Analysis of an Online Stability Monitoring Approach for DC Microgrid Power Converters
| Autor: | Paolo Mattavelli, Tommaso Caldognetto, Paolo Magnone, Aram Khodamoradi, Guangyuan Liu |
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| Rok vydání: | 2019 |
| Předmět: |
Stability criteria
Monitoring frequency estimation Computer science 020208 electrical & electronic engineering Automatic frequency control Phase margin Digitally-controlled power converters 02 engineering and technology Perturbation methods Converters Power system stability DC-BUS dc microgrids Frequency control stability monitoring 0202 electrical engineering electronic engineering information engineering Electronic engineering Digital control Microgrid Microgrids Electrical and Electronic Engineering Loop gain |
| Zdroj: | IEEE Transactions on Power Electronics. 34:4794-4806 |
| ISSN: | 1941-0107 0885-8993 |
| DOI: | 10.1109/tpel.2018.2858572 |
| Popis: | An online approach to evaluate and monitor the stability margins of dc microgrid power converters is presented in this paper. The discussed online stability monitoring technique is based on the Middlebrook's loop-gain measurement technique, adapted to the digitally controlled power converters. In this approach, a perturbation is injected into a specific digital control loop of the converter and after measuring the loop gain, its crossover frequency and phase margin are continuously evaluated and monitored. The complete analytical derivation of the model, as well as detailed design aspects, are reported. In addition, the presence of multiple power converters connected to the same dc bus, all having the stability monitoring unit, is also investigated. An experimental microgrid prototype is implemented and considered to validate the theoretical analysis and simulation results, and to evaluate the effectiveness of the digital implementation of the technique for different control loops. The obtained results confirm the expected performance of the stability monitoring tool in steady-state and transient operating conditions. The proposed method can be extended to generic control loops in power converters operating in dc microgrids. |
| Databáze: | OpenAIRE |
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