海洋石油平台柔性直流输电系统的研发与应用

Study and Application of HVDC Light System in Offshore Oil Platform

提出了一种适合海上油气田的基于电压源变流器(VSC)的柔性直流输电(HVDC Light)方案。该HVDC Light系统拓扑结构采用功率单元级联的形式,无需IGBT串联,可靠性更高,且直流电压等级匹配灵活,两端交流系统无需滤波电路。其整流站为基于直接电流控制的脉宽调制(PWM)单位功率因数整流器,采用定直流电压控制,逆变侧VSC单元采用定交流电压控制策略。通过仿真软件PSCAD/EMTDC对系统和实际控制功能进行建模和仿真,进行了现场试验,并成功投入到现场,验证了所提方案的可行性和可靠性。

A most suitable transmission program of offshore oil platform that is the voltage source converter（VSC） high voltage direct current transmission（HVDC） light system is presented.The HVDC light system topology structure is consitituted by the cascaded power unit which has no seriesed IGBTs, so it guarantees the reliability and flexibility DC voltage level.The bilateral AC systems don＇t need filter circuit.Rectifier station is based on direct current controlling pulse width modulation（PWM） unit power factor rectifier,and uses fixed DC voltage control method.VSC unit of in- verter side uses fixed AC voltage control strategy.The proposed system and control strategy are modeled and simulated through the simulation software PSCAD/EMTDC.Also the field test is successfully put into the field,the feasibility and reliability of the proposed program are verified.