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混合级联多端直流暂态过电压机理及抑制措施

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混合级联多端直流采用常规直流与柔性直流混合级联的新型拓扑结构，为我国远距离、大容量、多落点的能源传输提供了新模式，但常规直流与柔性直流之间的交互作用也引发了新问题。该文首先揭示实际受端电网交流电压恢复特性导致混合级联多端直流暂态过电压机理以及低端模块化多电平换流器(modular multilevel converter，MMC)闭锁风险;然后分别从送受端两个方面，提出降功率运行、改进送端移相策略和提升 MMC 有功功率传输极限等暂态过电压抑制措施。最后，基于PSD-PSModel软件，搭建送受端电网机电暂态和混合级联多端直流电磁暂态的混合仿真模型，仿真验证理论分析的准确性和抑制措施的有效性。
Transient Overvoltage Mechanism and Suppression Measures of Hybrid Cascade Multi Terminal HVDC
Hybrid cascade multiterminal HVDC adopts a new structure of line commutated converter(LCC)and modular multilevel converter(MMC)hybrid cascade,which provides a new mode for energy transmission of long distance,large capacity and multiple access points in China,but the interaction between LCC and MMC also brings new problems.This paper reveals the mechanism of the transient overvoltage of hybrid cascade multi terminal HVDC caused by AC voltage recovery characteristics in the receiver scenario,evaluates the risk of MMC blocking caused by transient overvoltage,and then proposes transient overvoltage suppression measures such as power reduction operation,improving the phase shifting strategy of the transmitter and increasing the transmission limit of active power of MMC from two aspects of the sending and receiving end.Finally,based on the electromechanical electromagnetic hybrid simulation software PSD-PSModel,the electromechanical transient model of the AC power grids and the electromagnetic transient model of the hybrid cascade multi terminal HVDC are built in this paper.The accuracy of the theoretical analysis and the effectiveness of the suppression measures are verified by simulation.

hybrid cascade multi terminal HVDCtransient overvoltagephase shifting strategyactive power transmission limit of modular multilevel converter(MMC)PSModel

连攀杰、刘文焯、孙华东、郑超、许克、任永浩、汤涌

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电网安全与节能国家重点实验室(中国电力科学研究院有限公司),北京市 海淀区 100192

混合级联多端直流 暂态过电压 移相策略 模块化多电平换流器有功功率极限 PSModel

中国电力科学研究院有限公司自筹基金项目

XT83-21-017

2024

10.13334/j.0258-8013.pcsee.230093

中国电机工程学报
中国电机工程学会

中国电机工程学报

CSTPCD北大核心
影响因子：2.712
ISSN：0258-8013
年,卷(期)：2024.44(13)