单级式光伏并网逆变系统具有拓扑简单,成本较低的优点。但是这种系统中只存在一个能量变换环节,太阳能最大功率点跟踪(Maximum power point tracking,MPPT)、电网电压同步和输出电流正弦度等控制目标要求同时得到考虑,实现较为复杂。该...单级式光伏并网逆变系统具有拓扑简单,成本较低的优点。但是这种系统中只存在一个能量变换环节,太阳能最大功率点跟踪(Maximum power point tracking,MPPT)、电网电压同步和输出电流正弦度等控制目标要求同时得到考虑,实现较为复杂。该文提出了一种改进的MPPT算法,在实现上述功能的同时,显著提高了单级式光伏并网逆变系统在光照强度快速变化时的稳定性。该算法的改进主要在于稳态情况下,调整光伏阵列工作点时根据增减方向分别选取合适的步长值;动态情况下,采用前馈方法检测光照强度突变过程,从而迅速改变并网系统运行状态以避免母线电压崩溃现象。基于PSIM仿真平台,对比了定步长MPPT算法和新算法,在阐述算法改进的基础上给出了仿真结果。实验室还建立了300Wp的单级式光伏并网逆变系统,应用全数字化DSP控制技术和改进MPPT算法,实现了系统的并网和可靠运行。仿真和实验结果表明,应用改进MPPT算法的单级式光伏并网逆变系统能够准确跟踪太阳能电池最大功率点,并具有较好的稳定性。展开更多
Due to the challenge of climate and energy crisis,renewable energy generation including solar generation has experienced significant growth.Increasingly high penetration level of photovoltaic(PV)generation arises in s...Due to the challenge of climate and energy crisis,renewable energy generation including solar generation has experienced significant growth.Increasingly high penetration level of photovoltaic(PV)generation arises in smart grid.Solar power is intermittent and variable,as the solar source at the ground level is highly dependent on cloud cover variability,atmospheric aerosol levels,and other atmosphere parameters.The inherent variability of large-scale solar generation introduces significant challenges to smart grid energy management.Accurate forecasting of solar power/irradiance is critical to secure economic operation of the smart grid.This paper provides a comprehensive review of the theoretical forecasting methodologies for both solar resource and PV power.Applications of solar forecasting in energy management of smart grid are also investigated in detail.展开更多
文摘单级式光伏并网逆变系统具有拓扑简单,成本较低的优点。但是这种系统中只存在一个能量变换环节,太阳能最大功率点跟踪(Maximum power point tracking,MPPT)、电网电压同步和输出电流正弦度等控制目标要求同时得到考虑,实现较为复杂。该文提出了一种改进的MPPT算法,在实现上述功能的同时,显著提高了单级式光伏并网逆变系统在光照强度快速变化时的稳定性。该算法的改进主要在于稳态情况下,调整光伏阵列工作点时根据增减方向分别选取合适的步长值;动态情况下,采用前馈方法检测光照强度突变过程,从而迅速改变并网系统运行状态以避免母线电压崩溃现象。基于PSIM仿真平台,对比了定步长MPPT算法和新算法,在阐述算法改进的基础上给出了仿真结果。实验室还建立了300Wp的单级式光伏并网逆变系统,应用全数字化DSP控制技术和改进MPPT算法,实现了系统的并网和可靠运行。仿真和实验结果表明,应用改进MPPT算法的单级式光伏并网逆变系统能够准确跟踪太阳能电池最大功率点,并具有较好的稳定性。
基金This work was partially sup-ported by National High-tech R&D Program of China(863 Program,grant no.2014AA051901)Nature Science Foundation of China grant no.2014DFG62670,51207077 and 51261130472+1 种基金China Postdoctoral Science Foundation grant no.2015M580097Hong Kong RGC Theme Based Research Scheme grant no.T23-407/13-N.
文摘Due to the challenge of climate and energy crisis,renewable energy generation including solar generation has experienced significant growth.Increasingly high penetration level of photovoltaic(PV)generation arises in smart grid.Solar power is intermittent and variable,as the solar source at the ground level is highly dependent on cloud cover variability,atmospheric aerosol levels,and other atmosphere parameters.The inherent variability of large-scale solar generation introduces significant challenges to smart grid energy management.Accurate forecasting of solar power/irradiance is critical to secure economic operation of the smart grid.This paper provides a comprehensive review of the theoretical forecasting methodologies for both solar resource and PV power.Applications of solar forecasting in energy management of smart grid are also investigated in detail.
