电压暂降特性及其对敏感设备影响评估研究

发布时间：2018-05-14 20:15

本文选题：电压暂降 + 敏感设备　；参考：《华北电力大学》2014年硕士论文

【摘要】：本论文针对电压暂降特性及其对敏感设备影响评估问题进行研究。为更透彻地认识电压暂降这一现象,基于对我国多个地区电能质量监测系统记录的大量电压暂降事件的分析,给出了更为广泛、切合实际的电压暂降分类,并对暂降特征进行了分析；研究了可表征电压暂降发生前、暂降后、暂降期间与过渡期间等阶段的波形特征的特征量,结合实测波形进行了统计分析,给出了电压暂降幅值、持续时间、暂降频次、暂降起始点、相位跳变5个特征量的分布特征、范围,并研究了相位跳变的传播特性。针对传统方法对电压暂降过度评估问题,结合设备电压敏感曲线提出了采用多暂降阈值和持续时间的电压暂降新型描述方法,并在此基础上提出了针对设备敏感性评估的单个事件、站点评估方法,给出了站点暂降描述图的概念,可与设备电压免疫曲线方便的结合起来,评估设备因暂降发生故障的频次与频次区间；提出了基于新型描述方法的电压暂降严重程度综合指标,较好解决了传统方法存在的过度评估与不精确问题。最后运用所提出的评估方法对PLC、 ASD、AC Relay、PC四类典型敏感设备电压暂降免疫能力进行评估,并与传统方法所得结果进行了对比分析,验证了文中所分析的传统方法过度评估的缺点,以及采用本文方法进行设备电压暂降免疫能力评估的可行性。
[Abstract]:In this paper, the characteristics of voltage sag and its impact on sensitive equipment are studied. In order to understand the voltage sag more thoroughly, based on the analysis of a large number of voltage sag events recorded by the power quality monitoring system in many regions of China, a more extensive and practical classification of voltage sag is given. The characteristics of the voltage sag before, after, during and during the transient period are studied, and the statistical analysis of the measured waveform is carried out, and the voltage temporary drop value is given, which can be used to characterize the waveform characteristics of the voltage sag before, after, during, and during the transition period, and the statistical analysis is carried out on the basis of the statistical analysis of the measured waveform. The distribution and range of five characteristic variables, such as duration, frequency, starting point and phase jump, are studied. The propagation characteristics of phase jump are also studied. Aiming at the problem of overevaluation of voltage sag by traditional methods, a new description method of voltage sag based on multi-sags threshold and duration is proposed in combination with the voltage sensitive curve of equipment. On this basis, a single event and site evaluation method for device sensitivity evaluation are proposed, and the concept of station transient description diagram is given, which can be easily combined with the voltage and immune curve of the equipment. The frequency and frequency range of equipment fault due to transient drop are evaluated, and the comprehensive index of voltage sag severity based on new description method is proposed, which solves the problem of over-evaluation and inaccuracy in traditional methods. Finally, the proposed evaluation method is used to evaluate the immune ability of four typical sensitive devices, PLC, ASDX AC Relay-PC, and the results are compared with those obtained by the traditional methods. The shortcomings of the traditional methods are verified. And the feasibility of using this method to evaluate the immune ability of equipment voltage sag.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM712

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