A Novel Coordinated Control Strategy for VSG to Enhance Power Tracking Speed Without Degrading Inertia Support Capability

ABSTRACT The virtual synchronous generator (VSG), as a representative grid‐forming control method, has become a key technology in distributed renewable energy systems. However, there exists an inherent trade‐off between fast power reference tracking and high virtual inertia support in conventional VSG control. To solve it, this paper proposes a novel coordinated control strategy, whose first step is a power reference splitting and feedforward module. The key idea is to split the power reference into high‐frequency and low‐frequency components, where the high‐frequency component can be fed forward to the current loop reference of the VSG control, thereby improving the dynamic response. Meanwhile, the low‐frequency component serves as the mechanical power to the VSG swing equation, ensuring adequate virtual inertia support without compromising the power tracking speed. However, the direct injection of the high‐frequency component into the point of common coupling causes a disturbance to the electromagnetic power of the VSG. To mitigate this disturbance, a high‐frequency power compensation module is further proposed. The entire coordinated control strategy, comprising the above two control modules, is seamlessly compatible with conventional VSG control circuits, enabling a fast power reference response in grid‐connected mode without accurate line impedance knowledge while ensuring sufficient inertia support in standalone or weak grid conditions. Finally, simulation and experimental results validate the effectiveness of the proposed control strategy.