Maximum Power Point Tracking Control Method for Photovoltaic Generator Units in Extremely Cold Regions
The environment in extremely cold regions is complex,and the tracking results of photovoltaic power points are not accurate due to light intensity fluctuation and low temperature.To address this issue,a power correction algorithm-based maximum power point tracking control method for photovoltaic generator units in extremely cold regions was pro-posed.First an equivalent circuit model for photovoltaic cells in extremely cold regions was established to analyze the cur-rent voltage characteristics of the cells.Then the outputs of photovoltaic cells under the conditions of constant light inten-sity with varying temperatures,and constant temperature with varying light intensities were analyzed,which indicated a deviation in the output power.Finally the proposed control method was used to correct the output power of the photovolta-ic generator unit under actual working conditions,in which the real-time maximum available power and real-time output power were calculated to ensure consistently maintained operation of the unit at maximum power point and achieve effec-tive regulation of the output power.According to the experimental results,during the tracking and control process by the proposed method,the unit achieved maximum powers of 240 W,190 W,160 W,120 W,under light intensities of 1000 W/m2,750 W/m2,500 W/m2,250 W/m2,respectively,and maximum powers of 260 W,240 W,200 W,and 165 W,under temperatures of-45 ℃,-40 ℃,-35 ℃,and-30 ℃,respectively.These results were in consistency with the actual data,indicating the accuracy of the proposed tracking and control method.
extremely cold regionphotovoltaic generator unitmaximum power pointtracking control
万方数据
维普
