基于小干扰稳定性的多端混合高压直流输电系统控制参数分析与优化方法

Control Parameter Analysis and Optimization Method of Multi-terminal Hybrid HVDC Transmission System Based on Small Signal Stability

多端混合直流输电技术综合了电网换相换流器与模块化多电平换流器的优势,是当前直流输电的研究热点之一。采用小干扰稳定性分析方法,可以从数学层面上对多端混合高压直流系统进行参数分析。然而,由于多端混合高压直流输电系统含有多个含有复杂控制器的MMC换流站,模型更为复杂,涉及控制参数众多,缺少便捷的工具进行研究,其控制参数对系统影响分析结果尚不明晰。为此,提出了一套基于小干扰稳定性分析的多端混合高压直流输电系统参数分析与优化方法,该方法可实现基于状态空间法含控制环节的多端混合高压直流系统的快速建模、主要影响参数筛选、参数的可行域计算与可视化展示以及基于粒子群算法的多端混合高压直流系统控制参数优化。介绍了该方法的主要步骤、实现原理以及算例应用情况。应用结果表明所提方法是对多端混合高压直流输电系统控制参数分析与优化的有效工具,可为多端混合高压直流输电系统参数设计提供参考。

Multi-terminal hybrid HVDC technology combines the advantages of line commutation converter and modular multi-level converter, and is one of the research hotspots of HVDC nowadays. Based on the small signal stability analysis method, the control parameters of multi-terminal hybrid HVDC system can be analyzed mathematically. However, since the multi-terminal HVDC system includes multiple MMC stations with complex controllers involving many control parameters. There is not convenient tools to employ, and the impact of control parameters on the system is still unclear. In this paper, based on the small signal stability analysis method, a control parameter analysis and optimization methods for multi-terminal hybrid HVDC system is proposed. This method can realize fast modeling for multi-terminal hybrid HVDC system with control links based on state space method, screening of main influencing parameters, the calculation and visualization of the feasible region and the optimization of control parameters for multi-terminal hybrid HVDC system based on particle swarm optimization algorithm. In this paper, the main steps, implementation principle and application of the method are introduced. The application results show that the proposed method is a practical tool for the analysis and optimization of control parameters for multi-terminal hybrid HVDC system, and it is helpful for the parameter design of multi-terminal hybrid HVDC system.