考虑不确定性的电压暂降不兼容度和影响度评价指标及方法

发布时间：2018-12-29 11:41

【摘要】：随着敏感性用电设备的大量使用,电压暂降已经成为最重要的电能质量问题之一。合理、准确评估电压暂降的严重程度和电压暂降对敏感设备造成的影响,不仅能够用来衡量系统供电质量的优劣,而且也是电力市场环境下电能按质论价的前提。为合理、准确地评估电压暂降的严重性,将不确定性表示方法应用于电压暂降严重性评估中。采用云模型描述电压暂降幅值特征和设备电压耐受能力;将正态云模型的期望曲线作为隶属函数,采用模糊安全事件隶属函数方法描述设备受电压暂降影响可能出现的故障状态。建立了一种用云模型表示和计算的电压暂降不兼容度和影响度指标,以反映电压暂降的严重性和对设备造成的影响程度。用配电网电压暂降仿真模型进行仿真分析,给出了评估结果,验证了方法的可行性和合理性。
[Abstract]:With the extensive use of sensitive electrical equipment, voltage sag has become one of the most important power quality problems. It is reasonable and accurate to evaluate the severity of voltage sag and the influence of voltage sag on sensitive equipment, which can not only be used to measure the quality of power supply, but also the premise of power quality pricing in power market environment. In order to evaluate the severity of voltage sag reasonably and accurately, the uncertainty representation method is applied to evaluate the severity of voltage sag. The cloud model is used to describe the characteristics of the voltage temporary drop and the voltage tolerance of the equipment. The expected curve of normal cloud model is taken as membership function and fuzzy safety event membership function is used to describe the possible fault state of equipment affected by voltage sag. An index of incompatibility and influence degree of voltage sag expressed and calculated by cloud model is established to reflect the severity of voltage sag and the degree of influence on equipment. The simulation model of voltage sag in distribution network is used to simulate and analyze, the evaluation results are given, and the feasibility and rationality of the method are verified.
【作者单位】：电力电子节能与传动控制河北省重点实验室(燕山大学电气工程学院);国网河北省电力公司邢台供电分公司;
【基金】：国家自然科学基金资助项目(51477147)
【分类号】：TM714.2

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