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 Guangdong power grid. The converter valves were supplied by NR Electric (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. 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.
Whole tower test methods
One is the valve tower rapid test technology, which can compress the test time of a single tower
In terms of test methods, two non-invasive whole tower test methods are pioneered. One is the valve tower rapid test technology, which can compress the test time of a single tower by at least five times, and maintain the integrity of the secondary circuit and optical fiber circuit of the submodule in the whole process.
The second is the communication online monitoring technology, which obtains the communication status data of sub-modules 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.
objectives with high quality
Through technological innovation, NR assisted the owner in completing 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.
The DC back-to-back project of the 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 the society' through scientific and technological innovation and providing customers with high-quality products, solutions & services.
