适用于风电接入系统的时域模型识别纵联保护新原理  

Novel Pilot Protection Based on Time-Domain Model Identification for Wind Power Integration

作　　者：宋国兵[1] 王晨清[1] 唐吉斯[1] 王小波[1] 郭润生 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]朔州供电分公司,山西省朔州市036002

出　　处：《电网技术》2016年第11期3580-3585,共6页Power System Technology

基　　金：国家重点基础研究发展计划项目(973计划)(2012CB215105)~~

摘　　要：为适应风电系统弱馈、高谐波、频率偏移等故障特征,提出一种基于时域模型识别的纵联保护新原理。根据线路两端差动电压电流在区外故障时符合电容模型、区内故障时不符合电容模型的特点,利用相关系数对电容模型进行描述,若由差动电压电流计算得到的电容模型符合度接近于1则判为区外故障,否则判为区内故障,并给出了保护判据。该保护判据在时域中实现;不受风电系统弱馈、高谐波、频率偏移等特征的影响,采用故障全量,不受风电系统阻抗不稳定的影响。利用PSCAD建立了风电接入系统模型,仿真验证了所提原理的有效性。To adapt to fault characteristics of week infeed, rich harmonics and frequency deviation of wind power system, a novel pilot protection principle based on model recognition in time-domain is proposed in this paper. Differential voltage and current of two line terminals conform to capacitance model at external fault state, but do not conform at internal fault state. A correlation coefficient is defined to describe capacitance model. When the correlation coefficient is close to 1, the fault is external, otherwise is internal. Thus protection criterion is formed. Since the criterion is achieved in time-domain, the novel pilot protection is not impacted by fault characteristics of week infeed, large harmonic and frequency deviation of wind power system. Since full electrical quantities are adopted, the proposed scheme is free from unstable impedance influence of wind power system. PSCAD simulation of wind power integration verifies effectiveness of the proposed principle. 1

关 键 词：风电系统 纵联保护 模型识别 时域 相关系数 

分 类 号：TM77[电气工程—电力系统及自动化]