CAJ | 학술논문

为了缓解500 kV电网短路电流增长趋势，建设具有抗灾能力的智能电网，需要采取电源-电网-负荷融合的电网规划设计理念，将大容量机组接入220 kV 地区电网。为了解决由此而产生的“大机小网”高频稳定问题，文中提出了一种高频稳定控制方法。该方法根据高频事故时孤网潮流转移功率信号对调速器实施状态转移控制，能够使机组调速系统快速和准确地跟随孤网突变，将汽轮机组调速系统高频稳定裕度从当前的9%提高到50%以上，水电机组调速系统的性能也得到大幅提高，控制系统具有分散协调性、坚固性和兼容性，能够使灾害破坏下残余的送端电网具备生命自持的能力。最后，对机组潮流转移功率的性质进行了推导和仿真，并论述了调速器状态转移控制的方法、模型和仿真效果。
위료완해500 kV전망단로전류증장추세，건설구유항재능력적지능전망，수요채취전원-전망-부하융합적전망규화설계이념，장대용량궤조접입220 kV 지구전망。위료해결유차이산생적“대궤소망”고빈은정문제，문중제출료일충고빈은정공제방법。해방법근거고빈사고시고망조류전이공솔신호대조속기실시상태전이공제，능구사궤조조속계통쾌속화준학지근수고망돌변，장기륜궤조조속계통고빈은정유도종당전적9%제고도50%이상，수전궤조조속계통적성능야득도대폭제고，공제계통구유분산협조성、견고성화겸용성，능구사재해파배하잔여적송단전망구비생명자지적능력。최후，대궤조조류전이공솔적성질진행료추도화방진，병논술료조속기상태전이공제적방법、모형화방진효과。
A composite generator-network-demand planning method is needed today.It requires connection of large capacity generators into 220 kV regional networks where the loading is relatively small.This method will help to cope with the increasing short circuit currents at 500 kV networks,and to develop a smart grid capable of withstanding nature disasters.In order to solve over-frequency stability problem of large generator in a small network,this paper presents a method of speed governor state transition control based on signal of power flow transfers.The method can quickly and precisely regulate power of generator unit following abrupt changes of an isolated grid.It can increase over-frequency stability margin of speed governor at steam turbine unit from 9% to 50%.The performance of speed governor at hydropower unit can also be significantly increased.The control system is decentralized robust and compatible with other systems.It can effectively maintain the operation of the remaining power networks with residual generation capacity after the overall system is damaged by natural disasters.Case studies are given to show the effectiveness of the proposed methods.