The Analysis Of The Influence Of The Harmonics To The Electric Energy Measurement And The Solving Measures

Electricity is the main energy of the national economy and people’s lives, plays an important role in the development of the country. Energy measurement data related to power generation and supply and the tripartite economic interests, but also an important basis for many technical indicators calculation.At present, with the application of power electronic devices such as non-linear loads, power grid voltage and current waveforms distortion often occurs for a deviation from the sine, study of the influence of harmonic on electric energy metering concerned by the parties. Based on the research of the subject, from harmonics on electric energy metering accuracy influence on electric energy metering and studied the effects both of rationality.First discussed energy measurement in economic settlement and indicators calculated on the importance of technology, describes the universality of harmonic in power system and the serious harm of harmonics, which shows the importance of harmonic electric energy measurement under the conditions.Through a large number of domestic and foreign literature, summarizes the potential impact of harmonics on metering Metering. Analysis on harmonic environment, PT, and CT The influence on electric energy metering, results show that the amplitude and phase error on harmonic measurement will have a greater impact. Introduces inductive and electronic structure of two types of energy meter based on detailed the inductive and electronic energy meter with digital multiplier principle of measurement. Theoretical analysis of the influence of harmonic on electric energy metering accuracy, combined with the two tables of the measure, current harmonics and waveform distortion power only two circumstances, doing a detailed analysis and discussion and experimental tests. By harmonic derivation of linear and nonlinear load electric energy, pointed out that under the existing energy metering of electric energy metering in unreasonable, new electric energy metering. And in the harmonic context, power tables by adding filters to reduce the effect of harmonics on metering, experimental results show that the voltage and current acquisition and low pass filter is installed between the multiplier electronic Watt-hour meter in the harmonic context, the fundamental electric energy meter for measuring is much better than no filtering.