Background: Microgrid is an effective integration mode of distributed generation (DG). It can eliminate the
negative effect caused by the intermittent DG and consume the energy locally.
Methods: For a public distribution network, a microgrid performs as a controllable and flexible unit. However, when the
public distribution network has the demand of flexible regulation, there is no reasonable quantitative indexes to evaluate
the flexibility of microgrid for dispatching decision. For this problem, the operational flexibility indexes of a microgrid
are defined in this paper.
Results: The indexes are quantified according to the maximum energy and active power regulation margin of each
flexible equipment in the microgrid. The operational flexibility of microgrid is closely related to the scheduling strategy.
Therefore the corresponding dispatching model of a microgrid is also provided in this paper.
Conclusion: Then a case study shows how to calculate and use these flexibility indexes in an operation cycle of a
microgrid system with energy storage (ES) facility and demonstrate the availability and practicability of the evaluation
indexes and the method.