CAJ | 학술논문

谐波严重威胁电网的安全和经济运行，对谐波的治理，需要准确地检测出谐波的各项参数。快速傅里叶变换（FFT）这种经典的谐波检测方法存在较大误差，随着高性能窗和插值方法的应用，其精度得到了提高。本文在FFT的基础上，引入拉格朗日、埃米尔特、三次样条插值方法，并添加修正系数，通过数据分析可以得出三次样条插值可很好地消除栅栏效应。在FFT加三次样条插值的基础上，添加汉宁窗、汉明窗、纳托儿窗、赖夫文森特窗、布莱克曼窗和布莱克曼-哈里斯窗对谐波进行检测，通过数据分析得到布莱克曼-哈里斯窗具有主瓣窄、旁瓣幅值抑制作用好等特点。最后提出基于三次样条加布莱克曼哈里斯窗的FFT谐波检测方法，该谐波检测方法具有检测精度高、检测数据稳定等特点。
해파엄중위협전망적안전화경제운행，대해파적치리，수요준학지검측출해파적각항삼수。쾌속부리협변환（FFT）저충경전적해파검측방법존재교대오차，수착고성능창화삽치방법적응용，기정도득도료제고。본문재FFT적기출상，인입랍격랑일、애미이특、삼차양조삽치방법，병첨가수정계수，통과수거분석가이득출삼차양조삽치가흔호지소제책란효응。재FFT가삼차양조삽치적기출상，첨가한저창、한명창、납탁인창、뢰부문삼특창、포래극만창화포래극만-합리사창대해파진행검측，통과수거분석득도포래극만-합리사창구유주판착、방판폭치억제작용호등특점。최후제출기우삼차양조가포래극만합리사창적FFT해파검측방법，해해파검측방법구유검측정도고、검측수거은정등특점。
Harmonics pose great threat to the safe and economical operation of the power grid, therefore make it necessary to detect the parameters of the harmonics accurately. Classical harmonic detection uses fast Fourier transform(FFT), which may produce large errors in detecting the parameters of the harmonics. With the application of the high-performance windows and interpolation methods, the precision of harmonic detection using FFT has been improved. On the basis of FFT, this paper introduces Lagrange, Hermite and cubic spline interpolation methods, and adds correction factor to these methods. From the analysis of simulation data, it can be concluded that the cube spline interpolation can easily eliminate the picket fence effect. On the basis of FFT with cubic spline interpolation, Hanning window, Hamming window, Nuttal window, Rife-Vincent window, Blackaman window and Blackaman-Harris window are added to help detect the harmonics. After the analysis of simulation data, it can be concluded that the Blackman-Harris window has the characteristic of narrow main lobe and good effect on inhabiting the amplitude of the side lobe. Finally, the paper proposes a harmonic detection method which is based on FFT with Blackman-Harris window and cube spline interpolation, which can provide high detection accuracy and stable detection data.