Types of System Based on Stability
There are 3 types of system based on stability:
- Completely stable system
- Marginally stable system
- Conditionally stable system
- Unstable System
Completely Stable System
As the name suggests, a completely stable system provides a stable output for all ranges of values. One way to identify a completely stable system is to check the poles of the transfer function. If the poles of the open and closed loop system lie in the left half of the s-plane, then the system is completely stable.
The graph given below shows the completely stable system.
Completely Stable System
Marginally Stable System
A marginally stable system is a system that is stable for the current or present value. Any disturbance in the input can make the output of the system unstable. The marginally stable system can be identified when the poles of the open loop and closed loop system lie on the imaginary axis of the s-plane. The graph given below is the example of marginally stable system.
Marginally Stable System
Conditionally Stable System
When a system is stable for certain values, then it is known as a conditionally stable system. The system can become unstable during the transient response. In simple terms, a conditionally stable system is stable only when the loop gain of a system is in a particular range. The image given below shows a conditionally stable system.
Conditionally Stable System
Unstable System
A system is said to be unstable when it produces uncontrolled output. The unstable system can be identified when the open and closed loop poles are on the right half of the s-plane. The given graph shows the unstable system.
Unstable System
Control Systems – Stability
Control systems are used to control the behavior of any dynamic system. It provides accurate information about the dynamic system so that it can work well. One of the important aspects of the control system is STABILITY. The stability of the system is important in order to get the desired output from the system. In this article, we will deal with how control system analysis helps in providing stability to the system. We will also study types of stability, applications, and many more.
Table of Content
- What is Stability?
- Types of Stability
- Types of System Based on Stability
- Methods to Analyze the Stability
- Applications
- Advantages and Disadvantages
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