What is load frequency control?
Load frequency control of an interconnected power system means the interconnection of more than one control area through tie lines. Sudden load variation in any control area of an interconnected power system will lead to both frequency change and tie line power deviation.
What is load frequency control and its purpose in the power system?
In an electric power system, Load Frequency Control (LFC) is a system to maintain reasonably uniform frequency, to divide the load between the generators and to control the tie-line interchange schedules.
Which are the control inputs to load frequency control system?
From the block diagram model it is clearly seen that there are two control inputs named u1 and u2. The block diagram below which represents a two area power system model is heaving two control areas connected to each other through a line heaving its own dynamics (block 7) called tie line.
How load frequency control is achieved?
When the load on the generator decreases, the speed of rotor increases, which leads to increase in frequency. To bring back the frequency to normal level, the governor reduces the turbine input. Thus, load frequency control is achieved by properly matching the individual machine’s turbine input by governor.
What is load frequency mechanism?
The load-frequency control is an important mechanism enabling TSOs to maintain stable power system frequency in the synchronous area.
What is control frequency?
1. Frequency control is a process of maintaining the stability of a power system. In the power system, the frequency of the loop gets deviate from the steady-state value under the action of load perturbation.
Why do we need frequency control?
In order to keep the expected operating conditions and supply energy to all the users (loads) connected, it is important to control these two parameters within predefined limits, to avoid unexpected disturbances that can create problems to the connected loads or even cause the system to fail.
How does frequency control work?
Primary frequency control is provided by generators that measure and respond to the frequency changes at their local connection points. These generators have some room to ramp up or down as required and will act in response to these large disturbance events to try and correct the frequency.
What is load frequency problem?
It is shown that the load frequency control problem is a typical disturbance rejection problem with rate limit, parameter variations, structural uncertainties and communication delays. Advanced control techniques are expected to be applied to improve the control performance.
How is frequency controlled?
Frequency variations in a power system occur because of an imbalance between generation and load. When the frequency value of a power system reaches the emergency condition, the control strategy is initiated. The frequency control is divided in three levels: primary, secondary and tertiary controls.
Is the main component in load frequency control?
The main parts are: 1) Speed changer 2) Speed governor 3) Hydraulic amplifier 4) Control valve.