A coordinated frequency regulation strategy integrating wind farms with distributed energy storage

Abstract

Commencing with the dynamic characteristic optimization of frequency regulation of wind energy storage systems， this study delves into a coordinated frequency regulation strategy between energy storage systems （ESS） and wind farms， taking into account the state of charge （SOC）. Firstly， it investigates the strategy of differential inertia support using variable-ratio speed regulation of the doubly-fed induction generator （DFIG） under varying wind speeds. Subsequently， a two-tiered coordinated control approach is employed to determine the power command to synchronize distributed energy storage with wind farm frequency regulation. Then， with the energy storage SOC as a state variable， a strategy for allocating frequency regulation power commands is proposed based on a consensus algorithm. This strategy considers the disparities in energy storage SOC and power regulation capabilities， facilitating power allocation for distributed energy storage based on SOC status. Finally， the efficacy of the proposed strategy is validated through simulation. The findings demonstrate that this strategy effectively coordinates distributed energy storage with wind farms to provide frequency response， swiftly recovering the operation mode of maximum power point tracking （MPPT） of wind turbines and thereby averting secondary frequency disturbances in the system.

Keywords

• wind energy storage system
• distributed energy storage
• frequency regulation
• coordinated control
• consensus algorithm