What is disturbance? List its types?

A disturbance signal is generally observed in the control system. It is the unnecessary inputs that affect the control system's output. Due to this, an error occurs in the system. Control-system engineers set up the system with proper design to maximally eliminate the effects of disturbances on the output and system error.

Types of disturbances in the control system are:

• Change in setpoint - The setpoint is the desired value of the measured variable.
• Change in supply - This is a change in any of the energy inputs to the process.
• Change in Demand- This defines a change in the output flow of energy.
• Environmental Changes- Change in temperature or atmospheric pressure.

Types of disturbance that enter control loops from the outside:

• setpoint changes
• load variations
• noise