大规模风电接入后电网离线分析

Off-line Analysis of Large-scale Wind Power Integration on Power System

依托DIGSILENT仿真软件,搭建双馈异步风机和永磁直驱风机仿真模型。通过建立低电压穿越功能模型,对2020年前华东电网夏季高峰运行方式,进行大规模风电接入后的短路电流计算和故障校核方式的仿真分析,用以验证风电机组的运行特性。结果表明:对于双馈风机,由于对不对称保护的特殊要求,电网不对称故障引起风电机组跳机(无低电压穿越能力)或Crowbar动作(有低电压穿越能力)的范围远大于对称故障,应采用不对称故障校核方式。对于直驱风机,直流母线越限保护动作与否,只与母线电压的降落幅度有关,仍应采用常规的对称故障校核方式。

This paper built the simulation model of Double-Fed Induction Generator and Permanent Magnet Direct-driven Wind Turbine Generator base on DIGSILENT. According to the summer peak operating Mode, we investigate the wind power operating characteristics by：the analysis of short-circuit current calculation and fault-checking mode on power system which contained large-scale wind power, the results showed that： unsymmetrical fault has a wider impact than symmetrical fault on Double-Fed Induction Generator because oF the asymmetrical protection, so it must use asymmetrical [ault-checking mode on Double-Fed Induction Generator; Otherwise, the Relay Protection of Permanent Magnet Direct-driven Wind Turbine Generator is only based on the voltage of DC bus, so it should still use symmetrical fault-checking mode on Permanent Magnet Direct-driven Wind Turbine Generator.