基于电压相量的直驱风电场联络线单相自适应接地距离保护

发布时间：2018-05-18 14:51

本文选题：直驱风电场联络线 + 自适应距离保护　；参考：《电网技术》2017年05期

【摘要】：针对过渡电阻造成阻抗测量不准确引起风电场联络线单相接地距离保护拒动或超越的问题,分析了双电源系统电压相量平面特性。在此基础上,基于故障点与保护安装处的序电流关系,结合风电场侧的零序阻抗特点,建立了测量电压与故障点电压相位关系的表达式。根据故障点电压和整定电压的相位特性,考虑双馈风电机组的频率偏移特性,提出了直驱风电场联络线单相自适应接地距离保护方案,并对其动作性能进行了仿真验证。大量仿真结果表明,该保护方案判别原理简单可靠,有较强的耐受过渡电阻能力,不受风电场侧运行工况多变的影响,能够准确判别区内及区外故障。
[Abstract]:Aiming at the problem that the impedance measurement is not accurate caused by the transient resistance, the single-phase grounding distance protection of wind farm tie-line is refused or overstepped, the characteristics of voltage phasor plane of dual-power system are analyzed. On this basis, based on the relationship between the fault point and the sequence current of the protection installation, combined with the characteristics of zero sequence impedance of the wind farm side, the expression of the phase relationship between the measurement voltage and the fault point voltage is established. According to the phase characteristics of fault point voltage and setting voltage, considering the frequency offset characteristics of doubly-fed wind turbine, a single-phase adaptive earthing distance protection scheme for tie-line of direct-drive wind farm is proposed, and its performance is verified by simulation. A large number of simulation results show that the protection scheme is simple and reliable in principle, has strong ability to withstand the transition resistance, and is not affected by the changeable operating conditions of the side of the wind farm, and can accurately distinguish the faults in and out of the area.
【作者单位】：可再生能源发电与并网技术教育部工程研究中心(新疆大学);甘肃省电力公司风电技术中心;
【基金】：国家自然科学基金资助项目(51267019,51467019)~~
【分类号】：TM773;TM614

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