Provided is a speed controller
proportional valve median adjusting method based on hydraulic slave
system static balance. The method comprises: step 1, keeping given power of a
unit speed controller in a grid connected
power mode constant, or switching a speed controller to an electric manual state, to make a speed controller hydraulic slave
system in static balance; step 2, a speed controller
electrical control system acquiring main distribution position feedback M, main distribution position set Mset data; determining whether the main distribution position feedback M is equal to the main distribution position set Mset; if M<Mset, using the highest unit precision i of a
proportional valve median set value as step length, gradually increasing the
proportional valve median set value B0, returning to the step 2; if M>Mset, using i as the step length, gradually reducing the proportional valve median set value B0, returning to the step 2; if the main distribution position feedback M is equal to the main distribution position set Mset, the B0 value being a proportional valve actual median value B0actual, an adjusting process ending. The method can accurately determine the speed controller proportional valve median, and solves a problem of adjusting quality of a speed controller hydraulic slave system caused by inaccurate setting of the speed controller proportional valve median.