光伏接入牵引供电系统对电能质量的影响

Influence of PV generation system accessing to traction power supply system on power quality

提出将光伏系统作为牵引负荷电源之一,与电力系统共同给牵引负荷供电的方案。光伏系统在27.5k V侧接入牵引供电系统,分析牵引负荷特性和光伏系统输出特性,推导计算光伏系统接入前、后对电力系统侧电能质量的影响;针对不同工况对光伏接入后电能质量的影响进行仿真分析,基于实测负荷数据对光伏系统接入前、后电能质量的影响进行验证。结果表明:所研究的光伏接入方案对电力系统侧三相电压不平衡度不产生影响,对三相谐波畸变率以及功率因数的影响与接入光伏系统的大小有关。

A traction load power supply scheme is proposed, in which the PV （PhotoVohaic） generation system is used as one of the power sources to supply power together with power system. The PV generation system is accessed into the traction power supply system at 27.5 kV side. The characteristics of traction loads and PV output are analyzed,and the influence of the PV generation system access on power quality is derived. The influences of PV generation system on power quality in different working conditions are simulated, which are verified by the practical load data. Simulative results show that the studied PV access scheme has no influence on three-phase voltage unbalance factor of the power system, and the influences on three-phase harmonic distortion rate and power factor is related to the capacity of the accessed PV system.