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Since the traditional half-bridge modular multilevel converter (HB-MMC) is endangered under DC side short-circuit faults. This paper proposes a novel sub-module (SM) topology for MMC with DC fault limitation capability. The fault current is fully transferred to the bypass thyristor by turning off all IGBTs when DC short-circuit fault occurs, then the diode freewheeling effect is eliminated and all...
A multilevel soft-switching DC-DC converter with only one resonant cell for medium voltage conversion is proposed in this paper. Two control strategies for the converter are analyzed and compared. For the proposed converter, all dc capacitors can achieve voltage self-balanced under open loop control. All switches and diodes operate in soft-switching condition without sacrificing reliability. Finally,...
A novel direct ac-ac converter based on the switched-capacitor and series resonant principle, featuring with soft switching characteristic and bidirectional power flow, is proposed in this paper. The converter consists of a LC resonant tank, switched-capacitors and reverse blocking IGBTs (RB-IGBT), resulting in small size and light weight; high efficiency is achieved by adopting soft switching technology...
A staircase modulation strategy based on modified particle swarm optimization (MPSO) algorithm is presented in this paper to solve the key problem of staircase modulation in modular multilevel converter. Firstly, each harmonic of output voltage is analyzed, and the object function is optimized. Then the modified MPSO, which has the merit of high accuracy, was adopted for calculating the switching...
This paper presents a hybrid modular multilevel converter (HMMC) based power quality controller (HM-PQC) intended for medium- or high-voltage applications. HM-PQC is characterized by cascaded connection of leg inductors and power units. Modular structure makes it easily be extended to high-level, thus leading to low voltage steps and low generation of EMI problems, etc‥ Comparing with the conventional...
The floating dc capacitor voltage of modular multilevel converter based STATCOM (M-STATCOM) contains a large amount of low-order harmonic components, which produce current ripple in leg currents, and then greatly affect the output performance and safe operation of M-STATCOM. However, fewer papers have made explicit harmonic analysis on the floating capacitor voltage of M-STATCOM. Detailed floating...
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