Interaction Dynamics and Active Suppression of Instability in Parallel Photovoltaic Voltage-and Current-Source Converters Connected to a Weak Grid
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Bibliographic record
Abstract
Parallel operation of power electronic converters is becoming popular in utility-scale photovoltaic (PV) systems. However, the literature does not cover the interaction dynamics and stabilization of parallel PV-based voltage- and current-source converters (VSC and CSC) connected to a weak grid. To fill in this gap, this article characterizes the dynamic interactions among the parallel PV-based VSC and CSC systems considering the effects of the PV source dynamics, grid strength, operating point variation, and control parameters. A detailed small-signal model of the parallel system is developed and used to characterize the dynamic interactions using eigenvalue and input/output impedance-based analyses. The study showed that undesirable converters interactions are yielded, the dc-links stability is reduced, and the parallel system cannot inject 1.0 p.u. of active power at unity short-circuit ratio (SCR). Therefore, an active stabilization approach is proposed for the parallel VSC-CSC system to reduce the interactions, improve stability, and facilitate 1.0 p.u. of active power injection at unity SCR. Detailed nonlinear time-domain simulations and real-time simulation results verified the accuracy of the analytical results and the effectiveness of the proposed stabilization method under a wide range of operating conditions.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it