Non-iterative harmonic power flow analysis for power systems with multiple harmonic sources

A fast non-iterative harmonic power flow method was proposed in this paper to analyze the power quality problem for power systems with multiple harmonic sources. The harmonic sources were represented as constant PQ loads under fundamental frequency and the operating parameters necessary for harmonic modeling were acquired based on the fundamental frequency power flow results. By solving the system harmonic matrix equations together with the harmonic source model equations, the whole system harmonic power flow results can be calculated without iteration. By using this method, not only the couplings between harmonic voltages and currents but also the mutual effect among distributed harmonic sources can be taken into account. AC/DC converters were used as example harmonic sources to verify the proposed method. However, the method can also be applied to analyze other nonlinear power electronic devices. The comparison results between the proposed method and the PSCAD simulation reveal that the non-iterative algorithm is accurate and fast