Joint Operation of Wind Farms and Pump-storage Plants in Ancillary Services and Power Markets

In this paper, a new bidding strategy in generation scheduling and commitment is proposed for uncoordinated and joint scheduling of wind farms and pump-storage power plants in the day-ahead electricity markets and ancillary services. Also, the value at risk (VaR) of joint and uncoordinated operations (JO and UO) for these two plants is calculated and evaluated. Uncertainties of wind power generation (WPG) and the market prices convert this scheduling problem to a stochastic scheduling problem. On the other hand, the pump-storage plants have the ability to manage of positive and negative energy imbalances over time. Therefore, with joint scheduling of pump-storage plants with wind units, the benefit of these plants is increased compared with UO of these plants. Uncertainty of market price and amount of WPG are modeled using scenario tree. The proposed method is tested on pump-storage and wind farm of IEEE 118-bus standard system. Also, by evaluating the scheduling operation risk, the VaR level has determined. The results of the benefit and risk for JO and UO of pump storage and wind farm verifies that these joint operations improve the benefit and risk values of the system.