2011 IEEE Trondheim PowerTech - Conference Table of Contents | IEEE Xplore
Power Tech Conference

2011 IEEE Trondheim PowerTech

DOI: 10.1109/POWERTECH16445.2011

19-23 June 2011

Proceedings

The proceedings of this conference will be available for purchase through Curran Associates.

PowerTech, 2011 IEEE Trondheim

This paper presents a Multicriteria Decision Aid methodology for planning energy storage and sustainable mobility, in an isolated system. The objective of this research is to enhance the sustainability of the analyzed case study (São Miguel Island), by comparing a set of alternatives for energy storage and sustainable mobility. The alternatives characterization and evaluation is made through the c...Show More
The paper describes a monitoring system for the evaluation of the low sag behavior of the overhead conductors in operating lines. The monitoring system measures the conductor tension and temperature and it also measures the wind speed to evaluate the load in the conductor due to wind. This system includes a methodology for the analysis of the measured data and the comparison of these data with the...Show More
The development of the Renewable Energy Source (RES) generation in Europe is lately occurring at a very fast pace under the push of the European energy and climate change policy targets and the consequent incentive schemes applied at national level. At the same time, the electrical borders of the European Countries have recently been opened to host a significant amount of cross-border trade. All t...Show More
Real time monitoring in both electrical transmission and distribution lines is an interesting option for knowing the electrical load level of these lines. The information about the load level allows alleviating the overloaded lines if the power can be transferred to other lines. In this paper, a new ampacity monitoring system for overhead lines, based on the conductor tension, the ambient temperat...Show More
High voltage substations produce strong electromagnetic fields (EMF) in the surrounding areas. People who live close to substations express concern about the possible health risk from the exposure to the EMFs. In this research, EMF characteristics are measured inside two 69 kV substations, and an independent and unbiased assessment of the EMF distribution in the substations is provided. The substa...Show More
Microgrids can be defined as distribution systems with distributed generation (DG) units, energy storages and controllable loads. Microgrids are expected to form an essential part of future Smart Grids with self-healing feature. Most of the time microgrids will be operated normally parallel with utility grid. In addition to this microgrids have a special self-healing capability, because they can c...Show More
Dynamic economic dispatch (DED) is a high-dimensional, non-convex, multi-constrained optimization problem. With the increase of wind power penetration into power systems, the DED problem becomes more difficult. In the mathematical model, the constraints of wind farm output and spinning reserve are proposed to deal with the random and unpredictable nature of wind power. In the power system with lar...Show More
The paper addresses the conventional approaches to the short-term forecasting of nonstationary processes in complex power systems using the methodology of artificial neural networks (ANNs). In many practical cases the application of different ANNs can provide a satisfactory forecast. But data preprocessing and analysis can significantly improve the forecast. In this paper the Hilbert-Huang Transfo...Show More
The paper deals with an optimal choice of statement of the on-line state estimation (SE) problem for electric power systems (EPS). The solutions to the problem should be accurate and the time required to obtain them - fast. The work suggests a combination of dynamic and pseudodynamic algorithms to be applied for EPS state estimation.Show More
Short-term load forecasts are a major concern for transmission system operators. In France, RTE uses a parametric load model fed by temperature and cloud cover data. In this paper, we evaluate how the use of wind data may improve the quality of the model, both for fitting and forecasting. More precisely, the demand of Brittany, the peninsular area in the northwest of France is studied over the 200...Show More
The use of renewable energy source for the transition towards a sustainable future imposes a number of new challenges for the electricity grid, one of them being the balancing of supply and demand. The flexibility in Virtual Power Plants can be used within a Smart Grid to dampen the intermittent behavior of wind and solar energy. In the Dutch Smart Grids pilot “PowerMatching City”, a domestic virt...Show More
A smart grid is an electricity network that uses digital technology to monitor and manage the transport of electricity from all generation sources to meet the varying electricity demands of end users. In this paper, the smart grid is defined as the electric power system consistent with the BASE or BLUE scenarios in the Energy Technology Perspectives 2010 with the large scale renewable integration ...Show More
In the last decades, growing environmental concerns have driven investments in electricity generation projects based on Renewable Energy Sources (RESs) such as Photovoltaic (PV) systems. Off-grid PV systems tend to rely on generation side management measures such as back up generation or storage to provide a supply with an adequate level of reliability. Alternatively, demand-side measures such as ...Show More
The diffusion of Plug-in Electric Vehicles (PEVs), is expected to increase considerably over the next few years. Ad-hoc charging systems interacting in real-time with smart grids will be needed increasingly to overcome the severe overload problems in electric distribution grids caused by the huge demand for energy to charge a large number of vehicles. These systems will have to implement the sched...Show More
In this paper a strategy is introduced for emergency control of Load Tap Changers (LTCs) to prevent the system from voltage collapse. The method is based on the fact that the power consumed by constant current and constant impedance loads can be lowered by decreasing the secondary voltage of the LTC. This idea is used to develop a method of indirect load shedding. This method calculates, based on ...Show More
Synchronized phasor measurements can potentially track the system dynamics between two classical state estimations. However, in the PMU configurations available nowadays and in the near future, those measurements are too scarce for the whole system state to be estimated. Therefore, we investigate the possibility to reconstruct coherent, time-synchronized system states from the available PMU data. ...Show More
Common grounding systems (global earthing systems) are not very clearly defined in standards. One definition of a common grounding system is that no dangerous touch voltages caused by ground fault currents occur. This means that a common grounding system does not depend only on the grounding system itself but also on the type and operation of the electrical grid and the protection schemes. In a re...Show More
Problems as voltage increase at the end of a feeder, demand supply unbalance in a fault condition, power quality decline, increase of power losses, and reduction of reliability levels may occur if Distributed Generators (DGs) are not properly allocated. For this reason, researchers have been employed several solution techniques to solve the problem of optimal allocation of DGs. This work is focuse...Show More
The future distribution networks are going to be challenged by increasing penetration of distributed generators and simultaneously by increasing loading (inter alia heat pumps, air conditioners or electric vehicles). The increasing penetration of those appliances can escalate and jeopardize the functionality of current protection devices. Therefore, this article proposes a new overloading protecti...Show More
This paper presents an approach for reconfiguration and optimal placement and sizing of fixed and automatic capacitors banks in radial distribution systems for the purpose of minimizing real power losses and enhancing the voltage profile. A modified, dedicated Chu and Beasley based genetic algorithm (CBGA) approach has been successfully developed and implemented. It demands low computational effor...Show More
Estimating model parameters is a major challenge in degradation modelling. This paper presents an approach where sojourn time distribution parameters were estimated based on censored observations from condition monitoring. A maximum likelihood approach for parameter estimation is described, and the requirements related to type and amount of data are discussed. It is shown that feasible parameter e...Show More
This article proposes the use of Lagrange multipliers associated with discrete variables of the Thermal Unit Commitment problem as a source of information for the ant colony algorithm. To achieve this, the discrete variables that are inherent to the problem are mitigated through a sigmoid function. By doing so, the non-linear optimization issue is solved through the use of the primal-dual interior...Show More
Despite a widely spread intuition about growing needs for energy storage solutions over the world, there is still no consented scenarios on the requirement for additional storage capacities within main power systems. Besides, storage value assessment and economics are mostly not proven yet in the frame of Smart Grids. The main objective of this paper is to highlight the need for coordinated energy...Show More
One of the challenges of the near future for a more renewable Dutch electricity infrastructure is the embedding of high concentrations of heat pumps in currently built domestic residences. In the Dutch situation demand of electricity occurs simultaneously with demand of heat, high electricity peak loads in the low voltage network are expected. This study focuses on domestic residences with high pe...Show More
This paper is focused on optimizing the distance protection algorithm for series-compensated line. This algorithm requires estimation of three-phase voltage drops across capacitors bank. For this purpose a nonlinear differential equation is solved on-line, applying comparatively low sampling frequency. In order to assure high fidelity of the waveforms reconstruction using the up resampling procedu...Show More

Proceedings

The proceedings of this conference will be available for purchase through Curran Associates.

PowerTech, 2011 IEEE Trondheim