CAJ | 학술논문

小信号稳定性分析是柔性直流输电系统设计、工程建设及运行的前提，针对无源网络供电的双端柔性直流输电系统小信号稳定性展开研究。首先通过同步旋转坐标系的灵活选择与转换，推导系统各环节的线性化方程，建立不受交流系统短路容量限制的全局小信号模型，并通过电磁暂态仿真与小信号模型仿真对比，验证其正确性。基于该模型，采用模态分析法对系统稳定性进行分析，并提出灵敏度分析方法，用于识别系统不稳定性的症结。通过案例分析及仿真，证明该分析方法具备良好的准确性。
소신호은정성분석시유성직류수전계통설계、공정건설급운행적전제，침대무원망락공전적쌍단유성직류수전계통소신호은정성전개연구。수선통과동보선전좌표계적령활선택여전환，추도계통각배절적선성화방정，건립불수교류계통단로용량한제적전국소신호모형，병통과전자잠태방진여소신호모형방진대비，험증기정학성。기우해모형，채용모태분석법대계통은정성진행분석，병제출령민도분석방법，용우식별계통불은정성적증결。통과안례분석급방진，증명해분석방법구비량호적준학성。
Small signal stability analysis of VSC-HVSC applied to passive network, which is the prerequisite for design and construction, is discussed in this paper. By choosingd-q synchronous reference frame flexibly, the Linear equations of each part are modeled. And based on the state space method, the small signal model of whole system is established. Then the model was validated by comparing Electromagnetic transient simulation and the small-signal model simulation. Modal analysis is performed to identify the small signal stability of VSC-HVDC. And sensitivity analysis is used to find out the crux of instability. Finally, the case study and simulation show that the analytical method has good accuracy.