Reliability Assessment of HVDC Receiving-end System Considering Wind Power Output Uncertainty

The ever-increasing proportion of HVDC and wind power has a great impact on the reliability of the receiving-end power system. It is essential to consider the HVDC transmission system power flow when assessing the reliability of the receiving-end power system integrated with wind power. Considering the symmetry characteristic of HVDC system, a novel HVDC system reliability model, which uses the number of available converter units for equivalent failure, is used to assess the reliability to reduce the complexity of the calculation. The uncertainty of wind power will be modelled based on the wind speed which follows to Weibull distribution. Then, the AC-DC coupling equation considering converter units and the optimal power flow model of AC-DC coupling system are introduced. Moreover, based on the optimal power flow model of AC-DC coupling system, the EENS is calculated by Monte-Carlo method. Furthermore, the reliability of receiving-end power system and nodal reliability is assessed with five different scenarios in a modified IEEE-RTS-24 system.