Pub Date : 2022-03-22DOI: 10.1109/IC_ASET53395.2022.9765867
L. Fekih-Ahmed
We describe a new constructive method of approximation of analogue functions in CMOS. The method relies on the theories of Bürmann expansion and interpolation using Lagrange generalized polynomials: any real differentiable function can be synthesized in a unique way as a linear combination of the powers tanhn(x). We give the exact formulas for the coefficients involved in the linear combination. SPICE simulations confirm the method through a linear (linearized transconductor), squaring, cube, exponential and bump circuit four-quadrant function approximator.
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Pub Date : 2022-03-22DOI: 10.1109/IC_ASET53395.2022.9765917
Ines Zgarni, L. El Amraoui
This work deals with the development of vector control of Doubly Fed Induction Generator (DFIG) based Wind Turbine system. The dynamic modeling of studied system is described, firstly, according to stationary reference frame αβ and then according to synchronous reference frame dq. Moreover, the wind turbine modeling is evoked by resorting of Maximum Power Point Tracking (MPPT) approach based on indirect speed control. However, the control strategy focuses mainly on the implementation of Rotor-Side Converter (RSC) control employing rotor current control loops and speed and power control loops in order to regulate the electromagnetic torque and the reactive power exchanged between the stator and the grid. The studied system is tested and simulated for both super-synchronous and sub-synchronous wind speed using Sim Power System Simulink of MATLAB to prove the effectiveness of proposed vector control strategy.
本文研究了基于双馈感应发电机(DFIG)的风力发电系统矢量控制的发展。首先根据静止参照系αβ，然后根据同步参照系dq对所研究的系统进行了动力学建模。采用基于间接速度控制的最大功率点跟踪(MPPT)方法对风力机进行建模。然而，控制策略主要侧重于实现转子侧变流器(RSC)控制，采用转子电流控制回路和速度和功率控制回路来调节电磁转矩和定子与电网之间交换的无功功率。利用MATLAB中的Sim Power system Simulink对所研究的系统进行了超同步和亚同步风速的测试和仿真，验证了所提出的矢量控制策略的有效性。
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Pub Date : 2022-03-22DOI: 10.1109/IC_ASET53395.2022.9765872
Md. Rasedul Islam
The trajectory generation ensuring uniform velocity and reduced-jerk is desired for rehabilitation robots. However, this requirement is largely overlooked in the research of rehabilitation robotics. Most research prototypes of existing rehabilitation robots used a cubic polynomial approach in which sudden and large acceleration changes have occurred at the start and the end of the trajectory, which causes theoretically infinite jerk. Moreover, the cubic polynomial approach cannot maintain uniform velocity during the robot's maneuvering. To bridge this gap, in this research, a blended (i.e., hybrid) scheme using fifth-order polynomial at the start and the end of the trajectory and a linear segment in between the polynomials is proposed to generate trajectories for rehabilitation robots. The trajectory generated using the proposed scheme shows no sudden change in acceleration and reduced jerk compared to the cubic polynomial approach.
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