海底安装用9 - 12 MVA变速驱动器的浅水试验

H. Lendenmann, T. Laneryd, E. Virtanen, Raphael Cagienard, T. Wagner, Kim Missing
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引用次数: 2

摘要

介绍的电动变速驱动(VSD)系统设计用于安装在海底,驱动附近泵和气体压缩机的电动机。VSD的模块化概念被开发出来,旨在操作各种水下电机,功率从0.5到18 MVA,电压从2.0 kV到7.2 kV或更高,基频高达300 Hz。可以容纳从几公里到600公里以上的步出距离。压力补偿设计有效地消除了下入深度的限制。压力补偿是通过将包括驱动变压器在内的驱动硬件浸入也充当冷却剂的介电液体中来实现的。电力组件,包括电容器、半导体和控制电子设备,设计了更大的余量和冗余硬件、耐压性,并选择了与介电液体兼容的材料,以实现整个VSD的高度可靠设计。该驱动器被部署到芬兰瓦萨一个港口的浅水中进行测试。顶部侧站采用了“power - in -the- loop”方法,其中VSD输出能量被恢复到驱动器输入,这样电网只提供损失的功率,而不提供更高的循环功率。在不同功率水平下,变频器在22千伏输入电压和6.9 - 7.2千伏输出电压下工作1000小时以上。我们从第一次浅水测试中得出结论,VSD系统的所有组件在1000 A输出电流下都能正常工作。成功地测试了反映预期应用的不同操作条件,包括冗余能力。热性能得到了广泛的验证,包括一个可选的外部热交换器,即使在温暖的水域也能达到高额定值。据我们所知,这是中压驱动器首次在海水环境中以9至12 MVA的电压长时间工作。其所有模块的设计工作深度为10000英尺/ 3000米或以上,并根据API17F和sepps 1002完成资格认证。
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Shallow Water Testing of 9 - 12 MVA Variable Speed Drive for Subsea Installation
The electrical Variable Speed Drive (VSD) system presented is designed for installation on the sea floor to drive nearby electric motors for pumps and gas compressors. A modular concept of the VSD is developed and intended to operate a wide range of subsea motors of powers from 0.5 to 18 MVA, with voltages from 2.0 kV to 7.2 kV or more, and fundamental frequencies up to 300 Hz. Step-out distances from a few km to over 600 km can be accommodated. The pressure compensated design effectively removes limits as to the depth of deployment. Pressure compensation is achieved by submerging the drive hardware including the drive transformer in a dielectric liquid which also acts as coolant. The electric power components, including capacitors, semiconductors, and the control electronics are designed with increased margins and redundant hardware, pressure resistance, and materials chosen for compatibility with the dielectric liquid, to achieve a highly reliable design of the overall VSD. The drive was deployed into shallow water in a harbor in Vaasa Finland for testing. A top side station was built implementing a "Power-In-the-Loop" approach, where the VSD output energy is recovered back into the drive input such that the grid supply only provides the lost power, but not the much higher circulated power. The drive operated more than 1000 h at 22 kV input and 6.9 - 7.2 kV output voltage at different power levels. We conclude from this first shallow water test, that all components of the VSD system work properly together up to 1000 A output current. Different operation conditions reflecting the envisioned application, including redundancy capability were successfully tested. The thermal performance was extensively verified, including an optional external heat exchanger to achieve high ratings even in warm waters. To our knowledge this is the first time a medium voltage drive is operated at 9 to 12 MVA for an extended time submerged in a sea water environment. All its modules are designed to operate down to depths of 10’000 ft / 3000 m or more and are concluding qualification according to API17F and SEPS 1002.
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