In this paper, a Lyapunov-based method is used in order to determine the stability boundaries of the grid-connected voltage source converter (VSC).To do itsmajorlook.com so, a state space model of the VSC is used to form the Lyapunov function of the system.Then, by using the eigenvalues of the Lyapunov function, equi-jec 6 the system stability boundaries will be determined.It is shown that the grid-connected VSC works in its stable mode when all of its Lyapunov function’s eigenvalues are positive.
The proposed model validity is tested by time-domain simulation.Simulation results show that the method is credible in determining the stability margin of the grid-connected VSC.