具备无功支撑能力的双馈变流器故障穿越技术研究

Fault Ride through Research Converter of Double-Fed with Reactive Power Support

随着风力发电在电网中所占比例的日益增长,电网故障穿越能力凸显重要。本文对双馈变流器故障穿越硬件实现进行了描述,介绍了一种改进的可靠的交流Crowbar电路设计方案。结合公司现2MW双馈变流器,设计了电网故障时双馈风电机组网侧和机侧变流器有功、无功功率的分配方案。仿真研究与样机测试均表明,该技术方案在确保电网故障不脱网工况下,能够提供一定的动态无功支撑协助电网电压快速恢复。

With the growing proportion of wind power, the grid fault ride-through capability becomes very important. In this paper, the hardware implementation of the double fed converter is described, and an improved Crowbar circuit design scheme is presented. Combined with 2MW doubly-fed converter, an active and reactive power allocation scheme for the doubly-fed wind turbine grid side and motor side converter when the grid failure is designed. Simulation research and prototype testing show that the control scheme ensures that grid failure does not cut off grid conditions, is able to provide some dynamic reactive power grid voltage supoort to assist rapid recovery.