含动态直流泄能电阻的MMC-HVDC提高风电场低电压穿越能力研究

发布时间：2018-04-08 20:07

本文选题：动态直流泄能电阻　切入点：模块化多电平换流器　出处：《电网技术》2014年05期

【摘要】：提出了基于动态直流泄能电阻的模块化多电平柔性输电直流方案,以提高基于感应双馈电机风电场的低电压穿越能力。基于矢量控制及无源电压跟随控制分别设计了系统侧、风场侧柔性直流换流器在风电场稳态运行时的控制策略。当交流系统故障导致电压跌落时,详细分析了动态直流泄能电阻的工作原理、动作判据及导通持续时间,以实现风电场低电压穿越;同时研究了其与系统侧模块化多电平换流器在故障清除后电压恢复期的协调控制,以快速恢复风电场有功输出能力。仿真结果表明:当交流系统故障时,含动态直流泄能电阻的柔性直流输电系统能够维持直流电压且不改变风电场输出电压电流;当故障清除后,风电场输出功率恢复速率远大于电力系统行业标准相关技术指标。
[Abstract]:A modularized multilevel flexible DC transmission scheme based on dynamic DC drain resistor is proposed to improve the low voltage traversing capability based on induction doubly-fed wind farm.Based on vector control and passive voltage following control, the control strategies of flexible DC converter on the side of the system and the side of the wind field are designed respectively during the steady operation of the wind farm.When the voltage drop is caused by the fault of AC system, the working principle, the action criterion and the on-on duration of the dynamic DC energy leakage resistance are analyzed in detail in order to realize the low voltage traversing of the wind farm.At the same time, the coordinated control with the modularized multilevel converter on the system side during the voltage recovery period after the fault clearing is studied in order to recover the active power output ability of the wind farm quickly.The simulation results show that the flexible DC transmission system with dynamic DC energy leakage resistor can maintain DC voltage without changing the output voltage and current of wind farm when the AC system fails, and when the fault is cleared,The recovery rate of wind farm output power is much higher than that of power system industry standard.
【作者单位】：华中科技大学电气与电子工程学院;国网智能电网研究院;
【基金】：国家自然科学基金项目(51261130471)~~
【分类号】：TM614

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