伍双喜,刘洋,朱誉,王姗,郑乐
WU Shuangxi,LIU Yang,ZHU Yu,WANG Shan,ZHENG Le

• 1:广东电网有限责任公司电力调度控制中心
• 2:新能源电力系统全国重点实验室(华北电力大学)

摘要(Abstract)：

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 undermine the small-signal stability. Firstly, the mechanical inertia of synchronous generators is analyzed, and a secondorder unified expression of inertia applicable to MMC controller is proposed. Secondly, based on the dynamic and inertial 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 correctness of the proposed stability criterion is validated.

关键词(KeyWords)： 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
MMC;closed-loop controller;controller inertia;controller gain;small-signal stability

Abstract:

Keywords:

基金项目(Foundation): 南方电网公司科技项目（GDKJXM20220335）;; 国家自然科学基金（52307095）

作者(Author): 伍双喜,刘洋,朱誉,王姗,郑乐
WU Shuangxi,LIU Yang,ZHU Yu,WANG Shan,ZHENG Le

DOI: 10.19585/j.zjdl.202408005

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