Vibration of Induction Machine Supplied With Voltage Containing Subharmonics and Interharmonics

Effects of Voltage Interharmonics on Cage Induction Motors

“…Interharmonics can disturb the work of power electronic equipment, measurement and control systems [20][21][22], induction motors [23], and light sources, including commonly applied LEDs [24]. At the same time, power quality standards generally do not provide limitations of interharmonics.…”

“…Undesirable phenomena due to the interharmonics' occurrence have been discussed in numerous works [20][21][22][23][24][26][27][28][29][30][31][32][33][34][35]. In [26][27][28][29][30], induction motors under voltage fluctuations were analysed.…”

“…As periodic voltage fluctuations can be considered as the superposition of subharmonics and interharmonics, the results of the research cannot be used for imposing a limitation on interharmonics occurring as a single power quality disturbance. The influence of interharmonics appearing as a single power quality disturbance on an induction motor was investigated in [18,23,31,32]. References [18,23,31,32] show that voltage interharmonics caused the flow of rather moderate current subharmonics and interharmonics and resulted in a minor increase in power losses, windings temperature and vibration, slightly exceeding its admissible level for long-term continuous machine operation [33].…”

“…The influence of interharmonics appearing as a single power quality disturbance on an induction motor was investigated in [18,23,31,32]. References [18,23,31,32] show that voltage interharmonics caused the flow of rather moderate current subharmonics and interharmonics and resulted in a minor increase in power losses, windings temperature and vibration, slightly exceeding its admissible level for long-term continuous machine operation [33]. It should be noted that in [23] the vibration was investigated for the interharmonics of frequencies not exceeding 70 Hz because of the speed limit of the alternator used for the generation of interharmonics.…”

Stator Electrical Fault Detection in DFIGs Using Wide-Band Analysis of the Embedded Signals From the Controllers

“…Stator electrical faults such as phase resistance variations or short circuit faults, which are commonly known as a 'high resistance connection', typically produce stator electrical asymmetry (SEA) [6,7], and are shown to significantly contribute to WT generator total failure rates for all sizes of WTs [8,9]. SEA is generally caused by a poor connection, and can result in thermal overloading and voltage unbalances [10]. Therefore, it is important to use fault detection techniques for the recognition of SEA.…”