一种改进自适应电导增量法在光伏系统的应用

摘要

PV system maximum power point tracking(MPPT)problem was studied. In order to solve the common adaptive conductance algorithm′s disadvantages such as complicated structure and slow dynamical response ,an improved adaptive conductance algorithm was proposed. The principle was searching the MPP by means of an adaptive correction of the DC/DC converter duty cycle which was determined by the sum of the incremental conductance and the instantaneous conductance. The proposed algorithm had a good behavior for MPPT during solar radiation transient periods. Comparing to common adaptive conductance algorithm,the proposed algorithm had better tracking efficiency, simpler construction and it could be implemented easily. The simulation and experimental results prove effectiveness of the proposed algorithm.%对光伏系统最大功率点跟踪(MPPT)问题进行研究,针对常规自适应电导增量法结构复杂、动态响应慢等缺点,提出一种改进自适应增量电导算法.其原理是通过检测瞬时电导和电导增量的和,自适应校正DC/DC变换器的占空比来追踪最大功率点(MPP).该算法在太阳辐射强度变化时,可以快速精确地进行最大功率点追踪.改进自适应电导增量法与常规自适应电导增量法相比,追踪效率更高,结构更简单,易于硬件实现.仿真和实验结果证明了算法的有效性.