电压源型全控器件励磁控制策略  

Control Strategy of Voltage Source Converter Excitation System Based on Full Controlled Devices

作　　者：何金平[1] 毛承雄[1] 陆继明[1] 王丹[1] 杨嘉伟[1] 

机构地区：[1]华中科技大学湖北省电力安全与高效利用重点实验室,武汉430074

出　　处：《电工技术学报》2012年第12期240-247,263,共9页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973项目)(2009CB21-9702);国家自然科学基金重点项目(50837003);国家自然科学基金(50977035)资助项目

摘　　要：全控器件励磁系统不仅能实现常规励磁系统的功能,还能通过在网侧补偿无功,为发电机提供更多的阻尼,提高系统稳定性。本文首先分析了全控励磁系统的基本运行原理,从理论上推导了机端注入无功电流对发电机系统等效阻尼系数的影响,研究表明,通过合理的补偿无功电流,将会提高系统的阻尼,同时系统阻尼的改善受无功补充容量、系统参数及系统运行点的影响。根据理论分析,设计了基于电压源型的VSC串DC/DC变换器的全控励磁系统的控制策略,仿真分析表明这种电压源型全控器件励磁系统能够提供更多的阻尼,提高系统稳定性,并且随着补偿容量的增大,阻尼效果越明显。Excitation system based on full controlled devices converter has not only the ability of ordinary excitation system but can also supply more damping to the synchronous generator and increase the stability of power system through injecting reactive current to the grid.This paper first analyzes the basics principle of excitation system based on full controlled,and deduced the theory how the injected reactive current in the terminal affects the damping of the system.The research shows that after injecting proper recative current will finally increse the system＇s damping and the effect is mainly depended on the capacity of the compensation system and the parameters of and the openation condition of the current system.This paper also designs the control strategy of voltage source converter excitation system based on full controlled devices,using three phase full bridge PWM converter as exciter.The simulation results show that,this kind of voltage source converter excitation system can supply more damping to system through another way,and also increase the stability of the generator.The larger capacity of the compensation system,the more damping there will be.

关 键 词：同步发电机 阻尼 全控励磁 电压源型 

分 类 号：TM712[电气工程—电力系统及自动化]