The invention discloses a multi-level
voltage collaborative optimization method for a power distribution network and a related device. The method comprises the following steps: acquiring day-ahead prediction data, intra-day multi-period rolling prediction data and a multi-target cross-layer
voltage optimization model which takes
electric energy quality and economic operation into consideration and comprises a
transformer substation layer, a
feeder layer and an equivalent
transformer area layer; the day-ahead prediction data are input into a multi-target cross-layer
voltage optimization model, a first regulation and control instruction used for regulating a
transformer substation layer-
feeder layer-equivalent transformer area voltage layer is output, and the first regulation and control instruction comprises a switch
action control instruction and an active-
reactive power control instruction; reducing decision variables and constraint conditions of the multi-target cross-layer voltage optimization model in a
time domain by using the time scale of the intra-day multi-cycle rolling prediction data to obtain an intra-day multi-cycle rolling optimization model; the intra-day multi-cycle rolling optimization model is solved by adopting a distributed primitive dual
gradient method, a second regulation and control instruction used for adjusting a transformer substation layer-
feeder layer-equivalent transformer area voltage layer is obtained, and the second regulation and control instruction comprises an active power-
reactive power control instruction; and performing power distribution network multi-level voltage collaborative optimization according to the first regulation and control instruction and / or the second regulation and control instruction. The method aims at giving consideration to the
power quality and
economic benefits of the power distribution network, avoiding voltage out-of-limit, better utilizing various adjusting resources to achieve the highest efficiency, reducing the calculation amount by adopting a
distributed algorithm, and improving the calculation speed.