摘要
海浪的非平稳特性会影响直驱式波浪发电系统能量捕获,为此提出基于脊线检测与变分非线性调频模式分解的控制方案。采用短时傅里叶变换方法分析波浪激励力,结合脊线检测设定初始频率;应用变分非线性调频模式分解法分离波浪激励力,获得若干模式分量并提取其瞬时频率;通过计算各模式分量的能量含量确定主导分量,根据其瞬时频率动态调整动力输出装置阻尼,搭建直驱式波浪发电系统模型。仿真结果表明,所提方案能量吸收性能好、输出平均功率高,可有效改善直驱式波浪发电装置性能。
In order to reduce the influence of wave non-smooth characteristics on the energy absorption of direct-drive wave power system,the ridge detection and variational nonlinear chirp mode decomposition is proposed as the control scheme.Using the short-time Fourier transform method to analyze the wave excitation force,the initial frequency is set combined with the ridge detection;using the variational nonlinear chirp mode decomposition method to separate the wave excitation force,obtain several mode components and extract their instantaneous frequencies.Through calculating the energy content of each mode component to determine the dominant component,the damping of the power output device is dynamically adjusted according to its instantaneous frequency to build a model of the direct-drive wave power generation system.Results of the simulation demonstrate that this proposal provides better energy absorption capability and more average power output,thus effectively increasing the power absorption performance of the direct-drive wave power system.
作者
罗琦
杨俊华
王超凡
黄逸
梁昊晖
Luo Qi;Yang Junhua;Wang Chaofan;Huang Yi;Liang Haohui(School of Automation,Guangdong University of Technology,Guangzhou 510006,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2023年第9期476-482,共7页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51370265)
广东省教育部产学研合作专项资金(2013B090500089)
广东省自然科学基金(2018A030313010)
广州市科技计划(202102021135)。
关键词
波浪发电系统
波能转换
脊线检测
变分非线性调频模式分解
功率优化
wave power system
wave energy conversion
ridge detection
variational nonlinear chirp mode decomposition
power optimization
