Nyquist Stability Criterion

The Nyquist Stability Criterion is a method used in engineering to assess whether a control system will remain stable when we connect a controller to a plant (the system we want to control). It involves plotting the system's frequency response on a graph called the Nyquist plot. By analyzing how this plot winds around a specific point (usually -1 in the complex plane), engineers can determine if the system will behave predictably or become unstable (like oscillating wildly). Essentially, it’s a way to predict stability by examining the system’s behavior across all frequencies.