报告题目: perspectives on the future smart electric system
报 告 人：prof. klaus froehlich， eth zurich教授，国际大电网会议cigre前任主席
报告时间：2017年6月22日，星期四，下午16:00
报告地点：清华大学西主楼3区102
主办单位：清华大学电机系
联 系 人：康重庆
报告人介绍：
klaus froehlich received a ph.d. in technical sciences from the university of technology in vienna, austria. for more than 11 years he worked for abb switzerland and usa in development of high voltage equipment. from 1990 till 1997 he was employed as a full professor for switchgear and high voltage technology at the university of technology in vienna, austria followed by a full professorship for high voltage technology at the swiss federal institute of technology (eth) in zurich, switzerland. he is a guest professor at the tsinghua university in beijing. klaus froehlich has a fellow membership in electrosuisse and ieee. he also is a member of the swiss academy of engineering sciences. in cigre his latest positions were chairman of the cigre technical council and president of cigre until 2016.
报告内容介绍：
there is no doubt that the electric power system is in a revolutionary transition. driving key factor is first of all the need for massive integration of renewable variable sources such as wind power and photovoltaic (pv) combined with an increasing numbers of storage elements. also market needs and electrification of powerless areas (electricity for all people) push for a change. load flow in many places turns from uni-directional into bi-directional due to massive increase of storage and millions of prosumers the latter often causing reversed load flow from low voltage to high voltage. in cigre two grid models are considered. first an increasing importance of the transmission system and secondly the emergence of microgrids and microgrid clusters locally smartly managed - islanded or grid connected for backup. on the transmission level technology is widely mature. hvdc at uhv level, multi-terminal hvdc installations, digital substations, submarine cables down to 3000m, mature offshore connections and so-called hybrid lines are just a few examples. however, to be successful many projects would need more political coordination and environmental consideration. on the low voltage level the microgrid concept as recently published by cigre is very suitable for a systematic handling of the very complex interaction between sources (mainly variable such as pv), storage and managed load. different storage options are promising such as power to heat, power to gas and chemical batteries. combined they lead to self-contained buildings without connection to any other external energy source. all these elements are new for the grid and will influence significantly its evolution. in any case it is obvious that grid control and management need to be very intelligent. in the light of the quickly increasing emergence of e-mobility and other new consumers such as heat pumps and maybe heat storage the grid becomes more complex than ever.
considering the vast numbers of prosumers in many areas (e.g. europe) the low voltage grid will have an increasing importance for regulation and supporting the entire grid. for academia there is a wide field of work ahead in order to come up with economic and adequate principles in all fields.
