Disturbance Preview Controller and Its Application to a Small UAV

In this paper, the optimal preview tracking control problem for a class of linear discrete-time periodic systems is investigated and the method to design the optimal preview controller for such systems is given. Initially, by fully considering the characteristic that the coefficient matrices are periodic functions, the system can be converted into a time-invariant system through lifting method. Then, the original problem is also transformed into the scenario of time-invariant system. Later on, the augmented system is constructed and the preview controller of the original system is obtained with the help of existing preview control method. The controller comprises integrator, state feedback, and preview feedforward. Finally, the simulation example shows the effectiveness of the proposed preview controller in improving the tracking performance of the close-loop system.

Section: Introductionmentioning

confidence: 99%

Optimal Preview Control for Linear Discrete‐Time Periodic Systems

Liao

Sun

Usman

2019

“…In these control algorithms, preview control, which can be closely correlated to state space model, is one of the approaches available for producing a good performance by utilizing future information of the reference signal in the controller. Currently, preview control had been researched in servo-system control, robot control [12], spacecraft control [13], and generator set control [14]. Meanwhile, some future state signals and interference signals in the air conditioning system can be predicted, even without model.…”

Section: Introductionmentioning

confidence: 99%

Simplified Thermal Model and Optimal Control for Chilled Water Pipe in Air‐Conditioning System

Zhao

et al. 2019

As an important subsystem in air-conditioning system, water system connects the chiller and terminal equipment. Therefore, it is necessary to develop an accurate thermal model for chilled water pipe to create the suitable indoor temperature and humidity environment. In this paper, the thermal model of the pipe was considered by utilizing the simplified thermal time-delay state-space model with the mass, energy balance, and heat consumption equations. Based on this improved model, the preview control as control strategy for water pipe temperature was proposed, and its robustness and stability were discussed. Subsequently, the performances of this model and control strategy were tested in a fan-coil system simulating with MATLAB and TRNSYS (Transient System Simulation Program). Explicitly, the results show that this model accurately predicts the thermal characteristic, and the average mean squared errors for water temperature were 11.14% and 12.82%, respectively. Meanwhile, the tracking effect of valve controller was better than the control strategy with no preview control.

“…According to the existing conclusions in [11], the dynamic characteristics of the descriptor system, including the regularity, causality, stabilizability, and detectability, remain unchanged after the transformation. Therefore, these characteristics of system (1) can be obtained by studying system (8) or (9). The so-called "system (1) is causal" means that the matrix 22 in system (9) is nonsingular.…”

Section: Limited Equivalent Transformationmentioning

confidence: 99%

“…In [5], the unified algorithm of linear system and ∞ preview control problem is presented by using the Hamiltonian matrix method, which is suitable for both continuous and discrete-time systems. In recent years, more attention has been paid to the applications of preview control theory [8][9][10]. Based on the least mean square algorithm of -X filter, [8] proposed a method to realize the preview feed-forward control by using the future wind speed information, which can adjust the rotor speed and reduce the load of the wind turbine.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the least mean square algorithm of -X filter, [8] proposed a method to realize the preview feed-forward control by using the future wind speed information, which can adjust the rotor speed and reduce the load of the wind turbine. Reference [9] proposed an output-feedback ∞ preview controller and improved the antijamming performance and robustness of UAV flight control system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of an Optimal Preview Controller for a Class of Linear Discrete‐Time Descriptor Systems

Liao

Xue

2017

The preview control problem of a class of linear discrete-time descriptor systems is studied. Firstly, the descriptor system is decomposed into a normal system and an algebraic equation by the method of the constrained equivalent transformation. Secondly, by applying the first-order forward difference operator to the state equation, combined with the error equation, the error system is obtained. The tracking problem is transformed into the optimal preview control problem of the error system. Finally, the optimal controller of the error system is obtained by using the related results and the optimal preview controller of the original system is gained. In this paper, we propose a numerical simulation method for descriptor systems. The method does not depend on the restricted equivalent transformation.