Aiming at energy management system(EMS)and coordination control system(CCS)for adapting to flexible adjustment of microgrid cluster control strategy at variable operation states

a real-time operation state evaluation model of low-voltage microgrid cluster based on fuzzy least squares support vector machine(FLS-SVM)is proposed. With traditional power system operation state description method

the proposed model builds constraints in secure and normal operation of microgrid cluster and microgrid. Microgrid states are classified in view of multi-dimensional eigenvector including voltage deviation rate

energy storage state of charge

energy storage charge and discharge time

power generation and load. The real-time operation states of microgrids are evaluated with FLS-SVM

and then the operation states of microgrid cluster can be determined. Case study shows that the method can conduct the real-time evaluation within the sampling period of the system

and classify the operation states of microgrids accurately and effectively under the conditions of both off-grid and on-grid. It can provide the basis for microgrid cluster to quickly determine the operation state and flexibly adjust control strategy.