科研之友
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摘要
In this paper, a direct torque control using a four-dimensional switching-table (4D-ST) is proposed for the voltage source inverter-permanent magnet synchronous motor drive system. The proposed strategy takes a number of virtual vectors, of which magnitude and angle can be configured freely, as candidate vectors. By taking advantage of the variety of the virtual vector, the proposed strategy can obtain superior steady-state and dynamic performance. To choose the optimal vector from all of virtual vectors, first quantify the change rule of the torque and stator flux generated by each different virtual vector, and then take the magnitude and angle of the virtual vector, stator flux angle, and the quantificational factor as four dimensions to establish 4D-ST; by analyzing the distributed laws of quantificational factors in 4D-ST, we can compress 4D-ST and propose a quarter selector to choose the optimal vector accurately and rapidly. By taking the step function instead of the hysteresis comparator as the torque and flux controller, the direct torque control using 4D-ST can be realized. Finally, numerical simulations and experiments with prototype are carried out to validate the feasibility and effectiveness of the proposed strategy.
