Study on stability evaluation in multi-send hybrid AC/DC transmission system

2019 The 5th International Conference on Electrical Engineering, Control and Robotics

无线电电子学;计算机科学

Li, Rong^1

Kunming Power Supply Bureau of Yunnan Power Grid Co. Ltd, Kunming City, Yunnan

650011, China^1

关键词: AC/DC hybrid transmission system;    Control characteristics;    High voltage direct current;    Multi infeed system;    Short circuit ratio;    Stability evaluation;    Stability performance;    Transmission systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/533/1/012003/pdf
DOI  :  10.1088/1757-899X/533/1/012003

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Our country has shown the significant features of high voltage direct current (HVDC) including multi-infeed and multi-send. Compared to multi-infeed system, there are a lot of weakness in the multi-send system, such as the grid structure is single and weak, which makes the interaction between AC and DC to a greater extent affect the stability of the multi-send hybrid AC/DC transmission system. In order to evaluating the system strength in multi-send hybrid AC/DC transmission system, for the first time, this paper proposed the general formula and simplified formula for multi-send short-circuit ratio (MSSCR), which accounts for the coupling between multi-dc projects. Considering the control characteristics of rectifier in sending-side and combining the maximum power curve method, the criticality of MSSCR is proposed. Multi-send critical short-circuit ratio (MSCSCR) is deduced by the quasi steady-state equation of rectifier, to determine the multi-send system is strength enough or not. The proposal of MSSCR is of considerable significance for effectively evaluating the stability performance of the multi-send AC/DC hybrid transmission system, completing the short-circuit ratio theoretical system, and consolidating the short-circuit ratio index status.