## Monday, August 6, 2018

### Operation And Controls In Power Systems

Introduction
Power system engineering is a branch where practically all the results of modern control theory can be applied. Such an application will result in economy, better quality of service and the least inconvenience under abnormal situations, both anticipated and unforeseen. Control system design, in general, for its analytical treatment, requires the determination of a mathematical model from which the control strategy can be derived. While much of the control theory postulates that a model of the system is available. It is also necessary to have a suitable technique to determine the models for the process to be controlled. Thus, it is required to model and identify power system components using both physical relationships and experimental or normal operating data. The objective of system identification is the determination of a mathematical model characterizing the operation of a system in some form. The available information is either system outputs or some functions of outputs which may contain measurement noise. The inputs may be known functions applied for the purpose of identification, or unknown functions which it may be possible to monitor somehow, or a combination of both. The identified model may be in the form of differential equations, difference equations, transfer functions, etc. Even though all systems are nonlinear to some extent, the assumption of a linear model leads to simpler models which can yield meaningful results with fairly good accuracy. A system may be classified as stationary or non stationary. During the period of operation, when controls are implemented, the system is normally assumed to be stationary. The system equations may be formulated either in the continuous mode or in the discrete mode. While measurements and predicted values are available at discrete intervals, continuous representation is the most familiar mode. Transformation from continuous to discrete formulation is a straight forward process.

Content :-

• Economic Operation of Power Systems
• Unit Commitment
• Control of Interconnected Systems
• Voltage and Reactive Power Control