With wide-spread application of power electronic converters in high systems, there has been a growing interest system reliability analysis and fault-tolerant capabilities. This paper presents comprehensive review conventional techniques regarding case semiconductor device failures. These can be classified into four categories based on the type hardware redundancy unit: switch-level, leg-level, module-level, system-level. Also, various methods are assessed according to cost, complexity,...

A novel current control strategy based on a new feedback for grid-connected voltage source inverters with an LCL-filter is proposed in this paper. By splitting the capacitor of into two parts, each proportional division capacitance, flowing between these parts measured and used as to regulator stabilize improve system performances. Consequently, V-1 transfer function inverter degraded from third-order first-order one, therefore closed-loop can be optimized easily minimum steady-state error...

A pulse-width modulation (PWM) plus phase-shift control bidirectional dc-dc converter is proposed. In this converter, PWM and are combined to reduce current stress conduction losses, expand ZVS range. The operation principle analysis of the explained, condition derived. prototype built verify analysis.

Parallel multi-inverter systems can be designed to have the advantages of expandable output power, improved reliability, and easy N+X redundancy operation. However, a current-sharing control scheme has employed enable inverters share load current equally. A system with instantaneous average-current-sharing is presented in this paper. By introducing disturbance source represent all sources that may cause unbalances, model built. Some key issues are discussed based on model, including...

Voltage harmonics in the grid can introduce stator current a doubly fed induction generator (DFIG) wind turbine system, which may potentially impact generated power quality. Therefore, controllers need to be designed eliminate of voltage harmonics, especially low-order harmonics. This paper proposes harmonic suppression method using sixth-order resonant controller negative sequence fifth- and positive seventh-order A control loop is added conventional rotor for suppression. The overall...

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...

An islanding detection method for a grid-connected inverter incorporating intermittent bilateral (IB) reactive power variation (RPV) is described. The output with IB enables the of an islanding. RPV range derived in order to eliminate nondetection zone. design scheme time obtained by estimating transient response due occurrence. In addition, effect proposed strategy on quality investigated. has been experimentally verified three-phase 6-kW inverter.

Due to the long cold start time and slow dynamics of proton exchange membrane (PEM) fuel cell (FC) stack, operating modes transfer control strategy for uninterruptible power supply (FC-UPS) is different from traditional (UPS) system. In this paper, a seamless strategy, which suitable FC-UPS, proposed. The conversion architecture FC-UPS presented with characteristic analysis PEMFC requirements UPS. Then, scheme investigated. proposed not only capable guaranteeing load voltage, but also...

A novel control method, named weighted average current (WACC), is proposed for damping of a three-phase grid inverter with an LCL filter. In this the sum partial and used as feedback loop. By using WACC, can be well decoupled under synchronous rotating frame. Furthermore, system transfer function reduced from third-order to first-order system. Consequently, loop gain bandwidth increased, which improve rejection capability background voltage harmonics. The performance also analyzed in case...

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...

A zero-voltage switching (ZVS) grid-connected full-bridge inverter and its modulation schemes are investigated. novel sinusoidal pulse width scheme for the ZVS (ZVS SPWM) is proposed in this paper. The SPWM evolved from double-frequency by adding gate drive to auxiliary switch. condition analyzed circulation loss of resonant branch optimized adjusting energy storage inductor. reverse recovery body-diode MOSFET relieved realized both main switches. filter inductors significantly reduced with...

Photovoltaic (PV) inverters without the isolation transformer become more attractive due to higher efficiency and lower weight. However, it may have dc offset current problem is critical power system. In this paper, a novel control strategy of suppressing injection grid for PV investigated. It based on idea accurately sensing voltage inverter output. Since component output can be eliminated, effectively suppressed. Finally, scheme verified by experiment.

Inductive power transfer (IPT) technology is useful for electric vehicle (EV) charging because of safe, flexible, and convenient features. In this paper, an integrated IPT system design employing variable inductor control proposed to achieve a target constant current (CC) voltage (CV) battery profile with misalignment tolerance. The implemented under fixed switching frequency in both CC CV modes. Soft the primary inverter can be achieved over entire process allowed range without additional...

Integrated electromagnetic interference (EMI) filter design method with flexible multilayer (FML) foils is presented. An analysis model for integrated EMI FML foils, distributed component (DEMC) model, proposed. The DEMC verified by the experiment. In addition, to improve high-frequency performance of investigated. Prototype made 1 kW switching power supply. comparison traditional discrete filter, it can reduce total volume 45%.

A six-switch three-phase inverter is widely used in a high-power grid-connected system. However, the antiparallel diodes topology operate hard-switching state under traditional control method causing severe switch loss and high electromagnetic interference problems. In order to solve problem, this paper proposes of but with an additional gave new space vector modulation (SVM) scheme. way, can realize zero-voltage switching (ZVS) operation all devices suppress reverse recovery current very...

In this paper, a novel intermittent reactive-power-variation (RPV) method based on loads' resonance frequency detection is proposed to reduce the injected reactive power. The RPV detects of point common coupling (PCC) and outputs minimum variation, which perturbs PCC thresholds decided by utility standards when islanding condition happens. Furthermore, detecting control strategy under unbalanced loads discussed. Compared with traditional bilateral method, only output unilateral in each...

In order to increase the power density of factor correction converter, a novel integrated structure for both electromagnetic interference (EMI) filter and boost inductor is proposed with flexible multilayer foil integration technique, which can reduce volume these passive components. Also, performance investigated based on distributed component model. Furthermore, design procedure detailed. Finally, prototype EMI has been built experiments demonstrate validity structure.

This paper investigates a novel pulse width modulation (PWM) scheme for two-phase interleaved boost converter with voltage multiplier fuel cell power system by combining alternating phase shift (APS) control and traditional interleaving PWM control. The APS is used to reduce the stress on switches in light load while keep better performance heavy load. boundary condition swapping between derived. Based aforementioned analysis, full range proposed. Loss breakdown analysis also given explore...

For three-phase AC-DC power conversion, the widely-used continuous current mode (CCM) modulation scheme results in relatively high semiconductor losses from hard-switching each device during half of mains cycle. Triangular (TCM) modulation, where inductor reverses polarity before turn-off, achieves zero-voltage-switching (ZVS) but at expense a wide switching frequency variation (15× for design considered here), complicating filter and compliance with EMI regulations. In this paper, we...

Adopting high-power wireless charging systems, particularly for heavy-duty electric vehicles (EVs) and fast of regular EVs, becomes extremely imperative. The stringent requirements safety guidelines, high efficiency, density would continue to impede the rapid penetrations power transfer (WPT) systems EVs at power. This article investigates potentials multichannel WPT achieve transmission under such requirements. A system consists multiple power-transfer paths that adjusting number channels...

The authors previously proposed a new MPPT (maximum power point tracking) control scheme for PV (photovoltaic) systems connected in parallel with the AC system line. It is characterised by utilizing balance at DC link under steady state conditions, hence eliminating array output detection and achieving sensorless operation. However, response stability greatly depend on its main circuit parameters. This paper shows design to ensure based transfer functions. Response of experimental has been...

48 V to 0.9 VRM using LLC resonant converter is presented. ZVS realized for switches and the can operate at higher frequency. How reduce primary current amplitude by reducing power factor angle explored. The effect of secondary leakage inductance studied FEA method used find optimal transformer winding con figuration. inductor be integrated with inductance, which reduces total magnetic component counts. A prototype V/50 built verify result.

A design of IMHz-1kW LLC resonant converter is presented. The loss analysis based on theoretical derivation performed to reveal the distribution. Integrated magnetic structure adopted in further increase power density. 1MHz 300V-400V input, 48V/20A output prototype built verify its advantage, and efficiency at 400V 94% switching frequency 875 KHz.