一种可应用于小型光伏的MPPT技术

A novel MPPT technique for small scaled PV system

提出了一种基于FOCV方法应用在小型光伏系统中的新型太阳能电池MPPT技术。首先,将太阳能电池阵列改变为全串联、全并联或串并混联的组合方式,相同的环境下,这些阵列在理论上拥有相同的最大输出功率,但需要不同的负载与阻抗相匹配;其次,许多拥有不同阻值的负载电阻可以被选择连接到太阳能电池阵列中,使太阳能电池的输出功率最大化;最后,使用MCU测量每种模式的电压并使用FOCV方法来确定最大的功率状态。

Maximal power point tracking （MPPT） is a technique that maximum the output power of solar cells array which depends on the ambient temperature and irradiance. Fractional Open-Circuit Voltage （FOCV）is an MPPT technique that widely adopted in small photovoltaic system. This paper proposes a novel solar cell MPPT technique which based on FOCV method in small scale system. For one thing, it changes the solar cell array as series, parallel or series-parallel mixed array. Under the same environment, these arrays have the same maximum output power theoretically but requiring different load to match the impedance. For another thing, there are many load resistors with different resistances could be choice to connect to the solar cell array in order to choose a load to maximize the output power; At last, the MCU measures the voltage of each mode and using the FOCV method to determine the maximum power status.