摘要
高压直流输电中交流侧二次谐波分量和直流侧基频分量通过换流器相互调制形成混合谐振,从而使换流变压器铁芯饱和并最终导致混合谐振型谐波不稳定。研究了混合谐振型不稳定产生的机理,并采用仿真方法求取换流器两侧谐波关系的矩阵参数,然后推导了混合谐振型不稳定判据。最后采用PSCAD/EMTDC自建电磁暂态仿真模型,对自发式混合谐振型不稳定进行了仿真研究,验证了混合谐振型不稳定判据的有效性。
The composite resonance is formed by the intermodulation between the secondary harmonic component on the AC side and the fundamental frequency component on the DC side via the converters. It can lead to converter transformer core saturation and result in composite resonant harmonic instability. The generation mechanism of composite resonant harmonic instability is researched, simulation method is used to obtain the matrix, and composite resonant instability criterion is derived. The electromagnetic transient simulation model is built by use of software package PSCAD/EMTDC, and the spontaneous harmonic instability caused by composite resonance is researched. Simulation results verify the effectiveness of composite resonant instability criterion. This work is supported by National Natural Science Foundation of China （No. 51037003）.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第14期81-85,共5页
Power System Protection and Control
基金
国家自然科学基金重点项目(51037003)~~
关键词
混合谐振
谐波不稳定
高压直流输电
电磁暂态仿真
composite resonance
harmonic instability
HVDC transmission
electromagnetic transient simulation
