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The paper deals with a Second Order Variable Structure Control (VSC) for Wind Turbine PMSG-based and Generator-side Converter System. By means of the proposed control and the associated sliding observer, a vectorial control of PMSG generator is recognized while maximum power point tracking by the renewable source and DC voltage control of the generator-side converter are assured to maintain a high...
In this paper we present a new approach to closed-loop control design which provides generation of regular or chaotic oscillations in a dynamic systems. Proposed approach is based on idea of introduction of desired attractor (boundary circle or strange attractor) in closed-loop system state space. The practical usage of this approach for the problem of nonlinear oscillations generation in DC electromechanical...
In this paper we present modifications in the sphere decoder initially introduced in [1] and modified in [2] that allow for its implementation in transient operation. By investigating the geometry of the integer problem underlying direct model predictive control (MPC), a new sphere that guarantees feasibility and includes a significant smaller number of candidate solutions is computed. In a first...
Sliding Mode Control (SMC) has been successfully implemented in power converters applications since the discontinuous nature of the controller output allows direct switching of power electronic devices. However, due to physical limitations of power converter, the switching frequency must be maintained at low levels in order to prevent overheating and hazardous conditions of the semiconductors, therefore,...
Wind energy installed power worldwide reached 350.000 MW in 2015 with strong prospects to grow notably in the next 20 years. The cases of E.U. and of Denmark are illustrated. Electric generators and their power electronics control represent an important part of any wind energy conversion system, besides the turbine, tower and auxiliary electrical equipment. Large wind generator transmission stages...
This paper proposes to optimize wind energy extraction through a hybrid PID-Fuzzy pitch control strategy for wind turbines. The modeling of a 20 kW wind turbine will be reviewed, in which three strategies of pitch control, PID, Fuzzy and Hybrid PID-Fuzzy, will be implemented, comparing the results of the different control strategies.
Power electronic converters enable wind turbines, operating at variable speed, to generate electricity more efficiently. Among variable speed operating turbine generators, permanent magnetic synchronous generator (PMSG) has got more attentions due to low cost and maintenance requirements. In addition, the converter in a wind turbine with PMSG decouples the turbine from the power grid, which favors...
The output torque of switched reluctance motor (SRM) can be controlled by flowing an appropriate current through the armature windings. In general, current hysteresis control has been applied. However, there is a problem that acoustic noise generated from the SRM at the driving tends to become large. Then, there are reports that PWM control has been applied to suppress the acoustic noise. This paper...
This paper presents an anisotropy-based position estimation approach taking advantage of saturation effects in permanent magnet synchronous machines (PMSM). Due to magnetic anisotropies of the electrical machine, current responses to high-frequency voltage excitations contain rotor position information. Therefore, the rotor position can be estimated by means of these current responses. The relation...
The paper describes the voltage control technique of squire-cage induction machines supplied by a current source inverter. The control system is based on new transformation of the electric drive system (machine and inverter) state variables to the multi-scalar variables form. The backstepping approach is used to obtain the feedback control law. The control system contains the structure of the observer...
The greatest progress is observed in variable speed AC electric drives. The article presents principles and approaches to the synthesis of structures and parameters of corrective connections of AC electric drives with field regulated reluctance machine. It is shown that the quality of the control parameters depends on the conditions for setting the internal regulation loop of the electromagnetic torque...
Motor control system may be the most important part of electric vehicles. To implement the control strategies, a lot of practical problems need to be taken into account. In this paper, an induction motor control system for electric bus is developed based on digital signal processor (DSP). The control strategy is based on field-oriented control and space vector pulse width modulation. Over-modulation,...
This paper introduces a new design method of discrete-time fractional-order PIλ controllers. It is based on using an exact discretization method that always guarantees the implementation of 3rd-order, minimum-phase, and stable discrete-time controllers. The structure of the controller can be considered as an adaptive one since it only depends on the order of the controller, which is one of three tuning...
A technique called active disturbance rejection control is proposed to realize the acceleration/deceleration process of aero-engine in a more flexible manner. According to the requirements of response time for acceleration/deceleration state, tracking differentiator is utilized to arrange the expected transition trajectories. An extended nonlinear state observer is introduced to estimate the rotor...
Aiming at the quadrotor characteristics of non-linearity, strong coupling and vulnerability to external disturbances, the attitude controller and height controller are designed based on linear active disturbance rejection control (LADRC). During the design of attitude controller, a virtual control variable is introduced at first to realize the decoupling of static part in system coupling terms. The...
This paper suggests data-driven Model-Free Control (MFC) algorithms based on the combination of Takagi-Sugeno fuzzy (TSF) and intelligent proportional-integral (iPI) controllers. The new MFC algorithms are referred to as mixed TSF-iPI controllers, which are designed to control Single Input-Single Output (SISO) control structures for azimuth and pitch position control of a nonlinear twin rotor aerodynamic...
This paper describes an experimental applied study on advanced quadcopter control. A special setup is used to conduct a series of experiments of roll and pitch motion control. Three robust output controllers are verified. One of the controllers is the consecutive compensator, the remaining two are its modifications aimed to increase precision and reduce overshoot. Experiment specifications and comparative...
Wind energy has recently become the most cost-effective and environmentally friendly amongst other renewable energy resources. However, since wind resource is intermittent in nature, the wind power output is inconsistent. Therefore, a control system needs to be implemented to ensure that maximum power is extracted from the wind resource at a wide range of wind speeds to optimize the performance of...
The control systems of modern electric drives are built with using the principle of subordinate control, therefore the quality and accuracy of control of all external loops largely depends on internal control loops. In the article a typical, which is widely used in practice, and robust current control systems, which is obtained based on of a general solution of the polynomial synthesis equation, are...
The article considers construction of the device for implementation of the smooth start-up, the brake and positioning of asynchronous engines allowing to minimize the quantity of force semiconductor keys and to meet requirements to energy saving. The ways to reduce mass-dimensional indices of the booster transformer, which is a constructive basis of the offered device, by the drive elimination of...
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