Saisi × China Three Gorges Corporation | Saisi Provides Time Synchronization System for CTG Power

China Three Gorges Corporation (CTG) and its controlled subsidiary China Yangtze Power Co., Ltd. (CYPC) — the world’s largest listed hydropower company, which owns and operates hydropower stations including the Three Gorges, Gezhouba, Xiluodu, and Xiangjiaba, and undertakes investment and operation of pumped storage projects and supporting new energy projects — have actively responded to the extreme summer heat, steadily ensured energy supply and energy transition, and fully safeguarded national energy security.

To better ensure giant generating units operate at optimal conditions and achieve full and stable power output, CTG and CYPC have partnered with Saisi to build a cascade dispatching communication & automation time synchronization system.

By upgrading the communication clock system across the CYPC river basin and constructing the clock system for the cascade dispatching automation system, Saisi enables hydropower stations in the CTG basin to receive dual Beidou signals, realizing full coverage of Beidou timing. This precisely supports the efficient operation of giant generating units, promotes excellent performance of new units, and helps veteran units achieve renewed vitality.

Time Synchronization System: Basic / Master-Slave / 1+1 Redundant Mode

I. Upgrading of Communication Clock System in CYPC River Basin

Saisi will replace existing legacy equipment with cesium atomic clocks and BITS devices at multiple CTG sites.

PRC primary reference clocks (cesium clock + dual antennas + BITS) will be deployed at Xiba Control Building and Chengdu CTG Building.

Clock synchronization equipment (dual antennas + BITS) will be installed at Three Gorges Operation Center, Beijing Building, Xiangjiaba Right Bank, and Xiluodu Right Bank.

Saisi will replace supporting communication clock equipment at Kunming CTG Building, Wudongde Construction & Management Center, Baihetan Control Building, etc., to enable signal reception.

Network management terminals will be set up at four sites: Xiba Control Building, Chengdu CTG Building, Kunming CTG Building, and Beijing Yuyuantan Office Building, responsible for monitoring and managing all site clock devices and cesium clocks.

II. Construction of Cascade Dispatching Automation Clock System

The clean energy corridor has formed a new pattern of “six-reservoir joint dispatching”, where one drop of water generates power six times, maximizing water resource utilization in the Yangtze River Basin.

To implement the concept of lean operation, Saisi will add 2 sets of master clocks and 2 sets of space-time security isolation devices in Yichang, Chengdu, and Kunming for CTG and CYPC.Together with existing clock equipment, they will provide timing by security zones, building a complete cascade dispatching automation clock system with full Beidou timing coverage.

This provides high-precision time synchronization support for:

Daily analysis, weekly diagnosis, and monthly evaluation of equipment monitoring, unit annual maintenance, and other basic management

Formation of “physical examination reports” and “equipment resumes” for megawatt-class generating units