The present invention relates to a power conversion system, comprising: a high voltage "HV" switchgear (3); a solid-state transformer (4); and a low voltage "LV" switchgear (5). The HV switchgear (3) is configured to connect to a high voltage "HV" network (2) and disconnect from the HV network (2). The HV switchgear (3) is configured to connect to an input of the solid-state transformer (4). The solid-state transformer (4) comprises a first module (11) and a second module (12) connected to the first module. The first module (11) is configured to convert a high voltage alternating current "HV AC" signal into a high voltage direct current "HV DC" signal, and the first module (11) is configured to convert a HV DC signal into a HV AC signal. The second module (12) is configured to convert a HV DC signal into at least one low voltage direct current "LV DC" signal, and the second module (12) is configured to convert at least one LV DC signal into a HV DC signal. The LV switchgear (5) is configured to connect to an output of the solid-state transformer (4). The LV switchgear (5) is configured to connect to a plurality of applications or devices (6) and configured to disconnect from the plurality of applications or devices (6). The system is configured to transfer power from the HV network to the plurality of applications or devices. The system is configured to transfer power from the plurality of applications or devices to the HV network.