基于MMC和感应滤波的电能质量装置的研究

Research on the Power Quality Control Device with MMC and Inductive Filtering Technology

针对电气化铁路电能质量问题,本文设计了一种结合了模块化多电平技术(MMC)和感应滤波技术的设备。该设备能够补偿变压器的负序、谐波和无功电流,解决高压侧的电能质量问题,且安全可靠、控制灵活。在拓扑结构的基础上,本文对带感应滤波绕组的牵引变压器进行了建模,分析了MMC补偿系统工作原理,并推导了补偿的电流的计算方法。基于FBD算法原理,本文提出了一种使两相电路功率平衡的实时补偿电流的计算方法,并针对MMC电路的特点提出了MMC补偿系统的控制方法,最后通过仿真验证了该方案和控制方法的正确性和可行性。

This paper presents a new device, which is based on modular multilevel converter (MMC) and inductive filtering technology, can solve the electrified railway power quality problems by compensating the negative sequence, harmonics and reactive power current synchronously. Compared with others, this device has the advantages of low cost, good compensation performance and flexible control. First, this paper makes the model of traction transformer with inductive filtering winding, analyzes the working principle of MMC compensation system, and the calculation method of compensation current derivation. next, this paper presents a calculation method of real-time compensation current two-phase circuit power balance Based on the principle of FBD algorithm. then it puts forward the control method of MMC compensation system according to the characteristics of the MMC circuit. The simulation results verify the correctness and feasibility of the scheme and control method.