Day-ahead dispatch strategy for integrated system of wind/photovoltaic/pumped-storage/gas-turbine-power/energy storage based on multi-frequency scale of PWP

A day-ahead dispatch strategy for the integrated system of wind/photovoltaic/pumped-storage/gas-turbine-power/energy storage is proposed based on the multi-frequency scale power of wind/photovoltaic (PWP). First, filter analysis of the PWP is carried out according to the control target of the system to get the components of PWP under different frequency scales; thus, the power output of different compensatory plants can be scheduled. Second, an improved particle swarm optimization algorithm is utilized to parallel optimize costs of different plants and calculate the overall power output of the integrated system. Finally, based on different dispatch modes, considering system stability and the penetration ability of wind/photovoltaic, the per-unit generation cost of the integrated system is optimized and the power output is scheduled. Simulation results show that, compared with traditional optimization models and algorithms, the proposed strategy is capable of smoothing the power fluctuation caused by large-scale wind/photovoltaic integration, as well as realizing economical, efficient and environmentally friendly operation of the system. Copyright (c) 2014 John Wiley & Sons, Ltd.