基于空间矢量调制的异步电机直接转差线性控制(英文)

Direct Slip Linear Control of Induction Motor Based on Space Vector Pulse Width Modulation

由于直接转矩控制策略对定子磁链和电磁转矩采取非线性滞环控制,电机的电磁转矩、磁链幅值、相电流存在稳态误差。该文提出基于空间矢量调制的异步电机直接转差线性控制策略(direct slip linear control based on space vector modulation,DSLC-SVM)。该策略不含坐标变换,无电流环,只需辨识定子磁链。与传统直接转矩控制策略相比,由于对转差进行直接线性控制,DSLC-SVM策略可以减小转矩和磁链误差,降低相电流的总谐波失真(total harmonic distortion,THD)。比较了2种控制策略改变转差的能力,通过对比实验,验证了该文所提算法的正确性和可行性。

As nonlinear hysteresis control of stator flux and torque in direct torque control （DTC） algorithm, during steady state, notable torque, flux and current pulsations occur. In this paper, an induction motor direct slip linear control based on space vector modulation （DSLC-SVM） is proposed. DSLC-SVM algorithm is characterized by requiring no coordinate transformation and no current regulator, only need to measure the stator flux. Compared with the traditional DTC, as the slip using direct linear control, DSLC-SVM can reduce torque ripple and flux magnitude deviation, lower the THD of stator current. The abilities of traditional DTC and DSLC-SVM to change slip are calculated and compared. Comparative experiments prove the validity and feasibility of the proposed method.