摘要
针对模块化多电平换流器型多端直流(MMC-MTDC)输电系统的稳定性受不同换流站控制系统之间相互作用的影响,不恰当的控制参数可能会降低MMC-MTDC系统的稳定裕度问题,提出一种MMC-MTDC控制参数的优化方法以提升系统的稳定裕度。首先,建立包括MMC主回路、控制系统、交流系统与直流系统的MMC-MTDC小信号模型。其次,建立以特征值为目标函数的控制参数优化问题,并提出一种基于参数灵敏度的控制参数优化算法。在优化过程中,采用回溯直线搜索(BLS)计算每次迭代的搜索步长。最后,在一个三端MMC-MTDC系统中应用所提出的控制参数优化方法进行稳定性分析与时域仿真,并与粒子群算法进行比较。结果表明所提出的MMC-MTDC控制参数优化方法能够有效提升系统的稳定裕度,且在优化结果与优化效率具有一定的优越性。
Aiming at the problem that the stability of modular multilevel converter based multi terminal high voltage direct current transmission system(MMC-MTDC)is affected by the interaction between the control systems of different converters,and inappropriate control parameters may reduce the stability margin of MMC-MTDC system,an optimization method of MMC-MTDC control parameters is proposed to improve the stability of the system.First,the small signal dynamic model of MMC-MTDC including MMC main circuit,control system,AC system and DC system was established.Second,the optimal design of control parameters with eigenvalue-based objective function was formulated,and a joint optimization algorithm based on parameter sensitivity analysis was proposed.In the process of optimization,backtracking line search(BLS)was applied to calculate the feasible optimization step of each iteration.Finally,the proposed control parameter optimization design method was applied in a three-terminal MMC-MTDC system.Stability assessment,time domain simulation and the comparison with the particle swarm optimization were performed to verify the effectiveness of the proposed parameter optimization design method.
作者
刘宛菘
秦博宇
张若微
刘佳玲
LIU Wan-song;QIN Bo-yu;ZHANG Ruo-wei;LIU Jia-ling(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;Smart Grid Key Laboratory of Shaanxi Province,Xi’an Jiaotong University,Xi’an 710049,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2021年第2期10-18,27,共10页
Electric Machines and Control
基金
国家重点研发计划资助项目(2018YFB0904600)。
关键词
模块化多电平换流器
多端直流输电系统
稳定性分析
小信号模型
灵敏度分析
控制参数优化
modular multilevel converter
multi-terminal direct current
stability analysis
small signal dynamic model
sensitivity analysis
control parameters optimal design
