基于双输入Boost变换器的拓扑分析和光伏MPPT控制研究

Topology Analysis and Photovoltaic Maximum Power Point Tracking Control Research Based on Dual Input Boost Converter

研究了一种基于太阳能光伏电池的双输入Boost变换器。首先介绍了常见的双输入Boost变换器拓扑结构,详细分析了双输入Boost变换器工作在电感电流连续导电模式(Continuous Conduction Mode,CCM)和断续导电模式(Discontinuous Conduction Mode,DCM)时的工作原理和工作过程。由于太阳能光伏电池具有供电不稳定的特点,根据太阳能光伏电池输出功率与负载功率的关系,在稳定输出电压和功率的基础上实现对新能源的优先利用。根据太阳能光伏模块P-V特性的非线性,采用扰动观察法实现对光伏模块的最大功率点跟踪(Maximum Power Point Tracking,MPPT)。基于PSIM仿真平台,搭建基于MPPT控制算法的双输入Boost变换器的仿真电路,并对仿真结果进行了分析。研究结果表明,所搭建的MPPT算法模型实现了最大功率点的跟踪。

A dual input Boost converter based on solar photovoltaic cells has been investigated.Firstly,the common topology of dual input Boost converters is introduced,and the working principle and process of dual input Boost converters operating in continuous conduction mode(CCM)and discontinuous conduction mode(DCM)are analyzed in detail.Due to the unstable power supply characteristics of solar photovoltaic cells,based on the relationship between output power and load power of solar photovoltaic cells,the priority utilization of new energy is achieved on the basis of stable output voltage and power.Based on the nonlinear P-V characteristics of solar photovoltaic modules,the disturbance observation method is adopted to achieve the Maximum Power Point Tracking(MPPT)of the photovoltaic module.Based on the PSIM simulation platform,a simulation circuit for a dual input Boost converter using the MPPT control algorithm was constructed,and the simulation results were analyzed.The research results indicate that the constructed MPPT algorithm model achieves the maximum power point tracking.