Continuous Time-Based Operation Method for Energy Storage under Large Penetration Level of Renewable Energy

The introduction of renewable energy will result in system load imbalance. Energy storage can accommodate the high penetration level of renewable energy. However, the existing discrete time-based operation method cannot accurately reflect the evolution of renewable energy. Accordingly, the energy storage does not get to make use of the well. This paper provides a continuous time-based operation method for energy storage under the large penetration level of renewable energy. Different with the conventional discrete time-based operation method, there is no need to divide the whole dispatch time duration into multiple discrete intervals. We illustrate the concept of continuous time-based operation method for energy storage and provide the corresponding mathematical model based on differential equations. Then, the Bernstein polynomial is adopted to linearize the primal problem into a linear problem. The proposed method is tested on the IEEE-RTS 79 system. Numerical results illustrate the effectiveness of the proposed method in making full use of energy storage. Compared with the conventional discrete time-based method, the proposed method can accurately consider the change of renewable energy.