Passion! Saisi clock server helps many national UHV projects realize power "flash delivery"

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Passion! Saisi clock server helps many national UHV projects realize power "flash delivery" [Copy link]

Recently, two UHV lines in China were officially put into operation. Many national UHV projects, such as the Longdong-Shandong UHV DC transmission project and the ±800 kV Hami-Chongqing UHV DC transmission line project, undertaken by CS, have been fully connected. CS clock servers have helped many national UHV projects achieve nanosecond-level power "flash transmission" .

Passion! Saisi undertakes clock synchronization projects for many national UHV projects

UHV grid refers to AC grid of 1000kV and above or DC grid of ±800kV and above. Compared with ordinary substations, UHV grid has higher requirements on time and frequency synchronization technology and equipment due to the complexity of its control system and the harsh terrain and geological environment. The accuracy requirement of time synchronization system has reached the nanosecond level (1s=10^9ns).

As a champion company in the field of clock synchronization, Sais has recently undertaken clock synchronization projects for a number of national UHV projects, including Longdong-Shandong, Hami-Chongqing, Jinshang-Hubei, Ningxia-Hunan, and Qiemo-Ruoqiang, empowering the construction, production and investment of the country's "UHV power highway".

0 1 Longdong-Shandong ±800 kV UHV DC transmission project

The Longdong-Shandong UHV DC transmission project starts in Qingyang City, Gansu Province, and reaches Tai'an City, Shandong Province via Shaanxi, Shanxi, and Hebei. The line is 926.4 kilometers long and has a transmission capacity of 8,000 megawatts. It is a key project in the country's "14th Five-Year Plan" power planning and the first "wind, solar, thermal and storage integrated" UHV transmission project in my country.

0 2 Hami-Chongqing ±800 kV UHV DC transmission optical fiber communication project

The Hami-Chongqing ±800 kV UHV DC transmission project is one of the 102 major projects identified in the country's "14th Five-Year Plan" development plan. This UHV DC transmission project is an important part of the "Xinjiang Power into Chongqing" project and the third DC channel for "Xinjiang Power Export". The line is about 2,290 kilometers long and has a designed transmission capacity of 8 million kilowatts.

0 3Jinshang -Hubei ±800 kV UHV DC transmission project

The Jinshang-Hubei UHV Project is currently the world's highest-altitude UHV DC transmission project and the first UHV DC project in my country to enter the hinterland of the Sichuan-Tibet Plateau. The line is 1,901 kilometers long and passes through four provinces (autonomous regions and municipalities), namely Tibet, Sichuan, Chongqing and Hubei.

0 4 Ningxia-Hunan ±800 kV UHV DC transmission project

Ningxia-Hunan ±800 kV UHV DC transmission project: spanning six provinces (autonomous regions and municipalities), namely Ningxia, Gansu, Shaanxi, Chongqing, Hubei and Hunan, it is not only the country’s first power transmission channel that mainly transmits clean energy, but also the country’s first UHV transmission channel that mainly develops a large desert photovoltaic base and transmits new energy.

0 5 Qiemo-Ruoqiang 750 kV power transmission and transformation project

The Qiemo-Ruoqiang 750 kV transmission and transformation project is a key project in the country's "14th Five-Year Plan" power development plan, and is also an important part of the Xinjiang Tarim Ring Network, the largest 750 kV ring network project in my country.

The "hard core problem" of UHV engineering - clock synchronization

UHV power grids usually span a very wide area, with terrain spanning plateaus, plains, hills, etc., and require ultra-long-distance real-time dispatching and transmission of different power stations and different lines, which further deepens the UHV power grid's high requirements for the high precision of clock synchronization technology and the environmental adaptability of equipment.

The UHV power transmission system involves a large amount of real-time data monitoring, data transmission and precise and timely scheduling . Any slight clock deviation between multiple long-distance, high-speed transmission equipment may lead to operational scheduling errors, equipment failure and even a large amount of energy loss.

In addition, the country has recently introduced many policies to promote the use of single Beidou terminal equipment in the entire industry, especially in the pillar industries of society . The satellite modules of the existing clock servers mostly use GPS and Beidou multi-mode to ensure the reliability of the system. In the UHV power grid, many power equipment are installed in areas far away from cities or even in mountainous areas, and satellite signals may face interference or instability. In the single Beidou mode, there is a lack of backup of different systems, and once the satellite signal fails, the timing will not be able to be carried out .

Based on this, CESI has independently developed and designed a clock synchronization solution for UHV power grids, which effectively solves industry pain points and fully empowers the construction of the national UHV power grid.

CEST UHV Engineering Clock Synchronization Solution

Electricity is the "lifeline" of national economy and people's livelihood, and ensuring the security of electricity energy is a top priority for economic and social development.

In order to achieve high-precision and high-reliability single Beidou timing application in UHV projects and solve the difficulty of weak single satellite signal, Saisi proposed to form a new signal protection through the combination of ground signal + satellite signal. At the same time, two Beidou satellites (B1 + B3) are used with differentiated configuration to ensure the security of the timing source .

CEST UHV Engineering Clock Synchronization Solution

The Saisi clock server used in the above solution is an integrated device that supports dual Beidou time and frequency synchronization. The product adopts digital phase-locked loop technology and FPGA-based self-time algorithm, supports IEEE1588 protocol, supports Beidou satellite common view function, and can provide high-precision and high-reliability time and frequency reference signals.

At the same time, the product can provide a reference clock source that complies with the ITU-T G.811 and G.812 standards. In addition to providing traditional 2.048Mbit/s and 2.048MHz frequency synchronization signals, it can also provide 1PPS+ToD, NTP, PTP and other time outputs.

This clock server has been domestically produced and has passed the 8th and 9th intensity earthquake resistance test certification of China Telecommunication Technology Laboratory, obtained the first, second and third level network access licenses and single Beidou terminal equipment test reports issued by the Ministry of Industry and Information Technology , passed the low-pressure test, and is also suitable for plateau areas, with strong environmental adaptability. At present, this product has been widely used in mobile operators' communication synchronization networks, power system communication synchronization networks, rail transit and other scenarios with extremely high requirements for clock synchronization.

As a "pioneer" in the field of clock synchronization, CSAT has independently developed dozens of key technologies for time and frequency synchronization, and created a nationwide product supply chain from "time source-timing end-time user-time and frequency chip" , which can serve as a "strong engine" and "hard support" for the time and frequency synchronization of the entire industry.

Some of Seth's clock products

*Image source: canva

Jacktang

The clock server has been domestically produced. This is a must.