Voltage balance control of dc capacitors is the key problem multilevel diode-clamped converters (DCCs). In this paper, a novel hybrid voltage method proposed for five-level DCCs. First, to upper or lower two capacitors, flying-capacitor-based circuit (VBC) proposed, and time-domain average model VBC established. Then state-machine-based strategy developed capacitor voltages as well limit overcurrent inductors in transition process. To keep midpoint stable, zero-sequence injection which...

Voltage deviations of dc-link capacitors are the main problem multilevel diode-clamped converters (DCC). In this paper, a novel carrier-based voltage balance method is proposed to five-level DCCs. The characterized by injecting proper zero-sequence voltages in modulation signals modulators. effects injected on floating nodes mathematically analyzed. Hereby, closed-loop algorithm determine optimal voltages. Compared with existing space vector based methods, methods easier be implemented....

In high-power converters based on SiC-MOSFET half-bridge modules, laminated busbar plays a critical role in linking the DC capacitor bank to power modules. The stray capacitance has same order of magnitude with drain-source and great impact turn-off voltage oscillation SiC-MOSFET. this paper, parasitic elements three-layer are extracted model consideration is obtained. A spectrum analysis performed small-signal equivalent circuit double pulse test (DPT), lower frequency voltage. results...

Dual bridge series resonant DC/DC converter (DBSRC) usually works at continuous current mode (CCM), whose switching frequency is set higher than frequency. Thus, soft switch-on and switch-off of power switch cannot be realized simultaneously with no extra snubber circuit connected. And the primary measure to reduce losses devices. The commutations DBSRC in different conditions are analyzed this paper values derived from model. From view reducing current, gives a guideline select parameters...

In this paper, a novel current control strategy applied in linear synchronous motor (LSM) drive system is proposed based on resonant proportion (PR) controller. First, the characteristics of PR regulator analyzed detail, and theoretical model LSM stationary reference frame established. Then structure for given. It consists an outer PI speed loop inner loop. Compared with conventional controller, controller employed to build frame. Simulation results verify feasibility validity method.

The three-level neutral-point-clamped converter has been widely used in medium voltage range for industrial applications, however, the unbalance distribution of power loss three level NPC limit output power, active neutral point clamped (ANPC) provides more flow paths which can improve balance distribution. Fault diagnosis electronic converters is necessary to prevent further damage, open circuit switch fault every device ANPC analyzed this paper. concept based on instantaneous introduced....

Word embedding is one of the most popular representation a document vocabulary. It capable capturing context, semantic and syntactic similarity words in document. Word2vec well-known technique to learn word embeddings fixed dimensionality by using shallow neural networks, which can also be used transform audio segment each into vector. In this paper, deep network based on speech vector model proposed directly from segment, represent some information. Unlike previous methods, such as...

Voltage Balance of the series-connected dc-link capacitors is key problem three-level diode-clamped converters. In this paper, an auxiliary voltage balance circuit (VBC) presented to maintain capacitors. The consists a clamping capacitor and current-limiting inductor. With capacitor, stresses devices are restricted one half bus voltage, current ripple inductor also effectively suppressed. operating principles studied, time-domain model derived. Accordingly, control algorithm proposed based...

This paper proposes a high performance control method with Multi-CPU synchronous, time-delay and feedforward compensation for High-Speed Maglev. The proposed strategies are verified on Real-Time simulation platform Hardware-In-Loop. experimental results demonstrate that by using the methods high-speed maglev can be operated in whole speed range from 0 to 500km/h.

To enhance the strength of austenitic stainless steel (ASS) sheet components, a novel method was proposed for strengthening ASS domes by newly-designed bulging device under deep cryogenic conditions. The load curves, Vickers microhardness, thickness distribution and deformation law formed dome components at room temperature (RT) liquid nitrogen (LNT) were discussed in detail. mechanism elucidated microstructural phase transformation, evolutions grain boundary dislocation RT LNT,...

High-frequency transformers are a vital component of isolated DC/DC converters, and its leakage inductance can be adjusted by changing the winding method two-phase windings. Nanocrystalline magnetic cores have been widely applied due to their advantages in high-saturation flux high permeability. However, quite electrical conductivity easily lead appreciable eddy current loss. This paper investigates mechanism behind loss caused varying number windings cross turns, verifies through simulation...

The speed of variable diesel generator set changes with the load, and its operating conditions are different from those propulsion unit or constant set. In order to give full play fuel saving advantages set, this paper takes back-to-back three-level neutral-point-clamped (NPC) converter as research object, carries out on control strategy performance optimization so achieve best consumption control.