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| Content Provider | IET Digital Library |
|---|---|
| Author | Nademi, Hamed Norum, Lars |
| Abstract | This study presents a detailed time domain model of a modular multilevel converter (MMC) to provide an alternative form of evaluation of the converter dynamic performance, for example, during AC or DC fault conditions. The purpose of the model is to accurately reflect the converter behaviour to be used in control systems design. It can also be beneficial to predict the steady state or transient state of the converter with fixed or variable inputs. In an MMC, the capacitor voltages are modulated using pulse-width modulation (PWM) to fabricate a sinusoidal output voltage. With time, and because of the PWM action, the capacitors get charged or discharged. Therefore the circuit behaves as a time-variant circuit. The analysis is based on the equivalent circuit derived from the converter differential expressions at any time instant in a piecewise fashion. The usefulness and accuracy of the theoretical study is validated for the three-phase MMC topology by simulation results with respect to normal operation, start-up process, cell short-circuit fault, line-to-ground and DC-side fault conditions. Experimental tests are carried out through a scaled-down laboratory prototype. |
| Starting Page | 1625 |
| Ending Page | 1635 |
| Page Count | 11 |
| ISSN | 17554535 |
| Volume Number | 8 |
| e-ISSN | 17554543 |
| Issue Number | Issue 9, Sep (2015) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-pel/8/9 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2014.0559 |
| Journal | IET Power Electronics |
| Publisher Date | 2015-04-28 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | AC Fault Condition Analytical Circuit Oriented Modelling Capacitor Voltage Cell Short-circuit Fault Control System Design Converter Differential Expressions Converter Dynamic Performance Dc Fault Condition Equivalent Circuit Fault Diagnosis Fixed Input Line-to-ground Fault Condition Mathematical Analysis Modular Multilevel Converter Normal Operation Performance Assessment Piecewise Fashion Power Converter Power Supplies to Apparatus Pulse Width Modulation PWM Action PWM Power Converter Scaled-down Laboratory Prototype Sinusoidal Output Voltage Start-up Process Steady-state Analysis Three-phase MMC Topology Time Domain Analysis Time Domain Model Time-variant Circuit Transient State Variable Input |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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