并网光伏系统通常以最大功率模式运行,无法全面响应电网调节需求,因此需要研究功率备用控制(power reserve control,PRC)。基于最大功率点估计(maximum power point estimation,MPPE)的PRC利用光伏等效模型,通过数据拟合实现MPPE,从而...并网光伏系统通常以最大功率模式运行,无法全面响应电网调节需求,因此需要研究功率备用控制(power reserve control,PRC)。基于最大功率点估计(maximum power point estimation,MPPE)的PRC利用光伏等效模型,通过数据拟合实现MPPE,从而实现光伏功率备用。然而,随着光伏组件老化,MPPE估计误差增大,可能影响系统安全稳定运行。文中提出考虑光伏组件老化时MPPE模型参数校准的光伏系统PRC。首先提出基于麻雀搜索算法的MPPE模型参数校准方法,然后根据光伏组件老化特性和MPPE误差演变趋势,提出MPPE模型校准的改进评价指标和校准周期整定原则,最后将其应用于基于MPPE的PRC中。仿真结果表明,该方法能够实现光伏组件老化后MPPE模型参数自动校准,并且显著提高了MPPE精度,增强了PRC在实际应用中的可靠性。展开更多
A model for liquid-gas flow （MLGF）, considering the flee movement of liquid surface, was built to simulate the wastewater velocity field and gas distribution in a full-scale Caroussel oxidation ditch with surface ae...A model for liquid-gas flow （MLGF）, considering the flee movement of liquid surface, was built to simulate the wastewater velocity field and gas distribution in a full-scale Caroussel oxidation ditch with surface aeration. It was calibrated and validated by field measurement data, and the calibrated parameters and sections were selected based on both model analysis and numerical computation. The simulated velocities of MLGF were compared to that of a model for wastewater-sludge flow （MWSF）. The results show that the free liquid surface considered in MLGF improves the simulated velocity results of upper layer and surface. Moreover, distribution of gas volume fraction （GVF） simulated by MLGF was compared to dissolved oxygen （DO） measured in the oxidation ditch. It is shown that DO distribution is affected by many factors besides GVF distribution.展开更多
文摘并网光伏系统通常以最大功率模式运行,无法全面响应电网调节需求,因此需要研究功率备用控制(power reserve control,PRC)。基于最大功率点估计(maximum power point estimation,MPPE)的PRC利用光伏等效模型,通过数据拟合实现MPPE,从而实现光伏功率备用。然而,随着光伏组件老化,MPPE估计误差增大,可能影响系统安全稳定运行。文中提出考虑光伏组件老化时MPPE模型参数校准的光伏系统PRC。首先提出基于麻雀搜索算法的MPPE模型参数校准方法,然后根据光伏组件老化特性和MPPE误差演变趋势,提出MPPE模型校准的改进评价指标和校准周期整定原则,最后将其应用于基于MPPE的PRC中。仿真结果表明,该方法能够实现光伏组件老化后MPPE模型参数自动校准,并且显著提高了MPPE精度,增强了PRC在实际应用中的可靠性。
基金Project supported by Visiting Scholar Foundation of Key Laboratory of the Resources Exploitation and Environmental Disaster Control Engineering in Southwest China (Chongqing University),Ministry of Education,China
文摘A model for liquid-gas flow （MLGF）, considering the flee movement of liquid surface, was built to simulate the wastewater velocity field and gas distribution in a full-scale Caroussel oxidation ditch with surface aeration. It was calibrated and validated by field measurement data, and the calibrated parameters and sections were selected based on both model analysis and numerical computation. The simulated velocities of MLGF were compared to that of a model for wastewater-sludge flow （MWSF）. The results show that the free liquid surface considered in MLGF improves the simulated velocity results of upper layer and surface. Moreover, distribution of gas volume fraction （GVF） simulated by MLGF was compared to dissolved oxygen （DO） measured in the oxidation ditch. It is shown that DO distribution is affected by many factors besides GVF distribution.
