Abstract:
With the continuous deepening of the global energy transition, the grid-connected capacity of new energy sources such as wind power and photovoltaic power expands year by year, leading to continuous attenuation of the synchronous rotational inertia of power systems. Traditional grid-following new energy units are decoupled from power grids via power electronic converters, which inherently lack the capability of autonomous frequency support and greatly weaken the anti-disturbance capacity of power grids, and severe safety risks including significant frequency deviation and transient instability are highly likely to occur under operating conditions such as sudden load changes and line faults. Major research advances covering inertial response and primary frequency regulation of wind-storage hybrid systems, coordinated control of doubly fed induction generators (DFIGs) and synchronous generators, virtual synchronous generator (VSG) technology, optimal allocation of energy storage capacity, as well as the grid adaptability under high renewable penetration are systematically reviewed, and the application performances of diverse control strategies in frequency support, economic efficiency and grid adaptability are summarized. Firstly, the application paths of mainstream control strategies for inertial response and primary frequency regulation are sorted out in detail, the operating mechanisms of typical schemes including virtual inertia emulation, rotor kinetic energy release, overspeed load reduction and pitch angle regulation are elaborated, and the supporting effects of different control methods in restraining frequency drop and shortening disturbance recovery time are compared. Secondly, the coordinated control of DFIGs and synchronous generators is discussed, and the prominent advantages of VSG control technology in reproducing the external characteristics of synchronous generators and improving the transient frequency stability of power systems are analyzed emphatically. Thirdly, relevant research achievements in boosting the frequency regulation efficiency and economic performance of energy storage systems through multi-objective optimization and capacity configuration are investigated. Finally, the adaptability of wind-storage systems in high-penetration power grids is analyzed, with particular focus on the application of grid-forming control and distributed control in complex grid environments. This review establishes a comprehensive research framework of wind-storage joint frequency regulation technologies, which can provide complete theoretical basis and technical references for the design of wind-storage combined equipment, optimization of control strategies, planning of energy storage capacity and implementation of engineering demonstrations in power systems with high penetration of renewable energy, and facilitates the construction of stable and efficient modern power systems in the future.