On October 15, 2020, the stability control system of the Ali power networking project undertaken by NR was put into operation smoothly. The Ali networking project has realized the interconnection of the Ali power grid and the central Tibet power grid, fundamentally solving the serious power shortage problem in the Ali Region and Western Xigaze.
The stability control system of the Ali interconnection project is an important system to ensure the safe and stable operation of the power grid in the Ali Region.
Ali power networking project
Ali power networking project starts from the Duolin 220 kV substation in Shigatse City and ends at 220 kV BAL substation in the Ali area. It is the highest-elevation power grid project in the world so far. The total length of the line is 1689 km.
The average altitude of the tower is 4572 m, and the highest altitude is 5357 m. It is connected with the main network of central Tibet through a 220 kV long-distance transmission line, forming a long-chain grid structure.
Grid stability control system
Many adaptive control plans are added to the stability control strategy to enrich the adaptability of the system
The power supply support of the interconnection channel is less, the support capacity of the receiving end grid and power supply is weak, frequency, voltage, power angle, and other problems after transmission channel interruption are faced. Therefore, it is necessary to build a power grid stability control system with higher requirements for its reliability, accuracy, and sensitivity.
After the power grid fails, according to the operation mode of the power grid, the system can quickly take measures to cut off the generator, load shedding, and line disconnecting, so as to effectively reduce the scope of the power outage and ensure the safe and stable operation of the regional power grid.
The system takes full account of the characteristics of the weak network structure and the rapid change of operation mode in the Ali area. Many adaptive control strategies are added to the stability control strategy to enhance the adaptability of the system.
Power grid protection and control
NR has participated in the different phases of the stability control system of the central Tibet power grid, including the ± 400 kV Qinghai Tibet DC interconnection project, the Sichuan Tibet AC interconnection project, the center Tibet (Lhasa) interconnection project, and the Ali interconnection project.
Based on more than 20 years of experience in power grid protection and control, NR will provide more power grids with high-quality and efficient grid stability control system solutions.