Frequency-Reactive Power Optimization Strategy of Grid-forming Offshore Wind Farm Using DRU-HVDC Transmission
2023 IEEE 7th Conference on Energy Internet and Energy System Integration (EI2)(2024)
摘要
The diode rectifier unit-based high voltage direct current (DRU-HVDC)
transmission with grid-forming (GFM) wind turbine is becoming a promising
scheme for offshore wind farm(OWF) integration due to its high reliability and
low cost. In this scheme, the AC network of the OWF and the DRU has completely
different synchronization mechanisms and power flow characteristics from the
traditional power system. To optimize the power flow and reduce the net loss,
this paper carries out the power flow modeling and optimization analysis for
the DRU-HVDC transmission system with grid-forming OWFs. The influence of the
DRU and the GFM wind turbines on the power flow of the system is analyzed. On
this basis, improved constraint conditions are proposed and an optimal power
flow (OPF) method is established. This method can minimize the power loss by
adjusting the reactive power output of each wind turbine and internal network
frequency. Finally, based on MATLAB, this paper uses YALMIP toolkit and CPLEX
mathematical solver to realize the programming solution of the OPF model
proposed in this paper. The results show that the proposed optimization
strategy can effectively reduce the power loss of the entire OWF and the
transmission system with an optimization ratio of network losses exceeding
25.3
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关键词
offshore wind farm integration,reactive power optimization,frequency optimization,grid-forming wind turbine,DRU-HVDC
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