Aiming at the problem that the maximum power point of solar cells was affected by varying radiation and environment temperature, a maximum power point tracking method based on neural network back stepping control technology was proposed. At first, a neural network was used to obtain the optimal DC bus reference voltage, an adaptive back stepping control was designed to track the maximum power point of PV power system and fulfill the demand of the unity power factor control. Then the neural network was used to compensate uncertain part of PV pow...