Recently，The academic monograph "Calculation of Eigenvalues ​​of Large-Scale Time-Delay Power Systems (Second Edition)" by Professors Ye Hua and Liu Yutian of the School of Electrical Engineering is published by Science Press。The monograph is prefaced by Academician Cheng Shijie，Basic Chapter、Methods、Testing and Application，more than 700,000 words in total。

Time delay is common in circuits、Optics、Neural Network、Biological environment、Dynamic systems in machinery and other fields，As the most complex artificial system on earth, the power system is no exception。Time delays in power systems，Caused by the introduction of measuring elements and the inherent characteristics of control and actuating elements，is an important factor leading to poor controller performance and system instability。However，Due to the infinite-dimensional characteristics of the time-delay system，There are huge challenges in accurately modeling and efficient stability analysis。At the same time，The application scenarios of power systems enable adaptability in scale、Higher requirements have been put forward in terms of calculation accuracy and analysis efficiency。

For this，Monograph focuses on key scientific issues of accurate and efficient calculation of eigenvalues ​​of time-delay systems，Systematically discusses the calculation theory of eigenvalues ​​of large-scale time-delay power systems based on spectral discretization、Key technologies and series of algorithms，Include spectral mapping、Spectral discretization、Spectral transformation、Five parts of spectrum estimation and spectrum correction，Solved the feasibility problem of accurate calculation of eigenvalues ​​of time-delay power systems，Breaking through the computational efficiency bottleneck of accurately obtaining eigenvalues ​​of large-scale time-delay power systems at the level of 10,000 nodes。Relying on the results of the monograph，Developed the world’s first time-delay power system eigenvalue calculation commercial software SSAP-PEIGD，Processing scale、Accuracy、Internationally leading efficiency and other indicators，Become a basic tool for power system stability analysis；Supporting "key technologies and applications of large-scale time-delay power system oscillation analysis and control" won the second prize of the Shandong Province Science and Technology Progress Award in 2021。

The monograph is supported by the National Natural Science Foundation of China (No.: 51677107，52077126) and Shandong Province Taishan Scholars Young Experts Project (No. tsqn202211286)。