An Accurate Design Method for Ipmsm Current Loop Bandwidth Considering Digital Delays

Le résumé fourni par la source

In the high-power or high-speed permanent magnet synchronous motor drive system, the complex vector current regulator in the motor parameter mismatch and low carrier ratio conditions have shown excellent control performance, the traditional design of the complex vector current regulator in order to simplify the design process does not take into account the effect of the delay of the digital control system, resulting in the preset current loop bandwidth and the actual current loop bandwidth is distorted, relying on the preset current loop bandwidth of the design of the current regulator parameters can not make the current control effect as expected. The current regulator parameters designed based on the preset current loop bandwidth cannot make the current control effect reach the expectation. To this end, under the premise of fully considering the complex vector current regulator, the motor and the digital delay link, the Euler formula is used to expand the delay link in the frequency domain, and the current loop closed-loop transfer function is reconstructed by relying on the two important parameters of the current loop bandwidth and digital delay, and the algebraic relationship between the controller parameters and the current loop bandwidth and the digital delay is derived through the closed-loop transfer function, so as to propose an algebraic relationship between the controller parameters and the digital delay, and thus the design precision of the complex vector current regulator can be improved by the current loop bandwidth. Based on this, a complex vector current regulator parameter tuning method that can improve the design accuracy of the current loop bandwidth is proposed. The effectiveness of the proposed scheme is verified by both simulation and experiment.

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