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Abstract
VSC-HVDC has received extensive attention because of its advantages in power grid expansion, AC systems interconnection and large-scale wind farm integration. However, faults such as the lockout of converter valve will lead to power surplus and voltage instability, which will cause great security threats. Therefore, how to eliminate surplus power and stabilize voltage is a research focus in this field. In this paper, the electrical parameters of Zhangbei Substation are adjusted in a reasonable proportion, a practical model of wind farms and connected power grid are constructed. The model cleverly reflects the operating status and technical characteristics of Zhangbei Substation. Based on that, the effect of energy absorbing device switching operation (timing coordinate with wind turbines and switches) on the islanding system when the converter valve is locked is researched by using electromagnetic transient simulation, which demonstrates its significant effect on absorbing the surplus power and maintaining the stability of voltage. Possible failures of the energy absorbing device itself during the switching process have also been studied. Furthermore, the trend of system power and voltage varies with the fault security is researched. The conclusion provides theoretical support for the fault analysis and troubleshooting strategies of the energy absorbing device in VSC-HVDC project.
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