摘要
电网换相换流器型高压直流输电(line commutated converter high voltage direct current,LCC-HVDC)的强非线性导致其内部频率耦合复杂多样,传统建模方法难以兼顾准确性与实用性。为此,提出了一种基于相移原理的降维谐波状态空间(harmonic state space,HSS)建模方法,将谐波域相移原理与HSS理论相结合,建立了LCC-HVDC系统的降维HSS模型。通过PSCAD/EMTDC平台搭建LCC-HVDC系统的时域仿真算例,验证了所建模型的正确性。在此基础上分析了LCC-HVDC系统的小扰动稳定性,并采用参与因子对失稳模态的主导因素进行了辨识。基于所建立的模型进一步研究了HSS截断阶数对模型精度及稳定性分析的影响,并给出了LCC-HVDC系统HSS模型截断阶数选取的建议。结果表明,所提模型具有较高的完整性与准确性,且相较于传统HSS模型的维度降低了一半,大大缩短了计算时间,有效降低了理论分析的复杂度。
The strong nonlinearity of line commutated converter high voltage direct current(LCC-HVDC)leads to complexity and diversity of its internal frequency coupling,and the traditional modeling method finds it difficult to give consideration to accuracy and practicality.Therefore,a reduced dimension harmonic state space(HSS)modeling method based on the phase shift principle is proposed.The reduced dimension HSS model of an LCC-HVDC system is established by combining the harmonic domain phase shift principle with HSS theory.The time-domain simulation model of the LCC-HVDC system is also built in PSCAD/EMTDC to verify the correctness of the model.The small disturbance stability of an LCC-HVDC system is analyzed,and the dominant factors of the instability mode are identified by participation factor.Then,based on the established model,the influence of HSS truncation order on model accuracy and stability analysis is studied,and suggestions on the selection of HSS model truncation order of an LCC-HVDC system are given.The results show that the proposed model has higher integrity and accuracy,and the dimension is reduced by half compared with the traditional HSS model.This greatly shortens the calculation time and effectively reduces the complexity of theoretical analysis.
作者
王杨
田旭
赵劲帅
肖先勇
夏菲
王海风
WANG Yang;TIAN Xu;ZHAO Jinshuai;XIAO Xianyong;XIA Fei;WANG Haifeng(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2023年第14期11-22,共12页
Power System Protection and Control
基金
国家自然科学基金项目资助(52177104)
四川省自然科学基金项目资助(2022NSFSC1911)。
关键词
LCC-HVDC
谐波状态空间
相移原理
降维建模
小扰动稳定性
截断阶数
LCC-HVDC
harmonic state space
phase shift principle
dimension reduction modeling
small disturbance stability
truncation order
