Improved virtual synchronous generator control strategy for seamless switching

To reduce the dynamic impact of seamless switching between the converter and diesel generator and improve the stability of the whole system, an improved virtual synchronous generator (VSG) control strategy is proposed in this paper. It introduces the engine governor control and the active power adjustment link into the VSG control strategy. Therefore, the angular frequency characteristics of the converter based on the improved VSG control strategy can be similar to the diesel generator, and it can make the converter possess strong rigid. Then, the virtual impedance is introduced to reduce the influence of power coupling of the converter, which is suitable for the improved VSG control strategy. Simulation model and corresponding experiment platform are established for test. Simulation results demonstrate the superior performance of the improved VSG control strategy, and experiment results validate the validity of the improved VSG control strategy.