A Scheduling Methodology For Interconnected Power System Considering Renewable Energy Access

The aim of energy internet is to realize the utilization and shearing of large-scale renewable energy. The utilization of renewable energy is achieved by converting it to electric power, and the shearing of large-scale renewable energy is realized by transferring electric power in a long distance in power transmission network. This paper proposes a consumption strategy for new energy in transmission network to realize the coordination and sharing in a wide-area. And use the technic of robust optimization to mitigate the impact of renewable energy uncertainty.A new kind of tie-line dispatching mode——traditional tie-line dispatching combined with wind power consumption is given in this paper. The dispatching plan of tie-line power flow is divided to a Planned Value and an Adjusted Value. Meanwhile,reserve capacity can be transferred from one area to another by adjusting the tie-line power in interconnected power system to take full advantage of the spare capacity of each region. An interconnected power system robust scheduling model is proposed and an improved nonlinear cutting plane method is put forward and used to solve this model.The example results show that the proposed wide-area coordination and consumption strategy of new energy can improve the economy of the interconnected system, in the meantime ensure the robustness.For the demand of energy-saving and emission-reduction, the component which reflects the emission of sulfur dioxide is added to objective function. By choosing a reasonable weight of each component, the objective function which can reflect the comprehensive performance of power system is built. A robust environmental protection scheduling model for interconnected power systems is established and solved.Case study shows that the total fuel cost increases and the pollution gas emission decreases after adding the component related to pollution gas emission to the objective function. Also both fuel cost and pollution gas emission of interconnected power system decreases by adjusting the tie-line power.