超导储能微网控制与小波加窗谐波检测研究  

Harmonic detection of VSC superconducting energy storage microgrid system based on wavelet windowed FFT

作　　者：李念 周强[2] Li Nian;Zhou Qiang(Mianyang Polytechnic,Mianyang 621000,China;School of Electrical and Control Engineering,Shaanxi University of Science&Technology,Xi'an 710016,China)

机构地区：[1]绵阳职业技术学院,绵阳621000 [2]陕西科技大学电气与控制工程学院,西安710000

出　　处：《低温与超导》2023年第1期15-20,39,共7页Cryogenics and Superconductivity

基　　金：国家自然科学基金(62001198)资助。

摘　　要：为保证超导储能微网的正常运行与电能品质,提出控制与谐波检测策略。结合双环控制可实现超导储能微网系统的VSC(voltage source converter,VSC)模块有功与无功功率调节,借助加Nuttall窗的改进FFT(Fast Fourier Transform,FFT)能完成微电网信号的时域分析,获得突变信号,进行谐波检测。采用20 kJ/15 kW超导储能微网模拟实验平台结合Matlab 2021a处理实验数据,结果表明,采用双环控制的SMES(superconducting magnetic energy storage,SMES)模块可有效抑制谐波,将谐波能量平衡地分散于整个区间,使母线电压仅呈现低幅值波动,该方法的谐波检测精度得到明显提升。In order to ensure the normal operation and power quality of superconducting energy storage microgrid,a control and harmonic detection method was proposed.Combined with the double-loop control method,the active and reactive power regulation of the voltage source converter(VSC)module of the superconducting energy storage microgrid system was realized.The improved Fast Fourier Transform(FFT)with Nuttall window can complete the time domain analysis of the microgrid signal,obtain the abrupt signal,and complete the harmonic detection.The improved FFT method with Nuttall window was used to complete the harmonic detection.The 20 KJ/15 KW superconducting energy storage microgrid simulation experiment platform combined with Matlab 2021a was used to process the experimental data.The results show that the superconducting magnetic energy storage(SMES)module with the double-loop control can effectively suppress the harmonics and evenly distribute the harmonic energy in the whole interval,so that the bus voltage only presents low amplitude fluctuation.In addition,the harmonic detection accuracy of our method is obviously improved.

关 键 词：谐波检测 VSC 超导储能 小波 FFT 

分 类 号：TM732[电气工程—电力系统及自动化]