Site and Size Selection Strategies of Energy Storage System Based on Power Supply and Storage Capability Index
Energy Storage System (ESS) is the implementation basis of active control in smart distribution grid, benefiting the smoothing of output power, load fluctuations, and the voltage quality. Firstly, a Supply and Storage Capacity Index (SSC) considering the variety constraints of power conversion, power flow and network topology is proposed, so as to quantitatively analyse the charging and discharging capability of ESS interconnected into power grid. Secondly, the safe operation objective function of the load transfer capability, which is based on SSC, is calculated. This can be used to evaluate the safety margin of ESS and DG integrated distribution network. Based on these, the ESS sitting and sizing problem, which considers both the system security and economics, is solved with the improved nondominated sorting genetic algorithm. The proposed method has been validated in a representative area in China, which is the pilot demonstration region in Guizhou province according to the project of research and application of intermittent energy consumption and optimization for Active Distribution Network, which is supported by the National High-tech R&D Program (863) of China.