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Seifi H.,Iran Power System Engineering Research Center | Seifi H.,University of Tehran | Sepasian M.S.,University of Tehran
Power Systems | Year: 2011

Over the years, voltage performance of a power system has received attention from both analysis and improvement points of view. Although voltage magnitudes are, normally, of main concern, during the last, perhaps, two decades, voltage stability is also received attention in literature. In this section, we try to briefly, differentiate between these two aspects of voltage performance of a system. Following that, we review some of the indices which may be used for each case. © Springer-Verlag Berlin Heidelberg 2011. Source


Seifi H.,Iran Power System Engineering Research Center | Seifi H.,University of Tehran | Sepasian M.S.,University of Tehran
Power Systems | Year: 2011

Suppose one of our choices is to use a 400 kV line with 1/5 per unit reactance and 1/16 per unit resistance (per km) of the respective values of an available 230 kV line. In terms of the susceptance, it is assumed that B of the 400 kV line is 2.5 times that of the 230 kV line. Moreover assume that its thermal capacity is three times higher than that of the 230 kV line. © Springer-Verlag Berlin Heidelberg 2011. Source


Seifi H.,Iran Power System Engineering Research Center | Seifi H.,University of Tehran | Sepasian M.S.,University of Tehran
Power Systems | Year: 2011

With electric power consumption growth, desired new transmission system elements are needed to overcome the possible lack of adequacy problems so that with the least costs, various operational constraints are met. In the so-called Substation Expansion Planning (SEP), the problem is to determine the required expansion capacities of the existing substations as well as the locations and the sizes of new substations together with the required availability times, so that the loads can be adequately supplied. © Springer-Verlag Berlin Heidelberg 2011. Source


Seifi H.,Iran Power System Engineering Research Center | Seifi H.,University of Tehran | Sepasian M.S.,University of Tehran
Power Systems | Year: 2011

Various aspects of power system planning were covered in Chaps. 4-10. Planning in the presence of uncertainties was addressed in Chap. 11. We discussed there some basic concepts appearing in power system planning literature. In this chapter, we are going to cite some references; addressing research trends in power system planning. © Springer-Verlag Berlin Heidelberg 2011. Source


Seifi H.,Iran Power System Engineering Research Center | Seifi H.,University of Tehran | Sepasian M.S.,University of Tehran
Power Systems | Year: 2011

In this chapter we are going to talk about load forecasting, as one of the basic and perhaps the most important module of power system planning issues. Although some other words, such as, demand and consumption are also used instead of load, we use load as the most common term. The actual term is electric load; however, electric is omitted here and assumed to be obvious. It is well understood that both the energy (MWh, kWh) and the power (MW, kW) are the two basic parameters of a load. By load, we mean the power. However, if energy is required in our analyses, we will use the energy demand or simply the energy, to refer to it. Obviously if the load shape is known, the energy can be calculated from its integral. © Springer-Verlag Berlin Heidelberg 2011. Source

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