Research on Calculation of Curtailed Wind Power of Series Wind Farms and Methods of Reducing Wind Curtailment

With the growing demand for building low-carbon and green new power systems, the proportion of renewable energy, particularly wind power, is constantly increasing. The use of a DC scheme in large-scale wind power collection offers advantages in terms of stability and efficiency. Compared with the parallel collection solution, the series collection solution does not require high transformation ratio DC transformers, providing benefits such as enhanced stability and reduced costs. However, due to the series structure, the power difference of wind turbines at all levels will cause wind curtailment, bringing economic losses. This paper focuses on DC series wind farms, analyzing the wind curtailment mechanism of the series wind farms. Additionally, through theoretical derivation, the paper analyzes and obtains the factors that affect the curtailed wind power of the series wind farms. To reduce the curtailed wind power, a wind turbine output voltage regulation BUCK circuit is designed, with the relationship between the BUCK circuit duty cycle and curtailed wind power calculated. Finally, the accuracy of theoretical analysis and the effectiveness of the proposed scheme have been verified through simulation. In the case study, by using the BUCK converter, the range of power difference that avoids wind curtailment is increased by 150%, significantly reducing the occurrence of wind curtailment.