According to the principle of a minimum investment cost of passive filter and combining the improved inherent structure of network with the harmonic flow algorithm

a harmonic analysis and management software based on Matlab and Delphi language is developed.The software

in addition to general harmonic analysis function

also has two special functions: analysis of parallel and series resonance with the improved inherent structure of network

so to keep resonance numbers of system far away from the number of harmonic sources

to avoid harmonic resonance and harmonic amplification;the optimal allocation position of each class of harmonic filter based on the inherent structure of network is determined

the ratings of filter is subject to optimal design by the use of adaptive differential evolution algorithm so to keep harmonic index of each node of the network meet as much as possible the national standard requirement and reach the purpose of suppressing harmonic distortion of each node of the power grid.In addition

graphics editor with friendly interface and powerful function and also integrated software package of the power system harmonic power flow analysis and optimization filter design are developed.It is shown through practical example of calculation and analysis that the proposed method is correct and effective and the development software is more practical.