【摘要】 在温室中引入可再生能源,能够极大地促进温室的节能减排。针对温室室顶安装的太阳能电池板,可能出现的局部遮阴或光强分布不均而造成的光伏阵列失配及热斑现象等问题,采取了一种新型的两阶段光伏最大功率点跟踪(MPPT)控制方法。该方法将光伏系统产生的阻抗偏差以及偏差的变化率作为模糊控制的输入,输出量为下一时刻的占空比调整步长,从而控制负载大小,实现最大功率点的跟踪控制。此外,基于系统初次寻优时间、环境改变后的二次寻优时间,以及功率的振幅为MPPT的性能指标,在仿真环境和试验平台下对提出的控制方法进行分析对比,结果表明:所提出的模糊优化等效阻抗匹配法具有较快的寻优速度和较高的稳态精度。更多还原

【Abstract】 The introduction of renewable energy in the greenhouse,can greatly promote the energy conservation and emissions reduction.In view of the solar panels on the greenhouse roof,the possibility of partial shade or light intensity distribution of photovoltaic array mismatch and hot spot phenomenon,put forward a new two-phase maximum power point tracking(MPPT) control method.At first,using the equivalent impedance matching method(EIM) find out the equivalent impedance deviation and its change rate of the system,then as the two inputs of fuzzy control for fuzzy optimization,get the duty cycle adjustment step length of the system in the next moment,so as to realize the p-v arrays maximum power point tracking control.In addition,put the first optimization time and the second optimization time in the changing environment condition and power amplitude as the performance indicators of MPPT,to analysis and compare the proposed method in the simulation environment and experimental platform,the results show that the method has faster optimization speed and higher steady-state accuracy.更多还原