基于圆形度指标的电能质量综合评估方法  

Comprehensive evaluation method of power quality based on circular degree indicators

作　　者：周勇[1] 伍小兵[2] 熊龙珠 李树奎 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410004 [2]广西电网公司梧州供电局,广西梧州543002 [3]国网张家界供电公司,湖南张家界427000 [4]国网宁夏石嘴山供电公司,宁夏石嘴山753000

出　　处：《电力系统保护与控制》2014年第13期28-38,共11页Power System Protection and Control

摘　　要：就电能质量问题分别建立了数学模型或物理模型，以方便对电能质量问题进行研究。在叙述了实际电量与理想电量贴近度分析的理论基础上，引入了傅立叶级数法对贴近度进行数学描述，解释了αβ两相合成曲线的实际意义。提出了用圆形度量化稳态电能质量指标的方法，通过绘出单独的电能质量问题对应的αβ两相合成曲线，计算其圆形度可验证该理论的合理性。对实测数据进行分析，分别计算圆形度、谐波总畸变率，绘出αβ两相合成曲线，进行傅里叶分析，通过一致性分析判断合理性。Mathematical model and physical model are established for power quality problems in order to explore power quality issues conveniently. On the theoretical basis of the analysis posted on the closeness degree between actual electricity and ideal electricity, Fourier analysis method is introduced to describe closeness mathematically and practical significance of αβ two-phase synthetic curve is explained. Circular degree is presented to quantify steady power quality indicators. To verify the rationality of the theory, corresponding αβ two-phase synthetic curve of various power quality problems can be curved and circular degree can be calculated. On calculating circular degree, total harmonic distortion, plotting αβ two-phase synthetic curve, building fast Fourier transformation based on actual measured waveforms, consistency can be judged.

关 键 词：电能质量 综合评估 贴近度 圆形度 

分 类 号：TM71[电气工程—电力系统及自动化]