Research on a small-signal stability criterion for MMC controller

WU Shuangxi; LIU Yang; ZHU Yu; WANG Shan; ZHENG Le

doi:10.19585/j.zjdl.202408005

Zhejiang dianli (Aug 2024)

Research on a small-signal stability criterion for MMC controller

WU Shuangxi,
LIU Yang,
ZHU Yu,
WANG Shan,
ZHENG Le

Affiliations

WU Shuangxi: Eletric Power Dispatching and Control Center of Guangdong Power Grid Co.， Ltd， Guangzhou 510030， China
LIU Yang: Eletric Power Dispatching and Control Center of Guangdong Power Grid Co.， Ltd， Guangzhou 510030， China
ZHU Yu: Eletric Power Dispatching and Control Center of Guangdong Power Grid Co.， Ltd， Guangzhou 510030， China
WANG Shan: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources （NCEPU）， Beijing 102206， China
ZHENG Le: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources （NCEPU）， Beijing 102206， China

DOI: https://doi.org/10.19585/j.zjdl.202408005
Journal volume & issue: Vol. 43, no. 8
pp. 36 – 46

Abstract

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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 second-order 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.

Published in Zhejiang dianli

ISSN: 1007-1881 (Print)
Publisher: zhejiang electric power
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: http://zjdl.cbpt.cnki.net/

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