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 advisor to semiconductor applied sciences appropriate for MMC layout, part sizing regulate, modulation, and alertness of the MMC know-how for HVDC transmission.
Separated into 3 specified elements, the 1st deals an outline of MMC expertise, together with info on converter part sizing, regulate and verbal exchange, defense and Fault administration, and time-honored Modelling and Simulation. the second one covers the functions of MMC in offshore WPP, together with making plans, technical and fiscal standards and optimization techniques, fault administration, dynamic and temporary balance. ultimately, the 3rd bankruptcy explores the functions of MMC in HVDC transmission and Multi Terminal configurations, together with Supergrids.
- Unique insurance of the offshore software and optimization of MMC-HVDC schemes for the export of offshore wind strength to the mainland.
- Comprehensive clarification of MMC software in HVDC and MTDC transmission technology.
- Detailed description of MMC elements, keep an eye on and modulation, various modeling methods, converter dynamics below 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 safety applied sciences, process experiences required for the mixing of HVDC terminals to offshore wind strength crops, and commissioning tactics for onshore and offshore HVDC terminals.
- A set of self-explanatory simulation types for HVDC try situations is out there to obtain from the better half website.
This publication presents crucial examining for graduate scholars and researchers, in addition to box engineers and pros who require an in-depth knowing of MMC technology.
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Additional info for Design, control and application of modular multilevel converters for HVDC transmission systems
The voltage of the flying capacitor should be maintained at half of the pole-to-pole dc-side voltage (which is Vd ). As evident from the figure, two of the states are again identical to the switching states of the ordinary two-level phase leg. These are labeled (a) and (d) and connect the ac terminal to either of the dc rails, whereby the terminal voltage becomes +Vd ∕2 or −Vd ∕2. By using other combinations of switches in the off- and on-states it is possible to instead force the current through the ac terminal to also flow through the flying capacitor.
This is made after a certain delay, normally referred to as the blanking time. By inserting this delay, a situation where both switches are in the on-state and the dc link is shorted, albeit temporarily, can be avoided. Such a short-circuit can otherwise lead to a current surge which may damage the switches. To make the ac outlet potential return to the positive dc rail the lower switch is first gated off. After the blanking time has passed the upper switch is again gated on, stage (d), whereby there will be a free current path from the dc-bus capacitor through this switch and the lower diode.
Thereby, the phase leg is back in the initial state and the sequence can be repeated. The commutation sequence for the case where the ac-side current is instead flowing in the opposite direction (into the phase leg midpoint) is entirely analogous, but the current will instead be commutating between the upper diode and the lower switch. It is often convenient to introduce a variable s to denote the switching state of a phase leg. e. ????s = s Vd . 2 Stages in the operation of a two-level converter phase leg.