Damping wisdom PI (Proportional-Integral) control method of large-scale time delay system

Abstract

The root cause of difficulty in controlling a large-scale time delay process is untimely information feedback, thereby causing incapability of a feedback information-based controller for the type of systems. For the control problem of a large-scale time delay system, the invention provides a controlled object model-dependent damping wisdom PI (Proportional-Integral) control method. By the method,a damping factor is introduced into proportional gain, and the gain of a DWPI (Damping Wisdom Proportional-Integral) controller can be adjusted according to a time delay estimated value and a system time constant estimated value. Theoretical analysis shows that a closed loop control system composed of the DWPI controller is globally asymptotically stable, and the DWPI controller is also high in anti-interference robustness and parameter perturbation robustness. A value simulation experiment verifies the correctness of the theoretical analysis, so the control method is an effective control method and has a wide application value in the field of time delay system control.

Description

technical field [0001] The invention relates to a control method of a large time-delay system, in particular to a damping intelligent PI control method. Background technique [0002] Time lag widely exists in industrial processes such as petroleum, chemical industry, power grid, nuclear reactor, and wastewater treatment. These industrial processes can often be simplified as one or more first-order plus-purity lag systems. Because of the existence of the time lag phenomenon, the control quantity of the system cannot respond to the dynamic changes of the system in a timely manner, which leads to the undesirable phenomena of large overshoot and long response time in the entire system, and even oscillation or instability. It brings great challenges to the design of time-delay system controllers. Therefore, solving the time-delay system control problem is of great significance to the precise tracking of the target trajectory and the stability of the system. For the control pro...

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Problems solved by technology

However, the error and the integral of the error are two completely different physical quantities (physical quantities of two different dimensions), and the inventor of this patent believes that there is obvious irrationality in the traditional PI control law model: (1) the error and the integral The independent weighted summation of two physical quantities with completely different attributes violates the basic arithmetic operation rules; (2) the mathematical model of the traditional PI control law cannot be accurately understood in the physical sense; (3) the mathematical model of the traditional PI control law is not It is different from forcibly separating and treating the two links with different attributes of error proportion and integral separately, which leads to the fact that the two links of error proportion and integral are independent of each other in the control process, and thus lack the science of coordinated control (4) Because of the irrationality of the traditional PI control law model, for more than 80 years, the problem of PI parameter tuning has been the main problem that has plagued scholars and engineers in the fields of control science and control engineering at home and abroad.

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