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 introduces the unified equivalent circuit model for modular high voltage(HV) power generation architectures. The HV generation architectures are introduced considering the modularity of key HV components such as transformers or rectifier circuits firstly. An equivalent resister and capacitor circuit network is adopted to model the HV transformer and multi-stage voltage multiplier circuit...
With the depletion of fossil fuels and skyrocketing levels of CO2 in the atmosphere, renewable energy sources continue to gain popularity as a long-term sustainable energy source. However, two major limitations exist that prevent widespread adoption: variability of electricity generated and cost of the equipment needed. A grid-tied photovoltaic (PV) / wind hybrid system with battery back-up can help...
Oscillatory nature of the ocean waves lead to intermittent power generated by the wave energy converters (WECs). As a result, WECs face a major barrier for grid integration. The recently introduced undersea storage system (USS) offers a viable solution to overcome this barrier by smoothing the WEC output power fluctuations. Another, but related, issue is that since the output voltage of WECs are relatively...
This paper presents results of the control of a magnetic gear integrated permanent magnet synchronous generator (MG-PMSG) using a dedicated power conversion system to deliver power from an oscillating, low speed wave energy converter (WEC). The generator has two rotors and one stator. By magnetic gearing, the low speed of the outer rotor is amplified to the high speed of the inner rotor, which faces...
A magnetically geared machine (MGM) integrates a magnetic gear with a low torque, high speed electric machine to create a single compact high torque, low speed device with the size advantages of a mechanically geared system and the reliability of a direct drive machine. This work investigates the use of MGMs for wave energy conversion through the development of a large scale magnetically decoupled...
The paper deals with a high efficiency boost rectifier for high rotational speed Gen-Set applications. It is tailored around a permanent magnet synchronous generator (PMSG) featuring an open end winding configuration. According to such a configuration the generator stator windings are connected on one side to a three level T-type unidirectional rectifier, and on the other side, to an auxiliary two-level...
With rapid increase of photovoltaic (PV) penetration in distribution system, and the fact that distributed generators may involve in voltage regulation according to IEEE standard 1547, it is necessary to check the stability of PV generator integration, especially utility PV farms. To apply generalized Nyquist Criteria (GNC) based on impedances on D-Q frame, output impedances of PV farm is derived...
This paper introduces a new configuration of wind turbine drivetrain that collects energy from two interconnected wind turbines. Hydrostatic transmission is utilized to collect the energy and transfer it to a ground-level generator. A mathematical model of the system is obtained and utilized in the control of generator speed and tracking of the maximum power point. Variable displacement pumps and...
The paper analyzes the capability of synchronous reluctance generators to achieve successful self-excitation when operating in stand-alone systems. To initiate the self-excitation process, the machine steel core has to retain sufficient residual flux during the generator start-up. This residual flux depends on the magnetic properties of the machine core as well as the previous machine operating condition...
In this paper, reluctance synchronous machines are designed and optimised to operate in the 5 MW power range for the implementation as wind generators. It is shown, when assuming no rotor deformation, that reluctance synchronous generators can be comparatively designed to operate in this power range with power factors higher than 0.8 achieved. In order to further improve the machine performance, an...
In designing a human-computer interface (interface for short) for a complex work domain, the first question to be answered is what information should be presented on an interface media. The simplest answer is: it depends on tasks to be performed by the human operator. In the past two decades, two methodologies have been developed with a purpose to answer this question, namely Abstraction Hierarchy...
Undeniably, the focus of several works revolved around finding a process of unification to follow along the modeling of mechatronic systems. This paper is a part of a general research designed to apply topology for the modeling of complex mechatronic systems. Notably, a topological approach to model a Wind Turbine is adopted in this study. The Wind Turbine model under study is modeled using a topological...
The design of electrical systems with renewable and conventional in-house generation involves economic, environmental and technical aspects. Often these instances are conflicting: conventional sources have lower Capex and good controllability, while renewable sources have lower Opex and are environmentally friendly but often present erratic behaviors. For these reasons, the best design solution is...
In this paper, we investigate the cryptanalysis of stream ciphers, and evaluate the enhancement to security that can be gained when the ciphertext is error prone by analyzing specific attack algorithm. The stream ciphers that we investigate here have a keystream generator that is based on linear-feedback shift registers (LFSRs). In particular, we characterize the security of these ciphers when the...
There are a number of factors that may affect the validity in measuring radiated emission test parameters in electromagnetic compatibility (EMC) testing. This research observes the effect of the placement of video pattern generator on the validity of measurement results of radiated emission parameter. The radiated emission measurement with the location of video pattern generator inside and outside...
A vehicle parked in the open will experience an increase in temperature in the cabin that can rise quickly in blistering conditions. As a result, the temperature in the cabin will have a temperature difference with outside temperature up to 30 degrees Celsius, thus causing uncomfortable conditions for the driver or passenger if entered the cabin. By utilizing thermoelectric modules that work with...
The Sumba smart microgrid project was built in 2012 as a research means to demonstrate PV power plant integration into utility grid that implemented modern control and information technology to reduce effects of intermittency PV output. It consists of PV, battery, diesel generator, and SCADA subsystem. Since battery subsystem had a problem in its PCS system then some changes in compensation algorithm...
The high utilization and exploitation of fossil fuel have adverse environmental impacts and efforts to overcome these problems are called for. One of the options is to replace fossil fuel with palm oil which has many similar characteristics with diesel fuel. However, palm oil has higher viscosity level than diesel oil which may cause imperfect atomization in the nozzle. As a result, a heater is needed...
The value of sub-transient reactance depends on the design of damper winding or amortissuer. All synchronous generators have sub-transient reactants even though it does not have damper winding physically. The damper winding can contribute to reduce the sub-transient current when generator in fault condition. The generator quantitative parameters are used to perform the simulation using MATLAB/Simulink...
This paper presents the implementation of a sensorless vector control scheme for a surface mounted Permanent Magnet Synchronous Generator (PMSG)-based Wind Energy Conversion System (WECS). This sensorless strategy is based on a sliding mode observer and a minimum order observer, which are used for estimating the position and the speed of the PMSG, respectively. The proposed sensorless scheme does...
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.