In order to eliminate the influence of distortion that may occur in the voltage,a phase-locked loop circuit was used to obtain the positive sequence of the voltage and the active power was corrected. It not only inhibits the effects of voltage distortion but also improves the real time performance of detection. The Matlab was used to simulate the detection method base on UPF and the improved method with phase-locked loop in the different voltage conditions. Simulation result shows that the latter method can detect the load harmonic and reactive current components. In the end,the effectiveness of the latter method is validated by APF experiment based on DSP.% 为了抑制电网电压畸变对基于单位功率因数(UPF)的谐波电流检测法的影响，在该方法中引入锁相环电路以提取电压的正序分量，并且进行有功功率的修正。这样既能抑制电压畸变的影响又提高了检测的实时性。利用Matlab软件对引入锁相环前后的UPF法在不同的电网电压条件下进行对比研究，结果表明后者可以准确检测出负载电流的谐波及无功分量。最后通过基于DSP的有源滤波器实验证明了此方法的有效性。
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