An Adaptive Virtual Synchronous Generator Control Strategy for VSC-MTDC Systems and Sensitivity Analysis of the Parameters

With the growth of renewable energy and power electronic converters, the whole power system's moment inertia is decreasing. As a result, the synchronous generator control (VSG) technology is important. The VSG has a virtual constant moment inertia. However, the traditional VSG method faces many challenges, such as lag, instability and insensitivity-. The need for advanced control methods to address these challenges has become increasingly urgent. In this paper, a new adaptive VSG (AVSG) control strategy is proposed. To get a more robust control, the AVSG strategy can adjust the droop coefficient and the inertia moment with the derivative of the ac-side frequency. The key parameters of the AVSG are obtained to improve the damping of the system according to the trajectory sensitivity method. A New England 39-bus benchmark system which connected to a multi-terminal high voltage direct current(VSC-MTDC) system is used to verify the efficiency of the proposed control strategy. The model was built in the DIgSIENT/Powerfactory software, and the proposed control has a good damping effect on the low frequency oscillations.