Efficient Modeling of an MMC-Based Multiterminal DC System Employing Hybrid HVDC Breakers
2015 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 30, no 4, 1792-1801 p.Article in journal (Refereed) Published
The feasibility of future multiterminal dc (MTDC) systems depends largely on the capability to withstand dc-side faults. Simulation models of MTDC systems play a very important role in investigating these faults. For such studies, the test system needs to be accurate and computationally efficient. This paper proposes a detailed equivalent model of the modular multilevel converter (MMC), which is used to develop the MTDC test system. The proposed model is capable of representing the blocked-mode operation of the MMC, and can be used to study the balancing control of the capacitor voltages. In addition, the operation of the MMC when redundant submodules are included in the arms can also be studied. A simplified model of a hybrid high-voltage dc breaker is also developed. Hence, the developed test system is capable of accurately describing the behavior of the MMC-based MTDC system employing hybrid HVDC breakers, during fault conditions. Using time-domain simulations, permanent dc-side faults are studied in the MTDC system. In addition, a scheme to control the fault current through the MMC using thyristors on the ac side of the converter is proposed.
Place, publisher, year, edition, pages
IEEE , 2015. Vol. 30, no 4, 1792-1801 p.
DC-side faults, HVDC breaker, HVDC transmission, modeling, modular multilevel converter (MMC)
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject SRA - Energy
IdentifiersURN: urn:nbn:se:kth:diva-172681DOI: 10.1109/TPWRD.2015.2398825ISI: 000358503900017ScopusID: 2-s2.0-84937948815OAI: oai:DiVA.org:kth-172681DiVA: diva2:850280
QC 201509012015-09-012015-08-272016-02-25Bibliographically approved