Post-Fault Demagnetization of a PMSG Under Field Oriented Control Operation

Abstract

To assess demagnetization, a line-to-line short-circuit fault study is carried out with constant input torque and field-oriented control (FOC) for the speed of a permanent magnet synchronous generator (PMSG). For the study, a cosimulation between finite element analysis (FEA), power electronics simulation (Simplorer) and model-based control design software (Matlab Simulink) is used. The analyzed system was previously validated in the experimental set-up with DS1103 card. The initial short circuit currents, although higher than nominal, did not present a risk of demagnetization for the generator in the analyzed working conditions, namely magnets temperature and speed. Nevertheless, the acceleration during the fault, due to constant input torque, and the control scheme with a constant speed reference, provided a greater demagnetizing current while breaking the machine speed back to the pre-fault reference. The cosimulation results bring higher fidelity to the modeling and analysis of the behavior of the PMSG under FOC.

Active and reactive power vector control using neural-synergetic-super twisting controllers of induction generators for variable-speed contra-rotating wind turbine systems

“…The WS at any point between the two turbines can be calculated using equation (7). This equation has been explained in several works.…”

“…3 The FOC strategy relies on estimating capabilities, which makes it affected by changing machine parameters, which is undesirable. This strategy has been applied to several electrical machines such as induction machine, 4 asynchronous generator, 5 synchronous motor, 6 synchronous generator, 7 Brushless DC motor, 8 and interior permanent magnet synchronous machines (PMSMs). 9 This strategy has two types: the direct FOC (DFOC) strategy and the indirect FOC (IFOC) strategy, where the difference between them lies in complexity, durability, performance, ease of implementation, and ease of application on electrical machines.…”

A Fault-Tolerant Control Strategy for D-PMSG Wind Power Generation System

“…However, due to the output capacity limitation and overload protection of the converter, the stator current amplitude cannot exceed the limit value. When the stator current reaches the limit, the electromagnetic torque will decrease, and the motor speed will decrease accordingly [21,22]. However, the speed of D-PMSG is correlated with the wind speed of the wind farm in real-time.…”