To realize the efficient and stable operation of new energy power generation systems

it is especially critical for the grid-connected converters to have the adaptive ability to cope with the changes in the source and grid sides. This adaptive ability can be characterized by flexibility

so it is crucial to scientifically assess the flexibility level of the grid-connected converter under different operating conditions. This paper proposes applying the entropy weight method to the flexibility assessment of grid-connected converters

and initially explores the flexibility assessment system of grid-connected converters

taking the active and reactive power outputs and considering the small-signal stability and transient stability as the flexibility indexes. Based on the actual application of high-power grid-connected converters

the flexibility index data under different grid conditions

control strategies and overcurrent capabilities are analyzed to scientifically assess the flexibility level of grid-connected converters

reveal the lack of flexibility of grid-connected converters with a single control algorithm

and provide a theoretical basis for the design of flexible grid-connected converters with adaptive control strategies.