Second-order generalized integrator (SOGI) based phase-locked loops (PLLs) are widely used for grid synchronization in single-phase grid-connected power converters. Previously, the estimated frequency of PLL stage is fed back to front-end SOGI block make SOGI-PLLs frequency-adaptive, which increases implementation complexity, and makes tuning sensitive, thus reducing stability margins. Alternatively, a frequency-fixed SOGI-based (briefly called FFSOGI-PLL) proposed ensure simple this letter....

Input-series-output-parallel dc-dc converters are suited for high-input voltage and low output applications. This letter presents a decentralized inverse-droop control this configuration. Each module is self-contained no central controller needed; thus, improving the system modularity, reliability, flexibility. With proposed control, reference rises as load becomes heavy. Even though input voltages not used in loop, power sharing including current can still be well achieved. Besides,...

This paper proposes a voltage match (VM) control for hybrid-bridge-based dual active bridge (DAB) converter in wide conversion gain applications. With the addition of an auxiliary half-bridge circuit, topology becomes integration and full-bridge DAB converter. Unlike other pulse width modulation generation method converters, this utilizes four-level at one port transformer to obtain matched waveforms within range twice minimum gain. Wide gain, decoupling two power variables zero-voltage...

This paper proposes a modeling and analysis method for Caputo–Fabrizio (C-F) definition-based fractional-order Boost converter with inductive loads. The proposed analyzes the system characteristics of circuit three state variables. Firstly, this constructs large signal model by taking advantage space averaging method, providing accurate analytical solutions quiescent operating point ripple parameters Secondly, small C-F linearization, transfer function Finally, conducts circuit-oriented...

The input-series-output-parallel (ISOP) connection, consisting of multiple modular dc/dc converters connected in series at the input and parallel output, is a good alternative to be used under high-voltage applications with low-voltage-rating switches. A novel output-current-sharing scheme, one output-voltage loop individual output-currents loops, proposed this paper. provides common reference for all current loops which feedback an converter not its own, but sum remaining output currents....

Input-series-output-series (ISOS) connected dc-dc converters enable low voltage rating switches to be used in high input and output applications needing electrical isolation. In order for ISOS two phase-shifted-full-bridge (PS-FB) achieve sharing (IVS) (OVS), duty cycle exchanging control is implemented by their cycles. Based on small-signal analysis, the stability mechanism of full-bridge with independent OVS revealed using Routh-Hurwitz criterion. Loop gain design also accomplished...

A control strategy is proposed for the dual-transformer-based dual-active-bridge converter to achieve wide zero-voltage switching (ZVS) range voltage conversion gain application. The phase-shift adopted with minimum power switches employing half bridge output, and a law ZVS reduce current-related loss. With method, four of can full ZVS. other two full-range under positive flow, while slightly reduced region reverse flow. Unlike methods three degrees freedom, method only utilizes decoupled...

Input-series-output-series (ISOS) connected dc-dc converters enable the utilization of low-voltage rating switches in high-voltage-input and high-voltage-output applications that require galvanic isolation. To achieve input or output power balance among all constituent modules, a general control strategy eliminating use input-voltage sharing (IVS) loops is proposed. The instability mechanism independent output-voltage has been investigated by using Routh-Hurwitz criterion. From same...

The unified boundary trapezoidal modulation (TZM) control utilizing fixed duty cycle compensation and magnetizing current design for dual active bridge dc-dc converter is proposed in this paper. are first introduced to achieve the zero voltage switching (ZVS) of power switches, which cannot be ensured with conventional TZM control. As a result, all switches can ZVS four turned off very low current. Besides, based on revealed transfer characteristic, variables including cycles phase-shift...

This letter proposes an input-series-output-parallel derived dc-dc converter composed of two phase-shift full-bridge (PSFB) converters and auxiliary LC networks. Each network is connected between the leading-leg midpoint a module lagging-leg other one. For conventional PSFB converters, switches may lose zero-voltage switching (ZVS) conditions at light loads. In proposed converter, ZVS for can be achieved with aid networks even The efficiency load improved. Therefore, suitable wide range....

In this paper, a variable switching frequency space vector pulsewidth modulation control is proposed. It used to achieve zero voltage (ZVS) for three-phase grid-connected source inverter with unity power factor. A wide range of ZVS can be realized without any additional sensors, auxiliary circuits, or current crossing detection circuits. The easily calculated by digital controller. variation in line cycle only about 1.5 times at specific load. An LCL filter attenuate the high ripples side,...

In this paper, a multistage nonisolated high voltage conversion ratio (VCR) bidirectional dc-dc converter is proposed. The VCR n times of the conventional buck/boost using only n+ 2 switches. All switches can achieve full-range zero switching (ZVS) despite power flow direction. operating principle, ZVS condition, and design considerations four-stage topology are analyzed in detail. addition, an improved dynamic frequency modulation proposed to reduce loss. Analyses comparisons between...

Series DC arc fault can cause fire hazards in the photovoltaic(PV) array. This paper proposes a time and time-frequency domain analysis method combining loop current PV-side voltage for detecting series fault. The fusion of two different signals enhance anti-interference ability algorithm. In analysis, conductance is put forward to represent circuit states. comparison with some common feature characteristics including voltage, changes are more obvious when occurs. Variational Mode...

This study employs the Caputo-Fabrizio fractional derivative to determine model of fractional-order RC circuits with arbitrary voltage input which can be widely used in a variety electrical systems. Analog circuit implementation defined by is presented and verified comparing proposed this work. For purpose judging whether practical, comparison experiments are carried out. By using Laplace transform, analytical solutions based on derivatives constant periodic sources deduced. Fractional-order...

Inductive power transfer employing high quality factor (high-Q) resonators is an effective method to extend the range of wireless system. However, overenhanced loading effect on transmitter side exacerbates degradation capability and phenomenon frequency splitting at a short coupling distance. Currently, adaptation techniques compensate maximize cost efficiency, which leads plateau efficiency bound 50% for voltage-fed inductive (IPT) In this paper, switch-mode operation proposed improve...

The power quality of three-phase grid-connected inverters has drawn attention with the increasing numbers distributed generation systems. In order to effectively eliminate harmonics in output currents, a hybrid system based on proportional–integral (PI) control and repetitive (RC) implemented synchronous reference frame (SRF) is presented. Based transformation, use controller not for achieving fundamental current tracking but attaining compensation, which different from RC designed static...