The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In order to reduce the speed overshoot of the traditional PI speed controller in direct drive permanent magnet synchronous motor(DD-PMSM), a novel speed controller is presented in this paper. In addition, a reduced-order load torque observer is proposed to reduce the effect of load torque changes and other disturbance factors on the system performances. The observed torque is imported to the input...
This paper aims to add a controller to the exiting milling machining transfer function according to some design requirements, while establishing a control system based on Simulink simulation, the system corrected through Mat lab simulation. This experiment uses advanced correction methods to improve the system performance, observe its step and ramp response to determine the parameters needs be used...
In both the traditional diode uncontrollable rectifier circuit and thyristor phased rectifier circuit, the shortcomings of low power factor are difficult to overcome. PWM rectifier circuit is to use full control power switch devices and adopts PWM control mode of rectifier circuit, through the adoption of appropriate control strategies and PWM modulation technology, PWM rectifier circuit can realize...
An active disturbance rejection controller (ADRC) is designed and originally implemented on a real torsional plant. The torsional plant resembles the dynamics of a rotational system. Due to mass imbalance, centrifugal imbalance, and the non-coincidence between the principal and geometric axes of a rotating disc, the system parameters of this torsional plant are varying constantly. In addition, an...
In order to ensure the effective operation of condensing steam turbine, a vacuum control method with double compensation loops is developed to solve the problem of condenser vacuum. Firstly, the system identification is carried out according to the measured data of the condenser, and the mathematical model for the condenser vacuum pressure, the flow rate of circulating water and the regulating valve...
A novel Programmable Analog Array of fractional-order filters is proposed in this paper. It is constructed from an active core which is implemented using Current Feedback Operational Amplifiers as active elements. The scheme offers the realization of lowpass, highpass, bandpass, and bandstop fractional-order filter functions of various orders, and this is achieved through the utilization of resistor...
This paper deals with the robust control problem for linear systems with both gain and time constants variations under fractional order PIλDμ controller. A robustness specification to the parameters variations is proposed. For those systems with more than one uncertain time constant, the robustness specifications are analyzed and simplified. To minimize the phase offset nearby the crossover frequency,...
In this paper we propose a new universal searchless method for tuning the parameters of linear controllers. We compare tuning parameters of the PIDD2 (proportional, integrative, derivative and double derivative) controller, which have been found by the proposed method, with the ones of the predictive PID controller. The results demonstrate the advantages of the proposed method. We also provide some...
This paper investigates the fragility (both from the stability and performance point of view) of (optimally tuned) fractional-order P(I)D controllers applied to integral processes. Indeed, the effects of the variations of the controller parameters are investigated in order to understand if the fine tuning of the controller is a critical issue. Both the set-point response and the load disturbance rejection...
A detailed analysis of a PI tank level control is performed with respect to both load disturbance attenuation and set-point change. Certain performance indices are given providing guidelines for achievable accuracy and controller settings. Exact formulas for extrema of time responses are derived, which use a novel parametrization of system poles. For transfer between equilibria under control signal...
This paper deals with Fractional Complex Order Controller FCOC tuning. The paper presents new structure of FCOC with the form PIx+iyD, in which x and y are the real and imaginary parts of the integral complex order, respectively. With the controller's five parameters, we can fulfil five design requirements. Design specifications are set to ensure robustness toward gain variations, noise on system...
The goal of this paper is to present a software tool intended to aid at the design of 2DoF PI/PID controllers by using the Model REference Robust Tuning (MoReRT) approach. This tool is suitable for those who need to design the PID controller for the simple closed-loop feedback in an effective and user-friendly way. The tool has been implemented in MATLAB<®/SIMULINK<®. and has been designed on...
The possibilities of automatic control systems with PI2D-controller are discussed in this paper. It was proposed the procedure for the calculation of its parameters based on a modal approach. Comparative analysis of the system with PI2D-controller using numerical simulation in Matlab was carried out. The effect of the non-stationary object parameters and external disturbances was examined.
Control of the object with one output using many inputs is widely used for combining the advantages of every input and eliminating of disadvantages of two or more control channels. Such systems are called MISO, which means Many Inputs — Single Output. For the calculation of such systems we have proposed a theory based on the logarithmic frequency response. This method has proved to be excellent in...
In this paper, we propose a perfect model-following (PMF) system using active disturbance rejection control (ADRC). Simulation results show that the plant output follows the desired reference model output. By using the ADRC, we can ignore the parameter errors of the plant. Also the proposed method is designed a model following system, even if the order of the plant is different from that of the model.
In this paper dynamic properties of resonant converter with ZCS (Zero Current Switching) were proposed. Closed-loop control system and “control action — output voltage” transfer function was obtained.
Operation analysis and synthesis of the coordinated rotation system based on the two-speed induction motors (IM) with cage rotors presented. The circuit uses a transistor voltage controller to maintain the speed of IM. The second group of IM windings is used for parametrical synchronization, while transistor controller is used to compensate for the residual error. Transfer functions of the original...
This work addresses the boundary tracking control of a class of MIMO PDE-ODE cascade systems via learning control approach. Due to the temporal-, spatial- and iteration-varying properties, one of the key steps before the controller design is to reduce the variation of the systems. Therefore, frequency domain analysis techniques are adopted in this work, which can be used to remove the time domain...
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...
In this work we present algorithmic design steps of discrete variable gain controllers. The method is derived from the classical discrete deadbeat response approach. It is based on calculating the gain for each discrete sample that achieves the regulation in finite steps number equal the system order. The computation algorithm is implemented numerically by solving a system of nonlinear coupled equations...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.