Abstract
In industrial closed-loop control systems such as thyristor current converters, good system quality can be difficult to obtain, for example, because of the lack of complete compensation of interference by the feedback arrangement. This paper describes an application to such equipment of Feedback/Forward Control (FBFC), which can implement optimum regulation provided that the regulated output and the open-loop transfer function are both stable.
The basic premise of the control scheme considered here is that, since there is zero steady-state error between reference and feedback signals, it is possible to replace the feedback circuit by a digital controller having a number of inputs; when the reference or feedback signal varies, the output of the controller will then follow the change, and the system output can reach a new steady-state with a minimum time lag (optimum regulation). FBFC achieves accurate system regulation by combining the usual advantages of feedback control with the anticipatory properties of feedforward control.
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