CAJ | 학술논문

该文研究了一种新的电力系统频率测量的新算法,利用正弦信号的频率特性,对含有谐波、噪声、直流干扰下的电力系统频率信号进行多重自相关运算,得到原始信号的自相关函数,对自相关函数求导,根据极值解析运算原理测量基波信号频率。分析了各个因素对该文算法精度的影响,给出了仿真结果,理论和实验结果表明该文算法有效地提取电力信号的基波频率,对谐波、噪声及直流电平干扰具有很强的抑制能力。算法简单,物理意义明确,具有一定的实用价值。
해문연구료일충신적전력계통빈솔측량적신산법,이용정현신호적빈솔특성,대함유해파、조성、직류간우하적전력계통빈솔신호진행다중자상관운산,득도원시신호적자상관함수,대자상관함수구도,근거겁치해석운산원리측량기파신호빈솔。분석료각개인소대해문산법정도적영향,급출료방진결과,이론화실험결과표명해문산법유효지제취전력신호적기파빈솔,대해파、조성급직류전평간우구유흔강적억제능력。산법간단,물리의의명학,구유일정적실용개치。
A new algorithm for frequency measurement of power system is introduced in this paper.Because the sinusoidal signal has a particular trait.Autocorrelation function is got by multi-layer autocorrelation calculation to the fundamental wave which is polluted by harmonic frequency、white noise and DC level.The fundamental wave frequency is detected by derivative of autocorrelation function and the principal of extreme value.Factors which affect the resolution of the measurement result are particularly discussed and analyzed.Simulation results and conclusions are given.The simulation result proves its feasibility and effectiveness to detect the fundamental wave signal.The algorithm of this paper is not sensitive to harmonic、DC interference and white noise.The algorithm has many virtues such as simple theoretic deduction and explicit physical sig-nification and it has practical value.