基于地铁综合监控的动态无功平衡控制研究

Research on dynamic reactive power balance control based on comprehensive metro monitoring

地铁动力及照明负荷涉及多个用电系统,每个用电系统内容不同,开启时间不定,其功率因数也不相同,电能质量很难控制。基于部分地铁供电系统公共连接点(PCC)功率因数小于0.9的现象,通过对地铁供电系统组成及负荷构成分析,对无功功率的产生、补偿容量及补偿方式的研究,广州地铁10号线结合电能质量测量数据,制定相应的治理方案。运用基于综合监控的网络化动态平衡控制进行双向补偿,实现系统呈容性时补偿感性无功,系统呈感性时补偿容性无功,确保系统不出现过补偿。运行结果证明,该方法可在消除谐波、避免谐振风险以及改善电能质量的同时,提高地铁系统的运行稳定性,保障各用电系统、电子设备、仪器仪表的正常安全运转。该方案可对同类工程实践起到参考作用。

Based on the phenomenon that the power factor of the public connection point(PCC)of certain urban rail transit power supply systems is less than 0.9,by analyzing and researching the generation of reactive power,compensation capacity,and compensation methods,Guangzhou metro line 10 utilizes networked dynamic balance control methods based on integrated monitoring for bidirectional compensation.In doing so,it compensates for inductive reactive power when the system is capacitive and compensation for capacitive reactive power when the system is inductive,thus ensuring that the system does not overcompensate.The results of this operation prove that this method not only eliminates harmonics,avoids resonance risks,and improves power quality,but also improves the operational stability of the metro system.This serves as a useful reference for similar engineering processes.