To achieve high-quality power supply in industrial distribution networks

multiple sets of equipment are required to simultaneously implement functions such as reactive power compensation and active power regulation

leading to increased equipment costs. To effectively reduce system costs

a multi-port power supply system based on the composite of cascaded static synchronous compensator (STATCOM) and power conversion system (PCS) is proposed

which combines the medium-voltage cascaded STATCOM with the low-voltage PCS to provide the cascaded STATCOM with certain active power regulation capability. On the AC side of the low-voltage PCS

a 380 V low-voltage AC bus is connected

which can reliably supply power to sensitive loads. When a fault disturbance occurs in the medium-voltage power grid

the cascaded STATCOM can effectively isolate the fault. Under extreme working conditions

when the medium-voltage power grid is disconnected from the low-voltage side

the 380 V low-voltage AC bus can also be maintained for short-term power supply by the low-voltage PCS. The research results show that the proposed scheme can simultaneously achieve reactive power compensation

active power regulation

and reliable power supply

which is beneficial for reducing system costs. Moreover

the system structure and working principle of the proposed new scheme are introduced

and a control strategy based on positive and negative sequence separation is proposed. Finally

the feasibility and effectiveness of the proposed scheme and control strategy are verified through simulation and experimental results.