CAJ | 학술논문

针对db20小波的消失矩阶数大，频带划分效果好，但时域紧，支撑性弱，计算量大，实时性差，且db3小波的时域紧，支撑性强，实时性好的特点，结合两者的优势，提出一种基于db20和db3小波变换电力系统的谐波联合分析方法。首先利用db20将源谐波信号进行离散小波变换，将其划分成高频信号和低频信号；然后通过db3将低频信号进行分解。通过Matlab仿真，结果表明该方法在电力系统分析中具有一定的可行性和有效性。
침대db20소파적소실구계수대，빈대화분효과호，단시역긴，지탱성약，계산량대，실시성차，차db3소파적시역긴，지탱성강，실시성호적특점，결합량자적우세，제출일충기우db20화db3소파변환전력계통적해파연합분석방법。수선이용db20장원해파신호진행리산소파변환，장기화분성고빈신호화저빈신호；연후통과db3장저빈신호진행분해。통과Matlab방진，결과표명해방법재전력계통분석중구유일정적가행성화유효성。
The db20 wavelet has characteristics such as high-order vanishing moments, good effect of frequency band division, but bad compact support, large amount of calculation, poor real-time at the same time. However, db3 wavelet does well in compact support and real-time. So combined with their advantages, a kind of conjoint analysis strategy for power system harmonics based on db20 and db3 wavelet transform is put forward. Firstly, db20 is used to conduct discrete wavelet transform on the source of harmonic signal and divide it into low and high frequency signals. Then the low frequency signals are analyzed by db3. The strategy is proved to be applicable and effective in power system analysis by Matlab stimulation.