基于储能型DVR双馈风电机组高电压穿越技术研究

High Voltage Ride-through of Doubly Fed Induction Wind Generators Using Energy-based DVR

在通过对风电机组高电压穿越技术概念的理解及以往出现因高电压而导致大规模风电机组脱网事故的研究分析的前提下,提出了一种在等效超级大电容(Super-capacitor,SC)储能的基础上配合动态电压补偿器(DVR)实现双馈风电机组高电压穿越的方案。在电网电压骤升的情况下,基于储能型动态电压补偿器系统能对风电机组机端电压进行完全补偿,使得风电机组机端电压始终维持在正常运行水平而持续工作不脱网,同时系统输出有功功率以确保电网吸收的有功功率和DFIG输出的有功功率间的平衡。在MATLAB/Simulink仿真平台上搭建仿真模型并进行仿真,结果表明所提出基于储能型动态电压补偿器风电机组高电压穿越技术方案的具有可行性。

A high voltage ride-through scheme of Doubly Fed Induction Wind Generator （DFIG） based on super-capacitor- based Dynamic Voltage Restorer （DVR） is proposed by understanding the concept of high voltage ride-through and analyzing large-scaled off-grid events. In order to maintain generator terminal voltage at normal level, the DFIG stator voltage is fully compensated by super-capacitor-based DVR under the condition of grid voltage swells, and meanwhile, the output power of super-capacitor-based DVR system will maintain the balance of grid-absorbed power and DFIG output power. A simulation model is established in MATLAB/Simulink, and the analysis results prove the effectiveness of proposed method.