Abstract
Monitoring and early fault prediction of large electrical machines is important to maintain a sustainable and safe power system. With the ever-increasing computational power of modern processors, real-time simulation based monitoring of electrical machines is becoming a topic of interest. This work describes the development of a real-time digital twin (RTDT) of a wound rotor induction machine (WRIM) using a precomputed finite element model fed with online measurements. It computes accurate outputs in real-time of electromagnetic quantities otherwise difficult to measure such as local magnetic flux, current in bars and torque. In addition, it considers space harmonics, magnetic imbalance and fault conditions. The development process of the RTDT is described thoroughly and outputs are compared in real-time to measurements taken from the actual machine in rotation. Results show that they are accurate with harmonic content respected.
Highlights
Real-time simulation based monitoring of physical systems through digital twins is getting more attention due to the ever-increasing computational power of modern processors [1,2]
A computationally efficient model is needed because real-time constraints impose that the simulation time step be larger than the computation time it takes in real-world clock [7]
It considers space harmonics and magnetic imbalances since any machine geometry can be modeled in a finite element method (FEM) software; Any number of electrical circuits can be added to the models, including phase windings and bars, dampers and even search coils
Summary
Real-time simulation based monitoring of physical systems through digital twins is getting more attention due to the ever-increasing computational power of modern processors [1,2]. These models considers the geometry of the machine to a certain extent only, because simplifications are made to make analytical calculations manageable and efficient It was demonstrated in [14] that, by using a magnetically coupled circuit approach using precomputed inductance functions with a FEM software, it is possible to reach relatively small computation times while keeping the accuracy of FEM. It has three major strong points: 2 It considers space harmonics and magnetic imbalances since any machine geometry can be modeled in a FEM software; Any number of electrical circuits can be added to the models, including phase windings and bars, dampers and even search coils. After a detailed explanation on the model’s construction and implementation on digital real-time simulator (DRTS), results are validated by comparing in real-time the RTDT’s outputs to the physical machine’s measurements
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