Method and device for modeling closed-loop control systems

Abstract

An embodiment of the invention provides a method and a device for modeling closed-loop control systems. The method includes establishing state space representation forms of the closed-loop control systems; determining uncertain gain matrixes of the state space representation forms according to mapping relations between the uncertain gain matrixes and preset thresholds; determining feedback gain matrixes of the state space representation forms according to stability conditions of dissipation systems; building system models of the closed-loop control systems according to the uncertain gain matrixes, the feedback gain matrixes and the state space representation forms. Each state space representation form comprises a disturbance term, and the disturbance terms are used for representing joint influence of modeling errors and unknown disturbance on the systems. The method and the device for modeling the closed-loop control systems have the advantages that the dissipation characters of the closed-loop control systems are considered, and accordingly the robustness of the closed-loop control systems can be improved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of control, and in particular to a modeling method and device for a closed-loop control system. Background technique [0002] Pitch power regulation method is one of the common methods of wind turbine power regulation. When the wind changes, the wind generator uses the blade pitch adjustment controller to change the blade pitch angle, maintain a constant speed, and adjust the output power of the wind generator to achieve the desired goal. The more commonly used control method is PID control. PID control is a modeless control method whose robustness cannot be determined and verified. [0003] Aiming at the defects of the PID control method, an existing solution is: use the fuzzy T-S model to approximate the continuous time nonlinear model of the wind turbine pitch control system, and according to the obtained fuzzy T-S model, use single-point fuzzification, The dynamic fuzzy model...

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Problems solved by technology

However, this method is partial to theory, especially one of the parameters is the observable unknown matrix of Lomborg, which cannot be engineered, and cannot be used in practical engineering applications, and ignores modeling errors and disturbances, and is robust to the control system have a greater impact

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