A Two-Step State Estimation Algorithm for Hybrid AC-DC Distribution Grids

Gaurav Kumar Roy, Marco Pau, Ferdinanda Ponci and Antonello Monti
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Gaurav Kumar Roy: Institute for Automation of Complex Power Systems, RWTH Aachen University, 52062 Aachen, Germany
Marco Pau: Institute for Automation of Complex Power Systems, RWTH Aachen University, 52062 Aachen, Germany
Ferdinanda Ponci: Institute for Automation of Complex Power Systems, RWTH Aachen University, 52062 Aachen, Germany
Antonello Monti: Institute for Automation of Complex Power Systems, RWTH Aachen University, 52062 Aachen, Germany

Energies, 2021, vol. 14, issue 7, 1-21

Abstract: Direct Current (DC) grids are considered an attractive option for integrating high shares of renewable energy sources in the electrical distribution grid. Hence, in the future, Alternating Current (AC) and DC systems could be interconnected to form hybrid AC-DC distribution grids. This paper presents a two-step state estimation formulation for the monitoring of hybrid AC-DC grids. In the first step, state estimation is executed independently for the AC and DC areas of the distribution system. The second step refines the estimation results by exchanging boundary quantities at the AC-DC converters. To this purpose, the modulation index and phase angle control of the AC-DC converters are integrated into the second step of the proposed state estimation formulation. This allows providing additional inputs to the state estimation algorithm, which eventually leads to improve the accuracy of the state estimation results. Simulations on a sample AC-DC distribution grid are performed to highlight the benefits resulting from the integration of these converter control parameters for the estimation of both the AC and DC grid quantities.

Keywords: state estimation; grid monitoring; AC-DC grids; Multi-Terminal DC grids; voltage source converters (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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