Model predictive control with a novel cost function evaluation scheme for OW‐PMSM drives

Abstract

In open-winding permanent magnet synchronous motor (OW-PMSM) system, the voltage vectors (VVs) produced by the dual-inverter are abundant and one VV may correspond to different switching states. It is time-consuming for model predictive control strategy to evaluate the cost function with all VVs and select the optimal switching states. A novel cost function evaluation scheme is proposed in this Letter and the evaluation times of the cost function is significantly reduced. The optimal switching states of each phase are decided by evaluating the cost function with six virtual vectors and a zero vector and the switching states of each phase are directly decided without additional evaluation process. The calculation time is significantly reduced with the proposed strategy and the steady-state performance of the OW-PMSM system is maintained similar to the conventional strategy. Experimental results have validated the effectiveness of the proposed strategy.

A Rotor Position Detection Method for Permanent Magnet Synchronous Motors Based on Variable Gain Discrete Sliding Mode Observer

“…where λ pm is the permanent magnet magnetic chain, ω max and ω min are the maximum and minimum electrical angular velocities during motor operation [23], x f is the low-pass filter state parameter; K f is the low-pass filter gain, and the expression is as follows:…”

A Study of Cost Function Selection in Model Predictive Control Applications

“…El voltaje de salida está sintetizado como una función de los semiconductores de conmutación del inversor y el voltaje del enlace DC v dc , como se muestra en la ecuación (2).…”

“…Una de las principales características del control predictivo es que puede controlar múltiples objetivos, debido a que se puede agregar condiciones y términos adicionales en la función de costo. Últimamente, se han desarrollado varias funciones de costo para distintos requerimientos en los convertidores de potencia, tal como control de los vectores de voltaje en coordenadas dq [1], control de flujo del estator [2], control de la potencia reactiva [3], control de la corriente en coordenadas dq [4], entre otros. En el siguiente paper se presentan distintas formas de implementar la función de costo y distintos términos usados para evaluar diferentes requerimientos u objetivos de control.…”