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Probabilistic Global Maximum Power Point Tracking Algorithm for Continuously Varying Partial Shading Conditions on Autonomous PV Systems

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Energy and Power Engineering 2024年第1期16卷 21-42页

作者： kha.Bao kha.h Cao Vincent Boitier LAAS-CNRS University of Toulouse Toulouse France

A photovoltaic (PV) string with multiple modules with bypass diodes frequently deployed on a variety of autonomous PV systems may present multiple power peaks under uneven shading. For optimal solar harvesting, there is a need for a control schema to force the PV string to operate at global maximum power point (GMPP). While a lot of tracking methods have been proposed in the literature, they are usually complex and do not fully take advantage of the available characteristics of the PV array. This work highlights how the voltage at operating point and the forward voltage of the bypass diode are considered to design a global maximum power point tracking (GMPPT) algorithm with a very limited global search phase called Fast GMPPT. This algorithm successfully tracks GMPP between 94% and 98% of the time under a theoretical evaluation. It is then compared against Perturb and Observe, Deterministic Particle Swarm Optimization, and Grey Wolf Optimization under a sequence of irradiance steps as well as a power-over-voltage characteristics profile that mimics the electrical characteristics of a PV string under varying partial shading conditions. Overall, the simulation with the sequence of irradiance steps shows that while Fast GMPPT does not have the best convergence time, it has an excellent convergence rate as well as causes the least amount of power loss during the global search phase. Experimental test under varying partial shading conditions shows that while the GMPPT proposal is simple and lightweight, it is very performant under a wide range of dynamically varying partial shading conditions and boasts the best energy efficiency (94.74%) out of the 4 tested algorithms.

关键词： Photovoltaic PV Global Maximum Power Point Tracking GMPPT Fast Varying Partial Shading Conditions Autonomous PV Systems GMPPT Review

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应用压力恢复测试法检测水和气的推进前沿

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油气田开发工程译丛 1992年第12期 13-17页

作者：赵钧 kha.,AAW

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胡芦巴胶对混合粉制面包及生面团品质的影响

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无锡轻工大学学报（食品与生物技术） 1998年第4期17卷 36-40页

作者： kha.,AMM 丁霄霖无锡轻工大学食品学院

去皮高粱粉和粟米粉作面包用粉的替代物，以不同比例添加使用。胡芦巴胶部分替代面粉，替代率可达０．９％，研究了胡芦巴胶对流变特征及面包品质的影响。添加胶越多，生面团吸水量亦越高；添加胡芦巴胶后，生面团的稳定时间、断裂时间... 详细信息

去皮高粱粉和粟米粉作面包用粉的替代物，以不同比例添加使用。胡芦巴胶部分替代面粉，替代率可达０．９％，研究了胡芦巴胶对流变特征及面包品质的影响。添加胶越多，生面团吸水量亦越高；添加胡芦巴胶后，生面团的稳定时间、断裂时间和机械耐力指数均有提高。按４∶１的面粉／高粱粉配方，添加０．６％胶可增大面包体积２１．８％，而０．９％的胶添加量能增大面包体积２１．３８％．

关键词：半乳甘露聚糖混粉面包质量胡芦巴胶

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Developmental dependence for functional eye regrowth in Xenopus laevis

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Neural Regeneration Research 2018年第10期13卷 1735-1737页

作者： Cindy X.kha.Kelly Ai-Sun Tseng School of Life Sciences University of Nevada

Introduction：A key challenge in designing tissue repair strategies is knowing whether and how developmental mechanisms are used for successful repair of mature/adult *** it is known that developmental components are used in repair,it remains mostly unclear which ones are required and whether they act similarly as during *** issue is further complicated by the fact that it is difficult.

关键词： Developmental dependence for functional eye regrowth in Xenopus laevis Figure RI

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变流器供电调整同步电动机端部设计

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国外大电机 1994年第1期 58-60页

作者： kha.,GKM 刘慧

在变流器供电同步电动机设计中，对于由谐频子电流引起的感应电流和抽耗需要进行特殊研究。本文叙述了用于计算端部静止构件中的基频和谐频损耗的设计方法，并阐明了不同的边界条件和磁导率在每种情况下需要解决的问题。在１５ＭＷ，２... 详细信息

在变流器供电同步电动机设计中，对于由谐频子电流引起的感应电流和抽耗需要进行特殊研究。本文叙述了用于计算端部静止构件中的基频和谐频损耗的设计方法，并阐明了不同的边界条件和磁导率在每种情况下需要解决的问题。在１５ＭＷ，２极，９８．３Ｈｚ，５９００ｒ／ｍｉｎ同步电动机的设计阶段中，使用这种方法作为一种设计手段。

关键词：同步电动机变流器设计

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