Abstract
Electric drive systems with long feeder cables connecting inverter and machine are used for oil exploration, mining, remote operated vehicles, industrial, and aerospace applications. Though this topology has the advantage of providing a better operating environment and easier serviceability for the inverter if the machine is located in an inhospitable and inaccessible environment, it does come with its own drawbacks. Steep-fronted switched voltages and cable-machine surge impedance mismatch can lead to high-amplitude, high-frequency (HF) voltage oscillations along the feeder cable, at the machine terminals, and throughout the machine's stator windings. These effects can cause high-electromagnetic interference, corona discharge, insulation failure in the feeder cable and machine's stator windings, common-mode, differential-mode, and bearing currents. This study discusses the HF issues relating to electric drive systems with long cable feeders. HF models for feeder cable and machine to analyse these phenomena are presented. The effects on long feeder cable loading on inverter switching characteristics are discussed. Methods to mitigate high-amplitude and HF oscillations in such systems are shown.
Highlights
Consider an electric drive system where the inverter and machine are separated by a long feeder cable
Environmental operating conditions need to be taken into consideration with regards to calculating the partial discharge inception voltage (PDIV) and insulation sizing
Applications for electric drive systems with long feeder cables include oil exploration [5], mining [6], remote operated vehicle [7], industry [8], and aerospace. [9] analyses a deep-ocean crude-oil pumping application where the system under study consists of an electrical submersible pump with a 75kW induction machine located at the ocean bed, connected to the inverter at sea-level via a step-up transformer and a 1.6km feeder cable
Summary
Consider an electric drive system where the inverter and machine are separated by a long feeder cable This arrangement is suitable for applications where the machine is operating in an inhospitable/difficult-to-access location while the inverter is in a better, more accessible and serviceable operating environment [1]. High-amplitude HF voltage oscillations can cause problems such as partial discharge leading to the breakdown of cable [3] and machine winding insulation [4], and failure of the drive system. Mitigation of high-amplitude and high-frequency voltage oscillations can reduce and/or eliminate all the problems related to it Because these phenomena are HF phenomena, HF cable feeder models and HF machine models are required.
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