Inclusion Of Converter Controller Measurements Into State Estimation Algorithm For Hybrid Ac-Dc Grid

Hybrid ac-dc grids are one of the possible solutions to support the integration of the increasing renewable capacity into the ac grid thanks to the flexibility of voltage and power flow control that converters at the boundary buses offer. However, this requires coordinated control and accurate monitoring of the converter and the hybrid ac-dc network. State estimation is one of the traditional approaches in power systems to monitor the conditions of the grid. This paper proposes a method to include the built-in measurements of the converter controller into the state estimation of the hybrid ac-dc grid. To this purpose, the sources of measurement uncertainty in the converter controller are analyzed, and the uncertainty budget is evaluated for each of them. From this, the resulting uncertainty of the converter measurements to be considered in the state estimation model is derived. Test results on a sample hybrid ac-dc grid show the potential benefits achievable through the proposed integration of the converter measurements into state estimation-based monitoring tools.