基于液压传动的独立运行潮流能发电系统变速恒频控制

Variable-speed Constant-frequency Control of a Stand-alone Tidal Current Energy Conversion System Based on Hydraulic Transmission

在潮流能发电系统中采用液压传动方式是一种全新的探索。文中提出了基于液压传动的独立运行式变速恒频潮流能发电系统。在介绍了系统组成及工作原理后,进行了理论分析并提出通过调节泵排量、负载大小及马达排量来实现系统变速恒频恒压复合控制的调控原理。建立了整机系统的仿真模型,并进行了有无控制条件的仿真对比试验。仿真结果显示,基于所述调控原理的液压式潮流能系统能够实现变速恒频恒压运行,验证了理论分析的正确性,为真实系统的设计及试验提供了理论依据。针对真实样机系统开展的拖动试验进一步验证了液压传动在潮流能系统中应用的可行性。

Application of hydraulic transmission in tidal current energy conversion system is a new exploration.A stand-alone variable-speed constant-frequency tidal current energy conversion system based on hydraulic transmission is proposed.The system components and working principle are introduced first followed by the theoretical analysis of the system.Based on the adjustment of the pump displacement,the load size,and the motor displacement,a regulation and control principle for the variable speed,constant frequency and pressure operation of the system is proposed.A simulation model is established for the whole system,and a series of tests are conducted with and without controllers,respectively.The simulation results show that with the proposed regulation and control principle,the variable speed,constant frequency and pressure operation of the hydraulic tidal energy system can be achieved.This verifies the correctness of the theoretical analysis and provides theoretical basis for the design and tests of the actual system.Furthermore,the run-in tests of the prototype system based on a motor driving test bed have verified the feasibility of the application of the hydraulic transmission to the tidal current energy systems.