Mixed H2/H infinity robust fuzzy tracking control algorithm

Abstract

The invention discloses a mixed H2 / H infinity robust fuzzy tracking control algorithm, which comprises the step of: embedding a given trajectory to be tracked and the inner module of a controlled object interfered by the external world into a control system so as to counteract a tracking path and an unstable pole contained in a transfer function of external interference, wherein a practical nonlinear system is more completely distributed through the H2 performance index of a system and the approximate error of an output equation of a T-S fuzzy model neutron system. The mixed H2 / H infinity robust fuzzy tracking control algorithm can greatly track a given trajectory on the basis of a T-S fuzzy model robust tracking control strategy and using a medium speed pulverizer in a power station as an object, can satisfy the H infinity performance index of an unknown interference suppression degree to properties, and the H2 optimization performance index in a control process, and can be used for preferably studying the robust performance of a network studying control system in power stations.

Description

technical field [0001] The invention relates to the field of power station systems, in particular to a T-S fuzzy model-based hybrid H2 / H∞ robust fuzzy tracking control algorithm suitable for large-scale power station comprehensive automation systems. technical background [0002] The power station system is a typical complex industrial system, which contains many system elements, huge structure, and many detection data and model variables. Production links with complex characteristics such as nonlinearity, these links cannot be accurately described mathematically using traditional transfer functions, nor can they be processed by applying state equations in modern control theory. In order to control the automation device that realizes the means, it has experienced the combined pneumatic unit control instrument system, the combined analog instrument control system based on the electric unit, the centralized computer control system, the decentralized control system (DCS), and t...

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Problems solved by technology

[0004] But at the same time, due to the large number of information sources in the large-scale network control system, the transmission of information needs to occupy the network communication lines in time, and the network's carrying capacity and communication bandwidth are limited, which will inevitably cause information collisions and retransmissions. Unavoidable delays in the transmission process

Due to the influence of many factors such as the communication protocol adopted by the network, the load status of the network at that time, the transmission rate of the network and the size of the information packet, etc., the delay is characterized by being fixed or random, bounded or unbounded, resulting in control The performance of the system is degraded or even unstable, and it also brings great difficulties to the analysis and design of the control system

Traditional control theory often makes many idealized assumptions when analyzing and designing systems, such as single sampling frequency, synchronous control, and no-delay sensing and regulation. In networked control systems, especially large-scale industrial networks, In the control system, due to the large number of network information sources and the network delay in the control loop, the above assumptions are usually not valid