基于保护配置现状的智能配电网大功率缺额孤岛自愈方案  

Island Self-healing Method of Smart Distribution Network with Large Power Shortage Based on Allocation Status of Protection

作　　者：鲍有理 张敏[1] 徐培栋 

机构地区：[1]国网无锡供电公司,江苏无锡214061 [2]国网江苏省电力公司检修分公司无锡分部,江苏无锡214200

出　　处：《江苏电机工程》2016年第6期61-64,69,共5页Jiangsu Electrical Engineering

摘　　要：分布式电源(DG)大量接入低压配电网,在故障扰动时,系统容易进入低供电质量的孤岛失稳运行状态。当孤岛电源容量远小于负荷需求时(存在大功率缺额),通过改进保护配合方案实现孤岛自动恢复正常运行状态是关键。基于低压配电网低频减载装置与备自投装置的配置现状,区别于传统整定方案,提出了一种零增加电网投资的智能配电网孤岛自愈方案。方案以优先保证机组安全为目标,通过改进定值整定方案,实现机组安全最优的目标,保证了供电负荷零损失自动并网运行,通过实际电网故障案例仿真分析表明,提出方案提高了供电可靠性、避免了分布式电源机组失稳运行,具有较大的工程应用价值,已在江苏某地区电网实际投入运行。Since a large number of distributed generators access to low-voltage distribution network, the power system is easy to become an islanded and enter an instability state with low power quality. When the power supply is far less than the load demand （there is large power shortage）, it＇s the key making the island return from instability state to normal state by improving the coordination scheme of protections. Based on the allocation status of the under-frequency load-shedding device and the backup power automatic throw-in device in low-voltage distribution network, it is proposed an island self-healing scheme without extra investment for smart distribution network which is different from the traditional setting scheme for the two protective devices. Under condition of giving priority to ensuring units safety, the proposed scheme improves the prior setting scheme which can get the optimal unit safety and make distributed generators access to power grid without any loss of power supply and load. The simulation of a fault case in actual grid proves that the proposed scheme improves the reliability of power supply and avoids units＇ instability state. It has great application value in engineering, and now has been applied to Jiangsu Power Grid.

关 键 词：DG 孤岛自愈 低频减载装置 备自投装置 

分 类 号：TM77[电气工程—电力系统及自动化]