Short-term hydro-thermal-wind-photovoltaic complementary operation of interconnected power systems

With the booming expansion of new energy such as wind and solar energy, the increasing curtailment of new energy power has severely hindered its further development. In this paper, a complementary coordinated operation model of interconnected power systems with hydro-thermal-wind-photovoltaic (HTWP) plants is proposed to mitigate the curtailment problem of new energy by maximizing the new energy power generation and minimizing the thermal output fluctuation. Specifically, multi-energy complementary operation and multi-area coordinated operation are coupled to take advantage of the peak regulation capacity of hydropower plants and the power transfer capability between different regions. The maximum consumption space of new energy power is proposed to reduce the decision space and increase solving efficiency. The adaptive simultaneous peak regulation strategy of hydropower plants is proposed to determine reasonable and feasible hydropower generation plan. The proposed model is applied to perform the day-ahead scheduling of the Gansu and Qinghai grids of China. In addition, the actual operation data and a comparison model without adaptive simultaneous peak regulation strategy are presented to verify the effectiveness of the proposed model. The results show that the model can increase the new energy power generation and decrease the power generation and output fluctuation of thermal power simultaneously, which can alleviate the new energy power curtailment of Qinghai and Gansu grids to a great extent. However, a little new energy power is still curtailed in the Qinghai and Gansu grids, a complementary coordinated operation on larger-scale interconnected power systems is needed to address the problem better.