摘要
针对蒙特卡洛法计算合空线统计过电压时,要根据随机变量的分布特性抽样进行大量的仿真计算问题,介绍了实现合空线统计过电压计算的随机变量抽样、操作过电压计算、统计结果分析自动化的方法。在推导了合空线统计过电压计算的蒙特卡洛模型后在PSCAD/EMTDC软件中建立和实现了该模型,运用Multiple Run组件,按照初始合闸相角的分布特性抽样,并批量处理多个抽样算例;应用用户自定义建模功能建立统计合闸开关模型,该模型以三相触头的合闸不同期性作为服从正态分布的随机变量,用FORTRAN语言编程实现并作为组件被PSCAD/EMTDC主程序调用;由Multiple Run组件、统计合闸开关模型及系统模型(电源、线路、变压器等)组成完整了合空线统计过电压计算模型。最后应用所建立的模型对某一地区电网黑启动方案的合空线统计过电压进行了仿真,并分析了影响统计过电压的若干因素。论文所提出的方法实现了随机抽样、电磁暂态计算、给出2%统计过电压值的自动化,能够大量减少合空线统计过电压的计算工作量。
In computing statistical line-energizing over-voltage by the Monte Carlo method, a large amount of simulations have to be done according to the statistical distribution characteristics of random parameters, the simulation software can handle various cases and give out the final statistical results automatically. Based on the Multiple Run component, the user-definition model and PSCAD/EMTDC software with the powerful electromagnetic transient computation capability are presented. Using Multiple Run component, the distribution characteristic of initial closing phasor can be set as Random-Normal distribution or Random-Flat distribution automatically. Statistical breaker closing model is established using function of user-definition model. The model uses asynchronies of three-phase contactors of circuit breaker as the random parameters following normal distribution and is programmed by using Fortran language, and can be called by the main program of PSCAD/EMTDC. The cases and models have been applied to computation of black start scheme of a regional power grid, and several elements that affect over-voltage simulation results are also analyzed.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2007年第10期11-15,共5页
High Voltage Engineering
基金
华南理工大学自然科学青年基金资助项目(B05E5060710)。~~
关键词
操作过电压
合空载线路
蒙特卡洛法
统计分布
仿真
switching over-voltage
switch unloaded line
monte carlo method
statistical distribution
simulation
