电压波动与闪变对架空线路能效影响分析

Analysis of influence of voltage fluctuation and flicker on energy efficiency of overhead lines

中文关键词: 架空线  能效  间谐波  电压波动与闪变  幅值波动  频率波动  附加损耗  最小二乘法  多项式曲面拟合

英文关键词: overhead line  efficiency  interharmonics  voltage fluctuation and flicker  amplitude fluctuation  frequency fluctuation  additional loss  least squares method  polynomial surface fitting

中文摘要:

      为探讨架空线路在电压波动与闪变影响下的附加损耗，本文以LGJ-120/20型号的架空线为例，利用短线路模型，定性分析了架空线路各项损耗，在电压波动与闪变的国标规定范围内，设定波动幅值及波动频率步长，进行实验仿真，仿真结果表明：架空线路附加损耗与频率波动的一次方呈正相关，与幅值波动的一次方及三次方呈负相关，与幅值波动的二次方呈正相关，且正比于频率波动与幅值波动的乘积。最后给出了通过最小二乘多项式拟合技术计算线路损耗的方法，并运用Simulink模型验证其有效性。

英文摘要:

      To explore the energy efficiency of overhead lines under the influence of voltage fluctuations and flicker, this paper takes the overhead line of LGJ-120/20 model as an example, and uses the short line model to qualitatively analyze the various losses of overhead lines in voltage fluctuation and flicker. Within the scope of the national standard, the fluctuation amplitude and the fluctuating frequency step are set, and the simulation is carried out. The simulation results show that the additional loss of the overhead line is positively correlated with the primary of the frequency fluctuation, and negatively correlated with the primary and cubic of the amplitude fluctuation. The ratio is proportional to the square of the amplitude fluctuation and is proportional to the product of the frequency fluctuation and the amplitude fluctuation. Finally, the method of calculating line loss by least squares polynomial fitting technique is given, and the effectiveness is verified by Simulink model.