MMC控制器小信号稳定性判据研究
Research on a small-signal stability criterion for MMC controller
伍双喜 1刘洋 1朱誉 1王姗 2郑乐2
作者信息
- 1. 广东电网有限责任公司电力调度控制中心,广州 510030
- 2. 新能源电力系统全国重点实验室(华北电力大学),北京 102206
- 折叠
摘要
基于MMC(模块化多电平换流器)的高压直流输电广泛应用于大规模新能源外送,然而MMC控制器的惯性滞后特性可能带来小信号稳定性问题.首先,分析同步发电机的机械惯性,类比提出适用于MMC控制器的惯性二阶统一表达式.然后,基于MMC闭环控制器的动态特性和惯性滞后特性,提出连接弱电网的MMC控制器的小信号稳定性判据.最后,通过对双侧MMC并网系统的仿真分析,验证了所提稳定性判据的正确性.
Abstract
High voltage direct current(HVDC)transmission based on modular multilevel converter(MMC)is widely used in large-scale renewable energy delivery.However,the lagged inertia of MMC controllers may under-mine the small-signal stability.Firstly,the mechanical inertia of synchronous generators is analyzed,and a second-order unified expression of inertia applicable to MMC controller is proposed.Secondly,based on the dynamic and in-ertial delay of MMC closed-loop controller,a small-signal stability criterion for MMC controller connected to weak power grid is presented.Finally,through simulation analysis of a double-side MMC grid-connected system,the cor-rectness of the proposed stability criterion is validated.
关键词
模块化多电平换流器/闭环控制器/控制器惯性/控制器增益/小信号稳定性Key words
MMC/closed-loop controller/controller inertia/controller gain/small-signal stability引用本文复制引用
基金项目
南方电网公司科技项目(GDKJXM20220335)
国家自然科学基金(52307095)
出版年
2024
国家科技期刊平台
NSTL
万方数据