光伏发电系统中电能质量的分析与测试.docxVIP

学兔兔 www.xuetut 第52卷 第6期 电 测 与 仪 表 Vol.52 No.6 2015年 3月25 日 Electrical Measurement Instrumentation Mar.25,2015 光伏发电系统中电能质量的分析与测试* 蒋强，党裕民，李敏，张自友 (乐山师范学院物理与电子工程学院，四川乐山621000) 摘要：随着新能源发电系统接入大电网，传统的电能质量分析方法和分析指标已经不能衡量电网质量的要求。 现在分析电能质量不仅要分析传统的参数，通常还要分析其稳态和暂态。分析稳态时，交流电压分析其波形畸 变情况，分析谐波、幅度、频率和电磁干扰等。暂态分析则分析电能质量的频谱和持续时间特征。对光伏系统 中的电能质量的谐波和三相不平衡度进行了理论分析和谐波的软件测试方法，理论上分析了时域仿真、频域仿 真以及傅里叶变换、多刻度形态谱变换以及小波变换分析电能质量的特征。做了一台试验样机，对逆变电源系 统的电能质量进行了测试和分析，通过测试可知，采用的分析方法能实时检测电能质量的各项指标，从而为电 能质量的各项参数指标提供了一个可靠的数据。 关键词：电能质量；三相不平衡；谐波；虚拟仪器 中图分类号：TM461 文献标识码：B 文章编号：1001- 1390(2015)06-0011-05 The power quality analysis and testing in photovoltaic system Jiang Qiang , Dang Yumin,Li Min, Zhang Ziyou (School of Physics and Electric Engineering,Leshan Normal University, Leshan 614000, Sichuan,China) Abstract: With access of new energy power generation to power system, traditional power quality analysis methods and indicators can not meet the requirements of measuring the power quality. Now the analysis of power quality should analyze not only the traditional parameter, but also the steady and transient of the power quality. When it is in the steady state, the waveform distortion, harmonic analysis, amplitude, frequency and electromagnetic interference are analyzed by the AC voltage. And when it is in the transient state, the spectrum of the power quality and the duration characteristics are analyzed. In this paper, the harmonic of the power quality and three-phase imbalance degree in photovoltaic system are analyzed theoretically and by software testing methods. The characteristics of the power quality are theoretically analyzed by the time domain simulation, frequency domain simulation, Fourier transform, multiscale morphological spectrum transform and wavelet tr