直驱风机风电场与交流电网相互作用引发次同步振荡的机理与特性分析

发布时间：2018-05-20 22:44

本文选题：直驱风机 + 弱交流系统　；参考：《中国电机工程学报》2016年09期

【摘要】：近年来,国内许多地区的直驱风机风电场在附近电网没有串补的情况下出现了持续的次同步频率范围的功率振荡。为深入研究该问题,该文建立典型直驱风机风电场接入交流电网的等值系统模型,通过电磁暂态仿真、阻抗模型和小信号分析研究次同步振荡产生的机理;分析接入交流电网强弱、风机出力、并网风机台数、风机控制参数及动态无功补偿设备对振荡特性的影响;结果表明,多台直驱风机通过弱交流系统并网时会出现次同步振荡模态,直驱风机在该振荡模态频率上表现为"具有小值负电阻的容性阻抗",与交流电网的电感构成谐振回路,并因负电阻效应而导致危险的功率振荡现象。最后,讨论了这种次同步振荡问题的潜在危害及其防范措施。
[Abstract]:In recent years, in many areas of China, the power oscillation of sub-synchronous frequency range has been observed in the wind farm of direct-drive fan in the vicinity of power grid without series compensation. In order to study this problem deeply, the equivalent system model of typical direct drive fan wind farm connected to AC power network is established, and the mechanism of sub-synchronous oscillation is studied by electromagnetic transient simulation, impedance model and small signal analysis. The influence of the strength of the connected AC power grid, the output force of the fan, the number of the fan connected to the grid, the control parameters of the fan and the dynamic reactive power compensation equipment on the oscillation characteristics are analyzed. When several direct-drive fans connect to grid through weak AC system, the sub-synchronous oscillation mode will appear. The frequency of direct-drive fan is "capacitive impedance with small negative resistance", which forms the resonant circuit with the inductance of AC power network. And the phenomenon of dangerous power oscillation is caused by the negative resistance effect. Finally, the potential harm of this sub-synchronous oscillation problem and its preventive measures are discussed.
【作者单位】：电力系统及发电设备控制与仿真国家重点实验室(清华大学电机系);国家电力调度控制中心;金风科技股份有限公司;
【基金】：国家自然科学基金项目(51322701) 国家电网公司科技项目(SGXJ0000KXJS1500669)~~
【分类号】：TM712

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