Nguyen Anh Tuan, Rafaq Muhammad Saad, Choi Han Ho, Jung Jin-Woo
Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, South Korea.
Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, South Korea.
ISA Trans. 2021 Apr;110:305-318. doi: 10.1016/j.isatra.2020.10.047. Epub 2020 Oct 16.
This paper investigates an observer-based deadbeat predictive speed controller (DBPSC) for a prototype surface-mounted permanent magnet synchronous motor (SPMSM) drive system. Unlike the conventional deadbeat controllers which are mainly used for deadbeat current control in the inner loop in a cascaded control structure, the proposed deadbeat controller is designed by incorporating a speed controller with a load torque disturbance observer. Specifically the proposed deadbeat speed control law consists of a deadbeat stabilizing feedback control term and a compensation control term. The stability of the proposed closed-loop system is assured based on the former term by forcing all poles of the dynamic error vector toward the origin within a short transient time, which guarantees a fast transient response of the control system by using the solution of an optimal control problem. The latter term is proposed based on the predicted q-axis current to compensate for the model nonlinearities and parameter uncertainties. Next, the deadbeat load torque observer (DBLTO) is proposed to provide a precisely estimated load torque with a high estimation rate for the predicted q-axis current in the latter term, which helps the proposed scheme in obtaining a small steady-state error (SSE), a low total harmonic distortion (THD), and robustness against the parameter variations. In addition, the proposed scheme possesses a simple structure, so it reduces the computational burden for digital implementation. The Lyapunov theory is utilized in the stability proof process of the proposed observer-based method. Finally, the comparative studies between the proposed DBPSC and a conventional deadbeat speed controller (DBSC) are performed under the sudden changes of speed and load torque through simulations on MATLAB/Simulink and experiments on a prototype SPMSM drive using a TI TMS320F28335 DSP platform.
本文研究了一种基于观测器的无差拍预测速度控制器（DBPSC），用于原型表面贴装永磁同步电机（SPMSM）驱动系统。与传统的无差拍控制器主要用于级联控制结构内环的无差拍电流控制不同，所提出的无差拍控制器是通过将速度控制器与负载转矩扰动观测器相结合来设计的。具体而言，所提出的无差拍速度控制律由无差拍稳定反馈控制项和补偿控制项组成。基于前一项，通过在短暂态时间内迫使动态误差向量的所有极点趋向原点，确保了所提出闭环系统的稳定性，这通过最优控制问题的解保证了控制系统的快速暂态响应。后一项基于预测的q轴电流提出，以补偿模型非线性和参数不确定性。接下来，提出了无差拍负载转矩观测器（DBLTO），以便为后一项中的预测q轴电流提供具有高估计率的精确估计负载转矩，这有助于所提出的方案获得小稳态误差（SSE）、低总谐波失真（THD）以及对参数变化的鲁棒性。此外，所提出的方案结构简单，因此降低了数字实现的计算负担。在所提出的基于观测器的方法的稳定性证明过程中利用了李雅普诺夫理论。最后，通过在MATLAB/Simulink上进行仿真以及在使用TI TMS320F28335 DSP平台的原型SPMSM驱动器上进行实验，在所提出的DBPSC与传统无差拍速度控制器（DBSC）之间进行了速度和负载转矩突然变化情况下的对比研究。
