Abstract

The control of machines in case of low carrier ratio (ratio of switching frequency to electrical frequency f sw /f el ) is a challenging topic at the highly dynamic control of high-speed machines and high power converters. While common PI Controllers face stability issues at low ratios, Model Predictive Control (MPC) can be used to ensure stability. The cost function can be used, to reduce the Total Harmonic Distortion of the motor currents (THD i ) or, keeping the THD i constant, reducing the motor filter size. This paper presents a comparison of Finite Control Set (FCS) and hysteresis based MPC algorithm for three level converter. The predictive control of the currents is providing good dynamic performance. The Neutral Point Clamped (NPC) or T-Type converter are considered to optimize the harmonic distortion of the permanent magnet synchronous motor (PMSM) currents. Simulation and experimental results prove the effectiveness of the analyzed control for 3-Level Converters.

Highlights

  • Low carrier ratio, meaning low ratio of switching frequency to electrical frequency is a challenging topic for applications like high-speed drives, or high power drives [1].In the industry, for electrical drive applications a cascaded field-oriented control (FOC) is commonly used

  • The cost function can be used to optimize performance, losses, or increase robustness, but raises high computational requirements, for example shown for Finite Control Set (FCS) Model Predictive Control (MPC) in [3]

  • That for the Converter and permanent magnet synchronous motor (PMSM) shown in I and II, the Neutral Point Clamped (NPC) has a lower rating, 0.438MVA compared to 0.468MVA for the T-Type

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Summary

INTRODUCTION

Low carrier ratio, meaning low ratio of switching frequency to electrical frequency (fel/fS) is a challenging topic for applications like high-speed drives, or high power drives [1]. Model predictive control offers the possibility to reduce the effective switching frequency of the converter while maintaining fast dynamic response, and good steady-state performance, which is important assuming a cascaded control structure [2]. Deadbeat predictive control can be used to null the control error after a predefined number of switching periods and obtains very good dynamic performance. In [4] modulation and predictive current control for low switching frequencies are shown.

SYSTEM DESCRIPTION
FINITE CONTROL SET MODEL PREDICTIVE CONTROL
SIMULATION RESULTS
Power semiconductor rating
EXPERIMENTAL RESULTS
CONCLUSION
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