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"Inventi Impact: Power Electronics" 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 Ã?Â± 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....
The generation of 1/f noise is closely related to the quality defects of IGBT devices. In the
process of detecting single-tube noise of IGBT, thermal noise and shot noise show obvious white
noise characteristics in the low-frequency range. This paper investigates how to accurately detect the
1/f noise under strong white noise, and thus proposes a particle swarm optimization method known
as variational mode decomposition. First, the particle swarm optimization algorithm was used twice
to search the optimal parameter combination between the penalty parameter and the decomposition
modulus of the VMD model. Then, the parameters of the variational mode decomposition algorithm
were set in optimal parameter combination. The frequency center and bandwidth of each IMF
component were determined by continuous iteration in the variational framework. Finally, the 1/f
noise signal was adaptively separated from background noise. Extensive experimental investigations
carried out under different signal-to-noise ratios, compared with the optimal wavelet denoising
algorithm, revealed that the PSO-VMD algorithm improved the signal-to-noise ratio by 6.6%, 16.82%,
and 42.48%, whereas the mean square error is reduced by 7.12%, 19.80%, and 33.76%....
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\ncellÃ¢â?¬â?¢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 cellÃ¢â?¬â?¢s electric power which is a calibrated function of\nthe junction recombination velocity (Sfu). Plots of solar cellÃ¢â?¬â?¢s electric power with the junction recombination\nvelocity give the maximum solar cellÃ¢â?¬â?¢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 cellÃ¢â?¬â?¢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....
Grid-connected inverters are an important part of the connection between distributed
power generation units and the large grid, and their stability is the basis for ensuring the safe
operation of distributed power generation units. This study found that there is an inherent digital
control delay in the three-phase LCL grid-connected inverter system. This characteristic causes the
effective range of capacitive current feedback active damping to be reduced, the selection range of
the active damping coefficient to be limited, and the phase at the open-loop cutoff frequency to be
reduced. In order to reduce the impact of digital delay, this article conducts a detailed analysis of the
characteristics of the first-order lead link that can be used as delay compensation, pointing out that its
infinite gain when it obtains the optimal compensation effect will bring noise to the inverter system.
This paper proposes a method of cascading digital filters for the first-order leading link to suppress its
infinite gain. An improved delay compensation link that is more suitable for numerically controlled
inverter systems is constructed. Finally, the effectiveness and necessity of the proposed improved
delay compensation link are verified by a simulation platform and an experimental platform....
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-Ã?Å¸ 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....
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