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高压架空输电线路工频正序参数测量方法仿真
白日昶1, 帅玲玲1, 张承学2, 李海涛2, 孙元博2
1.江西省电力公司 超高压分公司,江西 南昌 330096;2.武汉大学 电气工程学院,湖北 武汉 430072
摘要:
对架空输电线路的工频正序参数测量方法进行了分析比较。根据架空输电线路长度的不同对其相应的等值电路进行了相关理论分析,并根据基于数字法测量原理进行了计算推导,选出与频率相关的相域模型作为高压架空输电线路模型。构建出基于PSCAD软件平台的仿真模型,利用PSCAD对模型进行仿真,比较不同工频正序参数测量方案的仿真结果。针对是否采集输电线路末端电流的2种情况分别计算了模型的正序阻抗,对计算结果与理论值的偏差进行分析得出了不同测量方法的适用范围:输电线路长度小于100 km时,可以仅采集线路首端电压和电流量,计算结果能够满足工程要求;输电线路长度大于100 km时,应同时采集线路末端电流量,所得结果比较精确。
关键词:  架空输电线路  工频参数测量  PSCAD  相域模型  误差分析
DOI:
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基金项目:江西省电力公司科技项目(2009050901)
Simulation of power-frequency positive-sequence parameter measurementfor high-voltage overhead transmission line
BAI Richang1, SHUAI Lingling1, ZHANG Chengxue2, LI Haitao2, SUN Yuanbo2
1.Jiangxi Electric Power Co.,Extra High Voltage Branch,Nanchang 330096,China;2.School of Electrical Engineering,Wuhan University,Wuhan 430072,China
Abstract:
Different power-frequency positive-sequence parameter measurements for transmission lines are compared. The equivalent circuit of transmission line is analyzed theoretically according to its different lengths,its parameters are calculated based on the digital parameter measurement,and the frequency-related phase model is selected as the transmission line model. The simulation model is constructed based on PSCAD software platform and the simulative results for different power-frequency positive-sequence parameter measurements are compared. The positive-sequence impedance is calculated for two conditions:with and without the line-end current. The difference between calculated and theoretical values is analyzed and the conclusion is that:when the length of transmission line is shorter than 100 km,the value calculated only with the line-head voltage and current may meet the practical requirements;when the length is longer than 100 km,the line-end current should be acquired to get more accurate result.
Key words:  overhead transmission line  power-frequency parameter measurement  PSCAD  phase model  error analysis

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