Model of Speed Governing System - Automatic Generation and Voltage Control - Power System 3

TL;DR

Learn how to model the speed governing system of an alternator, considering the relationship between power output, frequency, and turbine speed.

Transcript

hello friends in this video lecture we are going to learn how to model the speed governing system of a alternator so let us begin so friends in our previous lecture we have discussed the speed governing mechanism for an alternator so today we will learn how to model this speed governing mechanism so before we proceed let us consider that the power ... Read More

Key Insights

• 🐎 The speed governing system of an alternator is modeled by considering the relationships between power output, frequency, and turbine speed.
• 🐎 Lowering the speed changer lever increases steam flow and turbine speed, leading to an increase in generator output.
• 😥 The movements of points A, C, and D are interconnected and affect the position of the steam wall and the speed of the turbine.
• 🐎 The speed governor senses changes in turbine speed and adjusts the steam flow to maintain the desired frequency and power output.

Questions & Answers

Q: How does lowering the speed changer lever affect the turbine speed and generator output?

Lowering the speed changer lever causes point A to move downward, which increases steam flow and turbine speed. This, in turn, leads to an increase in generator output.

Q: What is the relationship between the movements of points A and C?

The downward movement of point A results in the upward movement of point C, as they are connected by a fixed link. This movement of point C affects the position of the steam wall, allowing more steam to pass and increasing power output.

Q: How are the movements of points C and D related?

The downward movement of point C, caused by the movement of point A, results in the downward movement of point D. This movement of point D influences the position of point E, which controls the steam input and affects turbine speed.

Q: How does the speed governor sense changes in turbine speed?

The speed governor is installed on the shaft of the alternator and senses changes in turbine speed. As the speed governor moves outward with increasing speed, it causes the downward movement of point B, which is proportional to the change in frequency.

Summary & Key Takeaways

• The initial condition of the power system is steady, with the linkage mechanisms stationary and the steam wall setting open by a definite value.

• Lowering the speed changer lever results in the downward movement of point A, which causes an increase in steam flow and turbine speed, leading to an increase in generator output.

• The movements of points C and D are influenced by the movements of points A and C, respectively, leading to changes in power output and the position of the steam wall.