The Analysis of VSG Control Algorithm Based on Hamiltonian System

Due to the intermittence and fluctuation of the output power of the distributed generations, the low inertia and under-damping characteristics of traditional electronic inverters may bring negative effects to the power system stability. In order to provide suitable inertia and damping ratio to suppress the oscillation of the power system, a virtual synchronous generator control algorithm based on dissipative Hamilton control was designed in this paper by using the third-order synchronous generator model with the consideration of valve and excitation. And ADRC technology was applied to eliminate the coupling in the voltage and current control system. Finally the proposed control algorithm was verified by simulation results based on DIgSILENT/PowerFactory. The results show that the proposed control algorithm can significantly improve the robustness of the system, suppress the oscillation, provide virtual inertia and positive damping ratio, and eliminate the perturbation and coupling of parameters. © 2017, Power System Technology Press. All right reserved.