Frequency: Quarterly E- ISSN: 2277-6311 P- ISSN: Awaited Abstracted/ Indexed in: CNKI Scholar (China National Knowledge Infrastructure), Ulrichâ??s International Periodical Directory, Google Scholar, SCIRUS, Genamics JournalSeek
â??Inventi Rapid/Impact: Power Electronicsâ?? is having its focus on the applications and technologies in the field of power electronics. It invites original research papers, short communications and review articles in power electronics applications such as electric drives, medical and military apparatus, utility applications, transport and space applications, energy harvesting and storage management systems, and technologies like circuits, components and materials, controls etc. The scope does include environmental impact and education.
A low-power wideband mixer is designed and implemented in 0.13 ????m standard CMOS technology based on resistive feedback\ncurrent-reuse (RFCR) configuration for the application of cognitive radio receiver. The proposed RFCR architecture incorporates\nan inductive peaking technique to compensate for gain roll-off at high frequencywhile enhancing the bandwidth.Acomplementary\ncurrent-reuse technique is used between transconductance and IF stages to boost the conversion gain without additional power\nconsumption by reusing the DC bias current of the LO stage. This downconversion double-balanced mixer exhibits a high and\nflat conversion gain (CG) of 14.9 �± 1.4 dB and a noise figure (NF) better than 12.8 dB.The maximum input 1-dB compression point\n(P1dB) andmaximum input third-order intercept point (IIP3) are ?13.6 dBmand ?4.5 dBm, respectively, over the desired frequency\nranging from 50 MHz to 10GHz.The proposed circuit operates down to a supply headroom of 1V with a low-power consumption\nof 3.5 mW....
A unique direct driven permanent magnet synchronous generator has been designed and constructed. Results from simulations as well as from the first experimental tests are presented. The generator has been specifically designed to be directly driven by a vertical axis wind turbine and has an unusually low reactance. Generators for wind turbines with full variable speed should maintain a high efficiency for the whole operational regime. Furthermore, for this application, requirements are placed on high generator torque capability for the whole operational regime. These issues are elaborated in the paper and studied through simulations. It is shown that the generator fulfils the expectations. An electrical control can effectively substitute a mechanical pitch control. Furthermore, results from measurements of magnetic flux density in the airgap and no load voltage coincide with simulations. The electromagnetic simulations of the generator are performed by using an electromagnetic model solved in a finite element environment....
A unique direct driven permanent magnet synchronous generator has been designed and constructed. Results from simulations as\nwell as from the first experimental tests are presented. The generator has been specifically designed to be directly driven by a vertical\naxis wind turbine and has an unusually low reactance. Generators for wind turbines with full variable speed should maintain a\nhigh efficiency for the whole operational regime. Furthermore, for this application, requirements are placed on high generator\ntorque capability for the whole operational regime. These issues are elaborated in the paper and studied through simulations.\nIt is shown that the generator fulfils the expectations. An electrical control can effectively substitute a mechanical pitch control.\nFurthermore, results from measurements of magnetic flux density in the airgap and no load voltage coincide with simulations.\nThe electromagnetic simulations of the generator are performed by using an electromagnetic model solved in a finite element\nenvironment....
This work, based on the junction recombination velocity (Sfu) concept, is used to study the solar\ncell�s electric power at any real operating point. Using Sfu and the back side recombination velocity\n(Sbu) in a 3D modelling study, the continuity equation is resolved. We determined the photocurrent\ndensity, the photovoltage and the solar cell�s electric power which is a calibrated function of\nthe junction recombination velocity (Sfu). Plots of solar cell�s electric power with the junction recombination\nvelocity give the maximum solar cell�s electric power, Pm. Influence of various parameters\nsuch as grain size (g), grain boundaries recombination velocity (Sgb), wavelength ()\nand for different illumination modes on the solar cell�s electric power is studied....
In a low-voltage islanded microgrid powered by renewable energy sources, the energy storage systems (ESSs) are considered\nnecessary, in order to maintain the power balance. Since a microgrid can be composed of several distributed ESSs (DESSs), a\ncoordinated control of their state-of-charge (SoC) should be implemented, ensuring the prolonged lifespan. This paper proposes a\nnew decentralized control method for balancing the SoC of DESSs in islanded microgrids, without physical communication. Each\nDESS injects a current distortion at 175Hz, when its SoC changes by 10%. This distortion is recognized by every DESS, through\na phase-locked loop (PLL). In order to distinguish the origin of the distortion, each DESS injects a distortion of different time\nduration. This intermediate frequency has been selected in order to avoid the concurrence with the usual harmonics. The DESSs\ntake advantage of this information and inject a current proportional to the SoC. Implementing this strategy, a comparable number\nof charging/discharging cycles for each DESS are achieved. Furthermore, an active filter operation, implemented in the dq rotating\nframe for each individual harmonic, is integrated in the control of the distributed generation units, supplying nonlinear loads with\nhigh-quality voltage. The effectiveness of this method is verified by detailed simulation results...
The increasing penetration of renewable generators can be a significant challenge due to\nthe fluctuation of their power generation. Energy storage (ES) units are one solution to improve\npower supply quality and guarantee system stability. In this paper, a hybrid microgrid is built\nbased on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to\nachieve power management in a decentralized manner. This control scheme contains three different\ndroop strategies according to characteristics of PV and ES. First, the modified droop control is\nproposed for PV, which can take full utilization of renewable energy and avoid regulating output\nactive power frequently. Second, to maintain the direct current (DC) bus voltage stability, a novel\ndroop control incorporating a constant power band is presented for DC-side ES. Third, a cascade\ndroop control is designed for alternating current (AC)-side ES. Thus, the ES lifetime is prolonged.\nMoreover, interlinking converters (ICs) provide a bridge between AC/DC buses in a hybrid microgrid.\nThe power control of IC is enabled when the AC- or DC-side suffer from active power demand\nshortage. In particular, if the AC microgrid does not satisfy the reactive power demand, IC then acts\nas a static synchronous compensator (STATCOM). The effectiveness of the proposed strategies is\nverified by simulations....
This paper proposes a new technique and design methodology on a transformer-based Class-E\ncomplementarymetal-oxide-semiconductor (CMOS) power amplifier (PA)with only one transformer and\ntwo capacitors in the load network. An analysis of this amplifier is presented together with an accurate\nand simple design procedure. The experimental results are in good agreement with the theoretical\nanalysis. The following performance parameters are determined for optimum operation: The current\nand voltage waveform, the peak value of drain current and drain-to-source voltage, the output power,\nthe efficiency and the component values of the load network are determined to be essential for optimum\noperation. The measured drain efficiency (DE) and power-added efficiency (PAE) is over 70% with\n10-dBm output power at 2.4 GHz, using a 65 nm CMOS process technology....
Accurate current control of the voltage source converters (VSCs) is one of the key research subjects in modern power electronics. To achieve a preferable solution to current coupling effect in the VSC-based three-phase three-line system, a discrete-time decoupled current control strategy is proposed in the paper. With integration of the a-�Ÿ transform and two independent current controllers, the proposed methodology can effectively implement decoupled control of the three-phase currents, which can thereby eliminate the impact from the neutral-point voltage especially under asymmetrical loading conditions. Control performance under digital realization was characterized with extensive tests on a shunt active power filter (SAPF) platform. Both the simulative and experimental results have demonstrated that the SAPF could function well and thereby verified the feasibility and effectiveness of the proposed current control methodology....
Thecomplicatedmodulation algorithm and the high switching frequency are twomain hindrances in the analysis and simulation of\nmatrix converters (MCs) based systems. To simplify the analysis and accelerate the simulation ofMCs, a unique dynamic model is\npresented for theMC, which is independent ofMC type (direct or indirect) and the modulation algorithm. All the input and output\nvariables are transferred to the respective reference frames and their relations and limits are calculated. Based on the proposed\nequations, an equivalent circuit model is presented which can predict all the direct and indirect matrix converters dynamic and\nsteady state behaviors without the need for small simulation time steps.Validity of the proposed model is evaluated using simulation\nof the precise model. Moreover, experimental results from a laboratory matrix converter setup are provided to verify the accuracy\nof the simulation results....
The importance of energy-constrained processors continues to grow especially for\nultra-portable sensor-based platforms for the Internet-of-Things (IoT). Processors for these IoT\napplications primarily operate at near-threshold (NT) voltages and have multiple power modes.\nAchieving high conversion efficiency within the DCââ?¬â??DC converter that supplies these processors is\ncritical since energy consumption of the DCââ?¬â??DC/processor system is proportional to the DCââ?¬â??DC\nconverter efficiency. The DCââ?¬â??DC converter must maintain high efficiency over a large load range\ngenerated from the multiple power modes of the processor. This paper presents a fully integrated\nstep-down self-oscillating switched-capacitor DCââ?¬â??DC converter that is capable of meeting these\nchallenges. The area of the converter is 0.0104 mm2 and is designed in 28 nm ultra-thin body\nand buried oxide fully-depleted SOI (UTBB FD-SOI). Back-gate biasing within FD-SOI is utilized\nto increase the load power range of the converter. With an input of 1 V and output of 460 mV,\nmeasurements of the converter show a minimum efficiency of 75% for 79 nW to 200 Ã?¼W loads.\nMeasurements with an off-chip NT processor load show efficiency up to 86%. The converterââ?¬â?¢s large\nload power range and high efficiency make it an excellent fit for energy-constrained processors...
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