直驱风电场集电线保护研究  

Novel Protection of the Power Collecting Lines in PMSG Wind Farms

作　　者：王小波[1] 宋国兵[1] 常仲学 马志宾 WANG Xiaobo SONG Guobing CHANG Zhongxue MA Zhibin(School of Electrical Engineering, Xi＇an Jiaotong University, Xi＇an 710049, China Guangzhou Power Supply Bureau Dispatch Control Center, Guangzhou 510000, China)

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]广州供电局电力调度控制中心,广州510000

出　　处：《西安交通大学学报》2017年第1期122-127,共6页Journal of Xi'an Jiaotong University

基　　金：国家重点基础研究发展计划资助项目(2012CB215105)

摘　　要：针对传统三段式电流保护应用于风电场集电线时选择性和速动性不能兼顾的问题,在分析风电场集电线拓扑结构和故障特征的基础上,结合熔断器保护曲线和风机的低电压穿越特性,提出了一种能适用于风电场集电线的反时限电流保护新方法。以直驱风电场为对象,分析得出了传统三段式电流保护不适应于风电场集电线保护的结论,并且给出了新方法的整定原则,即根据熔断器下游经不同过渡阻抗故障后集电线电流与熔断器电流的最大差值关系得到集电线反时限电流保护的理论曲线,最后借助EMTP-PSCAD软件平台搭建直驱风电场模型对理论分析进行了验证。仿真结果表明,对于风电场集电线保护,反时限电流保护新方法由于采用了连续的电流保护曲线,能够很好地与熔断器保护相配合,克服了传统三段式电流保护范围小、易造成保护越级跳闸、风机脱网等缺点,而且有很强的抗过渡电阻能力,在不同的故障条件下能快速可靠地动作,兼顾了继电保护选择性和速动性的要求,因此具有一定的工程实用价值。To enhance performance of traditional three-section overcurrent protection used in power collecting lines,a novel inverse-time overcurrent protection is proposed via analyzing the topology and faults characteristics of power collecting lines as well as the fuse protection features and PMSG＇s LVRT characteristics.Taking PMSG farm as the research object,traditional overcurrent protection is no longer applicable because it often causes small protection range,override trip and turbine tripping.The inverse-time overcurrent protection curve can be obtained according to the maximum current difference between power collecting lines and fuses.Finally the effectiveness of the novel protection is verified by simulations in EMTP-PSCAD environment.Results show that for power collecting lines,the novel protection approach overcomes the shortcomings of traditional methods and achieves better selectivity and speediness.In addition,it is insensitive to transient impedance,thus could be applied to engineering.

关 键 词：直驱风电场 集电线 三段式电流保护 熔断器 反时限电流保护 

分 类 号：TM77[电气工程—电力系统及自动化]