光伏出力具有间歇性和波动性,利用储能装置可减小光伏并网对电网的影响。以平抑光伏功率波动效果为标准,提出了一种由超级电容和蓄电池组成的混合储能系统(hybrid energy storage system,HESS)的容量配置方法。采用由递推平均和中值平...光伏出力具有间歇性和波动性,利用储能装置可减小光伏并网对电网的影响。以平抑光伏功率波动效果为标准,提出了一种由超级电容和蓄电池组成的混合储能系统(hybrid energy storage system,HESS)的容量配置方法。采用由递推平均和中值平均加权滤波的算法平滑光伏出力,得到光伏并网功率和HESS参考功率。利用完全集合经验模态分解和希尔伯特变换提取HESS参考功率的高频与低频分量,对HESS内部功率进行一次分配。之后为了避免HESS荷电状态频繁越限,同时保证HESS能持续工作,提出一种HESS功率的均衡管理方法,对一次分配功率的衰减进行修正,再对修正后的HESS参考功率进行容量配置。最后,基于全寿命周期成本建立经济评估模型,对比不同的储能容量配置策略,利用实际数据仿真验证了所提方法的有效性与经济性。展开更多
In order to maintain vibration performances within the limits of the design, a vibration-based feature extraction method for dynamic characteristic using empirical mode decomposition （EMD） and wavelet analysis was p...In order to maintain vibration performances within the limits of the design, a vibration-based feature extraction method for dynamic characteristic using empirical mode decomposition （EMD） and wavelet analysis was proposed. The proposed method was verified experimentally and numerically by implementing the scheme on engine block. In the implementation process, the following steps were identified to be important： 1） EMD technique in order to solve the feature extraction of vibration signals; 2） Vibration measurement for the purpose of confirming the structural weak regions of engine block in experiment; 3） Finite element modeling for the purpose of determining dynamic characteristic in time region and frequency region to affirm the comparability of response character corresponding to improvement schemes; 4） Adopting a feature index oflMF for structural improvement based on EMD and wavelet analysis. The obtained results show that IMF of signal is more sensitive to response character corresponding to improvement schemes. Finally, examination of the results confirms that the proposed vibration-based feature extraction method is very robust, and focuses on the relative merits of modification and full-scale structural optimization of engine, together with the creation of new low-vibration designs.展开更多
文摘光伏出力具有间歇性和波动性,利用储能装置可减小光伏并网对电网的影响。以平抑光伏功率波动效果为标准,提出了一种由超级电容和蓄电池组成的混合储能系统(hybrid energy storage system,HESS)的容量配置方法。采用由递推平均和中值平均加权滤波的算法平滑光伏出力,得到光伏并网功率和HESS参考功率。利用完全集合经验模态分解和希尔伯特变换提取HESS参考功率的高频与低频分量,对HESS内部功率进行一次分配。之后为了避免HESS荷电状态频繁越限,同时保证HESS能持续工作,提出一种HESS功率的均衡管理方法,对一次分配功率的衰减进行修正,再对修正后的HESS参考功率进行容量配置。最后,基于全寿命周期成本建立经济评估模型,对比不同的储能容量配置策略,利用实际数据仿真验证了所提方法的有效性与经济性。
基金Project(50975192) supported by the National Natural Science Foundation of ChinaProject(10YFJZJC14100) supported by Tianjin Municipal Natural Science Foundation of China
文摘In order to maintain vibration performances within the limits of the design, a vibration-based feature extraction method for dynamic characteristic using empirical mode decomposition （EMD） and wavelet analysis was proposed. The proposed method was verified experimentally and numerically by implementing the scheme on engine block. In the implementation process, the following steps were identified to be important： 1） EMD technique in order to solve the feature extraction of vibration signals; 2） Vibration measurement for the purpose of confirming the structural weak regions of engine block in experiment; 3） Finite element modeling for the purpose of determining dynamic characteristic in time region and frequency region to affirm the comparability of response character corresponding to improvement schemes; 4） Adopting a feature index oflMF for structural improvement based on EMD and wavelet analysis. The obtained results show that IMF of signal is more sensitive to response character corresponding to improvement schemes. Finally, examination of the results confirms that the proposed vibration-based feature extraction method is very robust, and focuses on the relative merits of modification and full-scale structural optimization of engine, together with the creation of new low-vibration designs.
