The converter valve is the heart of flexible DC transmission. It is a bridge between DC and AC. It has the highest technical content and the greatest challenge in flexible DC main equipment.
The successful development of this UHV flexible DC converter valve means that China Southern Power Grid has extended the flexible DC technology to ±800 kV UHV for the first time in the world, and the transmission capacity has been increased to 5 million kW, which is ±800 for flexible DC technology. The implementation of the 1000 volt Wudongde power transmission Guangdong DC project and the subsequent UHV DC transmission project provides a solid guarantee.
The project realized the power module unit integrated with the switching device and the capacitor component, and built it into a 800 kV large valve tower in the form of “building blocksâ€. The height is 15 meters, the length is 9 meters, the width is 7 meters, and the weight is about 70 tons. The weight of a large C919 passenger aircraft.
According to reports, the Wudongde DC project requires a total of 72 such large valve towers. Since the project started in September last year, the theory and method of UHV flexible DC have been proposed. The feasibility and demonstration of flexible DC in Wudongde DC project have been demonstrated, and the hybrid DC physical test has been carried out for the first time in the world. Provide technical support for the feasibility study and special research in the early stage of the demonstration project, which will support the next step of project promotion.
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