Core Viewpoint - Solid State Transformers (SST) are expected to become the ultimate solution for AIDC power management due to their high efficiency and low footprint, with Delta's 800V SST system reaching MW-level capacity and Nvidia planning full deployment of its 800V high-voltage direct current architecture by 2027 [1][2]. Group 1: Industry Trends - Data centers are moving towards higher power levels, with power supply system efficiency becoming crucial as single cabinet power has increased from 8KW to over 30KW, and Nvidia's single cabinet power reaching 120KW [2]. - Traditional DC distribution methods are facing bottlenecks due to space limitations, copper overload, and low conversion efficiency, necessitating a new power supply architecture [2]. - In typical AIDC projects, power-related equipment costs account for nearly 50% of total costs, indicating high value and continuous iteration [2]. Group 2: SST Advantages - SST achieves high efficiency by replacing traditional transformers with high-frequency power electronics, allowing for system efficiencies of up to 98% [3]. - SST's modular design significantly reduces equipment size by approximately 40%, integrating rectification, conversion, and inversion processes [3]. Group 3: Market Opportunities - The 800V HVDC is seen as a starting point for SST penetration, offering active flexibility and green electricity adaptability, which can open broader application markets [4]. - SST can actively control power quality, addressing grid disturbances and load fluctuations, while also supporting bi-directional power flow [4]. - The new grid architecture using SST can accept 50%-70% renewable energy, improving performance by 1.3-2 times compared to traditional grid structures [4]. Group 4: Related Companies - Key players in SST systems include Sifang Co., Ltd. (601126.SH), China XD Electric (601179.SH), Jinpan Technology (688676.SH), and Xinte Electric (301120.SZ) [5]. - Companies involved in SST materials include Keli (002782.SZ) and Yunlu Co., Ltd. (688190.SH), with products covering a wide frequency range [5].

Investment Rating - The report provides a "Buy" rating for the companies involved in the AIDC power management solutions and SST technology [8]. Core Insights - The data center industry is transitioning to higher power levels, with cabinet power increasing from an average of 8KW to over 30KW, and Nvidia's single cabinet power reaching 120KW. This shift necessitates new power supply architectures due to the limitations of traditional DC power distribution systems [1]. - Solid State Transformers (SST) are positioned as the ultimate solution for AIDC power management due to their high efficiency (up to 98%) and compact design, which can significantly reduce equipment count by approximately 40% [2][3]. - The 800V HVDC system is identified as a starting point for SST penetration, offering active flexibility and compatibility with green energy, which is crucial as new data centers in China are required to have over 80% green energy usage [3]. Summary by Sections AIDC Power Management - The cost of power-related equipment in typical AIDC projects accounts for nearly 50% of total costs, highlighting the importance of efficient power solutions [1]. - SST technology is expected to evolve towards gigawatt-level applications, with Delta's 800V SST system already reaching MW-level capacity [1]. SST Technology - SST replaces traditional transformers with high-frequency power electronics, achieving higher efficiency and smaller size, which is essential for modern data centers [2]. - The modular design of SST integrates multiple functions, reducing the need for various traditional devices [2]. Market Opportunities - Companies such as Sifang Co., China West Electric, Jinpan Technology, and Xinte Electric are highlighted as key players in the SST system and materials market, with significant advancements in efficiency and application [3].