光伏发电系统最大功率点跟踪的研究与设计

Research and Design of Maximum Power Point Tracking of Photovoltaic System

在光伏发电系统中,采用何种前级升压电路以及光伏电池的最大功率点跟踪方法始终是究热点。针对传统Boost电路输入电流纹波大、功率因数低等问题,提出采用交错并联Boost电路作为前级电路,并对其进行研究;针对传统跟踪方法时间长、效率低等问题,改进变步长电导增量法,能够兼顾动态速度和稳态精度进而实现最大功率点跟踪。搭建仿真模型,结果验证了交错并联Boost电路可有效减小输入电流纹波,而改进变步长电导增量法跟踪速度更快,稳定性更好。搭建实验平台,结果验证了两者相结合实现最大功率点跟踪的可行性。

Adopting the suitable pre-stage boost circuit and the maximum power point tracking technology are always research hotspots in photovoltaic systems.To address the input current ripple and low power factor of traditional boost chopper,interleaved boost chopper was adopted as the pre-stage circuit and researched.And a variable step size incremental conductance algorithm was improved to solve the problem of traditional methods,which combines the dynamic speed and steady state precision to realize the maximum power point tracking technology.The simulation model was built and the results show that the interleaved boost circuit can effectively reduce input current ripple,and the improved incremental conductance method with variable step size has faster tracking speed and better stability.The experimental platform was built and the results verified the feasibility of the combination to achieve maximum power point tracking.