SENSITIVITY ANALYSIS OF SYSTEMS WITH A SMITH PREDICTOR BASED CASCADE COMPENSATOR TO TIME-DELAY VARIATION
N. A. Vunder1, A. V. Ushakov1
St. Petersburg National Research University of Information Technologies, Mechanics, and Optics, pr. Kronverkskii 49, St. Petersburg 197101
Keywords: непрерывный объект управления, звено чистого запаздывания, последовательный компенсатор, схема Смита, чувствительность процессов к вариации запаздывания, continuous control plant, dead-time element, cascade control, Smith predictor, sensitivity of processes to time-delay variation
Abstract
This paper considers the inclusion of a cascade compensator in the forward path of designed systems according to the Smith predictor scheme, which is an effective way to solve two problems: achieving the desired performance of the system processes and placing the dead-time element outside the closed loop, so that its effect is only manifested in an increase in the transient time by the delay value and does not affect the overshoot value. It is shown that the Smith predictor scheme should be used with caution because, being an additive signal compensation scheme, it may be not robust and require accurate knowledge of delay values for its robust implementation. The problem of sensitivity analysis of the processes in the system to time-delay variation is stated and solved.
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