Photovoltaic inverter mppt: In the efficiency calculation of photovoltaic power generation system, photovoltaic conversion efficiency accounts for a large proportion, and if it is not solved well, the overall efficiency will decrease. The conversion efficiency depends on the operating point of the conversion system. Maximum power point tracking (MPPT) control can make the working point in the best position, improve the conversion efficiency and reduce the power generation cost, which is a mature technology at present. A good MPPT control should achieve five points: fast, efficient, independent, accurate and low price. The combination of MPPT and photovoltaic module structure transformation will develop towards more intelligent and logical control algorithm. The following goals need to be achieved: (1) The mathematical model is gradually optimized, and intelligent processing methods are widely used; (2) High responsiveness, universality, accuracy and cost performance; (3) The application in single-stage grid-connected system is realized.