Modeling and Simulation for Inter-harmonics of Double PWM AC Speed Control System for Port Bridge Crane

doi:10.16182/j.issn1004731x.joss.201707026

Abstract

Abstract: When the total capacity of double PWM reversible speed control system in distribution network accounts for a larger proportion of power grid capacity, the power quality pollution, or even voltage flicker is generated by interharmonics of double PWM system. Therefore the stable operation of the power grid is affected. Based on the studies on bridge crane system in Shanghai Deep water Port area, a mathematical model of multi-quadrant double PWM reversible speed control system was established. In accordance with the operating characteristics of motor, the inter-harmonic currents, injected into grid were simulated at different speeds respectively in the power and feed state. Simulation outcomes and measured results both proved the feasibility and validity of the model. The reasons for voltage flicker in distribution network were revealed by the model, and the model has been applied successfully in the power quality control system of Shanghai Deep water Port areaand themicro-grid voltage flicker problems have been successfully solved.

Key words: double PWM, bridge crane, mathematical model, grid-side current, interharmonic

CLC Number:

Yang Wenhuan, Yang Dirui, Li Ronggao. Modeling and Simulation for Inter-harmonics of Double PWM AC Speed Control System for Port Bridge Crane[J]. Journal of System Simulation, 2017, 29(7): 1596-1604.

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