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.
These days the number of nonlinear loads in power systems is increasing dramatically. These nonlinear loads inject harmonic currents and the voltages. Accordingly, the modeling of these loads and analysis of their effects on power quality has gained much attention. This paper presents harmonic models for residential appliances. The model is based on Norton equivalent technique. The parameters of appliances...
This paper reveals new contributions to the analysis and development of mitigating harmonic distortion devices. Considering the variety of sequential distribution of harmonic current, in the use of passive filters, one can point out the electromagnetic blocking device, which have received particular attention due to its robustness and low cost of installation. In this context, aiming the evaluation...
Harmonics are the by-products of modern electronic devices i.e. nonlinear loads which create harmonics by drawing current in abrupt short pulses, rather than in a smooth sinusoidal manner. Any distribution circuit feeding nonlinear loads will contain some degree of harmonic frequencies. Due to the rapidly increasing number of non-linear loads in distribution systems, the harmonic distortion of the...
In particle accelerator environment, most of the power converters feeding magnet-loads have either thryristorized or diode bridge at their input stage. Loads to these power converters are fixed but they are operated through a wide current range. Such converters being non-linear loads to the mains produce considerable distortion in the supply current. Hereby, results in a poor total harmonic distortion...
Diode rectifiers or thyristor rectifiers are often used to convert AC power to DC power for adjustable speed drives systems. The advantages of these conventional rectifiers are their simplicity and reliability. The drawbacks include the harmonic current distortion, the lack of re-generation and susceptibility to voltage sags. In this study, an auxiliary front-end converter for the adjustable speed...
This paper reports some findings on harmonic measurement at several buildings of Macao. The findings are current harmonic, harmonic current is caused by variable refrigerant volume (VRV) air-conditioning system, harmonic effect on capacitor, even order current harmonic and neutral current harmonic, they are for reference for Macao to set up the harmonic standard limits in the future.
Operation of cement industry with large number of non linear load has an impact on the power quality at the connected electric network. Harmonic distortion is one of the most important phenomena, which affects the plant distribution network as well as grid performance. This paper provides an in depth discussion on harmonic distortion taking place in the cement plant power system. A case study, to...
We report here the first results obtained from a 4.2 kWp PV grid-connected system installed at a secondary school under a Thai national demonstration project on PV grid-interactive systems. The power quality of system output as a function of radiation and its load are monitored. The power quality parameters measured are the complex, active and reactive power, the power factor, the voltage and the...
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.