CAJ | 학술논문

研究同时包含特高压交流和特高压直流华东电网的动态特性有必要搭建电磁仿真平台.为提高电磁平台仿真效率,在保持电网原有动态特性的前提下,在机电暂态仿真环境下对原有网络中非关注的和低电压等级网络分别进行了等值,从而达到缩减规模的目的.采用同调等值法进行外网等值,基于受扰轨迹主导群方法识别同调群,并通过弱化励磁系统调压能力和调整原动机调速系统的调频能力,对等值机的参数进行了修正.对低电压等级网络等值时,首次提出了按与直流关联紧密程度不同而采用不同的工程实用等值方法,兼顾了等值效果和仿真效率.
연구동시포함특고압교류화특고압직류화동전망적동태특성유필요탑건전자방진평태.위제고전자평태방진효솔,재보지전망원유동태특성적전제하,재궤전잠태방진배경하대원유망락중비관주적화저전압등급망락분별진행료등치,종이체도축감규모적목적.채용동조등치법진행외망등치,기우수우궤적주도군방법식별동조군,병통과약화려자계통조압능력화조정원동궤조속계통적조빈능력,대등치궤적삼수진행료수정.대저전압등급망락등치시,수차제출료안여직류관련긴밀정도불동이채용불동적공정실용등치방법,겸고료등치효과화방진효솔.
To investigate the dynamic characteristics of East China Power Grid,which contains UHVAC,UHVDC and multiinfeed HVDC,it is necessary to build the electromagnetic transient simulation platform.For efficiency factors,on the premise of reserving the dynamic characteristics of the original power system,both the unconcerned network and low voltage level grids are reduced.In order to simplify the unconcerned network,the coherency equivalence approach is adopted.The coherency identification is based on the dominant mode of the trajectories based on EEAC theory.The parameters of the equivalent generator are adjusted by weakening the voltage-regulating capability of the exciter and tuning the frequency-regulating capability of the equivalent governor.Differently effective and practical methods are adopted to reduce the low voltage level network by their relevancy to DC's inverter.Simulation results show that the equivalent effect and efficiency are well balanced with the suggested practical dynamic equivalence method.