摘 要
柔性直流输电系统（VSC-HVDC）作为现代电力电子技术与电网控制技术的结合，为可再生能源接入和灵活电网运行提供了重要支撑。本文针对柔性直流输电系统的控制策略与运行特性展开研究，旨在解决多端直流网络中功率分配、动态响应及稳定性优化等关键问题。研究基于改进的下垂控制方法，提出了一种适用于复杂工况的自适应功率协调控制策略，通过引入虚拟惯性环节增强了系统的暂态稳定性能，并结合分布式通信技术实现了多端系统的高效协同控制。同时，利用时域仿真分析了不同运行场景下的系统动态特性，验证了所提方法在功率快速调节与故障恢复中的有效性。此外，本文还探讨了换流器拓扑结构对系统损耗的影响，并提出了优化设计建议。研究结果表明，所提出的控制策略能够显著提升柔性直流输电系统的运行灵活性与可靠性，为实际工程应用提供了理论依据和技术支持，具有重要的学术价值与实践意义。
关键词：柔性直流输电系统；下垂控制；自适应功率协调；暂态稳定性能；换流器拓扑优化
Abstract
The voltage source converter-based high-voltage direct current (VSC-HVDC) system, as an integration of modern power electronics and grid control technologies, plays a crucial role in facilitating renewable energy integration and enabling flexible grid operation. This paper investigates the control strategies and operational characteristics of VSC-HVDC systems, addressing key challenges such as power distribution, dynamic response enhancement, and stability optimization in multi-terminal DC networks. Based on an improved droop control method, an adaptive power coordination control strategy suitable for complex operating conditions is proposed, which enhances transient stability performance by incorporating a virtual inertia component. Furthermore, the strategy leverages distributed communication technology to achieve efficient collaborative control in multi-terminal systems. The dynamic behavior of the system under various operating scenarios is analyzed through time-domain simulations, validating the effectiveness of the proposed method in rapid power regulation and fault recovery. Additionally, this study examines the impact of converter topology on system losses and provides optimization design recommendations. The results demonstrate that the proposed control strategy significantly improves the operational flexibility and reliability of VSC-HVDC systems, offering theoretical support and technical guidance for practical engineering applications, with important academic significance and practical implications.
Keywords: Flexible Dc Transmission System；Droop Control；Adaptive Power Coordination；Transient Stability Performance；Converter Topology Optimization
目 录
摘 要 I
Abstract II
一、绪论 1
（一）柔性直流输电系统研究背景与意义 1
（二）国内外研究现状分析 1
（三）本文研究方法与技术路线 2
二、柔性直流输电系统控制策略研究 2
（一）控制策略的基本原理 2
（二）基于模型预测的控制方法 3
（三）控制策略的优化设计 3
三、柔性直流输电系统的运行特性分析 4
（一）系统动态响应特性研究 4
（二）不同工况下的运行特性评估 4
（三）运行特性的仿真验证 5
四、柔性直流输电系统的稳定性与协调控制 5
（一）系统稳定性分析方法 5
（二）协调控制策略的设计与实现 6
（三）实际工程应用案例分析 6
结 论 7
致 谢 8
参考文献 9
