大型调相机升压涌流分析及升压策略优化  

Analysis of Boost Inrush Current and Optimization of Boost Strategy for Large Capacity Synchronous Condenser

作　　者：牟伟[1] 任百群 施一峰[1] 韩兵[1] 钟高跃 吴龙[1] MU Wei;REN Baiqun;SHI Yifeng;HAN Bing;ZHONG Gaoyue;WU Long(NR Electric Co.,Ltd.,Nanjing 210006,China)

机构地区：[1]南京南瑞继保电气有限公司,南京211106

出　　处：《大电机技术》2025年第1期48-56,共9页Large Electric Machine and Hydraulic Turbine

摘　　要：快速大容量调相机已成功应用于直流输电换流站,实现系统故障期间提供快速动态无功支撑。但在实际运行中,已发生多起调相机在启动升压过程中因涌流问题导致的同期并网失败或启机保护跳闸,错过了调相机并网关键时机,对直流系统运行以及电网安全稳定造成不利影响。本文介绍了新一代大型调相机的启动过程和升压涌流现象,通过理论推导和PSCAD/EMTDC仿真,详细分析了调相机启动升压过程中影响涌流大小的各种因素。本文针对其中主要因素对现有启动升压方法进行优化,提出两段式的分段变速升压策略。仿真结果表明优化后的升压控制策略不但能有效减小升压过程中的励磁涌流,还能保证较短升压时间,有效避免升压失败和启机过流保护跳闸、提高调相机的启机成功率。Large capacity and fast response synchronous condensers have been continuously applied in UHVDC converter stations in order to provide fast dynamic reactive power support under severe system faults.In actual operation,there have been multiple instances of grid connection failures or startup protection trips caused by inrush currents during the start-up and boost process of the condenser,which have delayed the grid connection opportunity of the condenser and caused adverse effects on the operation of the UHVDC system and the safety&stability of the power grid.This article introduces the start-up process of the synchronous condenser and inrush current phenomenon,analyzes the different factors that affect the magnitude of inrush current during the start-up process through theoretical deduction and PSCAD/EMTDC simulation,optimizes the existing start-up method,and proposes a two-stage segmented variable speed boost strategy.Simulation results shows that the optimized boost strategy significantly reduces inrush current during the boost process while ensuring a shorter boost time,effectively avoiding boost failure and tripping of the startup over current protection,and improving the success rate of the condenser′s startup and grid connection.

关 键 词：调相机 励磁 涌流 惰速并网 升压策略 分段变速 

分 类 号：TM342[电气工程—电机]