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Networked DC nano-grids are based on simultaneous power and data transfer between nodes of the power distribution networks. The node of a networked DC nano-grid can be realized using a multi-port power converter. The multiport power converter integrates several loads within a single unit. Hence, the number of power converters of a system can be minimized to reduce cost, complexity, and to improve...
Both magnetic field and electric field can be used for transferring power wirelessly. But the up-to-date researches on wireless power transfer have been either inductive power transfer (magnetic field) or capacitive power transfer (electric field). An improved power transfer mode called hybrid wireless power transfer (HWPT) is proposed and evaluated in this paper. Power is transferred from primary...
This paper proposes a power factor correction method of a non-resonant IPT system using a four-winding transformer. The proposed technique is applied to the IPT system with a dual active bridge converter to reduce conduction loss and winding loss. When two pairs of the primary-side and the secondary-side wires are connected in parallel, the low coupling coefficient between the wires driven by in-phase...
This paper introduces a large air-gap capacitive wireless power transfer (WPT) system for electric vehicle charging that achieves a power transfer density exceeding the state-of-the-art by more than a factor of four. This high power transfer density is achieved by operating at a high switching frequency (6.78 MHz), combined with an innovative approach to designing matching networks that enable effective...
This paper introduces the differential-mode circulating current (DMCC) and zero-sequence circulating current (ZSCC) reduction method for paralleled inverters with zero common-mode (CM) PWM algorithm. By analyzing the reason of current jump in phase-leg, the method based on the freedom of PWM signal exchange and active voltage vector sequence exchange can be adopted which can keep volt-seconds balance...
The increasing penetration of grid-connected RES systems, advanced control algorithms have been developed to operate under grid faults and fulfill strict requirements of the grid codes. In order to overcome this, the current controller performance is critical considering it as the inner control loop of any grid-connected RES system. Based on the resonant control concept, this paper presents a modified...
This paper presents a closed loop control design for the class-E2 WPT system with the pre- and post-regulation. In the proposed WPT system, the output voltage is regulated by changing the switch-on duty ratio of the post regulator, whose information is transmitted to the primary side by wireless communication. At the transmitter side, the input current is minimized by changing the switch-on duty ratio...
This paper discusses the operation of a new battery-integrated high-frequency-isolated PV inverter. The working principle of the circuit is similar to the triple-active-bridge converter, wherein power-flow at two of the three ports can be regulated by variation of phase-shifts between the three synthesized high-frequency ac voltages. ZVS operation of most devices and an electrolytic capacitor-free...
Distributed generation (DG) is connected through three-phase inverter to the microgrid. The virtual power based droop control can guarantee the pure decoupling between active and reactive power irrespective of low-voltage or high-voltage microgrid application if the line-impedance information is known in advance. However, unbalances are commonly existent in practice so that this conventional control...
Traditional half bridge dual buck inverter (DBI) has a low power density due to the employing of two large input capacitances and two discrete output inductors. Magnetic integration is an effective method to enhance power density. However, unexpected circulating current may be induced by adopting conventional magnetic integration scheme. This paper proposes a novel magnetic integrated DBI inverter,...
This paper introduces a very-high-power-transfer-density GaN-based capacitive wireless power transfer (WPT) system, suitable as one module of a multi-modular WPT system for charging of electric forklifts. This capacitive WPT system achieves very high power transfer density by operating at a high switching frequency (6.78 MHz) using a GaN-based inverter, and by utilizing innovatively designed L-section...
This article focuses on Inductive Power Transfer to implement dynamic charging for electric vehicles. The system proposed is composed of adjacent 50-cm-side square coils set on the road, with only the coil under the vehicle activated for power transfer. It relies on a symmetrical circuit coupled to a symmetrical control using ZPA regulation to operate frequency-varying inverters, using soft switching...
This paper proposes a simplified model predictive control (MPC) for open-winding permanent magnet synchronous motor (OW-PMSM) system with two isolated power sources. According to the relationship between the torque and flux in PMSM, the two control constraints, torque and flux, in conventional MPC are converted into an equivalent flux vector, which eliminates the weighting factor in the cost function...
It is well-known that the active switching of the DC-voltage inside the inverter is the dominant source of high frequency noise. In contrast, the impact of the diode rectifier is often believed to be small due to its low-frequency commutation without active switching. In this work we show that the diode rectifier has in fact a big impact on the noise propagation and therefore also on the EMC-filter...
The output active power and reactive power of new energy inverter can be controlled independently using vector control, but there are degrees of coupling between them under the influence of transmission line parameters. In this setting, an overall evaluation of the coupling degree of power is vital to achieve decoupling control. This paper indicates the root cause of inverter power coupling and necessity...
For a wireless power transfer system, when the transmission distance is long, the power is low in the case of low coupling coefficient. In order to solve this problem, a new compensate topology of primary side based on parallel T-type structure is proposed. The circuit structure and impedance characteristics of the system are analyzed, the compensation circuit can be used to make the primary side...
Static Random Access memory (SRAM) has a dense and regular layout structure with Bitlines (BL) and complementary Bitlines (BLN) running simultaneously along with power and ground lines. It can result in fabrication failures during wafer processing. Memory test algorithms read and write specific data in particular sequence so that maximum possible functional failures could be detected during testing...
A wireless power transmission device consists of a transmitting module and a receiving module. Unlike most wireless power transmission researches, this paper based on the research that adopts the 15-volt direct-current power as its auxiliary power, and inversion efficiency is also considered in relation to system transmission efficiency. The research made the best of Control IC SG3525 in inversion...
We present a dc-dc resonant converter structure that has a pair of loosely coupled inductors in place of one filter inductor and two resonant inductors. Not only the number of inductors is reduced by one, but in this arrangment the transformer provides galvanic isolation and requires a sub-unity coupling coefficient which eases the implementation, especially at high switching frequencies. Various...
In this paper, the performance characteristics of two coil and three coil structure for Wireless Power Transfer(WPT) systems are compared. The circuit model of both the systems are derived with the help of circuit theory. To obtain the high energy efficiency, the three coil structure is proposed. The analysis shows that this structure provides high efficiency for wider range of loads. The Simulation...
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