The UHV DC system greatly improves the large-scale resource allocation capability of the power grid, and makes the scheduling operation and safety control characteristics of the power grid become more complex. In case of emergency blocking of the large capacity DC transmission system, the sending-end AC system will generate power surplus, while the receiving-end system will generate power vacancy, causing a great impact on the system power flow, frequency and busbar voltage.
By virtue of the traditional advantages on stability control, SIFANG carries out in-depth analysis of the requirements for power grid stable operation, and develops the sending-end grid high frequency centralized control system and receiving-end grid precision load shedding system in due time. These systems have been implemented successfully in many areas, effectively maintaining the safe and stable operation of power grid.