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JEET, Vol. 13, No. 6, November 2018
Differential Evolution Approach for Performance Enhancement of Field-Oriented PMSMs
Han Ho Choi
Area B - Electric Machinery and Power Electronics
Abstract In a field-oriented vector-controlled permanent magnet synchronous motor (PMSM) control system, the d-axis current control loop can offer a free degree of freedom which can be used to improve control performances. However, in the industry the desired d-axis current command is usually set as zero without using the free degree of freedom. This paper proposes a method to use the degree of freedom for control performance improvement. It is assumed that both the inner loop proportionalintegral (PI) current controller and the q-axis outer loop PI speed controller are tuned by the wellknown tuning rules. This paper gives an optimal d-axis reference current command generator such that some useful performance indexes are minimized and/or a tradeoff between conflicting performance criteria is made. This paper uses a differential evolution algorithm to autotune the parameter values of the optimal d-axis reference current command generator. This paper implements the proposed control system in real time on a Texas Instruments TMS320F28335 floating-point DSP. This paper also gives experimental results showing the practicality and feasibility of the proposed control system, along with simulation results.
Keyword Permanent magnet synchronous motor (PMSM),Field-oriented control,Speed control,Proportional-integral (PI) control,Differential evolution (DE).
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