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].

Core Points - The construction of the "Tibet-Guangdong DC Project" has commenced, which is a key cross-provincial power transmission project under China's 14th Five-Year Plan, representing the world's strongest transmission capacity and the largest investment scale in flexible DC transmission technology [1] - The project spans approximately 2,681 kilometers across Tibet, Yunnan, Guangxi, and Guangdong, with a total investment of about 53.2 billion yuan and a rated transmission capacity of 10 million kilowatts [1] - The project aims to convert Tibet's resource advantages into economic benefits by facilitating the transmission of clean energy [1] Technical Challenges and Innovations - The project addresses the challenge of integrating large-scale renewable energy in high-altitude areas by employing domestically developed, world-leading flexible DC transmission technology [2] - The technology allows for flexible scheduling of green electricity from different regions and times, ensuring uninterrupted power supply with a transmission time of just 9 milliseconds from Tibet to Guangdong [2] - The collaboration between Southern Power Grid Company and State Grid Corporation aims to tackle significant technical challenges related to high-altitude DC transmission and the integration of renewable energy into weak grids [2] Research and Development Achievements - The research team has conducted over 3000 discharge tests and completed 114 test groups, yielding valuable data for high-altitude discharge [3] - The development of the world's first energy self-balancing flexible DC converter valve and breakthroughs in ultra-long-distance multi-terminal flexible DC fault crossing have been achieved [3] - The project emphasizes digital transformation, aiming to implement machine-based operations in less populated areas and promote digital design and digital twin technology [3] Future Outlook - The Tibet-Guangdong DC Project is expected to be fully operational by 2029, with an annual transmission capacity of over 43 billion kilowatt-hours of clean energy to the Guangdong-Hong Kong-Macao Greater Bay Area, equivalent to half of the annual output of the Three Gorges Dam [3]

Core Viewpoint - The construction of the Zang-Guangdong DC project marks a historic achievement in power transmission, being the world's largest flexible DC transmission project, aimed at transporting clean energy from Tibet to Guangdong [1][4][8]. Project Overview - The Zang-Guangdong DC project spans over 2,600 kilometers, crossing various geographical terrains including the Qinghai-Tibet Plateau and the Yunnan-Guangxi region, with a planned capacity to transmit 43 billion kilowatt-hours of clean energy annually [1][8]. - The project is expected to enhance the renewable energy consumption responsibility weight in Guangdong by 3.8 percentage points and increase power supply capacity by 5 million kilowatts for major cities like Guangzhou and Shenzhen [8]. Technical Challenges and Innovations - The project faces significant technical challenges due to its vast scale and complex environmental conditions, necessitating extensive research and development in high-altitude power transmission technologies [4][11]. - A new energy self-balancing flexible DC converter topology has been developed, which allows for efficient management of surplus energy during grid faults, ensuring system safety and stability [12][13]. Research and Development Efforts - The project has involved rigorous field investigations and data collection, with over 15,000 original data points gathered to support construction planning and environmental assessments [2][3]. - Research teams have conducted numerous high-altitude experiments to understand the electrical behavior in extreme conditions, leading to breakthroughs in high-altitude discharge testing and neutron radiation effects on power devices [5][6]. Strategic Importance - The Zang-Guangdong DC project is pivotal for optimizing national energy resource allocation and enhancing regional economic development, facilitating the transfer of clean energy from the resource-rich west to the economically vibrant east [8][9]. - The project also represents a significant collaboration between major power grid companies in China, aiming for mutual benefits and resource optimization [9][10].