计及城市轨道逆变回馈装置的交直流统一供电计算

Unified AC/DC Power Supply Calculation Taking into Account Urban Rail Inverter Feedback Devices

城市轨道逆变回馈装置的供电计算对逆变回馈装置的系统设计和节能效果评估有着重要的作用。该文提出一种考虑逆变回馈装置交流侧电压波动系数和牵引变电所多状态切换的城市轨道交直流统一潮流计算算法。针对逆变回馈装置的节能效果评估,提出计及列车发车密度和全日行车计划的逆变回馈装置系统级节能效果评估指标。以某地铁工程实例为供电计算实例,在全变电所安装逆变回馈装置的情况下,牵引网压的波动得到明显改善,钢轨电位下降40.94%,当降压所负载率为0.2时,逆变回馈装置系统级节能率为8.71%,节能效果显著。

The calculation of the power supply for the urban rail inverter feedback devices plays an important role in the system design and energy-saving evaluation of the inverter feedback devices.In this paper,the algorithm of unified AC/DC power flow calculation for urban rail considering the voltage fluctuation coefficient on the AC side and the multi-state switching of the traction substations was proposed.In order to evaluate the energy-saving effect of the inverter feedback devices,the system-level energy-saving effect evaluation index of the inverter feedback devices considering the trains departure density and the full-day running plan was proposed.An instance of a subway project was used as an example of power supply calculation.In the case of full-line installation of inverter feedback devices,the fluctuation of the traction network voltage has been significantly improved,and the highest rail potential decreases by 40.94%.When the load rate of the line is 0.2,the system-level energy-saving rate of the inverter feedback system is 8.71%,and the energy saving effect is significant.