一种基于虚拟同步发电机技术的铁路供电系统

A railway power supply system based on VSG technology

针对铁路牵引负荷特性,结合新能源发电技术提出一种新的供电方案。基于电力电子器件的新能源发电技术不具备传统电力系统中占支配地位的同步发电机具有的有利于保持系统稳定运行的旋转惯性和阻尼分量。虚拟同步发电机控制技术作为一种能够使新能源发电具有与同步发电机相似特性的方法,对于提高电力系统的稳定性具有重要的支持作用。文章首先分析了铁路牵引负荷的特性,其次介绍了虚拟同步电机控制技术的概念与原理,进行同步发电机控制技术的建模,最后在电磁暂态仿真软PSCAD/EMTDC搭建一套微网系统模型,进行了基于传统和虚拟同步发电机技术的电力电子变换技术的比较,最后搭建小型实验台验证了虚拟同步发电机控制技术的先进性和对牵引网的友好性。

According to the characteristics of railway traction load,a new power supply scheme is proposed base on the new energy power production technology.The new energy generation technology based on power electronic devices does not have the rotational inertia and damping components which are beneficial to the stable operation of the system.As a method of making new energy generation have similar characteristics to synchronous generator,virtual synchronous generator control technology plays an important role in improving the stability of power system.This paper analyzes the characteristics of railway traction load,secondly introduces the concept of virtual synchronous generator control technology and principle,modeling of the control technique of synchronous generator,the last in the electromagnetic transient simulation software PSCAD/EMTDC structures,a micro network system model,the technology based on traditional and virtual synchronous generator power electronic transformation technology,At last,a small experimental platform is built to verify the advancement of virtual synchronous generator control technology and its friendliness to traction network.