改进的风电机组转矩控制策略  

Improved torque control strategy for wind turbines

作　　者：许瑾 邓巍[1] 李春廷 李东林 史祥 王英丞 XU Jin;DENG Wei;LI Chunting;LI Donglin;SHI Xiang;WANG Yingcheng(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Huaneng New Energy Co.,Ltd.,Beijing 100036,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]华能新能源股份有限公司,北京100036

出　　处：《热力发电》2023年第3期160-167,共8页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ18-H33)。

摘　　要：风电机组的变桨控制和转矩控制均基于转速信号设计,二者在额定转速附近发生耦合,造成转速波动,传统转矩控制将依据转速频繁进行控制逻辑切换,致使转速、功率大幅跌落;且在额定风速以上,传统转矩控制包含恒转矩和恒功率策略,二者在转矩、功率、传动链载荷方面各有优劣。为此,引入与桨距角相关的状态变量对转矩控制在额定转速附近的区域切换逻辑加以限制,并将转矩-转速控制曲线中的功率满发曲线段扩充到发电机额定转速以下的区域,以消除因转矩控制的区域频繁切换引起的转矩和功率跌落;然后,对转矩-转速控制曲线中的功率满发曲线段进行权值规划,兼顾风电机组额定转速附近的功率、转矩波动性能,并对连接最佳叶尖速比曲线段和功率满发曲线段间的过渡曲线进行动态优化。在典型湍流工况下对所提出的方法进行仿真验证,结果表明:改进的转矩控制策略提升了额定风速附近的风能捕获效率,消除了高风速区发电机转矩和功率跌落现象,合理地权值规划能兼顾转矩和功率性能。For wind power units, both torque control and pitch control are designed based on generator speed, which leads to the coupling between them near the rated speed, further resulting in rotational speed disturbances.Consequently, conventional torque control will frequently change the control logic according to generator speed,thereby causing the torque and power dips. Besides, two kinds of conventional torque control strategies above the nominal wind, constant-torque and constant-power control, have advantages and disadvantages in torque, power and drive-train loads. In order to eliminate the torque and power dips, full load curve was extended to generator speeds below the rated value. Several state variables, relevant to pitch angle, were selected to reduce the frequency of switching the torque control regions near the rated speed. A new full load curve was designed based on weight programming to comprehensively consider the power and torque performances. The transition curve connecting the optimum Lambda curve and full load curve, was optimized dynamically. Moreover, the proposed control strategy was tested under typical turbulent wind conditions. The simulation results show that, the torque and power dips at above nominal wind are eliminated and the power capture increases at rated wind by using the improved torque control strategy. Furthermore, both torque and power achieves good performance by applying the rational weight.

关 键 词：风电机组 转矩控制 逻辑切换 权值规划 

分 类 号：TM315[电气工程—电机] TP273[自动化与计算机技术—检测技术与自动化装置]