Currently, research on the control of wind power and energy storage to participate in frequency regulation and configuration of the energy storage capacity is at its nascent stage. Similar to wind generators, energy storage can be involved in system frequency regulation through additional differential-droop control.
The coordinated frequency regulation control system of wind energy storage can make each part of the system operate safely, economically and stably on the basis of stabilizing the system frequency.
This manuscript provides a strategy for energy storage to coordinate wind farms to participate in primary frequency regulation of power system, and compares three frequency regulation schemes of wind power reserve, rotor inertia control and wind farm with energy storage. The comparison results show that: Wind power reserve is the least economic.
The energy storage system can increase and decrease the output flexibly, which can improve the frequency regulation characteristics of the power system with wind power. Therefore, wind farms can build energy storage power stations with a certain capacity and undertake the task of frequency regulation.
In the power systems with high proportion of renewable power generation, wind turbines and energy storage devices can use their stored energy to provide inertia response and participate in primary frequency regulation for the improved system frequency stability.
In Section 3, the energy storage capacity is configured based on the system frequency regulation demand, and a wind-storage coordinated frequency regulation control strategy is proposed, which makes reasonable use of the frequency support potential of wind power and energy storage and ensures the dynamic stability of the system frequency.