基于一种最大功率点跟踪算法的应用研究

Application Research Based on a Maximum Power Point Tracking Algorithm

针对光伏阵列最大功率点跟踪(MPPT)常用的扰动观察法存在的扰动问题,提出了一种改进型扰动观察法,建立基于Boost电路的MPPT电路模型,通过仿真实验对该算法进行验证;采用Matlab/Simulink模块建立并网逆变器系统模型,在前级Boost电路采用改进型扰动观察法实现MPPT,后级逆变电路双闭环控制进行系统应用仿真。仿真结果表明,改进型扰动观察法能快速实现MPPT,提升系统动、稳态性能,且能够快速适应温度和光照强度的变化,有效提升系统效率;逆变器输出电流波形接近正弦波,并能准确地与电网电压保持同频同相,验证了该算法的可行性。

In order to solve the disturbance problem of the traditional perturbation and observation method for maximum power point tracking(MPPT)algorithm in PV system,a modified disturbance observation method is adopted in this paper.The MPPT is realized by the modified algorithm in the first stage boost circuit,and double closed-loop control strategy is adopted in the back stage grid connected inverter,and the simulation model is established under the Matlab/Simulink.The simulation results show that the modified method can not only achieve MPPT quickly,but also improve the dynamic and steady performance.It is also shown that the modified method has the advantages of high efficiency and fast response to changes of temperature and light intensity.The output current waveform of the inverter is close to the sine wave,and can maintain the same frequency and phase with the grid voltage accurately,which verifies the feasibility of the algorithm.