The first set of localized DC support capacitors led by the State Grid Economic Research Institute has completed the third-party type test, and its core indicators such as long-term life, loss, and temperature rise have reached the international level, and for the first time in Gansu-Zhejiang ±800 Batch application in kilovolt UHV DC transmission projects. The capacitor serves as the "regulating heart" of flexible DC converter valves and has long relied on imports. The research team not only formulated 135 The specification of technical indicators breaks the bottlenecks of mass manufacturing and material selection, and also innovatively develops an online monitoring system based on high-potential integrated sensors, which ultimately reduces the cost of products by 20% compared with imported products The above promotes our country's flexible DC transmission core equipment industry chain to achieve independent and controllable control.

Interpretation of key information

1. Breakthrough product: DC support capacitors

• Functional positioning: Known as flexible DC converter valve "Stabilize the heart" 。 It plays a key role in storing energy, stabilizing voltage, and absorbing harmonics in converter valves, and is the core component to ensure the safe and stable operation of UHV DC transmission systems.

• previous situation：Long-term dependence on imports, is the "bottleneck" link in our country's industrial chain and supply chain.

2. Significance: Achieve "independent and controllable"

• Technological autonomy: We have overcome a full set of technologies from material selection and technical specifications to mass manufacturing, and have formulated a comprehensive set of technologies135 technical indicatorsStrict norms.

• Industrial chain security: The industrial chain of our country's flexible DC transmission core equipment is no longer subject to others, and the national energy strategic security and the initiative of power grid construction are guaranteed.

• Cost reduction: After localization, the cost of the productIt is more than 20% lower than that of imported products, bringing significant economic benefits.

3. Technical level: international advanced

• It has passed a rigorous third-party type test to prove itLong-term life, loss, temperature riseand other core performance indicators have reached the international level of similar products, meeting the demanding requirements of engineering applications.

4. Innovation highlight: integrated intelligent monitoring

• developedOnline monitoring system based on high-potential integrated sensors。 This means that the status of operating capacitors can be monitored in real time and remotely, and potential faults can be warned in advance, greatly improving the O&M level and reliability of the system.

5. Engineering application: has been successfully implemented

• atGansu-Zhejiang ± 800 kV UHV DC transmission projectrealizedBatch application, proving its technical maturity and engineering applicability.

summary

The successful development and application of the first set of localized DC support capacitors is a major achievement in the field of high-end power equipment manufacturing in China. It is not only a substitute for a single product, but alsoFrom technology research and development, standard formulation, material technology to comprehensive breakthroughs in intelligent monitoringIt has effectively promoted the upgrading and autonomy of the whole industrial chain of our country's UHV DC transmission technology, and laid a solid foundation for the subsequent construction of more advanced flexible DC transmission projects.