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As an ideal power supply, the advanced traction power supply system (ATPSS) is approved to totally remove the neutral sections and promote the power quality, which is a new direction development for traction power supply system. The existing ATPSS based on three-phase to single-phase converter needs to match the step-up transformer. The output current of this system is so heavy that it requires parallel...
For the operation of autonomous microgrids, it is a major task to share the load demand economically. This paper proposes an economic operation method of microgrid for feeder power-flow optimization, taking into consideration the generation costs of the micro-sources and power loss in the transmission line. A detailed analysis of the cost-based nonlinear droop control scheme of micro-source inverter...
For grid-connected renewable energy equipment, asymmetrical high voltage swell threatens the grid-side converter (GSC) and the dc-link capacitor. Asymmetrical high voltage swell may cause significant fluctuations across the dc-link voltage, and energy reflux of the GSC, even result in the runaway of the GSC. To cope with this situation, the control strategy of the GSC has to be improved. Firstly,...
The aim of the paper is to compare the design of direct-drive permanent-magnet (PM) generators associated with horizontal axis tidal turbines. The turbine/generator couplings are examined. These turbine/generator couplings consist of a POD and Rim-driven assembly. In a Rim-Driven association the electrical generator active parts are inserted in a duct surrounding the blades. For POD generator insertion,...
To investigate the input impedance of digital-controlled bi-directional DC/DC converters, this paper develops a modeling method based on the sampled-data approach. Because the nonlinear pulse-width modulator generates sideband components, the sideband effect occurs in a closed-loop converter. And the sampling process of a digital controlled system can significantly influence the sideband components...
As the distributed generators are connected together through inverter interface in the microgrid, the control of the control of the interface inverter has an important influence on the operating performance of microgrid. In the paper, the study focuses on the control of the interfaced inverter, when microgrid operates in the islanded mode. In order to make the microgrid property similar to the utility...
The adoption of virtual synchronous generation (VSG) control can maintain the stability of voltage and frequency in power electronic interfaced mircogrid. In this paper virtual impedance is added to the VSG control strategy in order to improve the system control performance in resistive-inductive line impedance, the influence of virtual impedance on VSG system stability and dynamic performance is...
Because of high cost of battery, BESS is not suitable for the situation when the demand of active power is less than that of reactive power. A novel STATCOM based on the hybrid cascaded multilevel converter is proposed to provide limited active power support. Meanwhile, this topology doesn't have the drawback of cascaded H-bridge BESS. The characteristic of output power for this topology is studied...
This paper focuses on the currents supply waveforms of a non-conventional electrical machine - Doubly Salient Permanent Magnet Generator (DSPMG) (10 kW, 50 tr/min), which is dedicated to marine tidal current applications. A dynamical dq model is firstly developed. Then, classical sinusoidal and quasi sinusoidal current waveforms are all applied for DSPMG to minimize the torque ripples and to analyze...
This paper describes newly developed T-type full-leg IGBT modules, specifically designed for mega-solar inverter application of higher DC-input voltage, such as DC 1000V input. The newly developed 900V voltage class authentic RB-IGBTs are installed in the power module, which have significant advantages in switching performance when compared to the alternative method 1200V standard IGBT and reverse...
In this paper, a new GaN-based integrated module is designed to solve the problems encountered in the application of GaN devices, such as large parasitic inductance and thermal management problems. The layout of the integrated module is optimized to reduce the parasitic inductance. At the same time, different kinds of substrates are compared and the size of integrated module is studied. Finally, simulation...
A new Buck-Boost multilevel inverter is proposed. The proposed inverter is derived from Buck-Boost converter, which is with the ability to buck/boost the input voltage. This is much suitable for the application with wide range varied DC link voltage, such as renewable energy generation. The topology and operate principle of the Buck-Boost multilevel inverter is presented. And the current sharing with...
Under unbalanced grid voltage conditions, negative-sequence will generate the double fundamental frequency in the dq synchronous rotating reference frame. In order to detect the positive-sequence component of the grid voltages fast, this paper proposes a new phase-locked loop method, called double fundamental frequency phase-locked loop (DFF-PLL). The operation principle is analyzed, giving the extract...
A new concept, non-gate dielectric film (NGD film) is proposed, to describe the special role of anode insulator film on a recently reported power semiconductor, IEC-GCT. Thermal reliability analysis, including thermal stress and heat conductivity, show that aluminum nitride, polycrystalline silicon and borosilicate glass are more suitable as anode non-gate dielectric film than SiO2. Thermal stress...
Since the loss of input rectifying diode bridge in the conventional PFC converter reduces the efficiency, the bridgeless PFC converter has been proposed. The totem-pole bridgeless PFC converter is the most representative one. However the common mode noise current occurring around the input voltage zero-crossing brings severe EMI problem restricts its practical application. In order to improve noise...
For a Voltage Source Converter based High Voltage Direct Current Transmission(VSC-HVDC)system the most important part is the VSC part because it determines main performance of the whole system. This paper proposed a new topology of PWM AC/DC converter which is cascaded VIENNA rectifier. In addition, in this paper a current controller based on the working modes of three-phase VIENNA rectifier will...
The 1700V/400A hybrid module is consisted of Si-IGBTs and SiC-SBDs mounted in a general 2in1 package. Because the reverse recovery current of SiC-SBD is very small to be an unipolar device, reverse recovery and turn-on losses at 400A on the hybrid module are 83% and 38% lower than that of the conventional all Si module, respectively. Therefore there is a further advantage of hybrid module at high...
The resonance problem in multi-paralleled grid-connected inverters in microgrid is more complex than single one. The Norton's equivalent circuit associated with grid-connected inverter with LCL filter is figured out in this paper. And in terms of different reasons of causing resonance, resonance problems associated with multi-paralleled grid-connected inverters are categorized into three types: individual...
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