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This paper introduces the comprehensive evaluation results of SiC-Based high power density inverter. The power density of the developed inverter is about 70kW/liter in volumetric, 50kW/kg in gravimetric. The inverter is forced air cooling 2-level voltage source inverter. In order to achieve higher power density than conventional inverters, we need to reduce losses of inverters or improve cooling performance...
Recently, kHz-class frequency components with several kW power are widely used in industry applications and home appliances. Wireless power transmission system and induction heating demand for over 20 kHz sinusoidal current waveforms. Furthermore, higher-switching frequency inverter are discussed for realizing high-power density circuit and reducing passive components, EMI filter and switching ripple...
The adoption of silicon carbide (SiC) MOSFETs and SiC Schottky diodes in power converters promises a further improvement of the attainable power density and system efficiency, while it is restricted by several issues caused by the ultra-fast switching, such as phase-leg shoot-through (‘crosstalk’ effect), high turn-on losses, electromagnetic interference (EMI), etc. This paper presents a split output...
In power electronics applications with power ratings around several kilowatts, wide band gap semiconductors are more and more replacing state-of-the-art Si MOSFET. SiC MOSFETs with blocking voltage rating up to 1200V and low-voltage GaN devices are already commercially available on the market since a couple of years. Now also 600V GaN devices are entering the market, which are a cost-effective solution...
As modular multilevel converter high-voltage direct current system (MMC-HVDC) is widely used, its auxiliary power supply (APS) needs the DC input ultra-high voltage (kV class) and the DC output low voltage, which is used for supplying power to the drive and control modules. Firstly, this paper designed an ultra-high voltage flyback power supply based on the serialization of SiC MOSFETs. Secondly,...
The wavelet PWM (WPWM) technique has been applied in the two-level inverters successfully, but it is impossible to apply directly the WPWM technique to multilevel inverters. This paper proposes two kinds of WPWM techniques suitable for a cascaded multilevel inverter, analyzes the control strategy with the WPWM and obtains the design of its parameters. The simulation results show the proposed WPWM...
In order to reduce the computational complexity of conventional single-phase multilevel space vector pulsewidth modulation (SVPWM) strategy and resource consumption of micro controller chip, a simplified SVPWM strategy adopted for single-phase 5-L/7-L converter is proposed. The proposed strategy simplifies the calculation of single-phase 5-L/7-L SVPWM to single-phase 3-L SVPWM by dividing the voltage...
This paper focuses on the modulation strategy optimization of an isolated modular multilevel DC/DC converter (IMMDC). IMMDC sub-modules' dc capacitor and arm inductor has an inherent resonance condition, which leads to high oscillation in arm current dc component. Traditional two-level or quasi two-level phase shift operation has no damping capability to this resonance. In this paper, a novel modulation...
The isolated modular multilevel dc-dc converter (IMMDCC) constructed by two MMCs and a medium frequency transformer is attractive for medium-and high-voltage dc-grid applications by offering the following features: the modular multilevel structure provides the capability to handle high voltages with the series connection of lower voltage submodules; the utilization of the square-wave operating mode...
Modular Multilevel Converter-Bidirectional DC-DC Converter (MMC-BDC) is suitable for high voltage and high power application. This paper designs a kind of six-module-cascaded MMC-BDC applied to mass rail transit. Based on carrier phase-shifted (CPS) modulation, a dual-loop control strategy consisting of a common current loop and an individual voltage loop is proposed. It is able to realize both bidirectional...
A weighted controller structure for DC-DC converters is proposed to deal with large-signal operations. For wide range variations of input voltage and load conditions of DC-DC converters, we firstly divide the pre-defined global operation space into local subspaces where each local linear compensator is designed for the corresponding subspace, and then all the local linear compensators are weighted...
Dual Active Bridge (DAB) converters offer an unmatched capability to transfer energy in either direction between two DC sources. However, an unrecognised problem with these converters is their potential for parasitic DC link inductances to cause substantial DC bus ringing, filter stress and consequent operational failure when excited by modulated current harmonics. This paper explores this problem...
This paper introduces an improved isolated three-level (TL) DC-DC converter for battery charger. Conventional TL DC-DC converters usually have one transformer for isolation. Simultaneously, large circulating current freewheels at the primary of the transformer, which lowers the efficiency. A TL DC-DC converter with two transformers to reduce the circulating current is proposed in this paper for battery...
This paper proposes an optimal control method of clamp switch for ZVS bi-directional DC-DC converter. The bidirectional DC-DC converter using the clamp switch can achieve zero voltage switching (ZVS) operation. In this topology, the clamp switch separates the inductor current from input and output voltage and maintains minimum current for ZVS operation. The separation of the inductor current can reduce...
This paper presents a novel modulation technique for a three-phase dc-dc converter with bi-directional power transfer capability. The topology is geared towards dc microgrid and fuel cell vehicle applications, where a high step-up ratio converter is required to enable efficient energy exchanges between two dc buses of different voltage magnitudes. The proposed converter achieves zero-current switching...
This paper investigates an induction machine using a novel concept of rotating converter. The stator is directly connected to the grid while the rotor is fed by a rotating converter with a floating capacitor over the dc-link. An analytical method to find the operating point at specific power factor and torque is proposed in this paper, which is verified by the good agreement between calculation and...
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