Control predictivo basado en secuencia de conmutación óptima para un conversor de tres puertos aplicado a vehículos eléctricos
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Date
2024
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Abstract
Multi-port power converters have a very important role today because they are used used in electromobility applications and hybrid energy storage systems (HESS). However, their optimal operation requires advanced control techniques due to the handling of multiple variables simultaneously. This thesis presents the development of an Optimal Switching Sequence (OSS) model predictive control (MPC) method applied to a three-port converter (TPC), which has been connected to an anisotropic permanent magnet synchronous machine (PMSM) and two dc voltage sources (VS). Based on a review of TPCs, classical control methods and MPC methods, the converter used with its mathematical formulation is presented. Then, theoretical principles of vector modulation and the machine for the design of the current controller are presented. The latter is based on two steps, the first one uses the dynamic model of the machine to find the optimal seven-segment
witching sequence (7S-SS) that reduces the value of an objective function without using weighting factors and the second one uses the redundant vectors (zero vectors) optimally distributed to control the current in another of the ports.The results validate the method by experimental and simulation tests. The strategy presents a defined harmonic distortion, without sacrificing the dynamic response. In addi tion, an implementation with asymmetric modulation reduces the tracking error by 65.36% and a delay compensation reduces it by 92%. Furthermore, the new strategy manages to reduce the optimization problems to be solved by the steady-state algorithm from 6 to 1. Thus, the proposed control becomes attractive for implementation in real hybrid sys tems, which impose challenges of durability, versatility and reliability to the electrical system.
Description
Tesis (Magíster en Ciencias de la Ingeniería)--Pontificia Universidad Católica de Chile, 2024
Keywords
Optimal Switching Sequence (OSS), Model Predictive Control (MPC), Multiport Converters, Electric Vehicle (EV), Hybrid Power Integration, Power Converters, Vector Control, Field Oriented Control (FOC), Permanent Magnet Synchronous Machine (PMSM)