A novel method for harmonic analysis of AC/DC power systems coupled by thyristor converters

For the harmonic analysis of AC/DC power systems coupled by thyristor converters, a novel method is proposed in this paper, i.e., the switching points sampling (SPS) method. Only recording the sampling data at switching points, merely computing the harmonics of two current equations, the harmonics of the integrated power system containing AC and DC sides can be obtained. The suggested method has the advantages of less memory capacity needed, fast computation and high accuracy. It is very useful and effective in estimating harmonic sources, predicting the harmonic flow and propagation and researching harmonics suppression. According to the number of sampling points and the sampling length, the SPS method can be divided into the twelve points or twenty-four points sampling method and the periodic sampling method. The computing results are in good agreement with measurement results.