| In recent years, the rapid development of wind power industry in the world plays an important role in alleviating environmental crisis and energy crisis. As a new model, hydraulic type wind turbine, compared with the traditional wind machine of double fed type and direct drive type, has the advantages of high power to weight ratio and real-time adjustability of reduction ratio. In order to facilitate installation, promotion and product maintenance of the hydraulic type wind turbine, hydraulic floor type wind turbine becomes a research point which sets by floor mounted, changes the configuration structure of transmission system and then has an influence on the characteristics of hydraulic system, the paper, which aims at studying pump controlled hydraulic motor system with the long pipeline, focuses on the influence of long pipeline on hydraulic system and investigates the steady control strategy of grid connected power under the conditions of long pipeline.Aiming at the influences of long pipeline on system, this paper has established the basic equation of dynamic characteristics of fluid transmission pipeline, and compared the three modeling methods of system speed transfer function, and then analyzed of the scope of application of the three kinds of modeling methods. Based on the theory of linear fluid friction, we analyzed the influence of system parameters on the speed of the transfer function. And pushed the export and entrance export pipeline pressure transmission ratio of amplitude frequency characteristic model of hydraulic pressure, landing in the frequency domain type pipe wind power system transmission characteristics. With the MATLAB numerical simulation calculation, we got the influences of pipe length, diameter, density and other parameters on the oil pressure transmission system study on the pipeline system, and produced fluid resonance condition.In the study of the speed control unit in wind turbine, based on the previous work, indirect flow feedback and direct speed closed-loop control strategy are applied to discuss the long pipeline system in detail. By using the AMESim software, quantitative pump- variable motor long pipeline hydraulic system simulation model is setted up to study main parameters of the system for getting its influence regularity on quantitative pump-variable motor system with long pipeline. Based on theoretical and simulation analysis, the resonant characteristics of the system are analyzed and studied in 30 k W hydraulic type wind turbine simulation experimental platform. |
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