混合实时仿真技术又称为硬件在环(Hardware In the Loop,HIL)仿真技术作为新兴的仿真技术,受到广泛的关注,其突出的可靠性与准确性已被证明是电力系统规划、设计、装置测试及新能源并网测试等方面的有效手段,然而稳定性与精度问题是HIL...混合实时仿真技术又称为硬件在环(Hardware In the Loop,HIL)仿真技术作为新兴的仿真技术,受到广泛的关注,其突出的可靠性与准确性已被证明是电力系统规划、设计、装置测试及新能源并网测试等方面的有效手段,然而稳定性与精度问题是HIL仿真技术的关键指标,为了改变HIL仿真的稳定性与精度,提出了几种不同的HIL仿真接口算法,并建立HIL仿真系统模型,分析其稳定性与精度。并分析比较几种不同接口算法对原系统的稳定性与精度的改进,得出最佳的功率接口算法,最终通过仿真来验证所提出的功率接口算法的有效性与准确性。具有极强的工程使用价值,为硬件在环仿真技术的研究、发展提供了基本保障和良好的平台。展开更多
[Objective] This study was carried out to explore the effect of poly-β-hydroxybutyrate（PHB） on the performance of the nonspecific immune system in Fenneropenaeus chinensis. [Method] F. chinensis individuals were as...[Objective] This study was carried out to explore the effect of poly-β-hydroxybutyrate（PHB） on the performance of the nonspecific immune system in Fenneropenaeus chinensis. [Method] F. chinensis individuals were assigned into six groups, and each group was fed with a diet containing 0（Control）, 0.5%（Group E0.5）, 1.0%（Group E1.0）, 2.5%（Group E2.5）, 5.0%（Group E5.0） or 10.0% PHB（Group E10.0）. The mortality rate and relative percent of survival（RPS） of each group were calculated after 6 weeks. Meanwhile, the total antioxidant capacity（T-AOC）, the activity of acid phosphatase（ACP）, peroxidase（POD） and catalase（CAT）, and the content of malondialdehyde（MDA） in hepatopancreas and serum were measured,and their correlation with PHB concentration was analyzed. [Result] The RPS in PHB treated shrimps increased initially and decreased subsequently with increasing PHB concentration. RPS of Group E1.0 was the highest, showing significant difference from that of other groups（ P 〈0.05）.With the increase in PHB concentration, the activity of immunity related enzymes changed in a similar pattern with RPS： increasing at first and decreasing subsequently. In addition, the activity of the enzymes was elevated in the 2nd and 3rd weeks of PHB administration. Among them, T-AOC in serum of groups E1.0 and E2.5, T-AOC in hepatopancreas of Group E1.0, ACP activity in serum of groups E1.0 and E2.5, ACP activity in hepatopancreas of Group E1.0, CAT activity in groups E0.5, E1.0 and E2.5, CAT activity in hepatopancreas of groups E0.5, E1.0 and E10.0, POD activity in both serum and hepatopancreas of groups E0.5, E1.0 and E2.5, SOD activity in both serum and hepatopancreas of Group E1.0, MDA content in serum of Group E1.0 and MDA content in hepatopancreas of groups E0.5 and E1.0 showed significant difference from those of other groups（P〈0.05）. [Conclusion] PHB can improve the immunity of F. chinensis, 1.0% in feed has the best effect, and the total enzyme activity reaches the hi展开更多
Sense and Sensibility,one of Jane Austen's masterpieces,has undergone a long time study and the two sisters in the book—Elinor and Marianne have been researched from various kinds of perspectives except"mela...Sense and Sensibility,one of Jane Austen's masterpieces,has undergone a long time study and the two sisters in the book—Elinor and Marianne have been researched from various kinds of perspectives except"melancholy philosophy".This paper aims to analyze the two sisters in Sense and Sensibility under the guidance of"melancholy philosophy".展开更多
全球领先的PA66树脂和化学中间体生产商奥升德高性能材料有限公司日前宣布任命Phil Mc Divitt担任聚酰胺业务总裁。作为全球聚酰胺业务的负责人,Phil Mc Divitt将在美国休斯敦的奥升德总部任职,领导聚酰胺业务的三个生产基地和1800余名...全球领先的PA66树脂和化学中间体生产商奥升德高性能材料有限公司日前宣布任命Phil Mc Divitt担任聚酰胺业务总裁。作为全球聚酰胺业务的负责人,Phil Mc Divitt将在美国休斯敦的奥升德总部任职,领导聚酰胺业务的三个生产基地和1800余名员工。同时他也将成为奥升德管理团队的一员,向公司首席执行官Fred Poses汇报。展开更多
This paper presents the power hardware in the loop(PHIL)validation of a feed forward DC voltage control scheme for the fault ride through(FRT)of voltage source converter(VSC)high voltage DC(HVDC)connected offshore win...This paper presents the power hardware in the loop(PHIL)validation of a feed forward DC voltage control scheme for the fault ride through(FRT)of voltage source converter(VSC)high voltage DC(HVDC)connected offshore wind power plants(WPPs).In the proposed FRT scheme,the WPP collector network AC voltage is actively controlled by considering both the DC voltage error and the AC current from the WPP AC collector system which ensures fast and robust FRT of the VSC HVDC connected offshore WPPs.The PHIL tests were carried out in order to verify the efficacy of the proposed feed forward DC voltage control scheme for enhancing the FRT capability of the VSC HVDC connected WPPs.The PHIL test results have demonstrated the proper control coordination between the offshore WPP and the WPP side VSC and the efficient FRT of the VSC HVDC connected WPPs.展开更多
功率接口装置作为连接数字仿真与被测实物的重要环节,对于功率硬件在环(PHIL)仿真技术的稳定性与精度起到决定性作用。基于PHIL接口等效建模理论,建立PHIL的电路模型,分析其稳定性;基于重复控制理论,设计功率接口控制策略,保证仿真稳定...功率接口装置作为连接数字仿真与被测实物的重要环节,对于功率硬件在环(PHIL)仿真技术的稳定性与精度起到决定性作用。基于PHIL接口等效建模理论,建立PHIL的电路模型,分析其稳定性;基于重复控制理论,设计功率接口控制策略,保证仿真稳定性与精度;加入电压外环P控制,提高动态性能。搭建PHIL仿真试验平台,以380 V、50 k W功率接口装置实现了复杂系统的混合实时仿真,且稳态特性好、动态响应快、鲁棒性强。展开更多
文摘混合实时仿真技术又称为硬件在环(Hardware In the Loop,HIL)仿真技术作为新兴的仿真技术,受到广泛的关注,其突出的可靠性与准确性已被证明是电力系统规划、设计、装置测试及新能源并网测试等方面的有效手段,然而稳定性与精度问题是HIL仿真技术的关键指标,为了改变HIL仿真的稳定性与精度,提出了几种不同的HIL仿真接口算法,并建立HIL仿真系统模型,分析其稳定性与精度。并分析比较几种不同接口算法对原系统的稳定性与精度的改进,得出最佳的功率接口算法,最终通过仿真来验证所提出的功率接口算法的有效性与准确性。具有极强的工程使用价值,为硬件在环仿真技术的研究、发展提供了基本保障和良好的平台。
基金Supported by Central Public-interest Scientific Institution Basal Research Fund,Yellow Sea Fisheries Research Institute,CAFS(20603022017001)National Natural Science Foundation of China(41676148)+1 种基金Taishan Scholar Program for Seed IndustryChina Agriculture Research System(CARS-48)
文摘[Objective] This study was carried out to explore the effect of poly-β-hydroxybutyrate（PHB） on the performance of the nonspecific immune system in Fenneropenaeus chinensis. [Method] F. chinensis individuals were assigned into six groups, and each group was fed with a diet containing 0（Control）, 0.5%（Group E0.5）, 1.0%（Group E1.0）, 2.5%（Group E2.5）, 5.0%（Group E5.0） or 10.0% PHB（Group E10.0）. The mortality rate and relative percent of survival（RPS） of each group were calculated after 6 weeks. Meanwhile, the total antioxidant capacity（T-AOC）, the activity of acid phosphatase（ACP）, peroxidase（POD） and catalase（CAT）, and the content of malondialdehyde（MDA） in hepatopancreas and serum were measured,and their correlation with PHB concentration was analyzed. [Result] The RPS in PHB treated shrimps increased initially and decreased subsequently with increasing PHB concentration. RPS of Group E1.0 was the highest, showing significant difference from that of other groups（ P 〈0.05）.With the increase in PHB concentration, the activity of immunity related enzymes changed in a similar pattern with RPS： increasing at first and decreasing subsequently. In addition, the activity of the enzymes was elevated in the 2nd and 3rd weeks of PHB administration. Among them, T-AOC in serum of groups E1.0 and E2.5, T-AOC in hepatopancreas of Group E1.0, ACP activity in serum of groups E1.0 and E2.5, ACP activity in hepatopancreas of Group E1.0, CAT activity in groups E0.5, E1.0 and E2.5, CAT activity in hepatopancreas of groups E0.5, E1.0 and E10.0, POD activity in both serum and hepatopancreas of groups E0.5, E1.0 and E2.5, SOD activity in both serum and hepatopancreas of Group E1.0, MDA content in serum of Group E1.0 and MDA content in hepatopancreas of groups E0.5 and E1.0 showed significant difference from those of other groups（P〈0.05）. [Conclusion] PHB can improve the immunity of F. chinensis, 1.0% in feed has the best effect, and the total enzyme activity reaches the hi
文摘Sense and Sensibility,one of Jane Austen's masterpieces,has undergone a long time study and the two sisters in the book—Elinor and Marianne have been researched from various kinds of perspectives except"melancholy philosophy".This paper aims to analyze the two sisters in Sense and Sensibility under the guidance of"melancholy philosophy".
文摘全球领先的PA66树脂和化学中间体生产商奥升德高性能材料有限公司日前宣布任命Phil Mc Divitt担任聚酰胺业务总裁。作为全球聚酰胺业务的负责人,Phil Mc Divitt将在美国休斯敦的奥升德总部任职,领导聚酰胺业务的三个生产基地和1800余名员工。同时他也将成为奥升德管理团队的一员,向公司首席执行官Fred Poses汇报。
文摘This paper presents the power hardware in the loop(PHIL)validation of a feed forward DC voltage control scheme for the fault ride through(FRT)of voltage source converter(VSC)high voltage DC(HVDC)connected offshore wind power plants(WPPs).In the proposed FRT scheme,the WPP collector network AC voltage is actively controlled by considering both the DC voltage error and the AC current from the WPP AC collector system which ensures fast and robust FRT of the VSC HVDC connected offshore WPPs.The PHIL tests were carried out in order to verify the efficacy of the proposed feed forward DC voltage control scheme for enhancing the FRT capability of the VSC HVDC connected WPPs.The PHIL test results have demonstrated the proper control coordination between the offshore WPP and the WPP side VSC and the efficient FRT of the VSC HVDC connected WPPs.
文摘功率接口装置作为连接数字仿真与被测实物的重要环节,对于功率硬件在环(PHIL)仿真技术的稳定性与精度起到决定性作用。基于PHIL接口等效建模理论,建立PHIL的电路模型,分析其稳定性;基于重复控制理论,设计功率接口控制策略,保证仿真稳定性与精度;加入电压外环P控制,提高动态性能。搭建PHIL仿真试验平台,以380 V、50 k W功率接口装置实现了复杂系统的混合实时仿真,且稳态特性好、动态响应快、鲁棒性强。
