Study on Transient Voltage Characteristics of DC System by Different Pooling Methods of Wind Turbines

With the adjustment of China's energy structure and the rapid development of clean energy, wind power has become an important part of China's energy sector. UHVDC is an important way to transmit new energy to the load center in the middle east. However, the power grid at the transmission end of HVDC is relatively weak, and the voltage of the power grid at the transmission end changes greatly due to the wide range of reactive power fluctuations in the transient process. The local reactive power compensation makes the different aggregation modes of wind turbines have an important influence on the transient voltage characteristics of the HVDC transmission system. In this paper, the influence mechanism of different converging modes of wind turbines on transient voltage characteristics of HVDC system is studied, and the modeling simulation is carried out. The transient voltage response of the feed-end system is studied from two different converging modes of doubly-fed wind turbines, which can provide guidance for wind power generation control design and layout, and provide theoretical basis for optimizing the converging mode of wind turbines.