On January 20, 2022, the first converter valve of the China Great Bay Area DC back-to-back project was successfully put into operation for the first time, marking an important step forward for the interconnection of the core areas of the Eastern and Western Pearl River Delta of the Guangdong power grid. The converter valves were supplied by NR.
Unit 1 on the East side of Guangzhou took the lead in entering the system commissioning stage among the four units of the whole project, creating a new record of successful operation and "zero" sub-module failure, thanks to various innovations and efforts.
Safety and reliability of the sub-module
In the design, the iterative upgrading to improve the reliability is made on the primary design and secondary board, which effectively ensures the safety and reliability of the sub-module.
In terms of test methods, two non-invasive whole tower test methods have been pioneered. One is the valve tower rapid test technology, which can compress the test time of a single tower by at least 5 times, and maintain the integrity of the secondary circuit and optical fiber circuit of the sub module in the whole process.
Communication status data of submodules
Two technologies greatly improve the test efficiency and reliability of the converter valve subsystem
The second is the communication on-line monitoring technology, which obtains the communication status data of submodules in real time. The two technologies greatly improve the test efficiency and reliability of the converter valve subsystem, and lay a foundation for the success of the one-time operation of the converter valve.
Through technological innovation, NR assisted the owner to complete the set objectives with high quality and quantity under the condition of tight deadlines. It took only 45 days from the installation of the converter valve to the commissioning of the system.
Scientific and technological innovation
The DC back-to-back project of Guangdong power grid will strengthen the power supply guarantee of the China Great Bay Area. At the same time, it also has important functions in fault isolation, emergency power support, power exchange, and so on.
NR will continue to practice the corporate purpose of "creating value and serving society" through scientific and technological innovation, and providing customers with high-quality products, solutions & services.
