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针对在电力系统频率测量方面存在准确度不高和抗谐波噪声干扰能力不足等问题,提出了一种由序列正交调制和双重正交混频方法联合组成的电力生产数据频率分析与数字滤波方法。详细分析了序列正交调制和双重正交混频方法的原理,并指出了双重正交混频方法可有效抑制基波混频干扰,可有效解决影响正弦频率计算准确度的问题,实现准确度较高的低频正弦频率计算。并且,序列正交调制方法是实现双重正交混频方法的重要前提条件。提出的新方法具有较强的抗谐波噪声干扰特性,适用于电力系统频率的测量。数学计算、仿真实验及物理实验结果表明了新型正弦参数计算方法的正确性和有效性。“,”Since the electric power system has the deficiencies of low accuracy in the aspect of frequency measurement and poor ability to resist the harmonic noise interference,a frequency analysis and digital filtering method for electricity production data is proposed,which is composed of the sequence orthogonal modulation and dual orthogonal frequency mixing. The princi?ples of sequence orthogonal modulation and dual orthogonal frequency mixing are analyzed in detail. It is pointed that the dual orthogonal frequency mixing method can effectively suppress the frequency mixing interference of fundamental wave,and realize the high?accuracy calculation of LF sinusoidal frequency. The sequence orthogonal modulation method is an important precondi?tion to realize the dual orthogonal frequency mixing method. The proposed new method has strong ability to resist the harmonic interference,and is suitable for frequency measurement of electric power system. The results of mathematical calculation,simu?lation test and physical demonstration indicate that the new sinusoidal parameter calculation method is correct and effective.