大型空心电抗器对直流系统影响的测试与仿真

摘要

The electromagnetic compatibility (EMC) problem caused by large-scale air-core reactors in substation is increasingly serious.The measured maximum interference of 110 V DC system in a substation has amounted to 52 V,which seriously affects the safe and stable operation of substations.In order to research the interference characteristics,the interference's amplitude,frequency,distribution characteristic are measured,and three-dimensional scale models of the reactor,ground network,and DC system are established and their equivalence is verified.On this basis,this paper presents the ways to improving the height of the reactor and laying shielding material under the reactor,and evaluates the measures' effects.From the simulation results,the common-mode interference voltage gives priority to three harmonics.The anti-interference method proposed can effectively reduce the influence of air-core reactor on DC system.%变电站中大功率空心电抗器导致电磁兼容问题(EMC)日益严重.现实测某变电站110 V直流系统的最大干扰已达52 V,严重影响了厂站的安全稳定运行.为了研究其干扰特征,对现场干扰的幅值特性、频率特性和分布特性进行了实测,并对电抗器、地网和直流系统建立三维等比例模型,对模型的等效性进行验证.在此基础上,提出了提高电抗器的高度和在电抗器底部敷设屏蔽材料的措施,对其效果进行评估.从仿真结果可以看出,共模干扰电压以三次谐波为主,通过所提出的抗干扰方式能够有效减小空心电抗器对直流系统的影响.