【摘要】 在智能化采集控制单元的采样频率被固定的情况下,如果电网信号频率发生偏移,计算电参量有效值就会发生频谱泄露和栅栏效应,导致测量精度不高、误差较大,频率跟踪插值抽取法则可以克服因为信号频率偏移后出现的一系列问题。通过实例仿真结果表明,该方法在频率偏移情况下,能保证电压、电流有效值计算精确,低次谐波分析准确。并给出了该算法的运用前提条件和信号实际频率的测量方法,从根本上解决了频谱泄露和栅栏效应的问题。更多还原

【Abstract】 In case of the intelligent capture control unit’s sampling frequency is fixed,if the power signal’s frequency shifted,the electrical parameters’s rms will gernate spectral leakage and the barrier effect,resulting in measurement accuracy is not high,the error is larger.Extraction method for frequency tracking interpolation can overcome a series of problems after the signal frequency offset.Simulation result show that this method is in the case of the frequency offset to ensure that voltage and current rms calculation is precision,low of harmonic analysis is accuracy.And the measurement methods of signals’ actual frequency is given,which is precondition of the algorithm,and it is a fundamental solution to solve the problem of spectrum leakage and barrier effect.更多还原