Fault handling system of solid-state transformer

A fault handling system of a solid-state transformer, comprising a first power unit and a second power unit that are cascaded and connected, wherein:

• the first power unit comprises a first busbar capacitor, a first auxiliary supply, a first control module, and a first communication module, wherein the first communication module is electrically connected to the first control module, the first auxiliary supply and the first control module are both electrically connected to two ends of the first busbar capacitor, the first control module is electrically connected to the first auxiliary supply, and the first control module is configured to detect a voltage of the first busbar capacitor;
• the second power unit comprises a second busbar capacitor, a second auxiliary supply, and a second control module, wherein the second control module is electrically connected to the first communication module, the second auxiliary supply and the second control module are both electrically connected to two ends of the second busbar capacitor, the second busbar capacitor is connected in series to the first busbar capacitor, the second control module is electrically connected to the second auxiliary supply, and the second control module is configured to detect a voltage of the second busbar capacitor;
• and
• the first communication module is configured to output fault information to the second control module in response to the first control module detecting that the voltage of the first busbar capacitor is greater than or equal to a first threshold and the second control module is configured to close the second auxiliary supply in response to receiving the fault information.