The Research Of Influence To The Electric Energy Measurement

The electric energy is the main energy of the national economy and people's lives, it plays a very important role to the development of the country. The measurement data involves the tripartite economic benefits of generating electricity, supplying power and using. It is also important bases that a lot of technical indicators are calculated. At present, with a large amount of application in non-linear loads, such as electric and electronic devices etc. The voltage, electric current wave form is often deviated from sine wave. So the harmonic receives the general concern of each side to the research of measuring influence of electric energy. On the base of the existing research results of subject, the influence of harmonic is analyzed correctly in this text from electric energy measure accuracy and electric energy measure rationality two angles. A lot of work have been done in this paper, explain it as follows in detail.The importance of electric energy measurement is explained at first in economic balance and the technical indicator calculating, at the same time the fact that the universality and serious harm of harmonic in the power system is described in the paper. It indicates the important meaning of study electric energy measurement with the situation of harmonic.Through consulting a large number of domestic and foreign language materials , the structure of induction and electron type electric energy meter is introduced, and their operation principle is explained specially in detail. The measuring accuracy influenced by the harmonic is analyzed from the theory particularly, combining the measurement principle of these two kinds of meters, under the condition of that there is only the voltage or the electric current wave form distortion or existing harmonic power. It points out the irrationality of electric energy measurement under current electric energy measuring standard through the expression formula of the electric energy consumed by linear loads and non-linear loads.A large number of simulation experiments are carried on utilizing the Real-Time Digital Simulation (RTDS). The experimental data indicates that induction electric energy meter has heavy error to the total energy value of base and all harmonic energy; and the data also explains electron type electric energy meter can reflect accurately the total value. But no matter every electric energy meter of kind, contradiction of measurement accuracy and rationality exists under current electric energy measuring standard.Suggestion of improving the standard of electric energy measurement and electric rate calculating is offered at the end of the thesis.