In response to the problems brought by the traction power supply system to the high-voltage power grid,such as negative-sequence,harmonics and reactive power,a novel integrated compensation system for electrified railway pow-er quality is proposed based on Y/>▽balanced transformer.The system makes full use of the trian gular winding tap on the secondary side of the Y/>▽balanced transformer,and directly connects the traditional back-to-back railway power flow controller with the tap.On the one hand,a single-phase coupling transformer can be saved,which makes the sys-tem have an obvious advantage in the cost of investment;on the other hand,the integration degree of the whole system can be improved,thus reducing the cover area of the equipment.In this paper,the structure and characteristics of the system are introduced firstly,and the compensation principle is discussed in detail.Then,a method is given to detect and control the system.Finally,a system simulation model is built by using Matlab/Simulink.Simulation result verifies the compensation performance of the system from the aspects of negative-sequence,harmonics and reactive power.%为解决牵引供电系统给高压电网带来的负序、谐波及无功问题,提出了一种基于Y/>▽平衡变压器的新型电铁电能质量综合补偿系统.该系统充分利用Y/>▽平衡变压器二次侧三角形绕组所带的抽头,将传统背靠背铁路潮流控制器的一端直接与该抽头相连,一方面可以节省1台单相耦合变压器,使该系统在投资成本上具有明显的优势;另一方面也提高了整个系统的集成度,减小了装置的占地面积.文中首先介绍了该系统结构及特性,并对补偿原理进行了详细的讨论,然后给出了该系统的检测及控制方法,最后应用Matlab/Simulink软件搭建了系统仿真模型.仿真结果验证了本系统的负序、谐波及无功补偿性能.
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