Research on the active power coordination control system for wind/photovoltaic/energy storage

The renewable energy can't respond the frequency change of system because of the use of converters and its control systems, which has become a novel challenge to frequency stability of system with large-scale renewable energy. The paper give an active power coordination control system for wind/photovoltaic/energy storage system, whose principle is analyzed. When the system frequency decreases, the wind/photovoltaic/energy storage system should increase output active power, then the renewable energy is firstly used to increase output active power. When the system frequency increases, the wind/photovoltaic/energy storage system should decrease output active power, then the energy storage is firstly used to decrease output active power. The effectiveness of the proposed control can be proved.