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.
Load transients are often the cause of power failures leading to blackouts or malfunction of sensitive equipment on-board electric ships. Having number of operating modes, hybrid electric ships face the same issue at a higher probability. This paper focuses on assessing the effects of load changes on hybrid electric ship power systems at different operating modes. Hybrid electric propulsion and the...
In this research, ant colony algorithm for proportional plus integral (PI) optimal tuning to design load frequency controllers is introduced. A mathematical model of a network with DFIG based wind turbine in two area frequency control is developed. Time domain simulations of the various interconnected power system areas subjected to major disturbances are investigated. A method to enhance the system...
In the quest for reliability and automation, the entiresmart grid operation and control depends on the communicationinfrastructure. This reliance on the information and communicationtechnologies has also opened up possibilities of cyberintrusions. In this paper, a bid modification attack on the powerexchange server is presented with the aim of gaining monetarybenefits in the real-time power market...
The unit commitment (UC) problem aims to find an optimal schedule of generating units subject to the demand and operating constraints for an electricity grid. The majority of existing algorithms for the UC problem rely on solving a series of convex relaxations by means of branch-and-bound or cutting-planning methods. In this paper, we develop a strengthened semidefinite program (SDP) for the UC problem...
Electricity markets of many countries, which are in developing phase, are facing problems like frequency fluctuations, generation deficiency and their performance is very sensitive to small disturbances. Operation of such power system is a challenging task and innovative strategies are required to get rid of these problems. Power utilities of India have introduced new tariff mechanism, Availability...
According to no free lunch theorem, a single search technique cannot perform best under different conditions. The integration of principally similar search techniques is one of the option, that has been explored to effectively investigate the search area. In order to avoid stagnation at local minima and to enhance the search capability of particle swarm optimization, this paper proposes a technique...
This paper incorporates plug in hybrid electric vehicles (PHEV) with thermal unit commitment problem. The integration of PHEV can significantly enhance the reliability of power system operation. When there is enough amount of renewable energy (solar and wind) on a particular day that can be stored through PHEV and whenever there is crisis of power during peak load the same power can be inject to grid...
The power management system (PMS) is designed for full automation of any power plant. The power management system (PMS) is plays a crucial part of the automation and power systems on marine vessels as well. The PMS controls the power system in such a way to maximize the blackout prevention and minimize the fuel consumption in marine vessels. It also serves to decrease the maintenance costs through...
As more electric aircraft power systems grow in complexity and power rating, the design, evaluation and testing of such systems become quite challenging tasks, while real-time simulator based hardware-in-the-loop (HIL) technique is considered a cost/time-effective solution. This paper applies RT-LAB to real time simulation for aircraft electric power system (EPS) with hardware Bus Power Control Unit...
In this paper, we present a distributed economic dispatch strategy for a large-scale power system. At first, we treat each generator and load in the grid as an "agent". By decomposing the centralized optimization into optimizations at local agents, a scheme is proposed for each agent to iteratively estimate a solution of the optimization problem in a distributed manner. Due to the large...
More electric aircraft (MEA) include higher power ratings and more power electronics than conventional aircraft. With electrification comes increased multi-physical interaction between power systems, especially in electrical and thermal domains. It is desirable to develop an accurate and fast systemlevel model that captures the dynamics of multiple energy domains over the course of candidate mission...
The installed capacity of photovoltaic (PV) generation in Japan is currently more than 20 GW. This capacity has been rapidly increasing since the start of the feed-in tariff policy in 2012. The installed capacity after 2030 may be considerably larger than the current supposition if this trend continues. In this study, we conducted numerical simulations of the demand and supply operation with consideration...
This paper develops a conversion function and method transforming from daily peak load curve used LOLED [days/year] to hourly load curve used LOLEH [hours/year] firstly. The indices can not only be conversed just arithmetically but also have different characteristics physically because of using their different load curves. The conversion function is formulated as variables of capacity and forced outage...
This paper presents a probabilistic interval optimization (PIO) model for evaluating the problem of optimal power flow considering wind power integrated (OPFWP). In PIO model, the wind power is deemed as a probability interval variable to assess its profit and risk simultaneously. To be precise, the profit is manifested by the net decrease of generation cost between the same power system with and...
Frequency control in interconnected electrical power systems is nowadays realized using the networks' conventional thermal power plants. With the ongoing changes in power systems worldwide the share of these conventional power plants is decreasing while renewable resources such as wind power and photovoltaics are increasing their share continuously. Up to now a contribution of renewable sources to...
A method for defining the inertia constant of a generating unit is proposed. It is based on a synchrophasor measurements approximation using the generator rotor swing equation. The input includes the measurements of the generator active power and rotor angle during electromechanical transients. The approach was validated by means of a mathematical simulation, experiments on the physical model and...
This paper details a new method of technical condition diagnostics of a ship electric power plant (EPP). The method is based on presenting the EPP as an abstract dynamic system, the operation of which involves system state transition under the effect of external and internal disturbances. A ship EPP diagnostic algorithm has been developed that enables locating faults of the power plant elements with...
This document presents demand energy response optimization in residential sector which energy required for demand supply is provided by electric system, which may have distributed generation, demand optimization objective is to flatten the demand peak curve, thus this promotes energy maintenance by users without producing comfort affections, for which an storage energy system through batteries is...
To localize incidents such as generator trips or load shedding, which cause transients in power systems, a technique from seismology is used in this paper: triangulation by means of information from Phasor Measurement Units (PMU). The synchronized observation of frequency change arrival times, which represent an electromechanical disturbance propagation, allows to approximate the disturbance location...
The main objective of safe and economical operation of electric power systems is to arrange the generator set to put into operation and finally minimize the total cost while meeting certain load demand. The objective of this paper is to minimize the sum of the cost of power generation and the cost of start-up. The primal dual interior point method (PD-IPM) can effectively solve the continuous optimization...
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.