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Today transmission lines are protected by protection relays at their terminating stations. If a fault appears, the protection relays of the faulty line as well as of adjacent lines react and record measurement data. Until today these records are often unexploited. The objective of this work is to analyse these records with the goal to identify equipment parameters in particular to estimate parameters...
The strategic bidding problem for generation companies (GENCOs) in a pay as bid market is considered with respect to risk analysis for different participant types, in which GENCOs suffer from lack of complete information about other opponents bidding strategies. According to Iran power market characteristics, in which participants should declare their maximum available energy to the ISO, Bertrand...
Lightning caused around 26% of the total number of faults in the Portuguese transmission system in the analysed period. Based on historical data, this study uses incident data from 2001 until 2008 (2157 faults in overhead lines) and lightning data from 2003 until 2008 (around 1.65 million cloud-to-ground flashes). The performance of the lightning monitoring system is analysed and the statistical analysis...
The paper is presenting an algorithm for establishing the best types of electrical storages for the virtual synchronous generator (VSG), depending on the application case and desired nominal power of the VSG. The resulting application provides a description of available technologies in terms of characteristics matching the desired properties of the storage in accordance with the scenarios described...
Phasor based Wide Area Monitoring and Control Systems (WAMC) promise to offer more accurate and timely data on the state of the power system, thus, increasing the possibilities to manage the system at a more efficient and responsive level and apply wide area control and protection schemes. This paper presents results of a survey on communications and technical requirements for applications based on...
As the electrical power industry is restructured, the electrical power exchange is becoming extended. One of the key information used to determine how much power can be transferred through the network is known as available transfer capability (ATC). To calculate ATC, traditional deterministic approach is based on the severest case, but the approach has the complexity of procedure. Therefore, novel...
Techniques for locating a partial discharge source are of major importance in both the maintenance and repair of a transformer. This paper presents a novel approach to identify partial discharge locations in transformer winding using neural network. In this paper for simulation and detection of partial discharge, detail model of transformer is used. With modeling of partial discharge impulse source...
Under a deregulated environment, transmission congestion involves in system security and market efficiency. How to relieve congestion and allocate congestion cost reasonably is one of the important contents. In this paper, a method for congestion cost allocation in a pool based model is proposed. The congestion cost is firstly allocated to congested lines by Shapley-value; then the line costs are...
This paper employs a quasi dynamic model for transient and long term analysis. The set of equations considered permits to calculate the solution by using the Newton-Raphson's method. The simplicity of the model allows one to obtain some pieces of information required to take preventive control actions. A particular case of interest is the ramp load increase. For this sake, a real Brazilian system...
Renewal process has been frequently employed as a mathematical model of components in power system reliability analysis. However, some of the components may enter an aging stage and this paper illustrates the effects of aging in reliability modeling. To implement the history of working and failure of system, Stochastic Point Process modeling based on Sequential Monte Carlo simulation is proposed....
This paper is based on a project work of the course ldquoPower Engineering Design Projectrdquo given by the Division of Electric Power Engineering, Chalmers University of Technology in Sweden in Fall semester, 2008. The project has focused on simulating power system voltage collapse scenarios using Advanced Real-Time Interactive Simulator for Training and Operation (ARISTO) software. The simulated...
Currently several methodologies exist to assess the Responsibilities Assignment Problem in Power Quality. In this paper an experimental setup with two known disturbing electrically and mechanically coupled loads has been used to provide a reference disturbance setup for comparing these methodologies. The results and discussion extracted from this experiment is reported in this paper. The setup offered...
The flexible AC transmission system (FACTS) device has been applied to enhance the controllability of power systems. A new generation of FACTS device called distributed FACTS such as distributed series impedance or distributed static series compensator has recently received increasing interests for power system control and are expected to be broadly deployed. When technology of D-FACTS is being further...
The influence of the imperfect earth on the propagation characteristics of underground single bare conductors and single core insulated cables arrangements is investigated in this paper. The propagation characteristics are derived through the per-unit-length parameters of the conductors, using new expressions for the earth impedance and admittance correction terms. The influence of the earth electromagnetic...
The potential to improve distribution system reliability is a primary motivation behind the development and deployment of microgrids. Previous studies have illustrated substantial reliability benefits of dispatchable distributed energy resources (DER). However, more analysis and new evaluation methodologies are needed for microgrids dominated by limited and stochastic distributed generation (SDG)...
This paper discusses the possibility that high common mode voltages occur in low-voltage distribution due to oscillations between parallel connected EMC-filters. It is shown that such oscillations may occur in the frequency range between 2 kHz to 150 kHz. Simulations and measurements have been carried out with different types of parallel connected power inlet filter, a common EMC Filter, and the circumstances...
The operation of photovoltaic (PV) units connected to the system is characterized by several uncertainties due to the number of running units, the points where these units are sited, the exported power and the injection of harmonic currents. The objective of this paper is to investigate the penetration level of PV units in the low voltage (LV) network. Starting from field measurements a model has...
Static power converters produce harmonics due to the nature of the conversion process. This paper will investigate the effect on the power factor of a sinusoidal and Fryze current reference on a PWM boost type rectifier. It has been shown in previous papers that a Fryze current ref is best. This paper will develop a mathematical model, based on the single sided Fourier expansion. Using this mathematical...
Ancillary Services (Frequency and Voltage Control) are very important for the electric system operation reliability. RTE (Reseau de Transport d'Electricite) has developed a monitoring tool aiming at analyzing measurements (active and reactive power, voltage) at the delivery point of the units. This tool computes indicators and supplies diagnosis information on conformity of the participation of units...
Our study aims at minimization of power not supplied (PNS) under the severe fault condition such as a tripping of transmission lines. In this paper, we propose a new static control method which can minimize PNS by coordinately controlling multiple unified power flow controllers (UPFCs), generators and loads. The proposed method is based on multiple optimal power flow (OPF) calculations, and determines...
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