首页|分网接入方式下LCC-HVDC系统运动方程模型及交互振荡模式的阻尼特征(二):交互振荡模式研究

分网接入方式下LCC-HVDC系统运动方程模型及交互振荡模式的阻尼特征(二):交互振荡模式研究

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
为研究分网接入方式下电网换相换流器高压直流输电(line commutated converter based high voltage direct current，LCC-HVDC)系统的交互振荡模式及阻尼特征，基于系统的状态空间模型及系列文章(一)建立的运动方程模型，提取了表征逆变侧电气与控制环节强耦合特性的多个弱阻尼交互振荡模式，研究了不同短路比工况下交互振荡模式的变化特征。在此基础上，通过复转矩系数法量化评估了整流侧/逆变侧内部自稳性路径及双极交互作用致稳性路径对主导交互振荡模式阻尼特性的贡献度。结果表明:1)不同短路比工况下交互振荡模式的阻尼比会进行重新分配;2)当逆变侧正负极短路比相差较大时，双极交互作用较弱，正负极系统的稳定性由2个交互振荡模式各自主导，且稳定性特征有所差异;3)当逆变侧正负极短路比相近时，双极间动态交互加强，交互振荡模式会同时主导参与系统两极的稳定性，正负极稳定性特征相似。
Motion Equation Model and Damping Characteristic of Interactive Oscillation Modes for LCC-HVDC System in Split-connection Mode(Part Ⅱ):Research on Interactive Oscillation Modes
To investigate the interactive oscillation modes of line commutated converter based high voltage direct current(LCC-HVDC)system in split-connection mode and their damping characteristics,based on the system state space model and the motion equation model established in Part I,several weak-damping interactive oscillation modes featured by the strong coupling effects between electrical and control links at the inverter side are extracted.Also,the variation features of interactive oscillation modes under different short circuit ratio(SCR)conditions are studied.On this basis,the damping contribution from the self-stabilizing path of the rectifier/inverter-side and the en-stabilizing path of bipolar interaction to the dominant interactive oscillation modes are quantitatively evaluated by the complex torque coefficient method.The results show that,1)the damping ratios of the interactive oscillation modes will be redistributed under different SCR conditions.2)When the positive-pole SCR and negative-pole SCR at the inverter side are different significantly,the bipolar interaction is weak.The stability of the positive-pole and negative-pole system is dominated by the two interactive oscillation modes separately,and the stability characteristics are different.3)When the positive-pole SCR is close to negative-pole SCR at the inverter side,the dynamic interaction between the two poles is strengthened,in which case,interactive oscillation modes will dominate stability of the positive-pole system and negative-pole system simultaneously,presenting similar stability characteristics.

line commutated converter based high voltage direct current(LCC-HVDC)split-connection modeinteractive oscillation modedamping characteristicbipolar interaction

张加卿、郭春义、杨硕

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新能源电力系统国家重点实验室(华北电力大学),北京市 昌平区 102206

电网换相换流器高压直流输电(LCC-HVDC) 分网接入 交互振荡模式 阻尼特征 双极交互作用

国家自然科学基金项目

52277093

2024

10.13334/j.0258-8013.pcsee.222069

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(5)
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