By Kamran Sharifabadi, Lennart Harnefors, Hans-Peter Nee, Staffan Norrga, Remus Teodorescu
Design, keep an eye on and alertness of Modular Multilevel Converters for HVDC Transmission Systems is a entire consultant to semiconductor applied sciences appropriate for MMC layout, part sizing keep watch over, modulation, and alertness of the MMC know-how for HVDC transmission.
Separated into 3 special components, the 1st deals an summary of MMC know-how, together with details on converter part sizing, regulate and verbal exchange, safeguard and Fault administration, and widely used Modelling and Simulation. the second one covers the functions of MMC in offshore WPP, together with making plans, technical and financial specifications and optimization strategies, fault administration, dynamic and temporary balance. ultimately, the 3rd bankruptcy explores the purposes of MMC in HVDC transmission and Multi Terminal configurations, together with Supergrids.
- Unique assurance of the offshore software and optimization of MMC-HVDC schemes for the export of offshore wind strength to the mainland.
- Comprehensive clarification of MMC program in HVDC and MTDC transmission technology.
- Detailed description of MMC elements, keep watch over and modulation, assorted modeling techniques, converter dynamics lower than steady-state and fault contingencies together with program and housing of MMC in HVDC schemes for onshore and offshore.
- Analysis of DC fault detection and safeguard applied sciences, approach stories required for the combination of HVDC terminals to offshore wind energy crops, and commissioning methods for onshore and offshore HVDC terminals.
- A set of self-explanatory simulation types for HVDC try situations is on the market to obtain from the significant other website.
This ebook presents crucial studying for graduate scholars and researchers, in addition to box engineers and execs who require an in-depth knowing of MMC technology.
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Extra info for Design, control and application of modular multilevel converters for HVDC transmission systems
The switching processes inside the MMC normally only involve one submodule at a time. Compared to the two-level converter, which switches the full pole-to-pole voltage at once, this implies a great improvement. In addition to the many benefits in terms of harmonic performance obtained by multilevel operation, the fact that only a small fraction of the direct voltage is switched simplifies the design of the converter. The steepness of the voltage flanks (d????∕dt) during switchings is considerably reduced.
9 Flying capacitor converters, (a) one phase leg (generic schematic for an arbitrary number N levels), (b) three-phase three-level converter. otherwise. At opposite direction of the ac-side current the states are interchanged. Thus, it is always possible to correct a deviation in the flying capacitor voltage in the next switching cycle. It should therefore generally only contain harmonics from the switching frequency and upwards. These are low in amplitude, owing to the low impedance of the capacitor at these frequencies.
This makes the mechanical design of the converter more complex. For a high-voltage converter this is particularly undesirable since in this case large mechanical clearances have to be observed, owing to the insulation requirements present. The three-level NPC converter, on the other hand, is being used extensively in medium-voltage applications, mainly high-power motor drives for industry. They are also used in railway traction converters and for the grid integration of wind turbines. 7. 6 Diode clamped converter topologies.