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 ...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.展开更多
The performance of photovoltaic(PV)systems is in-fluenced by various factors,including atmospheric conditions,geographical locations,and spatial and temporal characteristics.Consequently,the optimization of PV systems...The performance of photovoltaic(PV)systems is in-fluenced by various factors,including atmospheric conditions,geographical locations,and spatial and temporal characteristics.Consequently,the optimization of PV systems relies heavily on the global maximum power point tracking(GMPPT)methods.In this paper,we adopt virtual reality(VR)technology to visual-ize PV entities and simulate their performances.The integra-tion of VR technology introduces a novel spatial and temporal dimension to the shading pattern recognition(SPR)of PV sys-tems,thereby enhancing their descriptive capabilities.Further-more,we introduce an interactive GMPPT(IGMPPT)method based on VR technology.This method leverages interactive search techniques to narrow down search regions,thereby en-hancing the search efficiency.Experimental results demonstrate the effectiveness of the proposed IGMPPT in representing the spatial and temporal characteristics of PV systems and improv-ing the efficiency of GMPPT.展开更多
Artificial intelligence,machine learning and deep learning algorithms have been widely used for Maximum Power Point Tracking(MPPT)in solar systems.In the traditional MPPT strategies,following of worldwide Global Maxim...Artificial intelligence,machine learning and deep learning algorithms have been widely used for Maximum Power Point Tracking(MPPT)in solar systems.In the traditional MPPT strategies,following of worldwide Global Maximum Power Point(GMPP)under incomplete concealing conditions stay overwhelming assignment and tracks different nearby greatest power focuses under halfway concealing conditions.The advent of artificial intelligence in MPPT has guaranteed of accurate following of GMPP while expanding the significant performance and efficiency of MPPT under Partial Shading Conditions(PSC).Still the selection of an efficient learning based MPPT is complex because each model has its advantages and drawbacks.Recently,Meta-heuristic algorithm based Learning techniques have provided better tracking efficiency but still exhibit dull performances under PSC.This work represents an excellent optimization based on Spotted Hyena Enabled Reliable BAT(SHERB)learning models,SHERB-MPPT integrated with powerful extreme learning machines to identify the GMPP with fast convergence,low steady-state oscillations,and good tracking efficiency.Extensive testing using MATLAB-SIMULINK,with 50000 data combinations gathered under partial shade and normal settings.As a result of simulations,the proposed approach offers 99.7%tracking efficiency with a slower convergence speed.To demonstrate the predominance of the proposed system,we have compared the performance of the system with other hybrid MPPT learning models.Results proved that the proposed cross breed MPPT model had beaten different techniques in recognizing GMPP viably under fractional concealing conditions.展开更多
In order to further improve the tracking accuracy,speed,and disturbance robustness of the global maximum power point tracking(GMPPT)control of a photovoltaic array under partial-shade conditions,a photovoltaic GMPPT c...In order to further improve the tracking accuracy,speed,and disturbance robustness of the global maximum power point tracking(GMPPT)control of a photovoltaic array under partial-shade conditions,a photovoltaic GMPPT control method based on the improved dung beetle optimization(IDBO)algorithm is proposed.First,in order to improve the algorithm performance,a Chebyshev chaotic map is used to initialize the positions of the dung beetles to make the distribution of the dung beetle population in the search space more uniform,which increased the population convergence rate and final solution accuracy of the algorithm.Second,a neighborhood search mechanism combined with a Levy flight strategy is introduced to enhance the local search precision and convergence speed of the algorithm,and improve the accuracy of the global maximum power point(GMPP)location.At the same time,a dynamic weight is introduced to improve the convergence rate of the algorithm in the later search stage,along with the global-search ability of the equalization algorithm.Finally,a restart mechanism is used to enhance the robustness of the GMPPT control through the influence of mutation factors in a complex environment.The experimental results show that compared with DBO,grey wolf optimization(GWO),sparrow search algorithm(SSA)and particle swarm optimization(PSO)algorithms,the IDBO based solar maximum power point tracking control method is more accurate in determining the GMPP position,and has better dynamic response speed and tracking accuracy.展开更多
文摘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.
基金This research was supported by the Suzhou Science and Technology Project-Key Industrial Technology Innovation(No.SYG202122)the XJTLU Postgraduate Research Scholarship(No.PGRS1906004)+1 种基金the XJTLU AI University Research CentreJiangsu(Provincial)Data Science and Cognitive Computational Engineering Research Centre.
文摘The performance of photovoltaic(PV)systems is in-fluenced by various factors,including atmospheric conditions,geographical locations,and spatial and temporal characteristics.Consequently,the optimization of PV systems relies heavily on the global maximum power point tracking(GMPPT)methods.In this paper,we adopt virtual reality(VR)technology to visual-ize PV entities and simulate their performances.The integra-tion of VR technology introduces a novel spatial and temporal dimension to the shading pattern recognition(SPR)of PV sys-tems,thereby enhancing their descriptive capabilities.Further-more,we introduce an interactive GMPPT(IGMPPT)method based on VR technology.This method leverages interactive search techniques to narrow down search regions,thereby en-hancing the search efficiency.Experimental results demonstrate the effectiveness of the proposed IGMPPT in representing the spatial and temporal characteristics of PV systems and improv-ing the efficiency of GMPPT.
文摘Artificial intelligence,machine learning and deep learning algorithms have been widely used for Maximum Power Point Tracking(MPPT)in solar systems.In the traditional MPPT strategies,following of worldwide Global Maximum Power Point(GMPP)under incomplete concealing conditions stay overwhelming assignment and tracks different nearby greatest power focuses under halfway concealing conditions.The advent of artificial intelligence in MPPT has guaranteed of accurate following of GMPP while expanding the significant performance and efficiency of MPPT under Partial Shading Conditions(PSC).Still the selection of an efficient learning based MPPT is complex because each model has its advantages and drawbacks.Recently,Meta-heuristic algorithm based Learning techniques have provided better tracking efficiency but still exhibit dull performances under PSC.This work represents an excellent optimization based on Spotted Hyena Enabled Reliable BAT(SHERB)learning models,SHERB-MPPT integrated with powerful extreme learning machines to identify the GMPP with fast convergence,low steady-state oscillations,and good tracking efficiency.Extensive testing using MATLAB-SIMULINK,with 50000 data combinations gathered under partial shade and normal settings.As a result of simulations,the proposed approach offers 99.7%tracking efficiency with a slower convergence speed.To demonstrate the predominance of the proposed system,we have compared the performance of the system with other hybrid MPPT learning models.Results proved that the proposed cross breed MPPT model had beaten different techniques in recognizing GMPP viably under fractional concealing conditions.
基金Supported by the National Natural Science Foundation of China(61903291)Key R&D Project in Shaanxi Province(2022GY-134)Open Fund Project of New Energy Joint Laboratory of China Southern Power Grid Corporation in 2022(GDXNY2022KF01).
文摘In order to further improve the tracking accuracy,speed,and disturbance robustness of the global maximum power point tracking(GMPPT)control of a photovoltaic array under partial-shade conditions,a photovoltaic GMPPT control method based on the improved dung beetle optimization(IDBO)algorithm is proposed.First,in order to improve the algorithm performance,a Chebyshev chaotic map is used to initialize the positions of the dung beetles to make the distribution of the dung beetle population in the search space more uniform,which increased the population convergence rate and final solution accuracy of the algorithm.Second,a neighborhood search mechanism combined with a Levy flight strategy is introduced to enhance the local search precision and convergence speed of the algorithm,and improve the accuracy of the global maximum power point(GMPP)location.At the same time,a dynamic weight is introduced to improve the convergence rate of the algorithm in the later search stage,along with the global-search ability of the equalization algorithm.Finally,a restart mechanism is used to enhance the robustness of the GMPPT control through the influence of mutation factors in a complex environment.The experimental results show that compared with DBO,grey wolf optimization(GWO),sparrow search algorithm(SSA)and particle swarm optimization(PSO)algorithms,the IDBO based solar maximum power point tracking control method is more accurate in determining the GMPP position,and has better dynamic response speed and tracking accuracy.
