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For overcoming the disadvantages of wide range wind power perturbation and model parameter uncertainties, a novel maximum power point tracking (MPPT) controller for permanent magnet synchronous generator (PMSG) based vertical axis wind power generation system is developed using back-stepping control method. The MPPT controller adopts wind turbine's optimum rotational speed tracking algorithm, and...
A partial integrated guidance and control (PIGC) scheme for an air-breathing generic hypersonic vehicle (GHV) in the initial reentry phase is proposed in this paper. The six-degree-of-freedom (6DOF) dynamical and kinematical models of the hypersonic vehicle are constructed. For implementing the 6DOF guidance and control scheme, a two-loop control structure is conducted. Two sliding surfaces are constructed...
The servo systems are always difficult to design with high-accuracy due to nonlinear stick-slip at the low velocities and the uncertainties of friction dynamic model. A linear active disturbance rejection control (ADRC) dynamic compensation solution is presented independent of the friction model. To deal with the problem of observing or tracking for unknown discontinuous signals of friction with Stribeck...
In this paper, the active disturbance rejection control (ADRC) approach is applied to output-feedback stabilization for a class of uncertain multi-input multi-output (MIMO) nonlinear systems with stochastic inverse dynamics and stochastic disturbance. We first design an extended state observer (ESO) to estimate both unmeasured states and stochastic total disturbance which includes unknown system dynamics,...
The flatness-based active disturbance rejection control (ADRC) approach via online algebraic parameter identification is proposed to deal with the double tank problem. The control task is to maintain the lower tank level at a desired value by manipulating the inlet regulating valve. Firstly, the double tank problem is formulated based on the designed double tank platform, where the process input and...
In this paper, we construct a nonlinear extended state observer (ESO) through nonlinear functions switching between sub-linear and linear regions. The convergence is proved with explicit error estimation. The numerical simulations are carried out for comparing the performance of different ESOs. The simulation visualization shows that the proposed ESO in this paper takes advantages of low peaking value...
Backlash is one of the most important nonlinearities that limit the performance of speed and/or position control in mechanical systems, which could cause a severe deterioration in system performance, even a limit cycle oscillation. In this paper, backlash is modeled by a differential equation to capture its main characteristics together with approximation errors. Parametric uncertainties existing...
This paper proposes the Extended State Observer (ESO) based control strategy for quarter-car active suspension systems with performance constraints. The proposed control scheme requires an ESO to estimate and compensate road disturbances, so that ride comfort of the vehicle is improved significantly. Besides achieving good control performance, the system constraints on both the suspension movement...
Active disturbance rejection control (ADRC) shows much promise in obtaining consistent response in an industrial control system full of uncertainties. In traditional applications of ADRC, the system's order is known. This paper concerns with the capability of ADRC for nonlinear time-variant systems with unknown orders. The controlled system's local model whose order is set according to the controller...
In this paper, a high performance force control is proposed for a hydraulic load simulator, in which a nonlinear robust controller and an extended state observer are synthesized. The linear control based on hydraulic linearization equations is difficulty to satisfy the increasingly high performance requirements because of the hydraulic inherent nonlinear properties and uncertainties. The extended...
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