High voltage Static Synchronous Compensator (STATCOM) control and protection system, and switching method for active system and standby system of high voltage STATCOM control and protection system

The invention relates to a high voltage Static Synchronous Compensator (STATCOM) control and protection system, and a switching method for an active system and a standby system of the high voltage STATCOM control and protection system, wherein the switching method includes that the active system and the standby system perform interaction on automatic system check normal signals; when an automaticsystem check normal signal of the active system is invalid, and an automatic system check normal signal of the standby system is valid, switching of the active system and the standby system is performed. The high voltage STATCOM control and protection system of the invention includes two systems, namely the active system and the standby system. When detecting that its own state is abnormal and thestate of the standby system is normal, the active system switches to the standby system automatically, thus avoiding a high voltage STATCOM stopping running, and effectively improving reliability ofthe high voltage STATCOM co