深海电机无功功率就地补偿技术研究

Research on Reactive Power Compensation for Deep Sea Motors

许多用于深海的机电设备上都使用三相交流深海电机,需要通过脐带缆从海面支持母船供电。由于深海电机功率因素低,供电脐带缆需要传输大量无功功率,这使得供电电流大幅增加,导致水下设备可用电功率不足、供电缆发热严重及缆端供电电压波动大等问题。解决这些问题的最经济实用的办法就是对深海电机进行无功功率就地补偿。以深海岩芯钻机及其配套的深海电机为例,导出了对深海电机进行无功功率就地补偿的一般理论计算公式,给出了实现该技术的一般方法。试验研究表明,在合适的条件下采用无功功率就地补偿技术,可使电缆供电电流下降30%以上(或者水下可用电功率提高30%以上),电缆沿程发热功率降低50%以上。

3-phase AC deep sea motors are widely used on many deep sea equipments.These motors usually get their power source via umbilical cables from the surface vessel.Because of their low power factors,their umbilical cables must transmit a lot of reactive power,resulting in unnecessary high currents.This may lead to many problems such as high temperature of the cables,big voltage fluctuations,etc.A good solution to this is to compensate the reactive power in situ.This paper takes the deep sea rock drill as an example,brings about a common calculation method and an overall technology for in-situ reactive power compensation of deep sea motors,and gives the lab verification experiment results.