This is a control theory question, but because there is no control theory stack exchange, I thought this was the closest appropriate location:
I've been studying feedforward control system designs, specifically motion stages that use acceleration feedforward control. In this control system, a control signal is generated based on changes in the command signal (as opposed to relying solely on feedback control).
My question, what does feedforward typically do to the system response bandwidth? If done correctly, I would assume it increases the bandwidth? Say for example the feedforward controller is designed as the inverse of the plant, is there a proof that illustrates that bandwidth is increased?
Furthermore, most feedforward control setups combine feedforward control with feedback control. In this scenario, how does the bandwidth between a feedback system and feedback-feedfoward system compare? Assume feedforward control is used in the sense of creating a command signal that attempts to compensate for changes in the reference command.