MMC控制器小信号稳定性判据研究OACSTPCD
Research on a small-signal stability criterion for MMC controller
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.
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.
伍双喜;刘洋;朱誉;王姗;郑乐
广东电网有限责任公司电力调度控制中心,广州 510030新能源电力系统全国重点实验室(华北电力大学),北京 102206
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
MMCclosed-loop controllercontroller inertiacontroller gainsmall-signal stability
《浙江电力》 2024 (008)
36-46 / 11
南方电网公司科技项目(GDKJXM20220335);国家自然科学基金(52307095)
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