电力系统自动化2024，Vol.48Issue(16)：40-50,11.DOI:10.7500/AEPS20230615004
MMC-HVDC交直流混联系统小扰动稳定域迭代求解和形态分析
Iterative Solving and Morphological Analysis of Small-signal Stability Region for Hybrid AC/DC System with MMC-HVDC
摘要
Abstract
With the development of HVDC transmission technology,regional power systems will expand into large-scale hybrid AC/DC systems.Therefore,it is necessary to build a large-scale hybrid AC/DC system model that is able to accurately depict both AC and DC dynamics to study the dynamics and stability of the hybrid system.Considering the detailed dynamics from both AC and DC sides,this paper establishes a state-space model of the asynchronously interconnected hybrid AC/DC system with modular multilevel converter based high voltage direct current(MMC-HVDC).The specific analytic solution form is given and a multi-layer iterative trust-region algorithm(MITRA)is derived.The proposed algorithm builds the mapping relation between the points in the decision variable space and the equilibrium points.Combining with the boundary identification based on the Hopf bifurcation,this paper proposes a multi-iteration method for solving the small-signal stability region boundary.After verifying the model accuracy by using the Simulink simulation,the stability region of the hybrid AC/DC system is plotted with the generator output as the decision variable.By using the eigenvalues and participation factors,the mechanisms of DC instability and AC instability as well as the influences of control strategies and parameters on the region boundary are all quantitatively studied.The stability regions of the multi-region hybrid system and the AC system are compared and analyzed.The results show that the introduction of the converter station and the DC network may cause the stability region boundary of the multi-region system to present an approximate piecewise linear topology characteristic determined by multiple constraints.关键词
交直流混联系统/模块化多电平换流器/信赖域算法/稳定域/参与因子/Hopf分岔Key words
hybrid AC/DC system/modular multilevel converter(MMC)/trust-region algorithm/stability region/participation factor/Hopf bifurcation引用本文复制引用
曹靖洺,董朝宇,王睿,穆云飞,肖迁,贾宏杰..MMC-HVDC交直流混联系统小扰动稳定域迭代求解和形态分析[J].电力系统自动化,2024,48(16):40-50,11.基金项目
国家自然科学基金资助项目(52061635103). This work is supported by National Natural Science Foundation of China(No.52061635103). （52061635103）
