Abstract
The traditional direct torque control (DTC) method will produce a larger harmonic current in the x, y subspace when applied to a dual three-phase permanent magnet synchronous machine (DTP-PMSM) because the voltage vector used for DTC is not equal to zero in the x, y harmonic subspace. To mitigate this problem, in this manuscript, a model predictive direct torque control (MPDTC) method is proposed to eliminate the harmonic current in DTP-PMSM. The spatial distribution characteristic DTP-PMSM voltage vector is analyzed; then, the table of vector group can be obtained according to DTC, and each vector group can be combined to obtain the zero-voltage vector in the x, y subspace. According to the cost function, MPDTC selects the vector group and obtains the optimal vector sequence combination to eliminate the harmonic current in the x, y subspace. Furthermore, the MPDTC achieves closed-loop control of harmonic currents in the x, y subspace. The MPDTC can also eliminate harmonic currents caused by other factors. The simulation results show that the method of MPDTC can effectively suppress the harmonic current of DTP-PMSM.
Highlights
Mathematical Problems in Engineering with Model predictive control (MPC) for harmonic current suppression to achieve better dynamic performance and robustness when motor parameters change
According to the distribution characteristics of the four amplitude vectors of DTP-PMSM, a virtual vector with a zero amplitude in the x, y subspace is synthesized in advance to perform MPC to suppress harmonic currents [16,17,18]. e virtual vector MPC (VVMPC) method proposed in [16] uses the largest and the second amplitude vector of α, β subspace to synthesize 12 virtual vectors with a zero amplitude in the x, y subspace
E contributions of this paper are summarized below: A new method of model predictive direct torque control (MPDTC) combining direct torque control (DTC) and MPC is proposed. e proposed method uses the vector table of DTC to reduce the number of prediction vectors from 12 to 3, which reduces the computational workload of MPC
Summary
Mathematical Problems in Engineering with MPC for harmonic current suppression to achieve better dynamic performance and robustness when motor parameters change. According to the distribution characteristics of the four amplitude vectors of DTP-PMSM, a virtual vector with a zero amplitude in the x, y subspace is synthesized in advance to perform MPC to suppress harmonic currents [16,17,18].
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