| With the acceleration of urbanization process in Zhengzhou, urban traffic congestion problems are worsening, has become an important factor restricting the Zhengzhou city economic development and people’s quality of life improved. Urban rail transit as a new type of transportation, with a large volume, speed, security, punctuality, low energy consumption, less pollution, small footprint, and so on, give priority to the development of urban rail transit as the backbone of the public transport network is the fundamental way to solve traffic congestion problems in Zhengzhou. The Zhengzhou rail transit network is composed of six lines,202.53km, plans to complete the first-stage project of1,2line in2013, initially formed the backbone status of urban rail transit.The power supply system is an important part of rail transport, to ensure Zhengzhou rail transit and Zhengzhou utility grid safe、reliable、economic operation, this paper with Zhengzhou1,2line as the background conduct research from rail transit power supply mode, the rectifier theory and harmonic analysis, harmonic condition assessment and harmonic suppression.This paper combining with the feature of the zhengzhou city rail transit development planning and Zhengzhou city grid carries on the analysis comparison with the technical、economic、safe、reliable and service life of domestic and foreign mature various power supply mode, put forward the rail transit power supply mode of suitable for the development of Zhengzhou city. In MATLAB/Simulink environment,12-pulse and24-pulse rectifier unit model are constructed,carry on analysis about rectifier unit of the AC side and DC side harmonic combining with the urban rail transit traction rectifier unit, compare the harmonic characteristics of24-pulse rectifier unit with12-pulse unit by simulation.This paper constructs a comprehensive assessment method of the grid harmonic based on fuzzy clustering algorithm, this algorithm is simple,good scalability, good, strong applicability, capable of carrying out a rapid harmonic assessment for all types of users and various types of harmonic sources; conclusions of the assessment can provide a reference for harmonic suppression of all types of users. This paper analyzes the rail transit harmonic suppression measures, combined with the comprehensive assessment method to work out a reasonable and effective program of harmonic suppression. |
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