Adaptive Weighted Least Squares-Based Algorithm to Estimate Synchronized Measurements over Wide Frequency Range

International audienceThis paper proposes a frequency-adaptive weighted least squares-based algorithm for accurate identification and estimation of synchronized measurements over wide frequency range. A new mathematical formulation is performed to estimate all synchronized components of a single-phase voltage or current input signal when spurious frequency as harmonics and off-nominal suchfrequency, within the range of 5 Hz around the fundamental frequency, are presented. The proposed algorithm decouples local system frequency estimation and synchronized components tracking, in which the static off-nominal frequency is estimated from the classical method based on the rate of change of phase angle relative to the offset from fundamental frequency whose outcome is used to calculate a new sampling angle that is utilized in the computation of the synchronized components. Several noisy signals are applied to evaluate the algorithm’s performance results obtained where the demonstrate the capability of the proposed algorithm in dealing efficiently with very corrupted signals. The algorithm is envisaged for M-Class Phasor Measurement Unit (PMU) aiming to improve the power quality issue of power distribution systems

Towards Scalable FMI-based Co-simulation of Wind Energy Systems Using PowerFactory

Due to the increased deployment of renewable energy sources and intelligent components the electric power system will exhibit a large degree of heterogeneity, which requires inclusive and multi-disciplinary system assessment. The concept of co-simulation is a very attractive option to achieve this; each domain-specific subsystem can be addressed via its own specialized simulation tool. The applicability, however, depends on aspects like standardised interfaces, automated case creation, initialisation, and the scalability of the co-simulation itself. This work deals with the inclusion of the Functional Mock-up Interface for co-simulation into the DIgSILENT PowerFactory simulator, and tests its accuracy, implementation, and scalability for the grid connection study of a wind power plant. The coupling between the RMS mode of PowerFactory and MATLAB/Simulink in a standardised manner is shown. This approach allows a straightforward inclusion of black-boxed modelling, is easily scalable in size, quantity, and component type