Analysis and specification of DC side voltage in parallel active power filter regarding compensation characteristics of generators

In this paper, an extensive analysis on the influence of DC side voltage to the performance of PAPF is carried out, and a specification of the DC side voltage rated value is presented. First, through equivalent circuit analysis and Fourier Transform analytical expressions, a required lowest value of DC side voltage for full compensation (a zero source current THD) is obtained for six-pulse converter harmonic current, where PAPF is providing six-pulse converter harmonic current. For the situation, of which the DC voltage is smaller than the above-obtained lowest value, the quantitative relationship between the DC voltage and the total harmonic distortion after compensation is also elaborated in the paper by using the diagram of curve relationship. Based on these analysis, the specification of DC voltage rated value for PAPF is quite straight forward. Simulation investigation results are finally provided to verify the analysis and specification.