Energy Reports (Apr 2022)
SOC consensus control and analysis based on specified sampled-data for large-scale energy storage system
Abstract
In large-scale energy storage system, the large number of energy storage units leads to inconsistent of State of Charge and unbalanced sharing of output power. In order to solve this problem, a consensus control protocol design and analysis method based on specified sampled-data is proposed. The consensus of SOC and output power (normalization) of each energy storage unit in large-scale energy storage system has been achieved. Firstly, according to the definition of lithium battery SOC and discharge mechanism, a system model of large-scale energy storage system is established. Based on specified sampled-data control, consensus control protocol of multi-agent of energy storage units is designed, and system convergence analysis is carried out. Meantime, the constraints of sampling period T are derived. It is proved that local energy storage unit agent can generate local energy storage unit control signal only when it receives the state information of adjacency energy storage unit agent at a specified sampling time point. In this way, the problem of too much computation caused by the complex communication of large-scale energy storage system is solved. Considering specified sampled-data control and system requirements, the system control parameters are designed. This method is simple in control and takes up less system communication resources. Finally, the simulation results are shown that the method is effective in different application scenarios.
