绿电“闪送”背后的科技攻坚战

Core Viewpoint - The article discusses the construction of the Tibet-Guangdong Direct Current Project, which is the world's most advanced flexible direct current transmission project, aiming to deliver clean energy from the Tibetan Plateau to the Guangdong-Hong Kong-Macao Greater Bay Area over a distance of 2,681 kilometers [1][5]. Group 1: Project Overview - The Tibet-Guangdong Direct Current Project is the first ultra-high voltage project to traverse such complex terrain, facing challenges such as high altitude, frozen ground, geological disasters, and environmental protection [1]. - The project spans 2,681 kilometers, with nearly 90% of the route being mountainous and 30% at high altitudes, reaching a maximum elevation of 5,300 meters [1]. Group 2: Technical Challenges - The project involves significant technical challenges, including conducting high-altitude long air gap discharge tests to understand the electrical field behavior and ensure the safety of converter station equipment [2]. - The team conducted over 3000 discharge tests to gather crucial data for high-altitude operations, overcoming the difficulties posed by low oxygen levels and extreme temperature variations [2]. Group 3: Innovations and Solutions - A new energy self-balancing topology for flexible direct current converters was developed to address the issue of energy surges during grid faults, ensuring the stability of the system [3]. - The project also tackled the challenge of cosmic radiation affecting power devices at high altitudes, leading to the establishment of safety voltage thresholds and measures to reduce failure rates [4]. Group 4: Expected Impact - Upon completion, the project is expected to deliver over 43 billion kilowatt-hours of clean energy annually to the Guangdong-Hong Kong-Macao Greater Bay Area, equivalent to half the annual output of the Three Gorges Dam, enhancing power supply capacity by 5 million kilowatts for both Guangzhou and Shenzhen [5].