Abstract：An output voltage vector which has adjustable amplitude has been synthesized with the selected voltage vector of an effectiveness and a zero by calculating the duty cycle in the two-vector model prediction torque control, which can effectively reduces the value error of actual and design. But due to the limited selection range, there are still some defects. Thus some three-vector improvement measures have been proposed which have different selection methods. Based on the new two-vector model prediction torque control, a three-vector model prediction torque control strategy based on the fast selection table is proposed. A synthetic voltage vector with adjustable amplitude and range is obtained by increasing the effective voltage vector, and a fast selection table is proposed to reduce the computation of the effective voltage vector selection. Firstly, by analyzing the influence of the voltage vectors on the slope of torque and stator flux in turn, it can be known that the zero voltage vector mainly affects the torque ripples, while the influence on the stator flux is almost negligible. Therefore, the slope of stator flux under zero voltage vector is not needed to be considered in the operation time allocation. Secondly, the fast selection table is constructed according to the effect of effective voltage vector on torque and stator flux, so that the prediction times can be greatly reduced during the selection of effective voltage vector. Then, the sector judgment is made according to the position of stator flux at the current time, and the effective voltage vector is selected quickly according to the torque value error of actual and design and the value of sectors in the fast selection table. Finally, the operating time of voltage vectors are calculated by the principle of deadbeat control. The simulation test mainly verifies the transient experiment. Firstly, the motor speed is set at 1500r/min and started in no-load state, then when the motor run stably to 1500r/min, the simulation test condition of load torque is suddenly added to 3N·m at 0.1s. Simulation waveform shows that this strategy can effectively reduce flux fluctuation and torque ripples on the virtual platform, and suppress current harmonics to some extent which the current harmonics reduce from 13.27% to 6.77%. In order to further verify the feasibility of the algorithm, a relevant experimental platform is built for experimental verification, which is mainly divided into two parts: steady-state experiment and transient experiment verification. The steady-state experiment mainly verifies the operation condition of the motor under the two conditions of low-speed with no-load and high-speed with load. The torque ripples and flux fluctuation can be effectively improved to a certain extent under both conditions, and the current harmonics under the condition of high-speed with load are reduced from 32.37% to 25.68%. The transient experiment is to suddenly add load to the motor under the condition of stable operation. Both experiments show that the control strategy in this paper has more obvious improvement, which can reduce current harmonics at the same time, and the steady-state performance is obviously better. In addition, when the torque changes, although the speed will be affected to some extent, the results will be less affected and the dynamic response can be maintained quickly.
兰志勇, 罗杰, 李延昊, 李超, 李福. 基于快速选择表的永磁同步电机模型预测转矩控制[J]. 电工技术学报, 0, (): 82-82.
Lan Zhiyong, Luo Jie, Li Yanhao, Li Chao, Li Fu. Model prediction torque control for Permanent Magnet Synchronous Motor Based on the Fast Selection Table. Transactions of China Electrotechnical Society, 0, (): 82-82.
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