents a novel formulation for differential protection of three-phase transformers. The discrete wavelet transform (DWT) is employed to extract transitory features of transformer three-phase differential currents to detect internal faulty conditions. The performance of the proposed algorithm is evaluated through simulation of faulty and non-faulty test cases on a power transformer using...
Series compensated power system may lead to a very unusual problem known as Subsynchronous Resonance (SSR). Flexible AC Transmission Systems (FACTS) controllers are widely applied to mitigate subsynchronous oscillations. The Static Synchronous Compensator (STATCOM) is a shunt device of the FACTS family using power electronics to control power flow and improve transient stability on power grids. With...
Vehicle-to-Grid (V2G) technology has drawn great interest in the recent years. Success of the V2G research depends on efficient scheduling of gridable vehicles in limited parking lots. V2G can reduce dependencies on small expensive units in the existing power systems as energy storage that can decrease running costs. It can efficiently manage load fluctuation, peak load; however, it increases spinning...
Due to the implementation of new markets, i.e. intraday markets as well as the markets for reserve, a higher number of planning uncertainties has to be considered within the operation planning of power plants. Besides outages of thermal power plants and prices at day-ahead wholesale markets, the prices at the intraday market and the market for minute reserve as well as the requested amount of reserve...
In rural areas and remote areas the expenditure for new projects related to broadband communications is deterred. In this paper hybrid Wireless-Broadband over Power Lines (W-BPL) technology, suitable for rural and remote areas is presented. This hybrid approach employs BPL technology for the transmission of communication signals via the medium voltage (MV) grid and wireless technology for providing...
This paper presents a method to obtain confidence intervals (CI) for load forecast. It is based on the calculation of empirical quantiles of relative forecast error observed in the past. A classification is made between days for which the load forecast is difficult and those for which it is easier; this classification is made a priori, based on forecast error knowledge. Some CI's skills for the confidence...
The ldquoTrilateral Market Couplingrdquo (TLC) between France, Belgium and the Netherlands was set up in November 2006. It allows an optimal allocation of the cross-border capacities that are submitted by the Transmission System Operators through an implicit auctioning mechanism. The level of price convergence in this region has given incentives to extend this mechanism to Luxemburg and Germany in...
Technical improvements in the construction of EHV cables have made possible the installation of very long EHV AC cable lines; with a sufficient degree of voltage control such lines can retain a large part of their theoretical power transmission capability. Quick, accurate expressions for the evaluation of cable length-loading relationships are given to that purpose. Appropriate choice of shunt compensation...
Wind power introduces a new challenge to system operators. Unlike conventional power generation sources, wind power generators supply intermittent power because of uncertainty in its resource. In a power system involved large-scale wind power generation scenario, wind intermittency could oblige the system operator to allocate a greater reserve power, in order to compensate the possible mismatch between...
The massive integration of distributed generation (DG) can cause voltage disturbances at the connection points. In order to maximize the penetration of DG power, the actual topology of distribution grids should change introducing active devices to control the voltage, especially in weak networks. In this paper it is analyzed the integration of DG in a weak network connected to a MV/LV substation,...
FACTS devices might be successfully applied in power-system dynamics; however, appropriate control is a precondition for this. Some attempts were already made in searching of proper control strategies, but mainly according to local parameters and only for simple FACTS devices with only one controllable parameter. In this paper we present a control strategy for a GUPFC with multiple controllable parameters...
In times where the reduction of the yearly expenditures of utilities and therefore the optimal assignment of assets have a very high priority, the knowledge about future expenditures of the following 40 or 45 years is very useful. This paper shows a method to calculate the yearly capital and operational expenditures CAPEX and OPEX, respectively with the aid of ageing models consisting of different...
This paper presents a simulation model of DC traction system which is based on bilateral power supply mode. The model of two substation rectifiers in one track section has been proposed which is according to practical situation. The modeling was conducted with respect to the variations of the starting-up process and short circuit conditions. By comparing and investigating the simulation results of...
This paper presents possible selective current compensation strategies based on the Conservative Power Theory (CPT). This recently proposed theory, introduces the concept of complex power conservation under non-sinusoidal conditions. Moreover, the related current decompositions results in several current terms, which are associated with a specific physical phenomena (power absorption P, energy storage...
Fixed speed wind turbine generator system (WTGS) uses induction generator as wind generator. Besides some of its advantages, it suffers greatly to meet the requirements of new wind farm grid code due to the dependency on reactive power. Some flexible AC transmission systems (FACTS) devices have been proposed recently for compensating the reactive power of induction generator during network disturbances...
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