Synthesis and Analysis of a Parallel-Type Independently Controllable Transmission Mechanism

2016 ◽  
Vol 8 (4) ◽  
Author(s):  
Guan-Shong Hwang ◽  
Wei-Hsiang Liao ◽  
Der-Min Tsay ◽  
Bor-Jeng Lin
Keyword(s):  
Power Flow ◽  
Transmission Mechanism ◽  
Variable Speed ◽  
Constant Frequency ◽  
Torque Distribution ◽  
Input Shaft ◽  
Variable Speed Wind Turbine ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Parallel Type

This study proposes an innovative transmission mechanism, called parallel-type independently controllable transmission (ICT). The proposed mechanism can provide functions similar to those of infinitely variable transmission (IVT) or continuously variable transmission (CVT) mechanisms. The parallel-type ICT can transmit rotational output speed that can be independently regulated using a controller and is unaffected by the speed variation of the input shaft. Thus, a variable speed wind turbine can generate electricity with a constant frequency and improved quality. The kinematic characteristics, torque distribution, and power flow of this transmission mechanism were verified using a prototype of the ICT to demonstrate the feasibility of its application.

Design of a Series-Type Independently Controllable Transmission Mechanism

2012 ◽  
Author(s):  
Guan-Shyong Hwang ◽  
Der-Min Tsay ◽  
Jao-Hwa Kuang ◽  
Tzuen-Lih Chern ◽  
Tsu-Chi Kuo
Keyword(s):  
Angular Velocity ◽  
Planetary Gear ◽  
Transmission Mechanism ◽  
Alternative Form ◽  
Input Shaft ◽  
Planetary Gear Trains ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Gear Trains ◽  
Series Type

This study proposes a design of transmission mechanism which is referred to as a series-type independently controllable transmission (ICT). The series-type ICT is an alternative form of the parallel-types proposed in the former researches. The series-type ICT can serve as a continuously or an infinitely variable transmission mechanism, and it can also produce a required angular output velocity that can be independently manipulated by a controller and not affected by the angular velocity of the input shaft. The series-type ICT mechanism is composed of two planetary gear trains and two transmission-connecting members. Kinematic and dynamic characteristics of the ICT mechanism are analyzed and their analytical equations are derived for application in this study.

Kinematic and Dynamic Analyses of a Series-Type Independently Controllable Transmission Mechanism

2012 ◽  
Vol 579 ◽  
pp. 483-493
Author(s):  
Guan Shyong Hwang ◽  
Der Min Tsay ◽  
Jao Hwa Kuang ◽  
Tzuen Lih Chern
Keyword(s):  
Power Systems ◽  
Planetary Gear ◽  
Transmission Mechanism ◽  
Alternative Form ◽  
Constant Frequency ◽  
Input Shaft ◽  
Variable Transmission ◽  
Wind Power Systems ◽  
Series Type ◽  
Turbine Speed

An innovative transmission mechanism, referred to as a series-type independently controllable transmission (ICT), is proposed in this study. The series-type ICT is an alternative form of the parallel-type ICT proposed in the former researches. It can provide performing functions similar to those of an infinitely variable transmission (IVT) or a continuously variable transmission (CVT), and produce a required and desired angular output velocity that is independently manipulated by a controller and does not depend on the angular velocity of the input shaft. While being applied to variable speed wind power systems, the ICT mechanisms could overcome turbine speed fluctuations and provide a constant speed output to the generator to generate electricity with constant frequency. The series-type ICT is composed of two planetary gear trains and two transmission-connecting members. Kinematic and dynamic characteristics of the series-type ICT are investigated and analyzed, and their analytical equations are also derived for application.

Design and Analysis of a Novel Power-Split Infinitely Variable Power Transmission System

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Ender İnce ◽  
Mehmet A. Güler
Keyword(s):  
Power Flow ◽  
Power Transmission ◽  
Mechanical Efficiency ◽  
Flow Equations ◽  
Power Split ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Variable Power ◽  
New System ◽  
Agricultural Machines

In the last few decades, power-split infinitely variable transmission (IVT) systems have attracted considerable attention as they ensure high driving comfort with high total efficiencies, especially in off-highway vehicles and agricultural machines. In this study, a novel power-split-input-coupled IVT system is developed. The effects of various dynamic parameters such as power flow and Willis transmission ratio on the mechanical efficiency of the systems are investigated. Kinematic analysis of the new system has been carried out. In addition power flow equations are derived as functions of the power that flows through the infinitely variable unit (IVU). The results indicate that the main parameters, which are strictly related to mechanical efficiency are the power and torque flows through the IVU.

Methods for Controlling a Wind Turbine System With a Continuously Variable Transmission in Region 2

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Andrew H. Rex ◽  
Kathryn E. Johnson
Keyword(s):  
Wind Turbine ◽  
Gear Ratio ◽  
Continuously Variable Transmission ◽  
Variable Speed ◽  
Wind Turbine System ◽  
Variable Speed Wind Turbine ◽  
Fast Wind ◽  
Variable Transmission ◽  
Integral Controller ◽  
Proportional Integral Controller

Variable speed operation enables wind turbine systems to increase their aerodynamic efficiency and reduce fatigue loads. An alternative to the current electrically based variable speed technologies is the continuously variable transmission (CVT). A CVT is a transmission whose gear ratio can be adjusted to take on an infinite number of settings within the range between its upper and lower limits. CVT research in wind turbine applications predicts an improvement in output power and torque loads compared with fixed-speed machines. Also, a reduction in the harmonic content of the currents is anticipated by eliminating the power electronics. This paper develops a model that combines a CVT model with the FAST wind turbine simulator for simulating the system’s performance in MATLAB/SIMULINK. This model is useful for control development for a variable-speed wind turbine using a CVT. The wind turbine with CVT is simulated using two controllers: a proportional-integral controller and a nonlinear torque controller of the type commonly used in the wind industry.

The Research of Variable Speed Constant Frequency Wind Power Generation Technology

2014 ◽  
Vol 986-987 ◽  
pp. 619-621
Author(s):  
Yuan Fei ◽  
Quan Liu ◽  
Yong Chen
Keyword(s):  
Wind Power ◽  
Frequency Control ◽  
Speed Ratio ◽  
Variable Speed ◽  
Paper Briefly ◽  
Constant Frequency ◽  
Variable Speed Wind Turbine ◽  
Variable Speed Constant Frequency ◽  
Power Generation Technology ◽  
Generation Technology

This paper briefly introduces the characteristics of wind power technology and its development process, Through data comparison, demonstrate the superiority of the variable speed wind turbine operation. In keeping the best tip speed ratio, the variable speed constant frequency control for the biggest wind power.

Kinematical Analysis of a Novel Transmission Mechanism With Steady-Speed Output for Variable Speed Wind Turbines

2010 ◽  
Author(s):  
Guan-Shyong Hwang ◽  
Der-Min Tsay ◽  
Jao-Hwa Kuang ◽  
Tzuen-Lih Chern
Keyword(s):  
Angular Velocity ◽  
Power Systems ◽  
Wind Turbines ◽  
Engineering Application ◽  
Planetary Gear ◽  
Transmission Mechanism ◽  
Variable Speed ◽  
Input Shaft ◽  
Gear Trains ◽  
Wind Power Systems

For the usage in variable speed wind turbines, a novel transmission mechanism with steady-speed output is proposed in this study. The proposed mechanism, named as independently controllable transmission (ICT), can produce a required angular velocity at the output shaft, which is independently manipulated by a controller and does not depend on the angular velocity of the input shaft. By applying the ICT mechanism to the variable speed wind power systems, the turbine fluctuation can be overcome and a constant speed can be provided for the input shaft of the generator. The ICT mechanism is fundamentally composed of two sets of planetary gear trains and two sets of transmission-connecting members. Four prototypes of the ICT mechanisms are installed to experiment their kinematical characteristics and to demonstrate their feasibility of engineering application.

scholarly journals Transient and steady state performance analysis of power flow control in a DFIG variable speed wind turbine

2017 ◽  
Vol 68 (1) ◽  
pp. 31-38
Author(s):  
Cajethan M. Nwosu ◽  
Stephen E. Oti ◽  
Cosmas U. Ogbuka
Keyword(s):  
Steady State ◽  
Performance Analysis ◽  
Wind Turbine ◽  
Power Flow ◽  
Variable Speed ◽  
Power Flow Control ◽  
Variable Speed Wind Turbine ◽  
Speed Mode ◽  
Transient And Steady State ◽  
Steady State Performance

Abstract This paper presents transient and steady state performance analysis of power flow control in a 5.0 kW Doubly-Fed Induction Generator (DFIG) Variable Speed Wind Turbine (VSWT) under sub synchronous speed, super synchronous speed and synchronous speed modes of operation. Stator flux orientation is used for the control of the rotor-side converter (RSC) and DFIG whereas the grid (or stator) voltage orientation is the preferred choice for the control of the grid-side converter (GSC). In each of the three speeds modes, power is always supplied to the grid through the stator of the DFIG. The magnitude of net power (stator power plus rotor power) is less than stator power during the sub synchronous speed mode; it is greater than stator power during the super synchronous speed mode while it is equal to the stator power during the synchronous speed mode. In synchronous speed mode, the rotor power is zero indicating that power is neither supplied to the grid from the rotor nor supplied to the rotor from the grid; here the magnitude of net power is equal to stator power. The simulation results thus obtained in a MATLAB/SIMULINK environment laid credence to the controllability of power flow reversal in a DFIG-VSWT through back-to-back power electronic converter.

Dynamic Analysis of a Geared Infinitely Variable Transmission

2016 ◽  
Vol 12 (3) ◽  
Author(s):  
X. F. Wang ◽  
Z. R. Li ◽  
W. D. Zhu
Keyword(s):  
Dynamic Analysis ◽  
Speed Ratio ◽  
Force Analysis ◽  
Maximum Torque ◽  
Input Shaft ◽  
Continuous Output ◽  
Input Side ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Output Side

Dynamic analysis of a geared infinitely variable transmission (IVT) that can generate a continuous output-to-input speed ratio from zero to a certain value is studied for vehicle and wind turbine applications. With the IVT considered as a multirigid-body system, the Lagrangian approach is used to analyze its speeds and accelerations, and the Newtonian approach is used to conduct force analysis of each part of the IVT. Instantaneous input and output speeds and accelerations of the IVT have variations in one rotation of its input shaft. This work shows that the instantaneous input speed has less variation than the instantaneous output speed when the inertia on the input side is larger than that on the output side and vice versa. The maximum torque on the output shaft that is a critical part of the IVT increases with the input speed.

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