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 work is concentrated on transfer of power quality disturbances in active distribution network containing small hydro power plants (SHP). Investigations are based on the dispersed synchronized measurements using power quality recorder installed in the two substations connected to the same medium voltage line. Dynamic aspect of SHP work represented by switching on capacitor banks are tracked in...
Effect of a new parameter of voltage sag, i.e., phase angle jump, on invertors for PV System was surveyed by newly developed Voltage Sag Generator. The generator can reproduce actual voltage sags recorded past, and artificial voltage sag with controlled phase angle jump. It consists of PC, D/A converter and power amplifier. A program generating wave form of sag has been developed and improved considering...
A transformer based voltage sag generator to test renewable energy systems is presented. Design considerations concerning overvoltages and overcurrents during switching action are addressed. Measurement results of a 30 kW laboratory prototype testing a line side PWM converter and a DFIG are presented. Both measurement results for investigations on the transformer based sag generator at the line side...
Renewable energy resources available locally are ideally suited for providing electricity supply in remote areas. This report describes design and layout of a special single phase supply system with high voltage quality and low power electronics expenditure through application of a special quasi-eight-level inverter output voltage shape at four-level-inverter circuit configuration. Simulation results...
Microturbine-generator is suitable for different distributed generation applications. Due to its high speed, it is necessary to use a frequency converter to deliver the power at 50/60 Hz. In this paper, application of Matrix Converter as microturbine-generator interface converter is addressed. In this way, the interface converter becomes more compact due to omission of dc link capacitor (common in...
With the power integrated technology is adopted, the capacity of power system in ships became larger and larger. More and more equipments are connected in the same power mains, and the requirement of system EMC become stricter than before. In such power system, the generator output should not only satisfy the demand of power quality, but its high-frequency effect to environment should also be considered...
Voltage sags from fault or ground fault are the most prevalent disturbances in electrical power system. A recent survey attributes them to 92% of all disturbances. This paper presents the simulation and experimental of 3 phase 4 wire voltage sag generator based on three dimensions space vector modulation in abc algorithm to produce voltage sag for testing electrical equipment. Experimental results...
Voltage sags from fault or ground fault are the most prevalent disturbances in electrical power system. A recent survey attributes them to 92% of all disturbances. This paper presents the simulation and experimental of 3 phase 4 wire voltage sag generator based on three dimensions space vector modulation in abc algorithm to produce voltage sag for testing electrical equipment. The experimental results...
The objective of the CERTS microgrid test bed project was to enhance the ease of integrating energy sources into a microgrid. The project accomplished this objective by developing and demonstrating three advanced techniques, collectively referred to as the CERTS microgrid concept, that significantly reduce the level of custom field engineering needed to operate microgrids consisting of generating...
The paper proposes two automatic voltage controllers for the South Korean power system. Simulation results from detailed Korean power-flow models show that the controllers can provide significant improvements in security, quality and efficiency of power system voltage monitoring and control. Operating within a time scale ranging from tens of seconds to a few minutes, the controllers can act upon voltage...
If distributed generation is to become a significant source of energy in the future, it will have to work in conjunction with the transformers supplying the distribution network to provide adequate voltage quality for customers. Current practice is to prohibit distributed generation from actively participating in voltage control. However, this approach does not take full advantage of the capabilities...
This paper proposes the use of a direct AC-AC matrix converter, as an alternative to the DC-link voltage-sourced converter, for wind-turbine induction generators. The matrix converter provides a smooth transition of the generator speed through its synchronous speed and therefore, variations of the wind speed can be followed by the generator in a smooth fashion. Thus, the generator provides a high...
Electrical conversion system for permanent magnet wind generators is challenging due to the large rating of power electronics devices needed and the associated costs. Additionally, due to the large inductance present in the generator (synchronous reactance), voltage drops results with resistive load and the generator output power is limited. A solution utilizing an active series compensation device...
In this paper a new 3-phase voltage disturbance generator is proposed. Voltage sag, swell, outage, and unbalance can be provided by the proposed scheme. The main devices of the proposed generator are SCR thyristors, sliding type autotransformers, and transformers. Therefore, the generator has good features of high reliability, high efficiency, and low cost implementation with simple structure. Furthermore,...
This paper reports on the simulation of a marine Integrated Electric Full Electric Propulsion (IFEP) system to assess its ability to absorb variations in propulsion or auxiliary load without excessive degradation of the electrical supply quality or imposing excessive demands on the prime movers. IFEP systems are expected to yield economic benefits to ship operators by permitting the capacity of ship...
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.