光伏电池的输出功率具有非线性特性,易受外界温度、光强等条件影响。光伏发电系统多采用最大功率点跟踪(maximum power point tracking,MPPT)技术来检测光伏发电状态与故障自诊断,从而保证输出功率。本文首先分析了外界环境因素变化对...光伏电池的输出功率具有非线性特性,易受外界温度、光强等条件影响。光伏发电系统多采用最大功率点跟踪(maximum power point tracking,MPPT)技术来检测光伏发电状态与故障自诊断,从而保证输出功率。本文首先分析了外界环境因素变化对光伏发电系统的输出功率的影响;其次利用Matlab/Simulink搭建了包含升压(BOOST)电路和PWM控制模块的光伏发电系统仿真模型,并研究了电流型扰动观察法的MPPT的实现算法。仿真结果表明,在温度发生改变时,MPPT能够及时调节,实现最大功率点的跟踪,实现分布式光伏状态监测与故障自诊断,验证了仿真模型的正确性及MPPT策略的可靠性,该方法是比电导增量法具有更短寻优时间和更高精度的MPPT策略。展开更多
This work presents a novel coordinated control strategy of a hybrid photovoltaic/battery energy storage(PV/BES) system. Different controller operation modes are simulated considering normal, high fluctuation and emerg...This work presents a novel coordinated control strategy of a hybrid photovoltaic/battery energy storage(PV/BES) system. Different controller operation modes are simulated considering normal, high fluctuation and emergency conditions. When the system is grid-connected, BES regulates the fluctuated power output which ensures smooth net injected power from the PV/BES system. In islanded operation, BES system is transferred to single master operation during which the frequency and voltage of the islanded microgrid are regulated at the desired level. PSCAD/EMTDC simulation validates the proposed method and obtained favorable results on power set-point tracking strategies with very small deviations of net output power compared to the power set-point. The state-of-charge regulation scheme also very effective with SOC has been regulated between 32% and 79% range.展开更多
The overall problem with PV （photovoltaic） systems is the high cost for the photovoltaic modules. This makes it interesting to concentrate irradiation on the PV-module, thereby reducing the PV area necessary for obt...The overall problem with PV （photovoltaic） systems is the high cost for the photovoltaic modules. This makes it interesting to concentrate irradiation on the PV-module, thereby reducing the PV area necessary for obtaining the same amount of output power. The tracking capability of two-axes tracking unit driving a new concentrating paraboloid for electric and heat production have been evaluated. The reflecting optics consisting of flat mirrors provides uniform illumination on the absorber which is a good indication for optimised electrical production due to series connection of solar cells. The calculated optical efficiency of the system indicates that about 80% of the incident beam radiation is transferred to the absorber. Simulations of generated electrical and thermal energy from the evaluated photovoltaic thermal （PV/T） collector show the potential of obtaining high total energy efficiency.展开更多
Recently, thick haze and poisonous smoke have cloaked the surrounding air in Malaysia due to the uncontrollable and unethical burning of nearby country. This devastating episode of open burning started in the year 199...Recently, thick haze and poisonous smoke have cloaked the surrounding air in Malaysia due to the uncontrollable and unethical burning of nearby country. This devastating episode of open burning started in the year 1997 in Indonesia which deeply affected most of the ASEAN （association of southeast asian nations） countries especially their neighbour Malaysia and Singapore. The PV （photovoltaic） technology as an alternative means of energy generation experiences such significant energy decrease based on this condition which is due to the shading of sunlight. The 6 h claims of good sunlight has become not more than 2 h and gets worst when the API （air pollution index） struck 200 levels which is at very unhealthy condition. This study embraces some findings from 1 kWp PV generator field data installed in Malaysia reflecting the daily energy decrease operated during this unhealthy weather condition. It is found that, such significant energy decrease with the value of 0.43 W power output per increment of one point API. This value shows such concrete proof of additional factors to be considered in PV modelling in line to support PV technology adaptation in the ASEAN region.展开更多
文摘光伏电池的输出功率具有非线性特性,易受外界温度、光强等条件影响。光伏发电系统多采用最大功率点跟踪(maximum power point tracking,MPPT)技术来检测光伏发电状态与故障自诊断,从而保证输出功率。本文首先分析了外界环境因素变化对光伏发电系统的输出功率的影响;其次利用Matlab/Simulink搭建了包含升压(BOOST)电路和PWM控制模块的光伏发电系统仿真模型,并研究了电流型扰动观察法的MPPT的实现算法。仿真结果表明,在温度发生改变时,MPPT能够及时调节,实现最大功率点的跟踪,实现分布式光伏状态监测与故障自诊断,验证了仿真模型的正确性及MPPT策略的可靠性,该方法是比电导增量法具有更短寻优时间和更高精度的MPPT策略。
文摘This work presents a novel coordinated control strategy of a hybrid photovoltaic/battery energy storage(PV/BES) system. Different controller operation modes are simulated considering normal, high fluctuation and emergency conditions. When the system is grid-connected, BES regulates the fluctuated power output which ensures smooth net injected power from the PV/BES system. In islanded operation, BES system is transferred to single master operation during which the frequency and voltage of the islanded microgrid are regulated at the desired level. PSCAD/EMTDC simulation validates the proposed method and obtained favorable results on power set-point tracking strategies with very small deviations of net output power compared to the power set-point. The state-of-charge regulation scheme also very effective with SOC has been regulated between 32% and 79% range.
文摘The overall problem with PV （photovoltaic） systems is the high cost for the photovoltaic modules. This makes it interesting to concentrate irradiation on the PV-module, thereby reducing the PV area necessary for obtaining the same amount of output power. The tracking capability of two-axes tracking unit driving a new concentrating paraboloid for electric and heat production have been evaluated. The reflecting optics consisting of flat mirrors provides uniform illumination on the absorber which is a good indication for optimised electrical production due to series connection of solar cells. The calculated optical efficiency of the system indicates that about 80% of the incident beam radiation is transferred to the absorber. Simulations of generated electrical and thermal energy from the evaluated photovoltaic thermal （PV/T） collector show the potential of obtaining high total energy efficiency.
文摘Recently, thick haze and poisonous smoke have cloaked the surrounding air in Malaysia due to the uncontrollable and unethical burning of nearby country. This devastating episode of open burning started in the year 1997 in Indonesia which deeply affected most of the ASEAN （association of southeast asian nations） countries especially their neighbour Malaysia and Singapore. The PV （photovoltaic） technology as an alternative means of energy generation experiences such significant energy decrease based on this condition which is due to the shading of sunlight. The 6 h claims of good sunlight has become not more than 2 h and gets worst when the API （air pollution index） struck 200 levels which is at very unhealthy condition. This study embraces some findings from 1 kWp PV generator field data installed in Malaysia reflecting the daily energy decrease operated during this unhealthy weather condition. It is found that, such significant energy decrease with the value of 0.43 W power output per increment of one point API. This value shows such concrete proof of additional factors to be considered in PV modelling in line to support PV technology adaptation in the ASEAN region.
