CAJ | 학술논문

该文研究了一种基于多重相关原理的电力系统频率估计算法，利用正弦信号的相关特性，对信号进行多重相关运算．极大地提高了信号的信噪比，提高了测量精度。分别讨论了信号的信噪比，采样点数，MD的量化位数对测量结果的影响，并给出了具体的仿真结果，并与传统的疗法进行了比较。实验表明这种方法能有效地对信噪比很低的信号的频率进行估计，在低信噪比下，精度比传统的方法要高1-2个数量级，而且算法简单，物理意义明确，精度却可以满足工程的要求。
해문연구료일충기우다중상관원리적전력계통빈솔고계산법，이용정현신호적상관특성，대신호진행다중상관운산．겁대지제고료신호적신조비，제고료측량정도。분별토론료신호적신조비，채양점수，MD적양화위수대측량결과적영향，병급출료구체적방진결과，병여전통적요법진행료비교。실험표명저충방법능유효지대신조비흔저적신호적빈솔진행고계，재저신조비하，정도비전통적방법요고1-2개수량급，이차산법간단，물리의의명학，정도각가이만족공정적요구。
A new method of frequency measurement is introduced in this paper.By the trait of sinusoidal signal we do some times autocorrelation, which can improve Signal-to-Noise effectively.Length of sampled data,signal -noise ratio and number of ADC quantization bits which influence precision of phase difference measurement are particularly discussed and analyzed.Simulation results and conclusion are given,The simulations proves its feasibility and effectiveness to detect the phase difference.This method has many virtues such as simple theoretic deduction and explicit physical signification,Experiment results indicate this method can estimate signal＇s frequency effectively,it improves 1 - 2 number degree compared to the traditional method.