Capacitor Voltage Estimation Scheme With Reduced Number of Sensors for Modular Multilevel Converters
| Autor: | Shady Gadoue, Petros Missailidis, Osama Abushafa, David J. Atkinson, Mohamed Dahidah |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
business.industry
Computer science 020209 energy 020208 electrical & electronic engineering Energy Engineering and Power Technology 02 engineering and technology Modular design Converters Inductor Capacitance Dynamic load testing law.invention Capacitor Robustness (computer science) law Control theory 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering business Voltage |
| Zdroj: | IEEE Journal of Emerging and Selected Topics in Power Electronics. 6:2086-2097 |
| ISSN: | 2168-6785 2168-6777 |
| DOI: | 10.1109/jestpe.2018.2797245 |
| Popis: | This paper presents a new method to measure the voltage across the submodule (SM) capacitors in a modular multilevel converter (MMC). The proposed technique requires only one voltage sensor per arm. This reduces the number of sensors required compared with conventional sensor-based methods. Therefore, the cost and complexity of the system are reduced, which in turn improves the converter’s overall reliability. The proposed method employs an exponentially weighted recursive least square algorithm to estimate the SM capacitor voltages through the measured total arm voltage and the switching patterns of each SM. There is thus no need for extra sensors to measure these control signals as they are directly provided from the controller. The robustness of the proposed method is confirmed via introducing deviations for the capacitance values, dynamic load changes, dc voltage change, and startup transient condition. Simulation and experimentally validated results based on a single-phase MMC show the effectiveness of the proposed method in both, steady-state and dynamic operations. |
| Databáze: | OpenAIRE |
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