| Harmonic has become an important element of impact in Power quality in Powersystem. It has become more and more urgent to be solved for positioning harmonicsources accurately and the quantitative responsibility between the power supply and user.At the same time, it is also of great significance for managing and improving the impactof harmonic on the grid.In this paper, it introduced the methods on detecting harmonic at home and abroad.And then these methods of the principles and their advantages and disadvantages areintroduced briefly and systemically. This paper introduced the method of criticalimpedance method (CIM) in detail and put forward a estimation method on CIM which isbeneficial to practical engineering. Then the simulation model is set up under thePSCAD/EMTDC. Through the simulation on critical impedance method and comparingwith engineering estimation method, it realized the harmonic source orientation. Finally,the correctness and practicability of this method is verified. By contrast, the engineeringestimation method contribute to project implementation and it also has practicalsignificance and explore ideas for the research of harmonic source location.This paper also designed a PQDIF management system by C#mixed-languageprogramming and so on to realize function of each module of the system. The datacollection server system convert power quality database or PQDIF file data statisticalanalysis to the volatility of load system of load system SQL Server database. Then thecalculated results will be stored in the SQL Server database through the calculation of thesoftware packages. This paper analyses the pollution harmonic data which were exportedby this system with the engineering estimation method and it realized the harmonicsource location. It has practical significance and explore ideas for the research ofharmonic source location. |
