基于STATCOM的双馈风力发电机低电压穿越能力分析

STATCOM-based Analysis of Low-voltage Ride-through Capability ofDoubly Fed Induction Generator Wind Turbines

为了对风电场低电压穿越(Low-Voltage Ride-Through, LVRT)动态响应特性及其治理措施进行研究,建立了双馈感应发电机(Doubly Fed Induction Generator, DFIG)风电场仿真模型,讨论了DFIG网侧和转子侧变流器控制策略,并从风机机端电压、风机直流母线电压等关键方面分析了静止同步补偿器(Static Synchronous Compensator, STATCOM)在风电场低电压穿越防治中的应用有效性。分析结果表明,采用STATCOM可以显著改善风机在低电压情况的响应特性,同时STATCOM可以提供动态无功功率补偿,减轻电网低电压对风机的不利影响,有助于风机提供稳定发电能力,减少风电场停机时间和电网扰动。

In order to study the dynamic response characteristics and control measures of low-voltage ride-through(LVRT)in wind farms,this paper establishes a simulation model of the most widely used doubly fed induction generator(DFIG)wind farm.The control strategies of DFIG grid-side and rotor-side converters are discussed.When studying the dynamic response characteristics of wind turbines under low voltage conditions,the effectiveness of static synchronous compensator(STATCOM)in improving LVRT characteristics of wind turbines is analyzed.Results show that the use of STATCOM can significantly improve the response characteristics of wind turbines under low voltage conditions.At the same time,STATCOM can provide dynamic reactive power compensation,alleviate the adverse effects of low voltage on wind turbines,help wind turbines provide stable power generation capacity,reduce wind farm downtime,and mitigate grid disturbances.