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Various control strategies for power regulation in variable-speed wind turbines commonly assume that the whole system parameters are known and available, which is not necessarily satisfied in practice. In this work, an adaptive control strategy, which neither need to know completely the system parameters nor the rotor acceleration, is proposed for power regulation and tracking. It also includes a...
To the optical mechanical complexes of tracking and positioning, strict requirements are produced on the dynamics and permissible errors under such conditions as external and internal nonstationary disturbances, as well as presence of elastic deformations in the links of the driven mechanism. In modern systems, adaptive control algorithms have proven themselves as complementary to the main control...
Flux-Weakening (F-W) based on feedback voltage regulation is commonly adopted in Interior Permanent Magnet Synchronous Motor (IPMSM) drive systems. Voltage vector magnitude is controlled in closed-loop by modifying the current reference space vector, following a reference value related to the inverter limitations. Stable and fast voltage control allows to operate with lower voltage margin, which leads...
Maximum Torque Per Ampere (MTPA) tracking techniques for the control of Interior Permanent Magnet Synchronous Machines (IPMSMs) and Synchronous Reluctance Machine (SynRMs) drives were introduced in the last decade, with the aim of overcoming the dependence on motor parameter knowledge accuracy. In fact, uncertainty due to identification errors, magnetic saturation or temperature variation results...
This article analyzed the limitation of stepping motor in current application. The model of hybrid two-phase stepping motor is established. A control system based on fuzzy adaptive control method is designed, and the effectiveness of this method is proved by practical test. The results show that the overshoot of the fuzzy adaptive control is about 5.2% and the adjustment time is about 100 ms.
In this paper, a robust and an efficient tracking controller based on model reference adaptive system (MRAS) technique is performed for mobile robot in order to get the accurate trajectory tracking performance. The model reference adaptive system (MRAS) technique has been presented so as to achieve the estimated value of system's speed information. To estimate the rotor position and speed of the mobile...
Due to the adverse temperature swings which normally occur in the power semiconductor devices during the start-up and deceleration periods of the motor drive system, the thermal design and control, as well as the reliability analysis of the power devices becomes crucial. In order to facilitate testing and access the loading and lifetime performances, a novel stress emulator for power semiconductor...
The experimental method of a robust adaptive trajectory tracking control of nonholonomic wheeled mobile robots using only web camera is proposed. This paper proposes an experimental system for using video camera images in MATLAB / Simulink(R)using donated software. We make a simple contrivance, the coordinates information which can be given by video camera image can take into MATLAB/Simulink, and...
In the paper, an adaptive structure for two-sided electrical drive is presented. The control object has a multiple-input multiple output structure, since two input signals (motor torques) are available for the controller. The assumed model of the plant is non-linear (presence of backlash) and reveals resonant nature (elasticity in the mechanical structure). The controller is a two-layer recursive...
The paper concerns the development of a adaptive sliding mode control based on super twisting (ASTW) and can be applied to a Human-Driven Knee Joint Orthosis. Therefore, a model of the shank-orthosis system is given considering the human effort as an external torque acting on the system. The main objective of this paper is to bring together two approaches to reduce the phenomenon of chattering, adaptation...
Electric Power Assisted Bicycle (EPAC) is becoming the transport and fitness tools that people pursue because of its green, healthy and economical characteristics. Compared to the conventional electric bike, EPAC not only reduces the burden on the rider, but also maintains the original bicycle characteristics. Nowadays, there is few study of the control approach adaptive to road slope and load for...
This paper deals with the control of an active ankle foot orthosis (AAFO) to assist the gait of paretic patients. The AAFO system is driven by both, the residual human torque delivered by the muscles spanning the ankle joint and the AAFO's actuator's torque. A projection-based model reference adaptive control is proposed to assist dorsiflexion and plantar-flexion of the ankle joint during daily living...
In this paper, the use of an adaptive control method for an induction motor is described. Using the conventional adaptive control method, it is possible to stably estimate the inverse time constants (both primary and secondary) during the powering mode. However, it becomes unstable during the regenerating mode. To solve this problem, there is a method that changes the adaptive control gain in the...
Inertial Stabilised Platform, better known as gimbal are becoming increasingly popular, with a large range of products now available in mainstream shops. Most of these items are nonetheless controlled using very basic algorithms that do not offer best achievable performances. First, each axis is controlled independently of one another. Then, they make use of trigonometry for their calculation. Lastly,...
Shift quality and shift time of the automatic transmission is required to be consistent in mass production and with mileage accumulation. In order to compensate for the influence of build-to-build variations and life-cycle variations on shifting process, there should be an adaptive control in the software in addition to the base control of the shifting process. The adaptive control can adjust control...
In this paper, an adaptive controller is proposed for controlling flexible joint robots containing time-varying uncertainties. The controller is free from the computation of the regressor matrix which largely simplifies its implementation. The feedback of link accelerations and their higher derivations are avoided without the support of Slotine and Li's modification. The number of update laws in the...
This paper describes application of calculated torque method and majorizing functions method to the synthesis of adaptive control systems with rigid multi degree of freedom interconnected nonlinear mechanical plants.
This paper presents a design and comparative study of backstepping and adaptive nonlinear control for variable wind speed energy conversion system based on a permanent magnets synchronous generator. The adaptive Backstepping control is applied in order to extract the maximum energy from wind by the high tracking performance of speed control. The main contribution of this control is the robustness...
For a safe and efficient operation of large variable-pitch wind turbines, the controller plays a vital role. Below the rated wind speed, there is a power-optimal rotor speed for a given wind speed, achieved by designing a generator torque control. Pitch control is appropriate above the rated wind speed, to keep the rotor speed constant. In order to deal with nonlinearities and uncertainties, in this...
This article deals with the development of a simple adaptive controller for DC motor drives, based on the feed forward compensation of the drive's dynamic. Several variants of the drive's inverse model are proposed in both continuous and discrete form. The model's parameters are estimated online using the Recursive Least Squares method. A polynomial approximation filter (Savitzky-Golay) to determine...
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