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提出一种光伏直驱式热水系统,并建立系统的流量模型,研究和比较3种不同的连接方式(直接连接,光伏分组连接,通过最佳功率输出控制器(MPPT)连接)下系统的流量特性。搭建实验系统,实验验证模型的准确性。结果显示:在相同的启动辐照下,随着辐照度的增大,使用直接连接方式时,系统流量先增大后基本恒定;使用光伏分组连接的方式时,系统流量先基本恒定后逐渐变大;使用有MPPT的连接时,系统流量基本呈线性升高。此外,直接连接方式所需的太阳电池最多,采用有MPPT的连接方式所需的太阳电池最少且其太阳电池的输出效率也最高。但光伏分组连接方式最具经济性。考虑到经济性和稳定性,光伏分组连接方式应为此类热水系统的首选连接方式。该研究可对光伏直驱式热水系统中光伏与泵的连接方式的设计提供参考和依据。
A photovoltaic direct-drive hot water system was proposed and a system flow model was established to study and compare three different connection modes (direct connection, PV group connection, connection through the MPPT) Flow characteristics. Set up an experimental system to experimentally verify the accuracy of the model. The results show that under the same starting radiation, with the increase of irradiance, when the direct connection mode is used, the system flow firstly increases and then is basically constant. When using PV group connection mode, the system flow rate is basically constant and then gradually Become bigger; When using the MPPT connection, the system traffic increases linearly. In addition, direct connections require the most solar cells, using the MPPT connection requires the least number of solar cells and their solar cells have the highest output efficiency. However, the most economical way to connect PV cells. Taking economy and stability into account, PV group connections should be the preferred connection for such hot water systems. The research can provide reference and basis for the design of photovoltaic and pump connection in PV direct drive hot water system.