Abstract
Conventional finite control set model-predictive control (FCS-MPC) presents a high computational burden, especially in three-level neutral-point-clamped (NPC) converters. This article proposes a low-complexity optimal switching time-modulated model-predictive control (OST-M2PC) method for a three-level NPC converter. In the proposed OST-M2PC method, the optimal switching time is calculated using a cost function. Compared with the conventional FCS-MPC, the proposed OST-M2PC method has a fixed switching frequency as well as better power quality. The proposed OST-M2PC can operate at a 20-kHz sampling frequency, reducing the computational burden of the processor. Simulation and experimental results validate the operation of the proposed method.
Highlights
Permanent magnet synchronous motors (PMSMs) have been widely used in fields of high-performance servo systems and other industrial applications, due to high efficiency, high power density and other advantages [1]
The PI control method is often adopted as the current control method for PMSMs [2]
In order to reduce computation burden of the processor and have a fixed switching frequency to improve harmonic spectrum, a low-complexity optimal switching time modulated model predictive control (OST-M2PC) method for a three-level neutral point clamped (NPC) converter is proposed in this paper
Summary
Permanent magnet synchronous motors (PMSMs) have been widely used in fields of high-performance servo systems and other industrial applications, due to high efficiency, high power density and other advantages [1]. In [11], a FCS-MPC method based on predictive voltage control for a three-level NPC converter was proposed to reduce the computational time of the processor This proposed method has two steps: firstly, the predictive voltage calculation instead of current prediction; Secondly, a reduced number of cost function calculations. In this way, the computation burden of processor is reduced while maintaining the same control performance as conventional FCS-MPC. In order to reduce computation burden of the processor and have a fixed switching frequency to improve harmonic spectrum, a low-complexity optimal switching time modulated model predictive control (OST-M2PC) method for a three-level NPC converter is proposed in this paper.
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