With the transformation of the power system, the scale, structure, and management requirements of the power grid have undergone significant changes. As a result, the existing reliability management methods for transmission networks need to be improved in terms of scope, techniques, and approaches. This paper introduces the methodologies and systems used in reliability performance management for transmission grids in China and North America, comparing the current challenges in China's reliability management under the context of power reform and exploring potential future directions. It serves as a reference for enhancing China’s transmission network reliability performance.
The transmission network is a critical component of the power system, responsible for transmitting electricity while ensuring safety and reliability. A key indicator of a transmission system's performance is its ability to maintain functionality despite equipment failures. This capability reflects not only the quality of design, operation, and maintenance but also the reliability of the equipment itself. For China, which relies heavily on long-distance energy transmission, the evaluation of transmission network performance is particularly crucial.
Globally, the performance evaluation of transmission grids begins with the reliability management of power transmission and transformation facilities. The North American Reliability Organization (NERC) categorizes the reliability performance of the transmission network into two parts: facility reliability and system reliability. System reliability is further divided into transmission capacity and service capability. In contrast, China’s reliability management of transmission grids is still largely focused on facility-level reliability. In 2010, State Grid Corporation integrated transmission capacity indicators into its management framework and improved data collection and evaluation systems. With the rapid growth of renewable energy and ongoing power reforms, the demand for higher reliability has increased, prompting both regulatory bodies and power companies to reassess their approaches.
Domestic scholars have drawn from international research to develop localized reliability evaluation systems. Some studies have adapted North American indices to suit China’s grid characteristics, while others have proposed new metrics aligned with domestic conditions. Despite these efforts, most systems remain within the original framework, lacking in-depth analysis of existing problems and emerging needs.
Based on a comprehensive review of domestic and international practices, this paper compares the differences between China and foreign systems, identifies current issues, and explores the evolving needs of China’s transmission network reliability management. It also highlights the key technologies that will shape the future of this field.
Currently, China’s transmission network reliability management is still in the stage of facility-level reliability. Standards such as the "Power Transmission and Distribution Facilities Reliability Evaluation Procedures" guide the industry, and data collection and evaluation systems are being continuously improved. However, challenges remain in terms of data accuracy, standardization, and depth of analysis. Comparisons with North America reveal differences in classification methods, evaluation indicators, and failure cause categorization, highlighting areas for improvement.
Looking ahead, the impact of power reform and the need for enterprise asset lifecycle management will drive the evolution of reliability performance management. Key areas for improvement include strengthening data authenticity, aligning management objectives, refining evaluation systems, and implementing closed-loop reliability management. These steps will help ensure the sustainable development of China’s transmission network in an increasingly complex environment.
In conclusion, this paper provides insights into the current state of China’s transmission network reliability management, compares it with international best practices, and outlines the future direction of reliability performance under the influence of power reform and enterprise lifecycle management. It offers valuable guidance for optimizing future management systems.
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