集群风电接入对汇集站三绕组主变压器保护的影响及对策

摘要

Aiming at the problem that traditional transformer protection is difficult to operate reliably in the clusterof wind power system, thispaper takes RCS-978 series transformer protection device as an example, making a further analysis and research on its adaptability in the cluster of wind farm. The electromagnetic transient model of double-fed wind farm and three winding transformer protection in collection station is built on the PSCAD/EMTDC platform, simulating output characteristics of wind turbine under the fault of main transformer station and its effect on transformer longitudinal differential protection. Based on the above model, this paper proceed from the setting of longitudinal differential protection perspective, simulating the movement characteristics of transformer protection under different setting conditions, and then put forward a reasonable solution.%针对常规变压器在集群风电系统中继电保护不可靠的问题,文章在PSCAD/EMTDC仿真平台上,以RCS-978系列变压器保护装置为例,建立双馈集群风电场及汇集站三绕组主变压器保护的电磁暂态模型.当汇集站主变故障时,仿真分析了风电机组的频率偏移特性及其对主变纵差保护的影响,并从纵差保护的整定入手,研究了不同整定条件下主变压器纵联差动保护的特性.最后提出合理的变压器保护配置方案.