基于VSC-HVDC的海上石油平台高压大功率输油电机供电系统的建模与控制

Modeling and Control of VSC-HVDC Based on Power Supply System for High Voltage and Power Motor in Offshore Oil Platform

远距离、大容量的海上石油平台向陆上输油环节,需要采用高压大功率电动机,通常平台内自带柴油发电机组,无法满足功率需求,而需要陆上电网供电。在平台离岸距离较远的情况下,采用直流输电经济性较高。文中分析了输油机组供电系统的特性,提出了一种通过电压源型换流器(VSC)为平台机组供电的方法,将VSC在直流输电领域的研究成果与电机驱动相结合,并对其进行了建模分析。该方案利用VSC的特点,实现了对输油电机的平稳起动与稳态下的调速,在力矩波动较大的情况下具有良好的稳定性。利用PSCAD/EMTDC搭建的仿真平台,验证了该方案的有效性。

In offshore oil platform of large capacity far away from the land,high voltage and power motors（HV motor）are needed when delivering oil to onshore land.Diesel generators in platform can＇t support so much power requirement, so the motors mentioned above must be supplied by onshore AC grid. In general,when there is a long distance between offshore platform and onshore land, DC transmission system is more efficient. This paper pro- poses a power supply method for these motors, using voltage source converter（VSC）, and carries it on modeling analysis. This method combines motor drive theory and research productions in DC transmission field. This method, which makes full use of the advantages of VSC, can start the HV motor stably and regulate the rotor speed in steady state,showing excellent stableness toward the disturbance of mechanic torque.The simulation test is done in PSCAD/EMTDC, and the results verify the validity of control method.