Simplified modeling evaluation method for harmonic power of three-phase rectifier unit

Abstract

The invention provides a simplified modeling evaluation method for the harmonic power of a three-phase rectifier unit. On the basis of a built harmonic power model of a three-phase rectifier unit, a harmonic power admittance matrix corresponding to the harmonic power model is built according to the coupling relationship between the harmonic voltage and current of the rectifier unit, and the distribution of contribution of different harmonic components of the end voltage to each harmonic power is analyzed. Thus, the element areas having less contribution to harmonic power in the harmonic power admittance matrix can be eliminated, and the harmonic power admittance matrix is simplified. Then, a simplified harmonic power model of the three-phase rectifier unit is reversely derived according to the simplified harmonic power admittance matrix to calculate the harmonic power evaluation value of the three-phase rectifier unit. The calculation model of harmonic power of the three-phase rectifier unit is simplified greatly. Moreover, based on the fact that the calculated harmonic power evaluation value of the three-phase rectifier unit still has high reference reliability, effective reference information can be provided for practical work.

Description

technical field [0001] The invention relates to the technical field of power system monitoring and harmonic suppression of industrial electrical equipment, in particular to a simplified modeling and evaluation method for harmonic power of a three-phase rectifier unit. Background technique [0002] At present, the development of the power system has become an important part of the national economy and people's livelihood. According to statistics, my country's electricity consumption is also increasing year by year with the development of the economy. At the same time, the traditional power industry is changing to a highly intensive, highly knowledge-based, and highly technological direction, and the power grid has become one of the largest and most complex machines in the world. With the continuous reduction of traditional energy sources and the increasing energy demand with the continuous development of the global economy, efficient and optimized use of energy is very impor...

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Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a simplified modeling and evaluation method for the harmonic power of a three-phase rectifier unit with simpler calculation and higher reference reliability, so as to facilitate the three-phase rectifier Analyze the harmonic power of the unit to provide reference for load forecasting, power grid planning, etc., so as to solve the problem that the harmonic power analysis method of the three-phase rectified load in the prior art is too complicated and difficult to be practically applied

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