By Cornelius T. Leondes

It is a 4 quantity series dedicated to the numerous subject of advances in electrical energy platforms research and keep an eye on ideas. The extensive parts concerned contain tranmission line and transformer modelling. The 4 quantity series will specialize in advances in parts together with energy circulation research, monetary operation of energy structures, generator modelling, strength method balance, voltage and gear regulate strategies, and procedure safety

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Additional resources for Analysis and Control System Techniques for Electric Power Systems

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Open control theoretical questions are discussed. First, the steady-state concepts related to the FACTS idea are quite simple. To illustrate the most representative ones, we refer to a two bus power system. Recall that its main purpose is to deliver energy from generator bus MARIJA ILIC 28 # 1 to load bus # 2 . This energy transfer is based on the simple formula that the real power delivered to load P2 is P -4^sinô 2 Λ 1 2 (10) 12 Clearly, P2 could be increased by reducing the inductance of transmission line Xl2, or by increasing the voltage phase-angle difference ô 1 2, for example.

Studying the large-signal response of the system within a longer time interval, say, 1 minute, requires more detailed machine models that reflect voltage changes on the system [47, 48]. Existence conditions for the unique equilibrium following significant changes in both frequency and voltage are not well understood, and the fact that only practical solutions are of interest puts severe constraint on the study of such conditions. An example of the successful use of nonlinear network theory for establishing conditions under which the unique (decoupled) voltage equilibrium exists within prespecified operating limits, can be found in [117].

For the fastest time scale, usually associated with classical transient stability studies, voltage magnitudes are modeled as constants [42]. MODELING AND CONTROL 41 Example 1. In most traditional studies machines are modeled as having a "constant voltage behind a transient reactance". This model is often used for transient stability analysis. It is also used though less frequently, for fast stabilizing control design during the same period, primarily by means of fast valving, breaking resistors and H V - D C link controls [114].

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