基于柔性直流并网风电场的故障穿越策略述  

Fault Ride-through Strategies for the Connection of Large-scale Wind Farm based VSC-HVDC

作　　者：李丹[1] 刘洪波[1] 蔡婷婷[1] Li Dan;Liu Hongbo;Cai Tingting(Electrical Engineering College,Northeast Electric Power University,Jilin Jilin 132012)

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《东北电力大学学报》2018年第6期13-20,共8页Journal of Northeast Electric Power University

基　　金：国家自然科学基金(51261130471)

摘　　要：大规模风电场采用柔性直流输电系统(VSC-HVDC)并网已成为研究热点.当电网侧交流系统发生故障时,引起直流输电环节的功率输入、输出发生功率差额,从而导致直流电压升高,严重时会造成直流系统退出运行、风电机组脱网等严重后果,因此研究风电经柔性直流输电并网的故障穿越显得尤为重要.快速减少直流输电环节的功率差额,可以降低直流系统退出的风险,从而提高故障穿越的能力.具体实现方式包括快速降低风电场功率、应用卸荷电路和其他协同控制策略.首先回顾了这一领域的研究现状,并对其主要的控制策略进行了分析对比,最后提出将泄能电阻与减少风电场输出功率结合是未来解决这一问题的有效手段.High voltage direct current based on Voltage Source Converter （VSC-HVDC） has become the mainoption for the large scale wind farm integration. Once the faults occur in AC grid side the difference of electri-cal power between two side of the HVDC transmission system will emerge which will led to the voltage of DCtransmission system arised. Even cause the DC system broke down and wind farm disconnected from the maingrid. Therefore it is important to study on the fault ride-through strategies for the connection of large-scale windfarm via VSC-HVDC. The main methodology is to decrease the difference between the input and output electri-cal power in the two side of HVDC-VSC transmission system in order to realize the capability of fault ridethrough. These methods includes fast reduction of the wind power output,application of braking resistor and thecooperative control strategies. The review of the current research in this field is presented in this paper. then o-verview and compare the main control methods among it. Finally it is put forward that the integration of brakingresistor and limit wind farm power output is one of the major means to solve the FRT issue.

关 键 词：风电 柔性直流输电 故障穿越 

分 类 号：TM614[电气工程—电力系统及自动化]