二极管箝位型多电平矩阵变换器拓扑和控制策略研究

For the fact that the conventional matrix converter topology is not suitable for high voltage and high power applications, this project is dedicated to investigate a diode-clamped multi-level matrix converter and its derived topologies, as well as the related modulation strategies, fault detection and fault-tolerant strategies. Based on the diode-clamped three-level matrix converter, other feasible multi-level topologies are derived by combining the multi-level inverter technology. Both the space vector modulation and the carrier-based modulation strategies for the proposed topologies are studied, and the intrinsic relationship between them are revealed. Then, by building the mathematical expressions between the modulation strategy and the related performance indexes, such as input and output power quality, system efficiency, output common-mode voltage, reactive power compensation capability, and device loss distribution, a single or multi-objective optimization modulation strategy will be presented consequently for specific demand. To ease the computational burden, a finite set based predictive control with reduced solution-space is proposed with the help of the modulation rules of matrix converter. To improve the reliability, robust fault detection strategies and fault-tolerant schemes for multi-level matrix converters are presented. Furthermore, the transient processes of the converter commutation loops are analyzed, which helps to optimize system design, and then a low-power lab prototype is set up to confirm the validity of the proposed topologies and algorithms. This project will provide the theoretical basis and key technology support for the development of multi-level matrix converter, expand the converter family of medium or high voltage frequency conversion, and offer new ideas for developing and utilizing the new energy, together with the energy-saving technologies.

针对传统矩阵变换器拓扑不适于中高压大功率应用的问题,本项目拟研究二极管箝位型多电平矩阵变换器及其衍生拓扑、调制策略和故障诊断与容错控制。以二极管箝位型三电平矩阵变换器为基础,推演其它拓扑结构。研究各拓扑的空间矢量调制和载波调制策略,并揭示二者内在联系；在建立调制策略与输入、输出电能质量，系统效率，共模电压，无功补偿能力和器件损耗分布等性能指标的数学关系的基础上，提出单目标或多目标优化调制策略。针对多电平矩阵变换器解空间大的问题，结合矩阵变换器的经验规则，提出基于简化解空间的有限集预测控制策略。针对系统可靠性问题，提出针对多电平矩阵变换器的鲁棒故障诊断和容错控制方法。研究电路换流环路及其暂态过程，优化系统设计，构建原型样机，验证方案的合理性。该项目的实施将为多电平矩阵变换器的发展提供理论基础和关键技术支持，为中高压变频家族增添新成员和注入新的活力，为新能源的开发以及节能技术的应用提供新思路。