Topic
Proportional control
About: Proportional control is a research topic. Over the lifetime, 3756 publications have been published within this topic receiving 49050 citations.
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10 Mar 2003
TL;DR: In this article, a position controller of a motor is equipped with a plurality of control parameter sets in advance which contain at least a proportional gain of a positional control part and that of a speed control part.
Abstract: PROBLEM TO BE SOLVED: To provide a position controller of a motor capable of adjusting a control parameter in a short period of time with high responsiveness, without measuring in advance the frequency characteristics of an object to be controlled that has a resonance frequency. SOLUTION: The positional controller of a motor is equipped with a plurality of control parameter sets in advance which contain at least a proportional gain of a positional control part and that of a speed control part. Selecting a set and measuring a response state of a motor to the positional instruction when the motor is controlled using the control parameter of a selected set are sequentially performed. A desired single set is selected according to a measured response state. A set of selected control parameters is established and the control parameters are changed as a set. COPYRIGHT: (C)2004,JPO
11 citations
TL;DR: In this article, an automatic electro-hydraulic depth control system was developed to maintain the injection depth within narrow margins around the desired value, where the hydraulic system of the four-point linkage of the slurry tanker was used to change the position of the injector with respect to the tanker in order to minimize the difference between the desired height of the supporting frame of an injector and the height measured by means of an ultrasonic sensor.
11 citations
01 Oct 2018
TL;DR: This paper proposed a single-phase qZSI with lead compensator in the control system driven by unipolar carrier based pulse width modulation (CB-PWM) technique that demonstrates its superiority for theqZSI to achieve good dynamic, steady-state, and transient performances under both the continuous conduction mode (CCM) and discontinuous conduction modes (DCM) operations.
Abstract: The emergence of quasi Z source inverter (qZSI) in 2008 has grabbed researchers’ attention to explore new enhancement control schemes and modulation techniques in the past decade. This paper proposed a single-phase qZSI with lead compensator in the control system driven by unipolar carrier based pulse width modulation (CB-PWM) technique. Specifically, the lead compensator acts as qZSI’s outer voltage loop controller while the current inner control loop is attained via the conventional proportional (P) controller. When compared with traditional dual loop based proportional integral (PI)-P controller, the proposed controller demonstrates its superiority for the qZSI to achieve good dynamic, steady-state, and transient performances under both the continuous conduction mode (CCM) and discontinuous conduction mode (DCM) operations. All design procedures are presented thoroughly in this paper and the effectiveness and theoretical analysis of the proposed approach are verified through simulation using MATLAB/Simulink software.
11 citations
19 Apr 2011
TL;DR: The results of simulations show that the proposed method has the capability to damn optimally and suppresses error to minimum and is compared to another method.
Abstract: The damping of oscillation in power system commonly use known controller such as power system stabilizer (PSS). Proportional integral derivative (PID) controller tuning based on power system stabilizer and AVR is presented in this paper. The parameters of PID controller such as proportional gain, integral factor, differential coefficient and gain AVR are selected and optimized by BF-PSOTVAC. The proposed method is applied to PID controller tuning and is compared to another method. The integral time absolut error standards of optimization design as objective function. The results of simulations show that the proposed method has the capability to damn optimally and suppresses error to minimum
11 citations
TL;DR: In this paper, the performance of the variable displacement wobble plate compressor was analyzed and the forces acting on the control valve were analyzed and a mathematical model to analyze its performance was developed.
Abstract: The performance of control valve is analyzed in this paper in order to study characteristics of the variable displacement wobble plate compressor. The forces acting on the control valve are analyzed and the mathematical model to analyze its performance is developed. A test bench is set up to get the steady and dynamic performance of control valve. The steady-state performances predicted by the mathematical model agree well with the experimental data while the predicted dynamic performances agree with the experimental results qualitatively. With the mathematical model, the steady-state performances of the control valve with four different preset control points and three different effective areas of the evacuated bellows have been analyzed, and the dynamic behavior of one type control valve has been studied. It is shown that: (1) the suction pressure at preset control point is inversely proportional to the discharge pressure; (2) the larger the starting force of spring in control valve or the smaller the effective area of evacuated bellows, the larger the suction pressure at preset control point; and the larger the starting force of spring in control valve and the smaller the maximum opening of ball valve, the more quickly the crankcase pressure changes and the smaller mass flow rate of control valve; the slope ratio of crankcase pressure to suction pressure cannot be influenced by the starting force of spring in control valve but can be influenced by the effective area of evacuated bellows; (3) the transition time of the crankcase pressure is about 1 s and can be neglected when working condition changes.
11 citations