Typical Disturbing Load Modeling And The Harmonic Pollution Contribution Calculation

In view of the harmonic problem in power system, a series of norms and standards were formulated by some related research institutions at home and abroad to stipulate the safe threshold of the harmonic voltage and harmonic current. However, we have no effective management for the special customers which they continuously injeck the under standard harmonic to the power system. It is helpful to improve the harmonic problem through calculating the harmonic contributions of the harmonic customers at PCC and formulate corresponding management pattern.The key of harmonic pollution contributions calculation is assessing system equivalent harmonic impedance accurately. Firstly, the existing calculation method of the system equivalent harmonic impedance were discussed in detail, and then explained the advantages and disadvantages of each method and scope. Secondly, the typical harmonic customers were analyzed, and built the simulation models based on their working principle or external characteristics. Them were used to verify the accuracy of the deduced system equivalent harmonic impedance calculation method. The complex field partial linear regression model were proposed in the paper by analyzing the insufficiency and flaw of the existing harmonic impedance calculation method and the data characteristics, and then the iterative subdivision method was proposed for the model. Based on the study of the typical harmonic customers simulation model, the effective multi-voltage level simulation test system was built to verify the accuracy of the proposed method. Finally, the effectiveness and accuracy of the proposed method are verified by the field test.