摘 要
高压直流输电技术作为现代电力系统中的关键组成部分，对于实现远距离、大容量电力传输具有重要意义，而多电平逆变器的引入为提升其性能提供了新的解决方案本研究以多电平逆变器为基础，针对高压直流输电系统的拓扑结构优化、控制策略改进及运行特性分析展开深入探讨旨在提高系统的效率、可靠性和电能质量研究中采用模块化多电平换流器MMC作为核心架构，并结合先进的调制算法和控制方法，通过理论推导、仿真建模与实验验证相结合的方式，对系统动态响应、损耗分布及谐波特性进行了全面评估结果表明，所提出的多电平逆变器方案能够显著降低开关损耗，同时有效抑制谐波畸变，提升了系统的整体性能此外，本研究还提出了一种基于自适应预测控制的新型调节策略，进一步增强了系统的稳定性和适应性总体而言，该研究不仅为高压直流输电技术的发展提供了理论支持，还在多电平逆变器的实际应用方面展现了重要价值，为未来相关技术的工程化实施奠定了坚实基础
关键词：高压直流输电；多电平逆变器；模块化多电平换流器
ABSTRACT
High-voltage direct current (HVDC) transmission technology, as a critical component of modern power systems, plays a significant role in enabling long-distance and high-capacity power transmission, while the introduction of multilevel inverters offers a novel solution to enhance its performance. This study focuses on the topology optimization, control strategy improvement, and operational characteristic analysis of HVDC transmission systems based on multilevel inverters, aiming to improve system efficiency, reliability, and power quality. A modular multilevel converter (MMC) is employed as the core architecture, integrated with advanced modulation algorithms and control methods. Through a combination of theoretical derivation, simulation modeling, and experimental validation, a comprehensive evaluation of the system's dynamic response, loss distribution, and harmonic characteristics is conducted. The results indicate that the proposed multilevel inverter scheme can significantly reduce switching losses while effectively suppressing harmonic distortion, thereby enhancing the overall system performance. Additionally, this research proposes a new regulation strategy based on adaptive predictive control, further improving the system's stability and adaptability. Overall, this study not only provides theoretical support for the development of HVDC transmission technology but also demonstrates significant value in the practical application of multilevel inverters, laying a solid foundation for the future engineering implementation of related technologies.
KEY WORDS： High Voltage Direct Current Transmission;Multi-Level Inverter;Modular Multilevel Converter
目 录
摘 要 I
ABSTRACT II
1 绪论 1
1.1 高压直流输电技术的研究背景 1
1.2 多电平逆变器在高压直流中的意义 1
1.3 国内外研究现状与发展趋势 2
2 多电平逆变器的拓扑结构分析 2
2.1 多电平逆变器的基本原理 2
2.2 常见多电平逆变器拓扑对比 3
2.3 拓扑结构对高压直流输电的影响 4
3 控制策略与调制技术研究 4
3.1 高压直流输电的控制需求分析 5
3.2 多电平逆变器的调制技术优化 5
3.3 控制策略对系统性能的提升作用 6
4 系统建模与仿真验证 7
4.1 高压直流输电系统的数学模型 7
4.2 多电平逆变器的仿真设计与实现 7
4.3 仿真结果分析与性能评估 8
结论 9
致 谢 10
参考文献 11
