Simulation research on constant pressure system of synchronous generator based on two-dimensional cloud model PID

2015 ◽  
pp. 583-588
Keyword(s):  
Constant Pressure ◽  
Cloud Model ◽  
Synchronous Generator ◽  
Two Dimensional ◽  
Pressure System ◽  
Simulation Research

The initial motion of a gas bubble formed in an inviscid liquid Part 1. The two-dimensional bubble

1962 ◽  
Vol 12 (3) ◽  
pp. 408-416 ◽  
Author(s):  
J. K. Walters ◽  
J. F. Davidson
Keyword(s):  
Constant Pressure ◽  
Bubble Radius ◽  
Steady Motion ◽  
Two Dimensional ◽  
Spherical Cap ◽  
Liquid Part ◽  
Irrotational Motion ◽  
Acceleration Of Gravity ◽  
Small Bubbles ◽  
Initial Motion

The paper deals with the initial motion of a two-dimensional bubble starting from rest in the form of a cylinder with its axis horizontal. The theory is based on the assumptions of irrotational motion in the liquid round the bubble, constant pressure within the bubble, and small displacements from the cylindrical form. This theory predicts that the bubble should rise with the acceleration of gravity, over a distance of at least the initial bubble radius, and that a tongue of liquid should be projected up from the base of the bubble into its interior. These predictions are confirmed by experiments which also show how the vorticity necessary for steady motion in the spherical-cap form is generated by the detachment of two small bubbles from the back of the main bubble.

scholarly journals An MPPT Control of a PMSG-Based WECS with Disturbance Compensation and Wind Speed Estimation

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6344
Author(s):  
Janusz Baran ◽  
Andrzej Jąderko
Keyword(s):  
Wind Speed ◽  
Reactive Power ◽  
Nonlinear Function ◽  
Variable Structure ◽  
Synchronous Generator ◽  
Angular Speed ◽  
Voltage Source ◽  
Simulation Research ◽  
Point Tracking ◽  
Power Point

The paper presents simulation research on a variable structure control scheme of a small variable-speed fixed-pitch wind energy conversion system (WECS) with a three-phase permanent magnet synchronous generator (PMSG) in variable wind conditions. The WECS is connected to a power grid through two back-to-back voltage source converters (VSCs) with a DC link. The presented control algorithm is based on feedforward compensation of the wind turbine aerodynamic torque estimated using a linear disturbance observer (DOB). The torque estimate is employed to determine the effective wind speed, required for setting the reference angular speed, using numerical zero search of a nonlinear function. The simulation model, built in the Matlab/Simulink environment using the Simscape Electrical toolbox, includes the field-oriented control of the PMSG via the machine VSC, performed by cascaded angular velocity and current/torque PI controllers, as well as synchronization with the grid and the reactive power control via the grid VSC. The presented results are focused on the performance of the proposed control in the maximum power point tracking (MPPT) operating region of the WECS for various wind speed profiles.

Simulation Research of Wind Power Rotate Speed Based on Cloud Model of Fuzzy Reasoning PID Control

2013 ◽  
Vol 816-817 ◽  
pp. 857-861
Author(s):  
You Jun Yue ◽  
Yue Xu ◽  
Hui Zhao ◽  
Hong Jun Wang
Keyword(s):  
Wind Speed ◽  
Fuzzy Control ◽  
Wind Power ◽  
Pid Control ◽  
Fuzzy Controller ◽  
Cloud Model ◽  
Fuzzy Reasoning ◽  
Fuzzy Pid Control ◽  
Simulation Research ◽  
Speed Change

When wind turbine works under rated wind speed, we often use fuzzy controller to control rotate speed and keep the best sharp blade speed to achieve the aim of capture the largest wind power. Due to the nonlinearity of wind power, the uncertainty of timely change and other factors, though fuzzy PID control is the combination of fuzzy control and PID control, which can solve the problem of nonlinear very well, it focuses only on the fuzziness, and fails to consider the random error brought by wind speed change. Therefore this paper designed fuzzy reasoning PID controller based on cloud model on the base of analyzing parameters of wind power and advantage as well as shortage of both PID control and fuzzy control. Then start the RT-LAB simulation platform. The simulation result proved that this method can effectively depress the overshoot. And its stability and dynamic speed response is better than PID control and fuzzy control. It achieved ideal result.

Development of New Power Line Driven by Constant Pressure System

2002 ◽  
Author(s):  
Hiroyuki Sugawara ◽  
Ken Ichiryu ◽  
Yutaka Kondoh ◽  
Takamichi Abe
Keyword(s):  
Constant Pressure ◽  
Power Line ◽  
Pressure System

Optimal Javelin Release

1995 ◽  
Vol 11 (4) ◽  
pp. 371-394 ◽  
Author(s):  
Russell J. Best ◽  
Roger M. Bartlett ◽  
Richard A. Sawyer
Keyword(s):  
Experimental Studies ◽  
Three Dimensional ◽  
High Standard ◽  
Flight Simulation ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Simulation Research ◽  
Simulation Evaluation ◽  
Model And Simulation ◽  
Two Dimensional Model

This paper reports a study of the optimal release of men's and women's new and old rule javelins involving modeling, simulation, optimization (including sensitivity analysis), and simulation evaluation. Because of the lack of repro-ducibility in earlier results of two-dimensional flight simulation research, the paper presents a continuation of the two-dimensional model used previously. As expected, each javelin was found to have a different optimal release for a given individual, and the optimal release varied with the thrower's nominal release speed. A limited degree of simulation evaluation was achieved by comparison of the model and simulation results with measured throws. Within the constraints of measurement error, this tended to support both the adequacy of the two-dimensional model and the results of the simulations for such high standard throws. However, further experimental studies to quantify the angle of yaw (sideslip) in measured wind conditions are recommended to assess any changes needed to the two-dimensional model of javelin throwing and to determine the advisability of including this three-dimensional aspect of javelin release in future simulations.

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