摘要
为提升新能源电网环境下水力发电机组的整体运行平稳性,提出基于滑模控制的新能源电网环境下水力发电机组控制方法。构建新能源电网环境下水力发电机组数学模型,通过定义滑模动态并设计滑模控制器,实现了对所构建发电机组数学模型的滑模变结构控制。为提升控制的稳定性,将模糊控制引入到滑模变结构控制中,设计模糊滑模控制器,通过运用模糊控制规则有效削弱滑模变结构控制过程中产生的抖振问题,降低抖振对新能源电网环境下水力发电机组造成的危害。结果表明:该方法实施控制时,试验发电机组仅在启动之后的0.3 s左右,其转速便可到达给定的稳定转速;并经过0.25 s左右的时间便能够令试验发电机组恢复到给定转速;当第0.9 s施加扰动信号时,在该方法控制下试验发电机组的转矩波动不明显,且能够快速恢复平稳。该方法能够实现对新能源电网环境下水力发电机组启动与负载扰动下的转速平稳控制,具有较好的启动性能与鲁棒性,可有效控制存在扰动信号下发电机组的电流与转矩,且控制响应速度高,能够有效削弱抖振幅度,整体控制效果理想,控制中未出现超调现象,能够实现对负载扰动的优越控制,控制性能稳定。
In order to improve the overall operation smoothness of hydropower unit in the new energy power grid environment, a sliding mode-based control method for hydropower unit in the new energy grid environment is proposed, for which the mathematical model of hydropower unit in the new energy power grid environment is established, and then the sliding mode variable structure control of the established mathematical model is realized through defining the sliding mode dynamics and designing the relevant sliding mode controller. For improving the stability of the control, the relevant fuzzy control is introduced into the sliding mode variable structure control for designing the fuzzy sliding mode controller, and then the problem of chattering from the process of the sliding mode variable structure control is effectively weakened through the application of the fuzzy control rule, thus the chattering harm on the hydropower unit in the new energy grid environment is to be lowered. The result shows that the rotation speed of the testing hydropower unit can reach to the given stable rotation speed only after 0.3 s of the starting and can be recovered to the given rotation speed after 0.25 s when the control is conducted with this method, while the torque fluctuation of the testing hydropower unit is not significant and can be quickly recovered to be stable when the disturbance signal is applied at the 0.9 s under the control of this method. This method can realize the stable control of the rotation speed of the hydropower unit under the conditions start-up and load disturbance in the new energy power grid environment with better start-up performance and robustness, thus can effectively control the electric current and torque of the hydropower unit under the condition with disturbance signals by high control response speed, while it can effectively reduce the chattering amplitude with an ideal overall control effect and without any over-control phenomena and then can realize a superior control of load disturbance with stable control performance.
作者
黄鑫
王婕
邢侃
HUANG Xin;WANG Jie;XING Kan(School of Electric-mechanical Engineering and Automation,Tianjin Vocational Institute,Tianjin 300410,China;School of Engineering Artificial Intelligence and Data Science,Hebei University of Technology,Tianjin 300130,China;Gezhouba Hydropower Plant,China Yangtze Power Co.,Ltd.,Yichang 443000,Hubei,China)
出处
《水利水电技术》
北大核心
2020年第12期141-149,共9页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(61703134)
河北省高等学校科学技术研究项目(QN2015068)
河北省自然科学基金项目(F2019202369)
河北省教育厅重点项目(ZD2016071)。
关键词
滑模控制
新能源
水力发电机组
数学模型
滑模动态
滑模控制器
模糊控制
抖振
sliding mode control
new energy sources
hydropower unit
mathematical model
sliding mode dynamics
sliding mode controller
fuzzy control
chattering
