开绕组永磁同步电机全速域优化模型预测控制研究

This project aims at the electric traction system with limited power source and studies the enhanced model predictive control strategy of the dual converter driven open winding permanent magnet synchronous motor (PMSM) system over full speed range. Specifically focus on: the simplified model predictive control strategy for the dual converter system considering its special features, the enhanced model predictive control strategy with multiple restrictions coordination, over modulation technology and field weakening strategy based high efficiency model predictive strategy. This project will break through the traditional theoretical framework of the well-known vector control and direct torque control strategy, it combines the multiple restrictions of the dual inverter system with the multiple objectives of the open winding permanent magnet synchronous machine system under different operation conditions. Moreover, rather than simply transplanting the conventional model predictive control strategy on the permanent magnet synchronous machine system, this project innovatively introduces the model predictive control and optimization theory and transforms the multiple restrictions and control objectives into the predictive optimum problems, which could be flexibly coordinated according to the different control targets. Meanwhile, the optimal model predictive control strategy is extended to the field weakening region at high speed to obtain higher efficiency, better control performance, more flexible operation mode and higher reliability over broader speed operation range. This project is of great academic significance for upgrading the existing motor drive control strategy of open winding permanent magnet synchronous machine and popularization of the model predictive control strategy. It also has great industrial significance for providing effective and feasible control schemes and drive system for the electric traction system that has limited power source.

本项目以有限电源条件下电力牵引系统为应用背景，对开绕组永磁同步电机双变换器系统在全速域范围内的优化模型预测控制进行研究。主要包括考虑双变换器开绕组永磁同步电机系统特性的简化模型预测控制、多约束条件协调的优化模型预测控制、基于过调制和弱磁控制的高效模型预测控制等。本项目的研究突破了开绕组电机基于矢量控制和直接转矩控制的传统理论框架，也非传统模型预测控制的简单移植，而是结合双变换器系统特有问题和多种约束及开绕组永磁同步电机不同工况下的多控制目标，创新性地将模型预测控制思想引入并优化，将系统的多约束和控制目标转化为预测优化问题，并对不同目标进行有效协调，以获全速域内的更优控制性能、更灵活运行方式和更高运行效率。本项目的研究对推进开绕组电机系统理论体系的完善和模型预测控制理论研究的深化有重要学术意义，同时为有限电源下电力牵引系统提供了有效可行的电机系统及控制的关键技术，具有重要工程现实意义。

本项目以有限电源条件下电力牵引系统为应用背景，对开绕组永磁同步电机双变换器系统在全速域范围内的优化模型预测控制进行研究。主要包括考虑了双变换器开绕组永磁同步电机系统特性的简化模型预测控制、多约束条件协调的优化模型预测控制以及基于弱磁控制的模型预测控制。针对开绕组系统执行模型预测控制时因电压矢量众多而导致的寻优过程冗余的问题，提出了结合双逆变器特性的简化模型预测控制方案，显著降低了模型预测控制算法在开绕组系统中的执行时间。为了解决单个电源供电情况下开绕组拓扑中存在的多约束控制难题，提出了具备多约束处理能力的优化模型预测控制方案，实现了零序电流、电容电压与电机转矩、磁链的有效协同控制。承接基速以下的开绕组永磁同步电机模型预测控制优化方案，进一步提出了模型预测控制弱磁方案，提高了开绕组永磁同步电机在基速以上的运行能力和控制灵活性，形成了全速域统一的优化模型预测控制方案。本项目的研究对推进开绕组电机系统理论体系的完善和模型预测控制理论研究的深化有重要学术意义，同时为有限电源下电力牵引系统提供了有效可行的电机系统及控制的关键技术，具有重要工程现实意义。