Single Machine Infinite Bus in Power System: Figure 12.14 is the circuit model of a Single Machine Infinite Bus in Power System through a line of reactance Xe. In this simple case From Eq. (12.29b) The dynamics of this system are described in Eq. (12.11) as Two Machine System: The case of two finite machines […]
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Power Angle Equation of Synchronous Machine: Power Angle Equation of Synchronous Machine – In solving the swing equation (Eq. (12.10)), certain simplifying assumptions are usually made. These are: Mechanical power input to the machine (Pm) remains constant during the period of electromechanical transient of interest. In other words, it means that the effect of the
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Dynamics of Synchronous Machine: The Kinetic Energy of the Rotor at Dynamics of a Synchronous Machine is where J = rotor moment of inertia in Kg-m2 ωsm = synchronous speed in rad (mech)/s But where P = number of machine poles where M = J (2/P)2 ωs x 10-6 = moment of inertia in MJ-s/elect rad We shall
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What is Power System Stability?: The stability of an interconnected power system is its ability to return to normal or stable operation after having been subjected to some form of disturbance. Conversely, instability means a condition denoting loss of synchronism or falling out of step. Power System Stability considerations have been recognized as an essential
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What is Load Curve?: Load drawn by consumers is the toughest parameter to assess scientifically. The magnitude of the load, in fact, changes continuously so that the load forecasting problem is truly a statistical one. A typical daily Representation of Load Curve is shown in Fig. 1.1. The loads are generally composed of industrial and
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Phasor Diagram of Synchronous Motor: The Phasor Diagram of Synchronous Motor is the most important element of a power system. It converts mechanical power into electrical form and feeds it into the power network or, in the case of a motor, it draws electrical power from the network and converts it into the mechanical form.
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Per Unit System in Power System: Per Unit System in power system is usual to express voltage, current, voltamperes and impedance of an electrical circuit in per unit (or percentage) of base or reference values of these quantities. The per unit value of any quantity is defined as: The Per Unit System in Power System
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Inductance of Double Circuit Three Phase Line: It is common practice to build double circuit three phase Line so as to increase transmission reliability at somewhat enhanced cost. From the point of view of power transfer from one end of the line to the other, it is desirable to build the two lines with as
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Inductance of Composite Conductor Lines: Future 2.6 shows such a single-phase line comprising inductance of composite conductor lines A and B with A having n parallel filaments and B having m’ parallel filaments. Though the inductance of each filament will be somewhat different (their resistances will be equal if conductor diameters are chosen to be
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ACSR Conductor (Aluminium Conductor Steel Reinforced): ACSR Conductor – So far we have considered transmission lines consisting of single solid cylindrical conductors for forward and return paths. To provide the necessary flexibility for stringing, conductors used in practice are always stranded except for very small cross-sectional areas. Stranded conductors are composed of strands of wire,
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