基于网荷终端的用户低压负荷紧急控制

目前安装网荷终端的用户可切负荷集中在10 kV以上,在紧急切负荷时把很多重要的低压400 V负荷同时切除了。为进一步减少紧急切负荷对用户生产的影响,通过对现场用户400 V负荷性质、容量、设备的调研,提出了符合现场用户特点的设备改造负荷接入方案。针对400 V负荷精细化采集、快速控制的需要,及现场实施的可行性、经济性要求,设计了针对集中式和分散式两种类型用户的400 V负荷快切方案,并完成了现场用户试点实施。通过研制一种基于面向通用对象的变电站事件通信(generic object oriented substation event,GOOSE)的网荷子单元,对方案进行优化改进,使其满足了紧急切负荷的动作快速性要求。

Emergency Load Shedding of User Low Voltage Based on Grid-load Terminal

In the power user installed grid-load terminal,many important loads at low voltage are cut in large power users during emergency load shedding action.In order to reduce the adverse affect to power users,a detailed inquiry of user low voltage load is executed in fields on load character,volume and switch devices.According to the needs of precise acquisition and emergency control of user 400 V load,also for economic reasons,three schemes are proposed for user 400 V load swift shedding.A novel terminal subunit based on GOOSE communication is developed at decentralized and concentrated user loads.Through improvement,the 400 V load cutting delay is reduced and the performance can satisfy the requirements of emergency load shedding.