并网变流器阻抗建模与仿真研究
Modeling and Simulation of Impedance of Grid-Connected Converter
摘要: 分布式新能源经过并网变流器接入弱电网时，使得电网系统趋于复杂，引发了许多新型次/超同步振荡问题。该问题是由变流器侧的阻抗和网侧阻抗的交互作用所造成的，因此，通过变流器阻抗建模来分析该交互系统能否稳定运行。所以本文旨在建立并网变流器的阻抗模型，并通过仿真验证阻抗建模的正确性。并考虑延时环节对并网变流器阻抗模型的影响。最终本论文实现了并网变流器阻抗建模与仿真模型得出的变流器阻抗模型对应一致，论证了研究内容的正确性。
Abstract:
When the distributed new energy is connected to the weak power grid through the grid-connected converter, the power grid system tends to be complicated, which leads to many new sub-synchronous/super-synchronous oscillation problems. This problem is caused by the interaction between the impedance on the converter side and the impedance on the grid side. Therefore, the converter impedance modeling is used to analyze whether the interactive system can operate stably. Therefore, this paper aims to establish the impedance model of the grid-connected converter and verify the correctness of the impedance modeling through simulation. The influence of delay on the impedance model of grid-connected converter is considered. Finally, this paper realizes the matching of the impedance model of the grid-connected converter and the impedance model of the simulation model, which proves the correctness of the research content.
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