|
CSME 2018/08
Volume 39 No.4
:
385-396
|
|
Research on Compensating Electromagnetic Torque Fluctuation of Hydraulic Wind Turbine During Low Voltage Ride Through
Chao Aia, Xuan Liu, Han-Chao Chen, Ya-Lun Wang and Xiang-Dong Konga
aKey Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University), Ministry of Education of China，Qinhuangdao 066004, China; Yanshan University Hebei Heavy Machinery Fluid Power Transmission and Control Lab, Qinhuangdao 066004, China.
|
Abstract:
Since the wind farms are increasing rapidly, sets of specific requirements have been established in China. Its objective is to ensure the stability of power system. So this paper takes the hydraulic wind turbine (HWT) as research object, aiming at enhancing the ability of low voltage ride through (LVRT) of HWT. In the paper, one basic problem, how to compensate the fluctuating electromagnetic torque, is studied. To begin with, the working principle of the HWT is analyzed, and mathematical models of every part of HWT are established. Then prediction state observer based on time-delay and a method relied on adjusting the proportional throttle valve opening size to dynamic compensating electromagnetic torque fluctuation are presented. In order to avoid the damage caused by the LVRT in actual operation, the operating characteristics of HWT under low voltage condition are simulated based on MATLAB and AMESim. As verified by the experiment and simulation, the prediction results of electromagnetic torque state observer and the dynamic compensation method can promise the HWT to handle the fluctuation, the performances of HWT during LVRT with the dynamic compensation method is much better than that without. The stability of the HWT and grid power system is evaluated.
|
|
Keywords: hydraulic wind turbine (HWT), low voltage ride through (LVRT), electromagnetic torque, state observer.
|
Download PDF
|
|
*Corresponding author; e-mail:
|
©
2018
CSME , ISSN 0257-9731
|