The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper investigates three polynomial strategies in damping oscillations in a horizontal axis turbine plant power systems, to demonstrate the influence of the introduction of the STATCOM in the power system, a comparative study is implemented using various polynomial algorithm control approaches to a horizontal wind axis turbine power system incooperating a static synchronous compensator (STATCOM)...
An active switching total harmonic distortion (THD) reduction topology is proposed in this paper. The topology is used to reduce the harmonics and to correct the power factor of the grid for electric vehicle (EV) charging station applications. The proposed topology is implemented by proper control of the bi-directional cascaded buck-boost converter switches. The need for passive filters or additional...
In the real time operation of a Regional Transmission Organization (RTO), the generation resource commitment plans are constantly revised for the look-ahead time horizon due to changes in system operating conditions. Optimization based resource commitment algorithms can most effectively help to minimize the costs of committing new resources. However, most optimization algorithms lack transparency...
A time-varying transfer function model for Li-ion batteries is introduced in this paper. Because of its time-varying nature, the proposed model is capable of capturing the charging process better than conventional time-invariant transfer function models. The overall modeling process constitutes a three-step process, namely, estimation of a continuous time-varying model, segmentation of the model parameter...
The potential to harness offshore wind power and transmit that energy to shore is of widespread interest in the electric power and energy industry sector, as well as within U.S. government agencies such as the Department of Energy. Studies are currently being conducted to find optimal placement of offshore wind turbines along the perimeter of the United States coast lines, and evaluations of current...
Global use of solar energy and wind energy will provide clean energy for sustainable global economic growth. The use of photovoltaic systems for DC power generation and the delivery and the utilization of DC power will bring revolution in energy field by providing ultra-low-cost clean energy to rich and poor all over the world. Ultra large scale manufacturing of PV modules coupled with wide band gap...
Spatial and temporal characteristics of the wind velocity in complex terrain, relevant to wind energy resources were investigated in this study. Data from one 80 m and four 50 m towers located within a range of 200 km in western Nevada, U.S., operated from August 2003 to March 2008 were used in the analysis. The average multi-annual wind speed did not show significant increase trends with increased...
Today's power systems are undergoing an evolutionary transformation where novel sensors, organized as sensor networks, are providing tremendous amounts of real-time data that is useful for improving situational awareness. It is becoming increasing evident in large-scale power systems, as in many other applications, that the associated big data is both an opportunity and a challenge. In this paper...
To optimize and extend the lifetime of photovoltaic (PV) modules, a better understanding of the modes and rates of their degradation is necessary. Lifetime and degradation science (L&DS) is used to better understand degradation modes, mechanisms and rates of materials, components and systems in order to predict lifetime of PV modules. Statistical analytic methods were used to investigate the relationships...
Renewable energy sources (RES) will play a major role in future energy systems. Political RES goals are only defined in terms of targeted capacity or energy. This paper presents an approach to calculate the corresponding optimal location of RES generation. Potential areas for the expansion of the considered generation technologies (wind onshore and offshore, photovoltaics and concentrated solar power)...
In the past, most of the operating strategies of energy harvesting devices focus only on the resonant frequency of its first mode. The resonant frequency in this mode is fine tuned with an attached proof mass. This paper presents a new approach of operating energy harvesting devices in different vibration modes. With this operation strategy, the harvested power can be increased. The resonant frequencies...
Nowadays some nuclear power plant in Japan is shut down due to problem of security in earthquake disaster. Consequently, Japan will encounter a lack of electrical energy in the future if new electrical generation is not constructed. Solar energy is one of appropriate renewable energy for Japan. Solar panel produces electrical energy by using the natural solar radiation from sun. PV Solar farm consists...
With an increasing market share of electric vehicles (EVs) the question of additional electricity demand and its effects arises. In this context, smart charging of EVs is discussed. This paper investigates the optimization of charging strategies with cost as objective function. Thereby, battery constraints regarding the charging process are taken into account. The problem is formulated as a mixed...
A key task of smart meters is to securely report the power consumption of households and provide dynamic pricing to consumers. While transmission to all meters can be performed via a simple broadcast, several challenges are faced during the reporting process. Firstly, the communication network should be able to handle the large amount of load reports, and secondly, the privacy of the load report should...
Demand Response (DR) technology makes it possible to have two-way communication between service providers and home appliances inside the customer premise. This state-of-art technology is equipped with smart meters, load control devices (smart devices), smart thermostats, smart switches and home energy consoles. Furthermore, DR technology can help us to modernize our electricity system and provide...
The dv/dt switching limitations of power semiconductor devices in a boost DC-DC power converter are evaluated using circuit simulations and accurate circuit simulation models. State-of-the-art commercial silicon CoolMOS devices, commercial Silicon Carbide (SiC) power Schottky Barrier Diodes (SBD??s), and emerging Gallium Nitride (GaN) power transistors are considered. It is shown that although SiC...
To assess the impact of intermittency of rapidly increasing solar photovoltaic (PV) generation on the grid, this paper presents the dynamic models of PV generation system, the battery energy storage system (BESS) and their associated control systems. The interfaces between these models and the mains grid are also provided. Using such dynamic models, the cloud transient impacts at different penetration...
This paper proposes a smooth transition control strategy for voltage source inverters between standalone (SA) and grid connected (GC) modes of operation. During transition both current control and droop control will participate in formulating the inverter output voltage but with different weights or coefficients. In transition mode the controller varies the output coefficients of the current and droop...
An energy harvesting prototype is presented to electromechanically convert low grade heat into electricity using shape memory alloy (SMA) actuators. A model is presented for the system, and the relationship between the SMA temperature and the angle of rotation of the generator is experimentally validated. The ability of the SMA energy harvesting prototype to cyclically oscillate is also demonstrated...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.