Complex PID Control Loops

Abstract

AbstractMany practical problems are more complicated than a simple PID controller can handle. Multivariable, constrained, or nonlinear problems require complex PID control solutions comprising multiple PID controllers and other function blocks working together in concert (Sect. 4.2). Although PID-based control schemes are surprisingly versatile in addressing many complex control problems (Sect. 4.1), the design and implementation can be surprisingly tricky. As there are many ways to achieve the same control objective with these building blocks, a good understanding of the operating requirements and adequate knowledge of these function blocks are crucial in choosing the best complex PID control design. Ensuring the loop integrity is one critical requirement that relies on in-depth knowledge of the data flow and the control design (Sect. 4.3). For a complex control solution, simplicity and reliability is always the top priority in the control design and the best solution is thus always the one that is fit-for-purpose.