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This paper proposes an enhanced modular multilevel converter based battery energy storage system (EMMC-BESS) for interfacing low voltage batteries to the medium or high voltage grids. Besides the distributed battery integration functionalities and the inherited advantages of traditional MMCs, EMMC-BESS also provides the DC fault handling capability. Based on analysis of operation principles, the control...
Modular multilevel converter (MMC) is one of the promising voltage source converter topologies in the field of high voltage direct current (HVDC) transmission system. Based on analysis of the existing sub-module topologies, an improved half-bridge sub-module topology based on reverse blocking IGBTs (RB-HBSM) was proposed for solving the fault ride through issues. In this paper, the fault current blocking...
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 25–30 GHz 6-bit digital attenuator with high accuracy and low insertion loss by 0.15μm GaAs PHEMT process is presented in this work. An improved structure with a parallel capacitor is applied in the attenuator architecture to enhance the attenuation accuracy. To reduce leakage of the RF signal, a cascade structure is proposed to enhance isolation and compensate the insertion loss simultaneously...
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...
A new modular multilevel converter (MMC) based static synchronous compensator (STATCOM) is proposed and hereafter called M-STATCOM. The new shunt compensator, features with the characteristics such as high modularity, availability, low generation of harmonics, etc., is well suitable for medium- or high-voltage utility grid without line-frequency transformers. M-STATCOM can not only be controlled in...
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...
Modular multilevel converter (MMC) is one of the excellent selections for high voltage and high power conversion applications without transformers. It provides the advantages such as high modularity, availability, low generation of harmonics, etc. However, the circulating current distorts the leg currents and increases the rated current of power devices, which further increases system cost. By controlling...
This paper presents a simple and low cost single-phase to three-phase cycloconverter topology for driving an induction motor with a single-phase ac supply. Only seven naturally communicated thyristors and one phase balancer capacitor are employed, so the resulting cycloconverter-motor drive system is cheap and compact. Using discrete hopping frequency technique, a single-phase to three-phase modulation...
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