Abstract: Disclosed are a soft start method, device, and system of a hybrid distribution transformer (HDT) based on unbypassing its voltage-compensating converter, which belong to the technical field of transformer control. According to the method, through a grid-side current controller, a DC-link voltage controller, a split-capacitor voltage balance controller, and a load voltage controller, a start process of the HDT is divided into an uncontrolled rectification stage and a PWM rectification stage. According to the present disclosure, an anti-parallel thyristor of the voltage-compensating converter is closed without a bypass in a process of energization. A DC-link capacitor is charged by respective converters of two transformers of the HDT simultaneously, and thus an energization flow is simpler. In addition, an inrush current at an initial phase of the PWM rectification stage can be effectively mitigated by improving an existing steady-state control strategy.

Abstract: Provided are a culture medium for preparing neural stem cell and use thereof, the culture medium for preparing neural stem cell comprising: a basic culture medium suitable for the growth of stem cell, and a cell signal pathway inhibitor selected from at least one of GSK inhibitor, MEK inhibitor, TGF-? inhibitor, ROCK inhibitor and BMP inhibitor.

Abstract: Provided are a culture medium for preparing neural stem cell and use thereof, the culture medium for preparing neural stem cell comprising: a basic culture medium suitable for the growth of stem cell, and a cell signal pathway inhibitor selected from at least one of GSK inhibitor, MEK inhibitor, TGF-? inhibitor, ROCK inhibitor and BMP inhibitor.