A novel algorithm for harmonic measurement in power system

The leakage and picket effects of discrete Fourier transform (DFT) make it unable to measure the inter harmonics of power system, and gives forth to errors in harmonic analysis in the power system. The windowed interpolating DFT can measure the inter harmonic, while it needs the construction of window functions, which make the implementation and analysis complex. This paper analyzes the leakage and picket fence effects of DFT algorithm, and presents a method to eliminate the leakage effects through a simple transform in the frequency domain instead of adding the window functions and gives the corresponding interpolating algorithms. Analysis results show that the novel algorithms have the character of simple implementation, easy analysis and high precision. Therefore, presenting a satisfactory tool for precise and practical harmonics analysis in power system.