19:00-22:00 on the evening of November 22, 2020，The fourth cloud salon of the Global Energy Internet University Alliance and the fourteenth youth cloud salon of the China Electrotechnical Society "Large Power Grid Operation and Control" - Senior Scholar Lecture Hall was successfully held。This cloud salon is co-sponsored by the Global Energy Internet University Alliance and the China Electrotechnical Society，Power System and Integrated Energy Science Group of Youth Working Committee of China Electrotechnical Society、Co-organized by IEEE PES Youth Working Committee and Shandong University。Associate Researcher He Dongxin from the School of Electrical Engineering of Shandong University serves as the conference organizer。Online reporting and discussion through Tencent Conference、A combination of WeChat group interaction and simultaneous live broadcast on the China Electrotechnical Society event platform，The report of this event is rich and substantial，The atmosphere of participation was enthusiastic，A complete success.

The opening of the conference was hosted by Professor Ma Jing of North China Electric Power University，Secretary-General Han Yi of China Electrotechnical Society、Executive Vice Dean Zhang Hengxu of the School of Electrical Engineering of Shandong University delivered opening speeches respectively。

In the special report session, four well-known scholars in related research fields were invited to give wonderful academic reports on the control and protection technology of high-proportion renewable energy access to the power grid。Associate Professor Shi Fang of Shandong University hosted the special report session of this event。

Professor Song Guobing from the Department of Electrical Engineering of Xi'an Jiaotong University made a speech titledReport on "Fault Analysis and Relay Protection Issues of AC-DC Hybrid Power Grid"。Detailed explanation of each control link of AC and DC power grid、Inverter power supply、The impact of FACTS, etc. on relay protection，Using vivid cases to analyze the current challenges faced by relay protection in simple and easy-to-understand terms，And conducted an in-depth analysis of several key issues，Drawed a series of important conclusions。

Challenges and future development trends for power system stability，Li Wei, deputy general manager of Guodian Nari Power Grid Stability Control Technology Branch, researcher-level senior engineer, conducted a speechReport titled “Understanding of Stability Characteristics of my country’s Power System and Thoughts on Fault Prevention”。Discussed the impact of large-scale renewable energy integration on the stability characteristics of the power grid，Explains the development ideas of the three lines of defense of my country’s power grid security defense system，Combined with specific project cases, several development directions of power grid stability control technology are given。

Professor Xin Huanhai, Director of the Department of Electrical Engineering, School of Electrical Engineering, Zhejiang University, shared a speech entitledReport on "Generalized Short-Circuit Ratio of New Energy Power Systems"。The report targets high proportion of renewable energy connected to the grid with low inertia、Low short circuit ratio、“Three low problems” such as low frequency tuning capability，The definition and function of generalized short-circuit ratio of different power grid forms are given in detail，Explains the calculation process of generalized short-circuit ratio of complex power grid，And introduces its specific application scenarios。

Executive Vice Dean Zhang Hengxu, School of Electrical Engineering, Shandong University focuses on“High-proportion renewable energy grid frequency technology system”，Discussed the impact of high proportion of renewable energy access on the power grid signal form、Fault form、Stable form、Control the influence of form，Explains the role of frequency control in each line of defense、Coordinated control methods and new control methods，Discussed the evolution direction of frequency control and several deep-seated issues。

In the guest interview session，The interview session was hosted by Professor Zhang Hengxu from the School of Electrical Engineering of Shandong University。Professor Song Guobing starts with the training requirements and training plan for students majoring in relay protection at Xi'an Jiaotong University，Emphasis on the importance of basic knowledge and scientific literacy；Dr. Li Wei starts from the company’s talent needs and the characteristics of new recruits，Concluded that solid professional knowledge and comprehensive abilities are the most important assets for young students in their future careers；Professor Xin Huanhai combines his personal growth experience，Published profound insights into the career path planning and methods of improving scientific research capabilities of young scholars。Experts also patiently answered the professional and technical questions raised by the audience、Detailed answer，It points out the direction for young scholars to continue their in-depth research。Last，Professor Li Yong of Hunan University gave the closing speech。

Global Energy Internet University Alliance Cloud Salon aims to promote mutual exchanges between units，Actively promote work related to university alliances。Related scientific research around Energy Internet、Talent training and other topics，Irregular salon events，Mainly focused on reports and exchanges between experts and scholars，And invite senior scholars from alliance universities to attend the conference and comment。Take"Senior Expert Lecture" format，Invite authoritative experts in this discipline and related disciplines to give lectures，Focus on academic hot spots，For the growth of young scholars、Related issues in the process of becoming a talent，Guidance for young scholars。