Low Switching Frequency Deadbeat-Direct Torque and Flux Control of Wound Field Synchronous Machines

2018 ◽  
Author(s):  
Yue Nie ◽  
Ian P. Brown ◽  
Daniel C. Ludois
Keyword(s):  
Synchronous Machines ◽  
Switching Frequency ◽  
Flux Control

scholarly journals Investigation and Experimental Validation of Sideband Harmonic Vibration of IPMSM with and without Skewed Slots for EVs

2021 ◽  
Vol 12 (4) ◽  
pp. 223
Author(s):  
Zhenkang Feng ◽  
Daohan Wang ◽  
Chen Peng ◽  
Wentao Feng ◽  
Bingdong Wang ◽  
...  
Keyword(s):  
Pulse Width Modulation ◽  
High Efficiency ◽  
Torque Ripple ◽  
Synchronous Machines ◽  
Switching Frequency ◽  
Permanent Magnet Synchronous Machines ◽  
Steady State Operation ◽  
Voltage Harmonics ◽  
The Magnetic Field ◽  
Vector Control Strategy

Due to their advantages of high power density and high efficiency, permanent magnet synchronous machines (PMSMs) are widely used in the field of electric vehicles (EVs). Vibration and noise are important indicators for evaluating the performance of PMSMs, and the skewed slot method is now widely used to mitigate the torque ripple and noise of motors. In the vector control strategy, the space vector pulse width modulation (SVPWM) method produces sideband voltage harmonics with a frequency near the switching frequency. These harmonics act on the magnetic field to generate an excitation force with a frequency near the switching frequency. This paper compares and analyzes the sideband harmonic current and the exciting force of a skewed slot motor and a straight slot motor during steady-state operation. The research results show that the skewed slot method can effectively mitigate the vibration and noise caused by sideband harmonics.

scholarly journals Stator Fixed Deadbeat Predictive Torque and Flux Control of a PMSM Drive with Modulated Duty Cycle

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2769
Author(s):  
Omar Sandre Hernandez ◽  
Jorge S. Cervantes-Rojas ◽  
Jesus P. Ordaz Oliver ◽  
Carlos Cuvas Castillo
Keyword(s):  
Duty Cycle ◽  
Reference Frames ◽  
Control Strategies ◽  
Synchronous Machines ◽  
Permanent Magnet Synchronous Machines ◽  
Flux Control ◽  
Voltage Vector ◽  
Parameter Variations ◽  
Coupling Dynamics ◽  
Stationary Reference Frame

Conventional deadbeat control strategies for permanent magnet synchronous machines (PMSMs) are commonly developed reference frames, however, coupling dynamics affect the performance drive, and rotational transformations are required for the synthesis of the final voltage vector (VV). To improve robustness against parameter variations and to directly synthesize the reference voltage vector, in this paper a deadbeat predictive torque and flux control for a PMSM is presented. The proposed controller is developed in the stationary reference frame (α−β). First, the reference VV is obtained from a predictive deadbeat controller. Then, the reference VV is applied to the power inverter by the combination of two voltage vectors. A duty cycle optimization is employed to calculate the required time for the application of each voltage vector. Experimental results based on an FPGA and a comparison of the conventional and the proposed deadbeat controller are presented to validate the proposed methodology.

scholarly journals Direct Flux Control for Stand-Alone Operation Brushless Doubly Fed Induction Generator Using Resonant-Based Sliding-Mode Control Approach

2018 ◽  
Author(s):  
Kai Ji ◽  
Shenghua Huang
Keyword(s):  
Sliding Mode Control ◽  
Control Strategy ◽  
Sliding Mode ◽  
Dynamic State ◽  
Induction Generator ◽  
Switching Frequency ◽  
Doubly Fed Induction Generator ◽  
Flux Control ◽  
Mode Control ◽  
Doubly Fed

In this paper, a novel voltage control strategy of stand-alone operation brushless doubly fed induction generator for variable speed constant frequency wind energy conversion systems was presented and discussed particularly. Based on the model of the generator power system, the proposed direct flux control strategy employs a nonlinear reduced-order generalized integrator based resonant sliding-mode control scheme to directly calculate and regulated the output value of converter which control winding stator required so as to eliminate the instantaneous errors of power winding stator flux, and no involving any synchronous rotating coordinate transformations. The stability, robustness and convergence capability of the proposed control strategy were described and analyzed. Owing to no extra current control loops involved, therefore simplifying the system configuration design and enhancing the transient performance. Constant converter switching frequency was achieved by using space vector pulse width modulation, which reduce the harmonic of generator terminal voltage. In addition, experimental results prove the feasibility and validity of the proposed scheme, and excellent steady and dynamic state performance is achieved.

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