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This paper proposed a novel flying-capacitor-clamped five-level inverter based on bridge modular switched-capacitor topology. The inverter features the switched-capacitor circuit with step-up ability and the multilevel inverter circuit with flying-capacitor-clamped performance. With the composite structure, the number of components is cut down compared with the topology of conventional multilevel...
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 new bidirectional multilevel converter topology called Hybrid Multilevel Converter (HMC) suitable for high power AC/AC applications is presented. It is based on cascaded connection of multiple half-bridge submodules in addition to nine thyristor-based low-frequency and soft-switched unfolders in a three-phase version. Compared with a conventional modular multilevel converter (MMC), HMC requires...
In order to reduce output voltage harmonics and improve efficiency, a symmetrical hybrid nine-level inverter for high speed open-winding motor drive system is presented in this paper. Each phase of this inverter is composed of a five-level DC/DC converter and an H-bridge. The DC/DC converter is operated at high frequency with low voltage MOSFETs and the H-bridge is operated at fundamental frequency...
Multi-level converters are widely employed in medium voltage grid-connected PV systems, since they feature better power quality and higher conversion efficiency compared with two-level converters. The conventional two-stage PV converter configuration with additional high step-up elements can satisfy the wide input voltage requirements, but results in reduced conversion efficiency and increased cost...
This paper presents a novel single-stage AC/DC converter that can achieve high power factor with reduced switching losses for semiconductor devices. The topology is derived by integrating the interleaved boost-type PFC and full bridge LLC resonant converters. Due to interleaving at the input, the converter exhibits less input current ripple compared to the existing single stage topologies. Therefore,...
In this paper, a novel ac/dc converter is proposed for low voltage, low power rectification applications. The proposed converter manages the energy harvested from micro-scale electromagnetic transducers. It integrates the conventional Boost and Buck-Boost topologies with a shared inductor, a bidirectional switch and two split filtering capacitors. The Boost and the Buck-Boost topologies function in...
Modular Multilevel Converters (MMC) can provide significant advantages for power transmission applications, however there are remaining challenges trading off DC fault response, losses and controllability. Alternative multilevel converter topologies using combinations of full bridge and half bridge submodules or series switches allow for competitive efficiency whilst retaining control over the DC...
This paper presents a novel three-phase high-frequency isolated DC-DC converter topology for offshore wind energy systems. The primary side of the converter consists of three half-bridge legs connected to three single-phase star-connected transformers. Each transformer secondary has a full-bridge rectifier and their outputs are connected in series. Constant frequency phase-shift modulation scheme...
Use of renewable sources of energy for charging of electric vehicle(EV) batteries have generated tremendous interest. The use of off-board DC chargers to reduce the weight and increase space inside an electric vehicles has been an important area of interest. Harvesting solar energy to charge electric vehicle batteries can result in large inefficient systems when multiple power conversion stages are...
The family of Modular Multilevel Converter (MMC) has become one of the most promising converter topologies for medium/high-voltage applications because of its modularity and scalability. Specifically, the AC-AC MMC is a promising candidate for medium-voltage motor drive applications. As the AC-AC MMC is based on stacking a large number of Submodules (SMs), its operation is vulnerable to SM failure...
In the transformerless grid connected photovoltaic system, the inverter is the main component. In order to improve the efficiency of the inversion system and achieve a low level of leakage current, several topologies have been applied, among which three level NPC inverter is a kind of popular application. Because the three level NPC inverter has the advantages of low switching losses, good common...
This paper analyzes a cost-effective modification of the rectifier plus boost converter power topology which is commonly found in small wind turbine systems. The paper proposes removing the input capacitor after the rectifier and the boost converter inductance. This will be done without adding any LC filter between the permanent magnet generator and the passive rectifier. This paper discusses both...
A new galvanically isolated DC-DC converter has been presented in this paper. The proposed topology is based on the quasi-switched-boost impedance network. It not only includes all positive characteristics of previous converters including continuous input current, high boost ability and high efficiency, but also has the prominent features of less passive elements utilization, small size and light...
This paper proposes a control scheme composed by a linear control and a predictive algorithm with extended horizon for a three-level neutral-point-clamped (NPC) inverter topology for grid-tie photovoltaic applications. The proposed strategy is capable to balance the capacitor voltages at the DC link and to generate a sinusoidal current at the grid side with a unitary power factor. Differently to other...
In this paper, a new power electronics interface topology for Direct Drive Wind Turbines (DDWTs) to improve the system reliability and with a potential to decrease the size of the Permanent Magnet (PM) generator is presented. In the proposed topology the grid-side Voltage Source Converter in a traditional DDWT is replaced by a three-phase single-stage boost inverter. This enables the use of a low-voltage...
Modular multilevel converter (MMC) is an attractive topology for transformer-less high voltage applications due to its capability to reach high voltage levels by the use of power semiconductors. Each submodule can be considered as a controlled voltage source where capacitor's voltage should be maintained at a certain level for proper operation of the MMC and for fault detection and protection purposes...
Transformer-less PV inverters are gaining widespread applications with lower cost, reduced footprint, and improved efficiency. This paper proposes a topology that can eliminate the common mode leakage current which is a major challenge in transformer-less PV inverters. In addition, an active power decoupling strategy is implemented in this topology instead of using large energy storage element for...
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...
This paper investigates a new reconfigurable switched-capacitor (SC) based partial power architecture which enhances the performance of radio frequency (RF) resonant DC/DC converters with gallium nitride (GaN) power devices. The proposed architecture has a comprehensive compatibility with existing RF and SC topologies and improves the performance of RF converters through partitioning of energy conversion...
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