Using MatLab-Simulink for simulating load compensation in four-wire electrical power systems
08 Nov 2004-pp 249-254
TL;DR: In this paper, a method of power factor control and correction of the unbalanced currents in four-wire electrical circuits is described based on the insertion of two compensation networks, one wye-grounded neutral and another in delta, in parallel with the load.
Abstract: This work describes a method of power factor control and correction of the unbalanced currents in four-wire electrical circuits. This method is based on the insertion of two compensation networks, one wye-grounded neutral and another in delta, in parallel with the load. The mathematical development has been proposed in previous work. In this paper, however, the method has been adapted to accept generic power factors for the system to be compensated. On the other hand, the determination of the compensation susceptances is based on the instantaneous values of the load currents. The results are obtained using the MatLab-Simulink environment and the validation of the achieved results are verified.
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16 Oct 2006
TL;DR: In this paper, a bibliography of flexible AC transmission systems (FACTS) for the years 2004 and 2005 is presented, where the authors present a detailed discussion of the characteristics of each system.
Abstract: This paper presents a bibliography of flexible AC transmission systems (FACTS) for the years 2004 and 2005.
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References
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TL;DR: In recent years, there has been a rapid increase in the number of thyristor-controlled shunt compensators used in industrial and utility systems for dynamic power factor correction and terminal voltage stabilization as mentioned in this paper.
Abstract: In recent years, there has been a rapid increase in the number of thyristor-controlled shunt compensators used in industrial and utility systems for dynamic power factor correction and terminal voltage stabilization. These thyristor-controlled shunt compensators function as variable reactances operated in both the inductive and capacitive domains.
293 citations
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207 citations
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TL;DR: In this paper, a reactive power compensation method is developed to reduce the negative and zero sequence components of load currents and to improve the load bus power factor of unbalanced three-phase four-wire distribution feeders.
Abstract: A new reactive power compensation method is developed to reduce the negative and zero sequence components of load currents and to improve the load bus power factor of unbalanced three-phase four-wire distribution feeders. Negative and zero sequence currents may cause additional losses and damage to power systems. Load compensation at the load bus is an effective method to eliminate those undesired sequence currents. The compensation technique uses a Y-connected and a Delta -connected static reactive power compensators (SVCs) to give a different amount of reactive power compensation to each phase. The compensation formulas are very suitable for on-line control by measurement of phase voltages and currents in real time. The compensation effect can also be achieved even if one leg of the SVCs is out of service. In addition to balancing effect and power factor improvement at the load bus, the SVCs can also be used to support the load bus voltage and to maintain the substation feeder at unity power factor. Digital simulations are made with the load data measured from an 11.4 kV secondary substation feeder. >
71 citations
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TL;DR: In this paper, the authors proposed an improved technique for modeling of an electrical distribution system in the presence of incomplete information, which only requires annual peak loads for each feeder and substation which are readily available.
Abstract: This paper proposes an improved technique for modeling of an electrical distribution system in the presence of incomplete information. By considering the different behavior and coincident factors of commercial and residential loads, this paper formulates a ratio factor technique to acquire an improved power-flow model. A load distribution relationship between the entire load and less than 50% of the total load on a feeder is also formulated. The technique only requires annual peak loads for each feeder and substation which are readily available. In addition, the method uses the results of the conventional technique and produces better results through a set of simple computation. It is shown that the accuracy of the new technique is significantly better than the traditional technique. >
31 citations