快速开关限流型交流母线电压保持设备研究  

Research on Current-limiting Type AC Bus Voltage Maintaining Equipment with High-speed Switch

作　　者：杨兵[1] 刘少飞 方太勋[1] 谢晔源[1] 许元震 曹磊 徐舒[1] YANG Bing;LIU Shaofei;FANG Taixun;XIE Yeyuan;XU Yuanzhen;CAO Lei;XU Shu(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《高压电器》2023年第12期48-54,共7页High Voltage Apparatus

摘　　要：传统“钢煤石化”企业电网的网架结构复杂,以电缆连接为主。当某一条联络线或者负荷发生短路故障后,由于故障清除时间较长(100ms以上),导致企业内部电网的交流母线电压长时间暂降,引发厂内变频设备、各种数字设备等跳闸,给生产运行带来重大隐患。文中提出一种快速开关限流型交流母线电压保持设备(HSBVP),实现对交流母线电压快速支撑,具备起效时间快,设备成本低等优势。文中首先详细分析HSBVP的工作过程和安装位置,形成设备应用场景。其次针对快速开关体积大,无法实现与常规空气柜开关柜尺寸兼容的问题,文中提出上下封闭磁路设计的紧凑型斥力机构,提高斥力机构效率,压缩机构体积;同时采用“一拖三”电磁斥力机构设计方案,有效提高三相机构的分合闸时间的一致性。另外文中搭建企业电网等效阻抗计算模型,并通过真实企业电网机电暂态模型验证,形成一套限流电抗器容量的计算方法。最后本设备通过第三方型式试验,快速开关在接到分位指令5ms内实现直流分量超过80%的31.5kA的故障电流的深度限流,快速维持上一级母线电压稳定,有效解决了企业内部电网的电压暂降问题,具备良好的推广前景。The grid structure of traditional“Steel Coal Petrochemical”enterprises,which is mainly connected by ca-bles,is complex.The short circuit of a certain line or a load,due to long fault clearance time(more than 100 ms),causes long term AC busbar voltage sag inside the grid of the enterprise,leads to tripping of such various equipment as conversion equipment and various digital equipment inside the enterprise and brings hidden trouble to the produc-tion and operation.In this paper,a high-speed switch current limiting AC bus voltage maintaining equipment(HSBVP)with such advantage as fast onset time and low cost is proposed to achieve rapid support of AC bus voltage.Firstly,the working process and installation position of the HSBVP are analyzed in detail so to form the application scenario of the equipment.Secondly,the high-speed switch has no way to achieve compatibility with the size of conventional air breaker cabinet due to the larger volume.A compact electromagnet repulsion mechanism with upper and lower closed magnetic circuit is proposed to improve the efficiency and compress the volume of the repulsion mechanism.At the same time,the design scheme of“one driving three”electromagnetic repulsion mechanism is adopted to ef-fectively improve the opening and closing time consistency of three-phase mechanism.In addition,the equivalent im-pedance calculation model of enterprise power grid is set up in this paper to form a set of calculation method of capac-ity of current limiting reactor through the electromechanical transient model verification of real enterprise power grid.Finally,the equipment passes the type test performed by the third-party and the high-speed switch,within 5 ms after receiving the trip command,achieves deep current limit of fault current at 31.5 kA with DC component exceeding 80%,maintains quickly the voltage stability of the upper busbar,solves effectively the voltage sag of the internal power grid of the enterprise and possesses a good promotion prospect.

关 键 词：电压暂降 母线电压保持 快速机械开关 电磁斥力机构 快速限流 

分 类 号：TM714.2[电气工程—电力系统及自动化]