ABSTRACT

In this paper, an improved hysteresis-switching table-based current regulation for the field-oriented control (FOC) drive is designed. The control structure of the proposed scheme is similar to the direct torque control (DTC) scheme; therefore, it is named as the hybrid torque and flux control (HTFC) scheme. Conventional HTFC strategy suffers from high current ripple, due to its inefficiency in the selection of optimised switching voltage vectors from the switching table, while limiting d- and q-axes current errors within the hysteresis bands. This is because of the restricted availability of voltage vectors for two-level inverter drive control. To overcome the above problems, the switching table of the HTFC scheme is modified to incorporate intermediate voltage vectors, based on (a) rate of change in q-axis current error, (b) the four-level hysteresis controller state of the q-axis current error, and (c) the two-level hysteresis controller state of the d-axis current error. This proposed Mutated Switching Table – HTFC (MST-HTFC) scheme intends to increase the controllability over stator current component errors, and thus limiting the current ripple. The effectiveness of the MST-HTFC scheme over the HTFC scheme is verified using a 1 kW induction motor drive in simulation through MATLAB and validated experimentally.

摘要

在本文中，为磁场定向控制 (FOC) 驱动器设计了一种改进的基于磁滞开关表的电流调节。所提出方案的控制结构类似于直接转矩控制（DTC）方案；因此，它被命名为混合扭矩和磁通控制（HTFC）方案。传统的 HTFC 策略存在高电流纹波，因为它在从开关表中选择优化的开关电压矢量时效率低下，同时将 d 轴和 q 轴电流误差限制在滞后带内。这是因为用于两电平逆变器驱动控制的电压矢量的可用性有限。为了克服上述问题，根据 (a) q 轴电流误差的变化率，对 HTFC 方案的切换表进行了修改，以包含中间电压矢量，(b) q 轴电流误差的四级磁滞控制器状态，和 (c) d 轴电流误差的两级磁滞控制器状态。该提议的突变开关表 - HTFC (MST-HTFC) 方案旨在提高对定子电流分量误差的可控性，从而限制电流纹波。使用 1 kW 感应电机驱动器通过 MATLAB 仿真验证 MST-HTFC 方案相对于 HTFC 方案的有效性，并通过实验验证。