【Daily Question】Theoretical Foundation 2019.12.28

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Fill-in-the-blank question: To increase the bandwidth of a control system and raise its gain while reducing steady-state error, which method should be used? ( ) A. Phase-leading series correction B. Phase-lagging series correction C. Local velocity feedback correction D. Feedforward correction Answer: A； Analysis: When system stability is satisfied, it is required that the system have a fast response and low overshoot; in such cases, series lead compensation can be employed. Lead correction takes advantage of the characteristic that a lead network correction device has a phase shift ahead and an increased amplitude; after correction, the cutoff frequency of the system can be widened and the phase margin y can be increased, thereby effectively improving the speed and stability of the system’s dynamic performance. Hint: Additional rewards will be given to those who can explain the problem-solving process; the answers can be found here!