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Mitigating intraday wind generation uncertainty with HVDC systems

Large-scale integration of wind power generation is leading to increasing uncertainties in short-term power system operation. Thus, there is a need to include these uncertainties in reliability management to ensure secure grid operation. At the same time, the increasing application of embedded HVDC systems in the existing grid provides additional flexibility in maintaining reliable hybrid AC/DC grid operation. HVDC systems could help deal with the wind generation forecast uncertainties due to their power flow control capabilities. In this paper, an existing preventive-curative security constrained optimal power flow is extended to a stochastic framework where the role of HVDC set point changes in mitigating intraday wind generation forecast errors is evaluated. The analysis shows that applying curative actions from HVDC leads to lower costs for secure operation. Curative control of HVDC is particularly beneficial for handling negative wind generation forecast errors and constrained grid situations. It is also seen that using curative HVDC control leads to significantly lower costs while mitigating uncorrelated wind forecast errors in the system.