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.
In this paper, we design a controller using H infinity control theory and examine its frequency fluctuation suppressing performance in a small-scale system composed of real machines. The introduction of distributed power sources such as solar power generation and other sources of natural energy into smart power grids has been increasing in recent years. However, given that the amount of power generated...
Pulsed power loads present a difficult scenario for ship power systems to handle. Loads such as radar or energy weapons often demand a large amount of power in a short amount of time. This creates issues for the generators that supply the power to these loads due to the ramp rate constraints. By incorporating energy storage and combining the energy producers and users into a single power system, the...
In this paper, a reconfiguration method based on Model Predictive Control (MPC) is proposed for a nonlinear Medium-Voltage DC Shipboard Power System. By applying the proposed MPC approach, the reconfiguration is formulated as an optimization problem with respect to operating constraints and also the priorities of loads. The loads are categorized as vital loads, semi-vital loads, and non-vital loads...
In a large ship, Power Management System (PMS) which manages power system should be tested in various operating conditions and fault situations. During its function tests, the PMS should be connected to the ship's power system. However, the test has limitations due to cost, test condition and safety. In this paper, a control Hardware-in-the-Loop Simulation (HILS) system is proposed for the function...
In this study, we analyzed the operational situation and cost for Tokyo Electric Power Company's service area by 2030, when a high penetration of variable renewable energy (VRE) sources will have been attained. Day-ahead unit commitment and real-time economic dispatch simulation were carried out by taking into account photovoltaic power yield forecasts and errors. The analysis allowed us to evaluate...
Nodal pricing or LMP is one option to deal with congestion in the distribution grids that are expected due to the emergence of electric vehicles. When optimal power flow (OPF) with losses is used to determine optimal dispatch and locational marginal prices (LMP) of a power systems, the prices include marginal losses. Marginal losses are double the amount of the real physical losses. This leads to...
Current models of capacity market designs in the U.S. and elsewhere ignore the important issue of carbon emission produced by power generators. While the current designs may produce optimal and efficient capacity market prices, these designs contribute little or nothing to reduce such emission. In this paper, we present a novel alternative to the current capacity market design which can realistically...
State of power system is often determined by taking simultaneous measurements across the grid. However, in developing countries with geographically expansive grid, if the measurements are not GPS time-stamped there are latencies owing to distance of sensor from control center or communication system performance. The latency and resulting time-skews in data fed as input to state estimator program may...
In a hydro-dominated power system, with complex inter-temporal linkages, capacities of individual projects and project configurations are more complicated than using the simple megawattage, often used to denote capacity in thermally dominated systems. In this paper, the long term hydro scheduling problem is solved and used to test novel definitions of hydro-capacities, based on expected cost and cost...
On the basis of analyzing of ship high voltage power system, established the ship diesel engine, ship high-voltage synchronous generator, excitation controller and load mathematical model, etc. The Matlab/simulink software was used to establish mathematical model and simulation, under sudden reduce and heavy load conditions, obtained the data of ship high voltage power system, including the synchronous...
In this paper, we consider a distributed load control problem for achieving supply-demand balance and frequency regulation in a power system. While most of the distributed load control schemes require the loads to exchange information through two-way communications, recent results have shown that it is possible to achieve fully distributed control by frequency-based imbalance estimation. However,...
Modelling and simulation of emerging DC shipboard power system (SPS) is required to validate the hardware design, converter control and protection algorithms. As DC SPSs may be large and complicated, the simulation of such systems using high fidelity models generally consumes much time and the validation of performance using multiple test scenarios becomes impractical. An alternative method is to...
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...
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...
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...
Power system operators have traditionally addressed system uncertainty through the scheduling of operating reserves. These reserves are excess capacity, either online or offline, that can quickly be used to address unforeseen events in the load profile. As renewable energy resources, namely wind and solar, new techniques are being developed to address the uncertainty introduced from these sources...
Wind energy is widely considered as a major source of clean energy. As such, wind turbines are becoming popular in the renewable energy world. The output of the wind turbine varies with randomly changing speed of the wind. This is a critical problem for wind turbines in general, and fixed speed wind generators in particular. However, conventional pitch controllers and governor control systems are...
With increasing size and unit capacity of photo-voltaic power generation, the impacts of photovoltaic generation on the power system have become increasingly prominent. This paper presents one methodology to evaluate the impact of photo-voltaic generation in the random production simulation. The algorithms used to solve probabilistic production simulation is equivalent energy function method. Which...
The European Union continues to exert a large influence on the direction of member states energy policy. The 2020 targets for renewable energy integration have had significant impact on the operation of current power systems, forcing a rapid change from fossil fuel dominated systems to those with high levels of renewable power. Additionally, the overarching aim of an internal energy market throughout...
The present paper presents an analytical model for the evaluation of short-term frequency response in isolated power grids with increasing penetration of renewable energy sources. The analysis includes synthetic inertia and primary frequency control schemes proposed in the literature for wind power plants. Thus, frequency response in future insular scenarios can be estimated. The analytical model...
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.