A novel naturally clamped zero-current commutated soft-switching bidirectional current-fed full-bridge isolated dc/dc converter is proposed. This proposed secondary-modulation technique clamps the voltage across primary-side devices with commutation, eliminating necessity for active-clamp circuit or passive snubbers. Switching losses are reduced significantly owing to switching of and zero-voltage secondary-side devices. Soft clamping inherent load independent. The independent duty cycle...

Renewable energy generations have been attracting sustained attentions in academic and industry. Current-fed-isolated-bidirectional dc/dc converters (CF-IBDCs) are widely adopted low-voltage high-current applications such as solar photovoltaic fuel cell with storage. This paper gives an overview a comprehensive comparative evaluation of CF-IBDCs. The active clamped, dual half-bridge, L-L type bridge, resonant-type, naturally other topologies CF-IBDCs investigated, analyzed, compared...

In this paper, the aggregation of electric vehicles (EVs) and fast charging station (FCS) is modeled as a leader-followers game to provide regulation reserves for power systems. The leader FCS operator, who manages local sources sets energy/reserve prices EVs increase its revenue, with consideration uncertain renewable called by independent system operator. On other hand, act followers obtain tradeoff between benefits from energy consumption provision, deciding their reserve strategies....

To realize high efficient energy conversion among multiple carriers in market environment, the hybrid ac/dc microgrid is embedded as electrical hub for hubs (EHs), and a stochastic day-ahead bidding strategy proposed operators (EHOs). The electricity, heating, cooling are managed to balance operational cost thermal service quality, while participating into realtime market. uncertainties of prices, loads, ambient temperature depicted by scenario trees, two-stage optimization scheme minimize...

This paper proposes a decentralized power management strategy for hybrid energy storage systems to achieve transient sharing and state-of-charge (SoC) recovery simultaneously. A virtual capacitance droop control with an autonomous SoC loop is proposed (ES) fast dynamic response, the conventional resistance method employed regulate ES slow response. The battery/supercapacitor (SC) system taken as application example. With method, load autonomously split into high-frequency low-frequency parts...

High voltage gain DC-DC converter is a prime requirement for renewable applications, in particular PV. Though numerous available increasing the gain, passive elements higher which reduces compactness, consequently, increases cost of system. To address this issue, high reported recently. However, number quite size. reduce and maintain same semiconductor devices, paper, new switched inductor arrangement proposed named as double switch (SL-DS-DC). Moreover, has compared to recently converter....

For several reasons, particularly due to the mismatch in feeder impedance, accurate power sharing islanded microgrids is a challenging task. To get around this problem, distributed event-triggered control strategy proposed article. The suggested technique adaptively regulates virtual impedances at both fundamental positive/negative sequence and harmonic frequencies and, therefore, accurately share reactive, unbalanced, harmonics powers among generation units. method requires no information...

The proposed converter has the following features: 1) zero-current commutation (ZCC) and natural voltage clamping (NVC) eliminate need for active-clamp circuits or passive snubbers required to absorb surge in conventional current-fed topologies. 2) Switching losses are reduced significantly owing switching of primary-side devices zero-voltage secondary-side devices. Turn-on transition loss primary is also negligible. 3) Soft NVC inherent load independent. 4) across device independent duty...

This paper presents a novel interleaved soft-switching bidirectional snubberless current-fed full-bridge voltage doubler (dc/dc converter) for an energy storage system in fuel cell electric vehicles. A secondary modulation technique is also proposed to clamp the across primary-side switches naturally with zero-current commutation. It, therefore, eliminates necessity external active-clamped circuit or passive snubbers absorb switch turn-off spike, major challenge converters. Zero-current...

This article proposes a new bidirectional isolated LLC resonant converter, which is suitable for ultra-wide voltage gain range applications, such as electric vehicle charging systems. The inverter and rectifier of proposed topology both have two modes by reconfiguring different modulation schemes during operation. results in three voltage-gain ranges, allowing ultrawide output operation over narrow frequency. conversion ratio tank can be designed only quarter the required range. Finally,...

Photovoltaic (PV) residential power system is an important application of renewable energy. The parallel-connected configuration PV modules rather than the series-connected become popular considering safety requirements and making full use generated for generation system. In this paper, a novel soft-switching current-fed push-pull front-end converter-based inverter proposed. Push-pull converter has only two primary devices with common ground to supply results in simple reduced gating...

Efficient power conversion technologies are strategic to the advancement of fuel cell vehicles (FCVs). This paper presents an overview conditioning system (PCS) architectures for FCV propulsion system. Two new topologies obtain variable ac from proposed. The switching devices based on proposed hybrid modulation technique that minimizes losses in inverter. converters do not use dc-link filter capacitors. Elimination capacitor only reduces size and volume but also helps retaining sine wave...

A compact high step up dc-dc converter with continuous input current and lower device voltage stress is a prime requirement for renewable application. In this article, gain proposed, which combines the concept of switched inductor capacitor along unique interconnection input-output. This arrangement reduces stress. The proposed has reduced conduction losses, components count, low across devices. Besides, ripple, suitable integration. operation steady-state analysis are done in mode. For...

Similar to the conventional three-phase parallel-connected MMC (PC-MMC), series-connected (SC-MMC) is a strong potential solution for high-voltage direct current (HVDC) applications. The study of SC-MMC focuses on control strategy, neglecting its small-signal dynamics, not mention stability when interacting with AC grid. Work modeling limited configurations. differs from PC-MMC in structure and harmonic content; hence, it necessary establish an accurate model according own characteristics....

A novel bidirectional snubberless naturally clamped soft-switching three-phase current-fed dc/dc converter is proposed. proposed secondary modulation technique clamps the voltage across primary-side devices with zero-current commutation, eliminating necessity for active-clamping circuits or passive snubbers and solving traditional problem of device turn-off spike. Switching losses are reduced significantly, owing to switching zero-voltage (ZVS) secondary-side devices. Soft natural clamping...

This paper presents a soft-switching current-fed full-bridge front-end-converter-based bidirectional inverter for residential photovoltaic (PV) applications. The proposed converter is an intrinsic isolated boost with high-step-up voltage conversion ratio. device naturally clamped owing to secondary modulation. Zero-current commutation of devices novel and makes the snubberless fully soft-switched natural clamping devices' voltage. switching primary zero-voltage are achieved. Soft inherent...

This paper proposes a sensorless speed-control method based on an innovative adaptive synchronous-frequency tracking-mode observer (AFTO) for surface permanent-magnet synchronous motor drives. The uses the AFTO function, proportional resonance control, to track stator currents adaptively under variable-frequency scenarios. Then, orthogonal phase-locked loop supports estimation of rotor speed. convergence stator-current errors guarantees back electromotive force (back EMF) without influence...

The essential features of a DC-DC converter for fuel cell vehicle are to ensure the higher voltage gain meet out DC link demand, continuous input current improve life span cell, presence common grounding avoid electromagnetic interference issue and lower stress with reduced components. This paper presents high by combining switched capacitor quasi boost network modules. proposed provides current, stress, utilizes fewer number elements feature. operating characteristics, steady-state analysis...

Bidirectional DC-DC converters are critical aspects of integrating energy storage units with hybrid electric vehicle. In this brief, a new bidirectional converter is presented based on the quasi Z-source and switched capacitor network. The proposed can achieve higher voltage gain in lower duty cycle as compared to existing reported literature. achieves high low range thus avoids inductor core saturation problem converters. addition, exhibits stress across capacitors. operation, steady-state...

This paper proposes a new design with magnetizing inductance to achieve extended range soft switching of current-sharing three-phase ac-link active-clamped zero-voltage (ZVS) current-fed dc/dc converter for low-voltage dc sources, i.e., battery, fuel cells, etc. The explains steady-state operation and presents analysis including effect. proposed maintains ZVS all power semiconductor devices over wide load source voltage. Current sharing results in reduced peak currents conduction losses....

This paper presents a comparison of two potential soft-switching bi-directional high-frequency transformer isolated voltage-fed and current-fed dual active bridge dc/dc converters for fuel cell vehicle application. The discussion are conducted over the suitability these acting as front-end converter inverter from perspective circulating peak currents, RMS currents through devices, components' ratings, size, losses, efficiency. Software package PSIM 9.0.4 has been utilized to justify merits...

This paper presents a novel six-pulse low-frequency (LF) fluctuating high-voltage dc-bus-based power system architecture for fuel cell vehicles (FCVs) application. A hybrid modulation scheme consisting of at LF scale and modified secondary 33% pulse width high-frequency (HF) is proposed. Three-phase ac waveforms the propulsion FCVs are generated from dc bus. The proposed technique significantly reduces switching losses bidirectional dual-stage inverter: 1) soft-switching both sides front-end...