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In modern systems, where many equipment are controlled by electronic devices, power transmission and distribution networks are increasingly turning into “smart grids”. There is the question of the immunity of these equipment to the action of electromagnetic fields generated by other equipment, as well as the immunity of other control and monitoring devices to the action of electromagnetic fields generated...
The paper analyses energy production and consumption recorded for the Romanian power system in selected days and shows how storage resources can mitigate situations with 100% CO2 free and 100% RES respectively, by simulating through scaling the production based on these new scenarios. The study assumes a similar power exchange with neighbors, to avoid drastic network reinforcement and to improve regional...
Electromagnetic shielding is one of the most important concerns of operators from high and very high voltage field, especially those carrying out live work. The electromagnetic field generated by high-voltage overhead power lines and high-voltage equipment may be harmful, especially to those operating these installations. Taking into account the exposure time of workers in the case of maintenance...
At night, accidents are more severe and involve vulnerable people, older people with disabilities, and mothers with children. Increasing the level of illumination in the pedestrian crossing area by optimally dimensioning the associated lighting system leads to the driver being alerted to the presence of a risk area and adapting the speed of movement to avoid any danger. The projected pedestrian lighting...
This paper investigates the voltage fluctuations determined by industry perturbing loads in a power system, with and without a STATCOM device in operation. The monitoring campaign was carried on by simultaneously measuring the voltage fluctuations in various points of the supplying power system, for revealing each perturbing customer contribution, and the background flicker. During the measuring campaign,...
The paper presents aspects related to the connection of renewable sources of energy to the grid and focuses on the Photo Voltaic Power Plant (PVPP). The correlation of this process with Power Quality (PQ) issues and conditions for certification of each plant in accordance with regulations are included in our work as well. Results of measurements of PQ in the Points of Common Coupling (PCC) in the...
This paper compares three possibilities for determining the flicker level generated by industrial customer with arc furnaces: by calculating the electromagnetic perturbations, by experimental measurements, and by simulation using specialized software. The influence of the fault level on the propagation of perturbation in the power system represents a challenging issue studied within the existing context...
The paper presents the impact of connecting Renewable sources to the Smart Grid with regard to improving Power Quality aspects. The impact of integrating renewable sources on Power Quality indices in the grid wes analyzed and the measures for avoiding the negative impact are included in the paper. Challenges coming from the integration of renewables – variability and uncertainty and the correlation...
This paper presents results of power quality monitoring collected from transmission system operator (TSO) and several distribution system operators (DSOs) from Romania. The power quality monitoring system is realized in accordance with actual technologies, economic criteria, performance standards and technical codes issued by the Romanian Energy Regulation Authority (ANRE). The implementation of power...
The present paper deals with the results of one month monitoring campaign of operating regimes of an existing ac arc furnace facility and its impact on power quality. Synchronized measurements were carried on in different points of the supply system of the arc furnace facility. Different supply schemes of the electric arc furnace facility were proposed and implemented, monitoring the power quality...
Two types of Power Quality Monitoring Systems (PQMSs) — one for TSO and other for DSOs, in accordance with Performance standards and Technical Codes of the Romanian Energy Regulation Authority — ANRE were published. The connection to the grid of the renewable sources could determine the increasing of the emissivity of perturbations and the necessity of the propagation study in order to determine the...
In the last years, the conducted studies for connecting renewable energy sources with small installed capacity to the electrical grid highlighted the importance of the grid characteristics and on the technical conditions required for the equipments. The operation of wind farms in the electrical system is restricted by its capacity to absorb the produced power and to ensure the required adequacy. The...
The naval installation has a series of particularities compared to the industrial ones from the ground. Their dimensions are small, lightweight, should be functioning safely, efficiently at lower operating costs to enroll in the overall cost of the ship, to keep the plant competitive. A naval installation includes electronic equipment and the electrical equipment of the layout is loaded close to the...
The paper presents a study of electric field distribution on insulator strings, which are used for suspension of overhead transmission lines of 400kV and are stressed by power frequency voltage. The investigated insulator strings are used on transmission networks of National grid of Romania. The simulation uses the Finite Element Method (FEM) and COMSOL Multiphysics software to carry out the electric...
The paper presents aspects related to Smart Grid observability, Control and Automation by using the Unbundled Smart Meter (USM) concept. To sustain this, the paper provides relevant descriptions of the new Romanian Metering Code, version 2015, outlining the new requirements for the smart meter, according with the rapid evolution of Smart Grids, including renewable energy resources and energy services...
World wide the wind power plants are located far away from the existing interconnection substations to the power system. Therefore, compensation methods are considered for the reactance of long distance cable connection. High voltage DC transmission cables for wind power plants interconnection to the grid can also be considered and used. In the present paper, the problems raised by AC cables, from...
This paper proposes a control system, for crowbar protection and voltage support, for wind turbines equipped with doubly fed induction generator. The control system based on PI controller enables the low voltage ride through capability of the wind turbines. The reactive power control of doubly fed induction generators is mostly achieved by controlling its rotor side converter. The proposed control...
The new paradigm in which the electric power systems are developing, defined as smart systems, have a great impact on the consumers. By adopting distributed generation in an increasing proportion, they are becoming prosumers. The electricity market is therefore undergoing a structural change, in need to address the requirements of the prosumers. The market must address a vast array of topics, ranging...
The smart grid paradigm for the electric power systems is encompassing an increasingly adoption of distributed generation all over the world. This trend requires the input from flexible alternative current transmission systems (FACTS) devices, which can be used to increase transmission capacity, improving stability and dynamic behavior, and ensure a better quality of energy by controlling several...
The paper analyzes the capability of a wind power plant, based on doubly-fed induction generators (DFIGs) with an improved control system, to fulfill low voltage ride-through (LVRT) capability of the wind turbines providing the reactive power support. According to grid code requirements, tripping of wind generators under grid faults is not allowed. The sensitivity of DFIGs to grid faults requires...
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