Coordinated Planning And Operation Of Energy Storages Across Wide Area To Enhance The Regional Output Capability Of The Renewable Energies

Due to the environmental issues and public awareness of sustainability, reconstructing the mix of energy resources and increasing the share of renewable energy have been promoted to the national strategic vision. The increasing penetration of renewable energy in power systems, however, yields to various issues in secure and stable operation. This problem becomes even worse for those centralized wind or solar plants, which are usually far from the load centers. Energy storage technology is believed to be one of the most promising ways to solve the problems caused by the fluctuation of the renewable sources. But, so far, energy storage technology can barely meet all the needs of power systems with good techno-economic feasibility. Thus, the storage systems have to be optimally planned and operated for the best usage.In this paper, first, application of energy storage in power systems with renewable energy are analyzeed and literatures on current researche on planning and operation are surveyed. Then the approach for planning wide-area storage system, which includes battery and pumped storage, for power systems with large-scale wind integration is proposed. Storage systems are optimally sited and sized in the power system. The optimal unit commitment is proposed, considering different storage systems located in wide area. Thermal unit, hydro turbine and gas turbine are considered in the planning and operation. Test results on IEEE 14 bus system show the effectiveness of proposed planning and operation methods. On this basis, optimal storage system capacity and layout for Gansu power grid is calculated. Practical case studies are investigated. Results show that storage systems help to reduce the wind curtailment and coal consumption. At last, software for storage planning and operation is developed. The human-machine-interface is designed.