Data-Driven Interarea Oscillation Analysis for a 100% IBR-Penetrated Power Grid

Abstract

In this research, a 100% inverter-based resource (IBR)-penetrated bulk power system (BPS) is examined for possible interarea oscillations. A testbed of a BPS constructed in PSCAD, with both grid-forming inverter (GFM)-based IBRs and grid-following inverter (GFL)-based IBRs, is utilized for simulation. For linear analysis, a data-driven method is used to obtain the dq admittance models of the IBRs. This information, combined with our knowledge of the network admittance, leads to eigenvalue analysis of the power grid. Furthermore, for the dominant 3-Hz mode, extended frequency-domain mode shape analysis, along with subgroup effect analysis, and network decomposition analysis are conducted. The analysis results can precisely tell the influencing factors of the oscillation mode. This mode is identified as an interarea oscillation mode. It has a different characteristics compared to the traditional electromechanical interarea mode. Specifically, the network decomposition analysis provides new insights on interarea oscillation modes. The analysis results are all confirmed by the electromagnetic transient (EMT) simulation results.

Data-driven modeling of power system dynamics: Challenges, state of the art, and future work

“…Detailed models for considering the control system according to di erent renewable energy sources (Wind turbine [68][69][70][71][72][73] , PV plant [74][75][76] , etc).Generalized VSC modelor equivalent impedance model considering mainly the inverter part [79][80][81][82] .…”

“…Another common type of methods are the impedance or admittance models in the dq frame [78] . Impedance models of IBRs are useful for existing analysis tools such as small-signal analysis [79] . Ref.…”

“…Ref. [79] describes two type of stability analysis methods based on dq admittance. With the entire system viewed as a network of admittance components, the relationship between the current injection and the nodal voltage may be expressed by the network admittance.…”

Application of Extrapolation Capability of Vector Fitting for Out-of-Band Dominant Modal Synthesis of Voltage-Source Converters

“…Although mature and powerful, the state-space method can be hindered by the devices' black/gray-box feature [6], [7]. Since the admittance/impedance model is in essence the transfer function (matrix) reformulation of the SSM with appropriate input and output variables defined, the matrix fitting (MF) and vector fitting (VF) were recently applied as the inverse solving algorithms in order to identify the SSM from the admittance/impedance frequency responses (AFRs/IFRs) of the inverter-based power systems [8]- [11]. With the help of the MF and VF, a virtual-eigenvalue-based participation factor analysis can for instance be performed on the black-box power systems.…”

Python-based Cross-platform Impedance Benchmarking Tool (CroZBenMa) for IBR's EMT Models in Matlab/Simulink and PSCAD/EMTDC

“…Concurrently, other tools like [13] and Grid Impedance Scan Tool (termed as GIST by the developers) [14] (detailed at [15]), ventured into measuring the impedance of IBR's model built in PSCAD/EMTDC but still relied on Matlab for post-processing. Another wave of tools, such as Automated Impedance Measurement (termed as AIM by the developers) toolbox [16] (accessible at [17]), Impedance SCan tool (termed as ZSC by the developers) [18], and [19], incorporated Python for both pre-and post-processing, facilitating impedance measurement in PSCAD/EMTDC without Matlab dependence. Notwithstanding these advancements, a glaring gap persists: all current tools focus exclusively on the impedance measurement of the EMT models constructed solely within one specific EMT platform.…”