摘要
研究了风电场风速波动和弱馈性对距离保护算法的影响。通过在PSCAD中建立双馈式风电场并网仿真模型,对风速波动时风电场侧电网输出故障电压和电流进行FFT分析,然后结合傅里叶算法和解微分方程算法的测距原理进行仿真分析;给出矩阵束算法的测距原理,针对风电场的弱馈性,仿真分析故障电压和电流采样序列矩阵的奇异值对矩阵算法提取工频相量的影响。仿真结果表明,风电场侧电网的频偏特性使傅里叶算法的测距结果误差大,而解微分方程算法不受频率偏移的影响,测距结果能正确反映故障距离;在发生相间短路时,由于风电场的弱馈性,矩阵束算法无法提取工频相量,而接地短路受影响小,能准确提取工频相量,实现准确测距。
In this paper,the inf luence of wind farm speed f luctuat ion and weak feed characterist ics on distance pro-tection algorithm was studied. A simulation model of double-fed wind farm integration into power grid was tirstlyestablished by using the software PSCAD,and the fault voltage and current of wind fawind speed fluctuated,which was then simulated by combining the distance measurement prithm and solving dif：^erential equation algorithm. The distance measure principle of matrix pencil algorithm was giv-en. In viewoftheweak feed ofwind farm,the influence of singular value of l^ault voltage and current sampling se-quence matrix on the extracting power frequency pha^or of matrix pencil algorithm was simulated. Simulation results show that frequency offset characteristics^ fault voltage and current output from the side oranging result of Fourier algorithm large whi le that of ditferential equations algorithm can correctly reflect the fault distance. When phase-phase to ground fault occurs,matrix pencil algorithm cannot extract power frequency phasordue to theweak feed ofwind farm,whi le grounding fault is less influenced and matrix ppower frequency phasor accurately so that it can achieve accurate fault location.
出处
《山东科技大学学报（自然科学版）》
CAS
2017年第5期107-116,共10页
Journal of Shandong University of Science and Technology(Natural Science)
基金
山东科技大学研究生科技创新基金项目(YC150222)
关键词
双馈式风电场
送出线路
傅里叶算法
解微分方程算法
矩阵束算法
测距
double-fed wind farm
outgoing transmission line
Fourier algorithm
differential equations algorithm
matrix pencil algorithm
distance measure
