摘要
模块化多电平换流器高压直流输电(modular multilevel converter based high voltage direct current,MMC-HVDC)在弱交流电网下潜在的振荡问题给电力系统的安全稳定运行带来挑战。弱电网下的振荡问题主要与控制环节之间的交互作用有关,该文从锁相环和内环控制出发,首先研究不同短路比下锁相环及内环电流控制带宽对MMC系统稳定裕度的影响,发现系统相位裕度随内环控制带宽变化的“非单调”变化特性及该特性对内环带宽设计带来的挑战。然后基于主导模态参与因子分析,指出该“非单调”特性的产生与锁相环、内环控制、外环控制三者之间交互作用的增强有关,并提出不同短路比下提升系统稳定裕度的内环控制带宽设计方法。最后,通过仿真验证上述“非单调”变化特性及内环控制带宽设计方法的正确性。
The potential oscillation in MMC-HVDC system under weak AC grid condition brings challenge to the safety and stability of the power system.It is well known that the oscillation of MMC-HVDC is related to the controller interaction.This paper analyzed the impact of phase-locked loop(PLL)and inner loop control bandwidth on the stability margin of MMC system under different short circuit ratio(SCR).The results showed that there existed the“non-monotonic”variation trend of the phase margin with the change of inner loop control bandwidth,which presented the challenge for the selection of inner loop control parameters.Moreover,the participation factor analysis for the dominant mode showed that the“non-monotonic”characteristic was related to the interaction among PLL,inner loop control and outer loop control.Then,this paper proposed a parameter design method for inner loop control to improve system stability under different SCR conditions.Finally,the“non-monotonic”characteristic and the parameter design method were verified by simulation.
作者
王燕宁
郭春义
杨硕
庞博
林欣
WANG Yanning;GUO Chunyi;YANG Shuo;PANG Bo;LIN Xin(State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第10期3538-3547,共10页
Proceedings of the CSEE
基金
华能集团总部科技项目:海上风电与智慧能源系统科技专项(一期)(HNKJ20-H88)。
关键词
模块化多电平换流器
弱交流电网
内环控制
锁相环
稳定裕度
非单调
modular multilevel converter(MMC)
weak AC grid
inner loop control
phase-locked loop(PLL)
stability margin
non-monotonic
