October 28，By Graduate School of Shandong University、Sponsored by the Postgraduate Affairs Department of the Party Committee，The 58th issue of 2024 (the 1395th issue in total) "Jixiafeng" graduate academic forum hosted by the School of Electrical Engineering was held in the lecture hall on the fourth floor of the Electric Power Building on Qianfoshan Campus。This forum invites Professor Xie Zhigang from City University of Hong Kong to give the lecture，The theme of the lecture is "Negative Inductance: A Potential Game Changer"。The forum is hosted by Associate Professor Dong Zheng。

  The lecture mainly focuses on the principle of negative reactance、Expand into three parts: application and future implementation methods。First of all, Professor Xie introduced the emerging circuit component concept of negative reactance，It has the opposite characteristics to ordinary inductors，That is, the inductance value is negative，Must be achieved through composition，This negative value inductor can be used to eliminate unnecessary inductive effects in the circuit，To carry out effective compensation and control system optimization，In the power system，Negative reactance can significantly improve the efficiency of the system、Economy and reliability，For example，Negative reactance can be used to offset the positive inductance in the system，Thus reducing the need for reactive power，Reduce transmission loss and improve power factor。By introducing negative reactance，The system can effectively balance reactive power，Reduce reliance on traditional compensation equipment，Thus achieving more efficient power transmission and stable operating status；Secondly，Negative reactance in wireless power transmission、Electromagnetic compatibility、Adjustable filter、Fields such as antenna design and waveguide design have a wide range of potential applications。For example，In wireless power transmission，Negative inductance can be used to offset leakage inductance，Improving the capacity and efficiency of power transmission；In antenna design，Negative reactance can be used for antenna tuning，Provide more compact、More efficient design，Improve radiation characteristics and tuning capabilities at the same time；In waveguide design，Negative inductance helps wireless communication systems expand the frequency range，Improve frequency stability。

  Finally, Professor Xie proposed that negative reactance has broad application prospects，But its implementation still faces some challenges。Negative reactance must be achieved through synthetic devices，This is more difficult to control and stabilize in power circuits，And negative reactance has higher frequency requirements，Requires the synthesizer to operate in a frequency band 2-3 orders of magnitude higher than the application frequency。With the development of technology，Negative reactance is expected to compensate for reactive power、Way to improve power quality and improve power system stability，Widely used in power transmission and distributed energy systems in the future，To achieve more compactness、Providing vital support for lightweight and efficient power system design。

  After the report ends，Participating teachers and students took photos together。This issue of “Jixiafeng” graduate academic forum ended successfully with warm applause from teachers and students。

  About the speaker:

  Xie Zhigang，Chair Professor, Department of Electrical Engineering, City University of Hong Kong，IEEE Fellow，Research scope includes complex networks、Power Electronics and Nonlinear Systems。Won the 2022 IEEE CASS Charles A. Desoer Technology Achievement Award，is the first scholar in China to receive this honor。Won several best paper awards from IEEE and other international journals，And including the Silicon Valley International Invention Exhibition、International Exhibition of Inventions in Geneva, Switzerland、And the Asia International Innovation and Invention Exhibition’s jury commended the Gold Medal and the Invention Grand Prize。Served as chief editor of many international research journals。