Although SiC-mosfet has significant advantages on switching performance over traditional Si-IGBT, the loss of devices at hard rises quickly with increment in frequency. This narrowed down further possibilities improving efficiency and power density grid inverter. Zero-voltage-switching (ZVS) space-vector-modulation (SVM) technique is introduced to push paper focuses impact applying ZVS-SVM three-phase two-level With same requirement SiC inverter can operate a much higher frequency, which...

This paper proposes a packaging method for SiC MOSFETs that provides feasible solution of implementing press-pack on to extend the application devices into high power range. The challenges in realizing are addressed, and solutions proposed fit specific requirements MOSFET. To achieve pressure contact MOSFETs, miniature flexible press pins called "fuzz buttons" used low-profile interposer realize die top side connection. Since does not provide internal insulation between active device...

Unbalanced grid voltage causes a large second-order harmonic current in the dc-link capacitors as well dc-voltage fluctuation, which potentially will degrade lifespan and reliability of source converters. This paper proposes novel dc-capacitor control method for grid-side converter (GSC) to eliminate negative impact unbalanced on dc-capacitors. In this method, loop, where negative-sequence resonant controller is used increase loop gain, added conventional GSC loop. The rejection capability...

We proposed a novel architecture for optical image encryption based on interference between two polarized wavefronts. A polarization-selective diffractive element is employed to generate the desired wavefronts by modulating incident light beam. The algorithm this new method simple and does not need iterative encoding. Numerical simulation performed demonstrate validity of method.

IGBT short-circuit protection is the key factor to improve reliability of power electronics system. The conventional method based on V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">CE</sub> measurement detects collector-emitter voltage an determine whether fault occurs. blanking circuit needed in this kind avoid false triggering during turn-on transient. However, should be carefully designed for different types modules. In order make suitable...

Monolithically integrated long-wavelength vertical-cavity surface-emitting laser arrays of 4, 8, and 12 high-speed devices are presented. These have a lithographically defined pitch 250 μm feature per-channel bandwidth 10 Gb/s over 20 km standard single-mode fiber. The output performance is very homogenous for the whole array. Emission wavelength addressable by current-tuning without any bit-error-rate penalty. This allows highly scalable metro-range networks. Through migration from coarse...

New grid codes demand the wind turbine systems to ride through recurring faults. In this paper, performance of doubly Ffed induction generator (DFIG) system under symmetrical faults is analyzed. The mathematical model DFIG established. analysis based on with typical low-voltage ride-through strategy—with rotor-side crowbar. stator natural flux produced by voltage recovery after first fault may be superposed second fault, so that transient rotor and current torque fluctuations influenced...

The wind turbine system (WTS) is required to ride-through recurring grid faults by the new codes. Under single faults, fault (FRT) strategy with rotor-side crowbar normally used for doubly-fed induction generator (DFIG) WTS. However, under larger transient current and voltage may be produced, DFIG fail second even crowbar. can active again during recovery, but large electromagnetic torque (EM-torque) fluctuations will introduced. reliability of mechanical influenced. In this paper, an FRT...

In a zero-voltage switching (ZVS) inverter, high conversion efficiency and miniaturization are expected since loss can be dramatically reduced with proper design. order to realize ZVS condition, auxiliary components such as inductors, capacitors, switches embedded in the inverter implement function. Since design of is critical it impossible maximum or minimum size by following conventional procedure. This paper introduces an optimized methodology for three-phase objectives both...

A versatile arbitrary bias control technology for Mach-Zehnder modulators (MZMs) based on a linear-frequency modulated (LFM) signal is proposed. An LFM applied to the direct current (DC) port of an MZM together with DC voltage. The output microwave measured and cross-correlated fundamental frequency-doubled components signal. Their ratio serves as feedback point. experiment carried out. Compared conventional single-frequency pilot-based technique, peak power component in electrical decreases...

In this paper, efficiency comparison of 2- and 3-level inverters based on a 50 kW grid-connected solar inverter is presented. A Inverter with combination SiC MOSFET Si IGBT proposed. An improved switching pattern employed to realize the zero-voltage (ZVS) operation for IGBTs. Therefore, optimal can be achieved by taking advantage both Si-IGBT MOSFET. It shows that utilizing hybrid switches in T-type achieve highest efficiency. 4 single phase built verify analysis.

We observe experimentally, the first time to our knowledge, two types of composite gap solitons in optically induced one-dimensional nonlinear lattice LiNbO(3) crystal. staggered bright soliton when a single Gauss probe beam is incident at Bragg angle as well dipole normal incidence. When incidence, in-phase are observed.

Green storage plays a key role in modern logistics and is committed to minimizing the environmental impact. To promote transformation of traditional green storage, research on capacity allocation wind-solar-storage microgrids for proposed. Firstly, this paper proposes microgrid configuration model, secondly takes shortest payback period as objective function, uses improved sparrow search algorithm (ISSA) optimization. Logistic-Tent compound chaotic mapping method added population...

Effects of lower order harmonic grid voltage on the stator current Doubly Fed Induction Generator (DFIG) are investigated. A control method for DFIG wind power system is presented to suppress effects current. The proposed scheme analyzed using transfer function. performance verified by both simulation and experiment a prototype.

A physics-based compact gallium nitride power semiconductor device model is presented in this work, which the first of its kind. The derivation based on classical drift-diffusion carrier transport, expresses channel current as a function threshold voltage and externally applied electric fields. implemented Saber <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">®</sup> circuit simulator using MAST hardware description language. allows user to...

We have observed experimentally, for the first time to our knowledge, one-dimensional photovoltaic dark spatial solitons in LiNbO3:Fe crystal by using incoherent white light. also fabricated a directional coupler consisting of two waveguides induced mutually white-light propagating parallel close proximity. It was found that light field probe laser beam launched into one proximate can be efficiently coupled other waveguide because presence evanescent waves. studied dependence coupling...