基于虚拟同步发电机技术的改进型背靠背起动方法  

A Modified Back-to-Back Starting Method Based on Virtual Synchronous Generator Technology

作　　者：陶亮[1] 孙建军[1] 查晓明[1] 宫金武[1] Tao Liang;Sun Jianjun;Zha Xiaoming;Gong Jinwu(School of Electrical Engineering and Automation Wuhan University,Wuhan 430072 China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072

出　　处：《电工技术学报》2020年第S02期413-420,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51637007,51777145)。

摘　　要：背靠背起动作为一种传统的大容量同步电机起动方式,需要两台额外的物理电机提供支持,而且操作和调节过程也相当复杂。针对这一问题,该文通过采用虚拟同步发电机(VSG)技术,提出一种改进型大容量同步电机背靠背起动方法,用控制成VSG的级联H桥变换器(CHB)替换原动机和同步发电机。新的起动系统不仅解决了原系统存在的问题,而且转子初始相对位置角、VSG的阻尼转矩都变为可调项,新增的无速度传感器转速闭环控制也使得对同步电机速度的控制更加精准。此外,该文研究了在计及系统稳定性时提高机械转矩增长速率和减缓阻尼转矩增长速率来加快起动过程的可行性,并通过硬件在环实验验证了所提改进型背靠背起动方法的有效性。Back-to-back starting is a traditional starting method for large-capacity synchronous motors,but it needs two additional physical machines,and the operation process is quite complex.In order to solve this problem,a modified back-to-back starting approach for large-capacity synchronous motors based on virtual synchronous generator(VSG)technology is proposed in this paper.The cascaded H-bridge converter(CHB)controlled as a VSG is used to replace the prime mover and synchronous generator of conventional system.In the new starting system,the problems of original system are solved,and the initial relative angle between the machines and the damping torque of VSG become controllable.Furthermore,the added sensorless speed controller makes the speed controlled more accurate.The feasibility of promoting the growth of mechanical torque or retarding the growth of damping torque to accelerate the starting process is also studied when considering the system stability.The effectiveness of the proposed modified back-to-back starting method is verified by the hardwarein-loop experimental results.

关 键 词：背靠背起动 虚拟同步发电机 大容量同步电机 硬件在环 

分 类 号：TM341[电气工程—电机]