复合型FCL改善风火打捆系统暂态稳定性研究  

Study on improving transient stability of wind-thermal baling system with compound FCL

作　　者：石帅 SHI Shuai(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电气应用》2024年第1期32-42,共11页Electrotechnical Application

基　　金：国家自然科学基金项目(52277170)。

摘　　要：为改善风火打捆系统的暂态稳定性,提出将具有串补功能的复合型故障限流器(Fault Current Limiter,FCL)接入到风火打捆系统中。将双馈风电机组(Doubly-Fed Induction Generator,DFIG)对系统的影响用等效外特性参数表示,在分析DFIG接入系统对暂态稳定的影响和复合型FCL工作原理的基础上,分析带复合型FCL的风火打捆系统的功率特性方程,通过分析在不同运行状态下复合型FCL对功率特性方程中输入阻抗、转移阻抗的影响,确定其对传输功率极限的作用,分析其提高暂态稳定性的机理。制定了故障发生前、中、后不同阶段,复合型FCL提高风火打捆系统暂态稳定性的控制策略。正常运行及故障切除后发挥复合型FCL的串补功能;故障状态下通过确定目标功率差与触发角之间的关系,通过控制限流电抗,发挥FCL限制短路电流、提高母线电压的作用,达到提高功率输送能力,改善暂态稳定性的目的。仿真分析表明机理分析和所提控制策略的有效性。In order to improve the transient stability of the wind fire baling system,a fault current limiter(FCL)with series compensation function is introduced into the wind fire baling system.The influence of doubly fed wind turbine DFIG(doubly fed induction generator)on the system is expressed by equivalent external characteristic parameters.Based on the analysis of the influence of DFIG on the transient stability and the working principle of compound FCL,the power characteristic equation of the wind-thermal baling system with compound FCL is analyzed.By analyzing the influence of compound FCL on the input impedance and transfer impedance in the power characteristic equation under different operating conditions,the effect of FCL on the transmission power limit is determined,and the mechanism of improving the transient stability is analyzed.The control strategy of compound FCL to improve the transient stability of the air-fire baling system is developed at different stages before,during and after the fault occurs.After normal operation and fault removal,the series complement function of compound FCL can be played.By determining the relationship between the target power difference and the trigger Angle,and controlling the current limiting reactance,FCL can limit the short circuit current and improve the bus voltage,so as to improve the power transmission capacity and transient stability.Simulation analysis shows the effectiveness of mechanism analysis and proposed control strategy.

关 键 词：风火打捆系统 风电等值 复合型FCL 暂态稳定性 

分 类 号：TM712[电气工程—电力系统及自动化] TM61