In this article, a high-efficiency high-power-density wide-bandgap-based CLLC resonant converter with low-stray-capacitance and well-heat-dissipated planar transformer is presented, which used as the isolated dc-dc stage for an electric vehicle on-board charger. A generalized design methodology proposed validated by practical designs experimental tests. novel simple configuration to reduce winding stray capacitance enhance thermal dissipation. The compared different designs, tradeoffs of...

Wide-bandgap devices, such as silicon carbide and gallium nitride, have high switching speed potential. However, the actual in practical application is limited by circuit parasitics interaction between high-side switch lowside a phase-leg configuration, known crosstalk effect. This article proposes an isolated voltage source gate driver with suppression capability to take full advantage of inherent ability silicon-carbide devices. By applying variable through auxiliary circuit, problem can...

This paper presents a high performance 4-layer communication architecture for smart micro-grid testbed which consists of 2 kVA Distributed Energy Resource (DER) inverter with PV and battery channels capable advanced grid supportive forming functions in the Process layer, Raspberry Pi computer Interface customized Edge Intelligent Device (EID) Sub-station an end-to-end solar energy optimization platform (e-SEOP) Supervisory layer. The serves as interface communicates DER using Serial...

Pulverized coal injection (PCI) is a vital operation of blast furnace, reducing coke consumption and carbon emission. The structure the oxygen-coal lance (OCL) significantly impacts PCI effectiveness. In this article, three-dimensional combustion model furnace established by numerical method. Results indicate that increasing OCL insertion depth decreases PC burnout, potentially tuyere nozzle abrasion. When angle tilts from +5° to −15°, temperature increases first then decreases. tilted...

The blast furnace tuyere, the key equipment of (BF) cooling system, endures a severe working environment and frequently lends itself to damage. Therefore, improving service life tuyere is very important for long-term stable operation furnace. This paper establishes three-dimensional BF double cavity model based on computational fluid dynamic method. First, temperature velocity distribution characteristics are simulated. Then, influence capacity investigated by changing front height, width,...

<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$LLC$ </tex-math></inline-formula> and notation="LaTeX">$CLLC$ resonant converters are good candidates for the isolated dc–dc stage in electric vehicle (EV) onboard chargers (OBCs) due to their capability of achieving zero-voltage-switching (ZVS) at full load range. The synchronous rectifier (SR) is usually utilized reduce conduction loss improve system...

SiC MOSFET has superior switching performance over Si IGBT in terms of power loss and temperature characteristics. In order to significantly improve the efficiency density medium-voltage drive high-power converters, this article proposes a current-source gate driver (CS-GD) for series-connected MOSFETs, forming universal block devices with higher voltage rating. The proposed CS-GD better synchronization because its constant current novel structure. By implementing synchronized voltages,...

The voltage rating of the commercial Gallium Nitride (GaN) power devices are limited to 600/650 V due lateral structure. Stacking low-voltage is a straightforward approach block higher dc link voltage. However, unbalanced sharing can occur discrepancies in gate driving loops, device parameter tolerance and device-to-ground displacement currents for series-connected stack. imbalance may cause over-voltage breakdown, particular GaN devices, which do not have avalanche breakdown mechanism. In...

A static model of blast furnace operation natural gas (NG) injection was developed. The effect NG on the raceway adiabatic flame temperature, amount and composition bosh gas, direct reduction degree fuel ratio were studied. results showed that under no thermal compensation, heat loss whole increases, which means surplus is sufficient. However, in high-temperature zone insufficient, showing characteristics “cold at bottom hot top”. Based comparison after with reference condition, if...

The goal of this paper is to solve the voltage and frequency fluctuation problem microgrid in standalone operation. proposed main idea use super capacitor prevent large during transient battery maintain long-term stability. control strategies for renewable energy sources, storage system, load power quality improvements devices three different operation modes "grid-connected", "standalone", "transient islanding reconnection" have been proposed. A sample system used verify effectiveness strategies.

The goal of this paper is to significantly improve the efficiency and power density medium voltage drive high-power converters. To achieve goal, proposed approach replace high Si IGBT by series connected SiC MOSFETs. Specifically, a game changing universally applicable standard block "series MOSFET" with excellent dynamic sharing reliability proposed. core technology in current source gate driver device synchronization function. A down-scaled prototype has been developed demonstrate...

For LLC/CLLC resonant converters, synchronous rectifiers (SR) are desired to be turned off at the current zerocrossing moment avoid additional conduction loss and circulation current. In this paper, an adaptive SR driving scheme is proposed for converter, which guarantees ZCS turn-off of SRs improves system efficiency. The method senses drain-to-source voltage only one switch, makes it easy implement. Meanwhile, a simple sensing circuit proposed. can directly interfaced with digital...

This paper proposes a generalized design methodology of robust controller to mitigate the impact system uncertainty on stability and performance which includes steady-state error, disturbance rejection, high-frequency noise attenuation speed dynamic response. The first step is select weighting functions that bound transfer for entire range uncertainty. second form mathematical representation both performance. third conduct H-infinity synthesis generate full-order controller, then carry out...

The objective of the concept T-type Modular Multilevel Converter (TMMC) is to improve power density traditional (MMC) exploited in medium voltage motor drive. size major volume contributor "capacitor" can be reduced by 30%~40% with proposed circuit operating at only half dc link low frequency region, which enabled an extra full bridge arm inserted between middle point and terminal output each phase leg. It also found a topology that optimized for usage SiC device because its zero requirement...

A 48 V Belt-Driven Starter Generator (BSG) System is featured with high output current, starting torque, and highly efficient thermal management. This paper firstly elaborates hardware design considerations of a power density three-phase BSG inverter to address the challenges even current distribution among paralleled MOSFETs, small drain-source voltage spike good dissipation. In order satisfy high-current requirement, careful selection MOSFET device rating low on-resistance has been...

In this study, a novel closed-loop current source gate driver is presented to address the unbalanced dynamic voltage sharing issue. Additional compensation actively injected into switch counteract imbalance brought by device-to-ground displacement currents. Compared with conventional driver-based active control method, proposed tunes turn-off timing and dv/dt more accurately, because directly regulated. Meanwhile, since both of pulse width amplitude can be adjusted, flexible for adapting...

Series connection of devices is an effective way to achieve higher blocking voltage. SiC MOSFETs exhibit narrow short-circuit withstand time and generally much lower robustness than silicon IGBTs. This puts a critical concern on their utilization, further stressing the importance reliable protection. A complete protection should be implemented improve reliability. In this article, systematic analysis methodology proposed. Following methodology, all possible fault scenarios can derived....

A standard pump-back system consisting of two Modular Multilevel Converters (MMCs) has been proposed. Compared with traditional two-level inverter based system, the MMC topology is able to produce a virtual grid multilevel voltage output. In addition, energy control loops are unique for ensure balance between its DC and AC side. The associating challenge retrieve moving average capacitor under variable frequency condition. basic operation principle strategies including all current have...

Distributed Generators (DGs) are required to be equipped with certain Anti-Islanding Protection (AIP) functions due safety concerns. This paper proposes a novel AIP method based on reactive power injection and Second Order Generalized Integrators (SOGIs). The is able identify islanding under the worst case which usually known as Non-Detection Zone (NDZ). shows better performance in system frequency/angle measurement compared traditional Phase Locked Loop (PLL) uses Double-SOGI topology for...

Interior Permanent Magnet (IPM) machines are advantageous over other kind for their wide-speed range operation by field-weakening technique. The proposed off-line calculation and curve fitting based IPM motor drive control strategy can achieve seamless transition between normal operations maintaining minimum winding current. detailed current reference generation algorithm using MATLAB toolbox is presented. diagrams with the implementation of also demonstrated in two cases which real...

Pulse power supply is an important field of high-frequency electronics. In advanced applications, such as ultrasonic sensors, Lidar waves, and laser generators, the voltage with high amplitude frequency required to achieve sufficient technical performance. Meanwhile, quality pursued in some sensor applications obtain better This article develops a ±1000-V/1.5-MHz LCC resonant pulse inverter for electromagnetic acoustic transducer. First, filter optimized goals low total harmonics distortion...