A gradient-based algorithm for the state initialization of control systems

The authors present an efficient algorithm for the state variable initialization of the network and control system. This algorithm is suitable for slow transient studies in AC/DC systems. It uses gradient methods to update the integrator inputs. The network is solved by the load-flow and the control system by the Gauss-Seidel method. Following the simultaneous steady-state solutions of the combined network and control system, the initial values of the state variables describing the dynamics for each component are calculated. A computer program was developed on the basis of the proposed algorithm for the initialization of slow transient studies in AC/DC systems. Results from the initialization of a typical AC/DC system are given