WEIQI ELECTRIC
High-Voltage Direct Current: A Major Breakthrough in Power Transmission
2025-07-03
In modern power systems, high-voltage direct current (HVDC) transmission technology is playing an increasingly vital role. It is a method that uses stable DC electricity to transmit large amounts of power over long distances, offering numerous significant advantages.
The high-voltage direct current (HVDC) transmission system primarily consists of two converter stations and a DC transmission line. Electrical energy is extracted from a single point in the three-phase AC grid, converted into DC at the converter station, and then transmitted via overhead lines or cables to the receiving end. At the other end, it is again converted back into AC at the second converter station before being fed into the recipient’s AC grid. The system’s key equipment includes converters, converter transformers, smoothing reactors, AC filters, DC surge arresters, and control and protection devices—among which the converter plays a crucial role as the core component enabling both rectification and inversion functions at the converter station.
The advantages of high-voltage direct current (HVDC) transmission technology continue to expand its application scenarios. First, it enables point-to-point long-distance power transmission—such as in ultra-high-voltage DC projects—making it ideal for efficiently delivering large amounts of electricity over vast distances from western hydropower, major coal-fired power, and large-scale wind-solar energy bases. Additionally, HVDC is widely used in submarine cable projects due to its unique benefits in underwater power transmission. Moreover, HVDC plays a critical role in connecting and isolating large-scale power grids, facilitating the interconnection of grids operating at different frequencies while also enabling the seamless integration and separation of extensive grid networks. With ongoing technological advancements, particularly the emergence of flexible HVDC systems, DC transmission is increasingly being applied in areas such as integrating renewable energy into the grid, supplying isolated load centers, and modernizing distribution networks.
In the new energy vehicle sector, high-voltage DC relays are one of the critical components. As the level of automotive intelligence continues to rise, the number of high-voltage DC relays used per vehicle is steadily increasing. According to relevant reports, the new energy vehicle market holds tremendous potential for demand for high-voltage DC relays—driven by both incremental needs and replacement requirements.
In the field of high-voltage direct current (HVDC) transmission, the potential demand for relays is equally significant. As HVDC projects continue to be built and developed, the need for high-voltage DC relays is steadily increasing—crucial for ensuring the safe and stable operation of transmission systems.
In terms of charging and battery-swapping systems, high-voltage DC relays play a critical role—whether in charging or battery-swap modes. The current state of development in these systems, along with emerging trends for the future, underscores their significant potential demand for high-voltage DC relays.
In the field of photovoltaic power generation, high-voltage DC relays are also widely used. As the photovoltaic industry continues to grow, so does the demand for high-voltage DC relays—crucial for ensuring the reliable operation of photovoltaic systems.
Research progress in high-voltage direct-current (HVDC) transmission technology continues to drive the growth of the entire industry. For instance, scholars have conducted extensive studies on the spatial charge and electric field distribution characteristics of XLPE insulation in HVDC submarine cables. These studies not only enhance the performance and reliability of HVDC systems but also provide crucial theoretical support for the development and application of related equipment.
In summary, high-voltage direct current (HVDC) transmission technology has demonstrated tremendous potential and vast application prospects in the power transmission sector. From electric vehicles powered by renewable energy to photovoltaic systems, from point-to-point long-distance transmission to large-scale grid interconnections and isolation, its applications continue to expand. Meanwhile, as related research deepens and technology advances steadily, HVDC systems—and key components like HVDC relays—will undergo continuous optimization and refinement, paving the way for more efficient global energy transmission and contributing significantly to sustainable development.
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2025-07-03
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