摘要
为了减小覆冰对电网的影响,提出了一种输电导线覆冰自动防御系统。首先介绍了该防御系统的构成及其工作原理。然后建立了相应的数学模型,采用改进的IEEE 9节点系统和实际电网算例进行了数字仿真验证,证明了该方法的可行性和有效性。最后研究推导了线路有功损耗、无功损耗和变压器无功损耗对防覆冰变压器变比变化的灵敏度公式,并分析了调压过程对电网的影响。研究结果表明,通过控制该系统投切,可降低线路的运行电压,提高线路电流,在保证电网正常工作的前提下实现输电线路的防覆冰和融冰,且对电网稳定运行的影响很小。
In order to reduce the impact of icing on a power grid,we presented a de-icing automatic defense system of transmission lines.First,we introduced the framework and principle of the system.Then,we established a mathematical model of the system,by which an improved simulation of IEEE 9 bus system and an actual grid were carried out.The simulative results verified the feasibility and effectiveness of the proposed method.Moreover,we researched and derived sensitivity formulas between active power loss of line,reactive power loss of line,reactive power loss of transformer,and ratio changes of anti-icing transformer,and analyzed the influence of regulating process on power grid operation.The results show that,by controlling the switching of the system,the proposed method can reduce the operating voltage of line,raise the current,and realize the anti-icing and ice-melting of transmission lines in operation with normal loads,without or little influence on the stable operation of power grids.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第3期698-704,共7页
High Voltage Engineering
基金
国家电网公司科技项目(SGKJJSKF[2008]449)~~
关键词
输电线覆冰
防覆冰变压器
灵敏度
线路损耗
无功损耗
变比
icing cover of transmission lines
anti-icing transformer
sensitivity
line loss
reactive power loss
ratio
