Results 261 to 270 of about 275,100 (301)

Unbalanced Three-Phase Optimal Power Flow for Smart Grids

IEEE Transactions on Industrial Electronics, 2011
Advanced distribution management system (DMS), an evolution of supervisory control and data acquisition obtained by extending its working principles from transmission to distribution, is the brain of a smart grid. Advanced DMS assesses smart functions in the distribution system and is also responsible for assessing control functions such as reactive ...
Bruno, Sergio, Lamonaca, Silvia, Rotondo, Giuseppe, Stecchi, Ugo, LA SCALA, Massimo   +4 more
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Power quality improvement of unbalanced power system with distributed generation units

2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT), 2011
This paper presents a power electronic system for improving the power quality of the unbalanced distributed generation units in three-phase four-wire system. In the system, small renewable power generation units, such as small PV generator, small wind turbines may be configured as single phase generation units.
Y Hu, Z Chen, P Excell
openaire   +3 more sources

Instantaneous power quality compensation analysis of unbalanced power systems

8th International Conference on Power Electronics and Variable Speed Drives, 2000
The paper reports the investigations into the compensation of reactive power and harmonics using power electronic techniques based on the generalised instantaneous power theory. The characteristics of the decomposed generalised instantaneous power waveforms are analysed with reference to the balanced and unbalanced, linear and nonlinear power systems ...
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Load modeling for unbalanced harmonic power flow studies

8th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.98EX227), 2002
This paper analyses the load harmonic modelisation under unbalanced conditions. It presents a harmonic characterization of linear three-phase loads (three-phase P-Q consumptions) for different impedance configurations and analytical models for an ideal six and twelve-pulse converter supplied by unbalanced voltages, too.
L. Sainz, J. Clua, O. Jordi
openaire   +1 more source

Power Analysis in Two-Level Unbalanced Designs

The Journal of Experimental Education, 2010
Previous work on statistical power has discussed mainly single-level designs or 2-level balanced designs with random effects. Although balanced experiments are common, in practice balance cannot always be achieved. Work on class size is one example of unbalanced designs.
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Apparent power and power factor concepts in unbalanced and nonsinusoidal situations

2003 IEEE Bologna Power Tech Conference Proceedings,, 2004
This contribution discusses the concept of apparent power and the related concept of power factor in general, sinusoidal and nonsinusoidal, polyphase, balanced and unbalanced situations. In the classical case of single-phase sinusoidal voltage and current the apparent power and the power factor are defined by a quantitative (mathematical) expression ...
J.L. Willems, J.A. Ghijselen
openaire   +1 more source

Control of unbalanced three-phase power electronic systems

Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129), 2000
This paper examines the control of unbalanced three-phase three-wire power electronic systems. The definition of the control strategy for the unbalanced three-phase system is based on the equivalent two-phase unbalanced-coupled model. The control strategy proposed is derived from the double controller scheme that employs one controller for the positive
R.O. de Carvalho, C.B. Jacobina, A.M.N. Lima, E.R.C. da Silva   +3 more
openaire   +1 more source

Thermal Modeling of Power Transformers with Unbalanced Loading

2018 IEEE PES/IAS PowerAfrica, 2018
The weakening of transformer insulation is linked to the thermal stress, which is mainly determined by the loading conditions. Most faults cause changes in the thermal behavior of the transformer. Thus, a comprehensive thermal model and accurate estimation of hot spot temperatures are necessary for transformer condition assessment. A thermal-electrical
Edwell. T. Mharakurwa, George. N. Nyakoe, A.O. Akumu   +2 more
openaire   +1 more source

Direct power control system under unbalanced network voltage

2011 International Conference on Electrical and Control Engineering, 2011
Based on the mathematical model of the three-level PWM rectifier, its power mathematical model was obtained by combining with instantaneous power theory. And the power expression was obtained by analyzing the rectifier under unbalanced network voltage. On this basis, the DPC-SVM control strategy to restrain the negative sequence components of the three
Zhangfei Zhao, Yaofei Han, Xiaohong Fan
openaire   +1 more source

Three-Phase Active Power Filter under Unbalanced Condition

2005 IEEE International Symposium on Circuits and Systems, 2005
A capacitor clamped voltage source inverter for active power filter operation under the balance and unbalance conditions is proposed to suppress current harmonics and compensate the reactive power generated from the nonlinear loads. Two control loops are used in the control scheme to achieve harmonic and reactive current compensation and to regulate ...
null Bor-Ren Lin, null Chun-Hao Huang, null Zheng-Zhang Yang   +2 more
openaire   +1 more source