电网技术2011，Vol.35Issue(7)：60-65,6.
光照强度快速变化时光伏系统稳定性分析
Stability Analysis of Photovoltaic Generation System Under Rapid Change of Light Intensity
摘要
Abstract
Since the output power of photovoltaic (PV) cell depends on light intensity, under the weather conditions, such as cloudy weather and windy weather, that make temporary obvious change of light intensity the maximin power point (MPP) of PV array will temporarily move correspondingly, so common maximum power point tracking (MPPT) algorithm will temporarily lose efficacy because conventional MPPT algorithm cannot distinguish that the change of PV array's power output is caused by its own disturbance or by the change of external light intensity. The reasons causing the instability of both mathematical model of PV array characteristics and conventional maximum power tracking method under rapid change of light intensity are analyzed, then an MPPT method,in which an extra measurement is inserted between two adjacent samplings, is proposed to eliminate the influence of rapid change of light intensity on PV generation system. Results of theoretical anlaysis and simulation show that utilizing the proposed MPPT method that can eliminate the influence of light intensity change can effectively avoid the misjudgement of controller and accurately the power increment of PV array caused by disturbance of MTTP, thus the moving away of operation point of PV array from MPP can be avoided and the stability and reliability of PV generation system can be improved.关键词
光强变化/光伏阵列/最大功率跟踪/稳定性Key words
change of light intensity/ PV army/ maximum power point tracking (MPPT)/ stability分类
信息技术与安全科学引用本文复制引用
廖志帆,祁新梅,郑寿森,王飞..光照强度快速变化时光伏系统稳定性分析[J].电网技术,2011,35(7):60-65,6.基金项目
广东省自然科学基金项目(8451027501001493). （8451027501001493）
