基于钒电池?超级电容混合储能技术的永磁同步风电机组低电压穿越能力提升研究  

Enhancement of Low Voltage Ride Through Ability of Permanent Magnet Synchronous Wind Power Generation Sets Based on Hybrid Energy Storage System Composed of Vanadium Redox Battery and Super Capacitor

作　　者：任永峰[1] 彭伟[1] 刘海涛[2] 薛宇 周杰 安中全[2] 

机构地区：[1]内蒙古工业大学电力学院,内蒙古自治区呼和浩特市010080 [2]内蒙古电力科学研究院,内蒙古自治区呼和浩特市010020 [3]北京天润新能投资有限公司,北京市朝阳区100022 [4]北京天源科创风电技术有限责任公司,北京市大兴区100176

出　　处：《电网技术》2014年第11期3016-3023,共8页Power System Technology

基　　金：国家自然科学基金项目(51367012);新世纪优秀人才支持计划项目(NCET-11-1018);内蒙古自然科学博士基金项目(2011BS0903)~~

摘　　要：以基于双三电平变流器的2 MW直驱式永磁同步风力机组低电压穿越为研究对象,机侧变流器采用最大转矩电流比控制,对网侧变流器提出了新颖的稳态时单位功率因数控制、电网暂态故障时无功优先、有功受限协调控制策略。对全钒液流电池和超级电容进行等效电路模型分析,采用双向DC/DC变换电路作为混合储能系统和风力机组直流母线的接口,并定量模拟电网电压单相、三相深度跌落,对机组采用直流母线卸荷电路、改进控制策略以及混合储能方式实现低电压穿越进行了对比仿真。研究结果很好地说明:上述3种方案在严重的电网电压跌落情况下均可实现风电机组低电压穿越,钒电池?超级电容混合储能方式可以更好地提升机组低电压穿越能力,并加速系统有功恢复过程。The low voltage ride through（LVRT） of dual tri-level converter based direct-driven permanent magnet synchronous wind power generation set with rated capacity of 2MW is taken as the research object.The converter at the generator side is controlled by dual closed-loop based maximum peak torque to current ratio,and for the converter at the grid side a novel control strategy,in which the unity power factor control is applied during steady state and the coordinated control of reactive power prioritized with active power restricted is applied during grid transient fault,is put forward.The analysis on equivalent models of vanadium redox battery（VRB） and super capacitor are performed,and taking dual-directional DC/DC conversion circuit as the interface for the hybrid energy storage system and the DC bus of wind power generation unit the symmetrical and unsymmetrical deep voltage sags are quantitatively simulated,and the contrastive simulation of the implementation of LVRT ability of generation units by adopting the DC bus unloading circuit,the improved control strategies and the hybrid energy storage system respectively is carried out.Results of this research show that using above-mentioned three schemes the LVRT of direct-driven permanent magnet synchronous wind power generation units can be implemented when serious grid voltage sag occurs,and using the hybrid energy storage pattern composed of VRB and super capacitor the LVRT of generation sets can be enhanced better and the active power recovery process of power grid can be accelerated.

关 键 词：混合储能 永磁同步发电机 低电压穿越 控制 风力发电 

分 类 号：TM614[电气工程—电力系统及自动化] TM743