Multi-frequency dynamic performance of hydropower plant under coupling effect of power grid and turbine regulating system with surge tank

2021 ◽  
Vol 171 ◽  
pp. 557-581 ◽  
Author(s):  
Yang Liu ◽  
Wencheng Guo
Keyword(s):  
Coupling Effect ◽  
Power Grid ◽  
Dynamic Performance ◽  
Hydropower Plant ◽  
Surge Tank

scholarly journals Hysteresis Controlled Quadratic Boost Converter Based AC Micro Grid System with Improved Dynamic Response

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3327-3337
Keyword(s):  
Closed Loop ◽  
Power Grid ◽  
Dynamic Performance ◽  
Boost Converter ◽  
Open Loop ◽  
Grid System ◽  
Renewable Power ◽  
Renewable Power Generation ◽  
Hysteresis Controller ◽  
Micro Grid

Renewable power generation and enabling of AC Microgrids are fundamentally changing the traditional power grid. Microgrid has revealed its promising potential as an active subsystem of the modern power grid. This paper reviews and analyses ways to boost and regulate the voltage of the AC-Micro-Grid-System(QBCIMGS) for improving the microgrid power quality. “A QBC(Quadratic-boost-converter-inverter based AC-Micro-Grid-System(QBCIMGS) is conferred-here”. This work recommends-QBC(quadratic-boost-converter) between rectifier &inverter. This paper investigates open loop and closed loop response of Quadratic boost-converter based AC-Micro-Grid-System(MGS) with Proportional resonant(PR) & Hysteresis-controller(HC). The mat lab outcome attained illustrates a developed dynamic-performance by using Hysteresiscontrolled AC-Micro-Grid-System(MGS)

Bend-Twist Coupling Design and Evaluation of Spar Cap of Wind Turbine Compliance Blade

2010 ◽  
Vol 139-141 ◽  
pp. 1400-1405
Author(s):  
Wang Yu Liu ◽  
Yong Zhang
Keyword(s):  
Wind Turbine ◽  
Volume Fraction ◽  
Coupling Effect ◽  
Coupling Parameter ◽  
Dynamic Performance ◽  
Von Mises Stress ◽  
Hybrid Fibers ◽  
Fiber Volume ◽  
Plane Shear ◽  
The Impact

The bend-twist coupling design method of spar cap of 1.5MW wind turbine blade made by biased hybrid fibers is discussed, and the coupling parameter is established. It is found that flap-twist coupling effect is only related to the laminated materials, not sensitive to the geometry shape. When varying the angle of off-axis carbon fibers from 7.5° to 30° and the volume fraction from 10% to 90%, different bend-twist coupling effect can be obtained. The results show that the optimal angle of spar cap is closer to 18°, and of skins are about 13°. When constraints, such as fibers strain, the in-plane shear stress and Von Mises stress of static index, are added on the blade, the spar cap is optimized with about 45% carbon fiber volume fraction and 18° off-axis angle. Finally, the impact of natural frequencies of dynamic performance on the blade design is proved to be inessential.

Scheduling and value of pumped storage hydropower plant in Iran power grid based on fuel-saving in thermal units

2019 ◽  
Vol 24 ◽  
pp. 100753 ◽  
Author(s):  
Ali Karimi ◽  
Seyed Loghman Heydari ◽  
Farshad Kouchakmohseni ◽  
Mitra Naghiloo
Keyword(s):  
Power Grid ◽  
Hydropower Plant ◽  
Fuel Saving ◽  
Pumped Storage ◽  
Grid Based

Model Free Control of the Refrigeration System Based on Minimum Stable Superheat

2013 ◽  
Vol 397-400 ◽  
pp. 1373-1377
Author(s):  
Bao Hua Cheng ◽  
Ai Guo Wu ◽  
Yu Wen You
Keyword(s):  
Pid Control ◽  
Control Method ◽  
Coupling Effect ◽  
Dynamic Performance ◽  
Variable Load ◽  
Refrigeration System ◽  
Applied Model ◽  
Model Free ◽  
Model Free Control ◽  
Steady State Performance

This paper applied model free control method to the refrigeration system evaporator minimum stable superheat control. Compared with conventional PID control, model free control method has fast convergence, anti-interference ability. Meanwhile, model free control can reduce the coupling effect between evaporator superheat and evaporating temperature and be well adapted to the variable load control requirements of the refrigeration system, which has good steady state performance and dynamic performance.

scholarly journals A Hybrid System Approach to the Analysis and Design of Power Grid Dynamic Performance

2012 ◽  
Vol 100 (1) ◽  
pp. 225-239 ◽  
Author(s):  
Yoshihiko Susuki ◽  
T. John Koo ◽  
Hiroaki Ebina ◽  
Takuya Yamazaki ◽  
Takashi Ochi ◽  
...  
Keyword(s):  
Hybrid System ◽  
System Approach ◽  
Power Grid ◽  
Dynamic Performance ◽  
Analysis And Design
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