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This paper investigates a switching operation when a current source gate drive circuit with energy cycling is used. The current source gate drive circuit consists of a voltage source, an input inductor and switching devices as an H-bridge inverter. The power consumption of the current source gate drive circuit is reduced to compared with that of a conventional voltage source gate drive circuit because...
This paper presents a novel model predictive current control method for induction machine with constant switching frequency. Using model predictive current control, a cost function considering error between the reference current and the predicted current is designed. A numerical method of quasi-continuous reference voltage calculation based on dichotomy is applied to generate the optimized reference...
The paper describes the design of a single-sided linear induction motor (SLIM) intended for an Articulated Funiculator (AF). A procedure is proposed where first an analytical design is carried out to obtain a preliminary geometry. The analytical design is based on approximate equivalent circuits under constrained conditions. In the second step a two-dimensional finite element method (2D-FEM) analysis...
Mechanical resonance suppression and disturbance rejection are important research contents of steel rolling mill, machine tools and other transmission mechanism. At present, there are many researches on mechanical resonance suppression or disturbance rejection, but most of them are in the single side. Few papers study the resonance suppression and disturbance rejection simultaneously, not to mention...
A novel high-voltage (HV) thick layer silicon-on-insulator (SOI) field p-channel lateral double-diffused metal-oxide semiconductor (pLDMOS) with single trench isolation is developed for HV switching IC based on 11-µm-thick silicon layer and 1-µm-thick buried oxide layer. The thick gate oxide layer is formed by field oxide process to endure the high voltage between the source and gate electrodes. The...
Grid connected converters with the LCL filters suffer from the instability problems when they are connected to grid with non-negligible impedance. The active damper is an effective tool for improving the stability of the grid connected converters against the various grid conditions. The operation principle of the active damper in previous study is mimicking a damping resistance at the resonance frequencies,...
This paper proposes a Direct Power Control (DPC) with ramping rate criterion of complex power in grid adaptive 5MW Permanent Magnet Synchronous Generator (PMSG) Medium Voltage (MV) Wind Turbines (WT). Benchmarking against the conventional control method is performed based on a neutral point clamped three-level back-to-back type voltage source converter. The ramping rate criterion of complex power...
Compared with AC collection system, DC collection system can reduce line losses and improve the efficiency of new energy. In order to facilitate distributed renewable access to DC-Bus, a variable coefficient droop control strategy is presented in this paper. Compared with conventional droop control strategy, variable coefficient droop control strategy can change the ratio of energy storage unit power...
As the deregulation of electricity market, in addition to grid-connected generators, any other resources capable of providing ancillary service are permitted to participate in the ancillary service market. Energy storage system is of great value due to its quick and accurate response. Regulation service plays an important role in real-time balance. A novel regulation market bidding model is proposed...
The Lithium iron phosphate (LiFePO4) batteries are widely used as power source for electric vehicles. By reason of safety issues, it is significant to estimate the state of charge (SOC) of a battery precisely. On the basis of the characteristics of LiFePO4 battery, the improved Thevenin equivalent circuit model is proposed, and the model parameters are identified by experimental testing. Additionally,...
This paper presents an energy-efficient output stage for neural simulators which generate needed bi-phasic pulses. Energy efficiency is improved by adopting a single-ended primary inductance converter (SEPIC) that has a wide range of output voltage varying with the stimulus current on tissue load for adaptive voltage scaling. Comparing with a typical current-controlled stimulator which has a fixed...
In this paper, a high efficiency Wireless Power Transfer (WPT) system for the on-board charger of Electric Vehicle (EV) is proposed and implemented. The analysis of the proposed system based on the Thevenin equivalent circuit model to come up with a suitable design for the battery charge application is presented. The proposed Wireless Power Transfer method has adopted four-coil system with air core...
This paper designs and implements a contactless maglev rotating power transfer system with new rotary inductive coupled structure for the testing equipment on shaft of high-speed rotation applications. The magnetic FEM software is used to analyze the power transfer characteristics of the structure with magnetic poles. This paper extends the magnetic material of the structure to improve the coupling...
A circular winding brushless DC (CWBLDC) motor is essentially a trapezoidal-EMF multiphase permanent magnet machine with the associated commutation circuit. It can achieve the same level of torque ripple performance as PMSMs, yet boast much higher torque density since the iron core is more fully utilized with trapezoidal EMFs. Field-circuit co-simulation is an effective and accurate tool in studying...
This study investigates an economic and highly efficient power-converter topology and its modulation scheme for 60 kW rapid EV charger system. The target system is a three-phase three-switch buck-type rectifier topology. A new carrier-based PWM scheme, which is characterized by simple implementation using logic gates, is introduced in this paper. This PWM scheme replaces the diode rectifier equivalent...
This paper proposes a soft-switching DC-AC H7 current source inverter (CSI) with an auxiliary circuitry on DC side and a traditional H6 inverter bridge, which utilizes CSI boost characteristic and combines the unique advantage of shunt-connected switch in H7 CSI. With the presented shoot-through modulation strategy, the H7 CSI front-end switch is able to work at zero voltage transition (ZVT) mode,...
With the development of all-electric aircrafts, variable frequency avionics system, of which the frequency ranges from 360Hz to 800Hz, has been taking the attention of researchers and aircraft manufactures. RNSIC and ATRU are two high power factor rectifiers based on passive network, of which the application properties in VF avionics system are researched in this paper. Based on the parameter design...
In this paper, a new control strategy—fixed freewheeling-time (FFT) control technique for DC-DC converter with fast transient response and high efficiency are studied. The operation of FFT control technique is described. The small signal model of FFT controlled buck converter operating in pseudo-continuous conduction mode (PCCM) is derived, with frequency-domain analysis of the closed-loop control-to-output,...
In order to overcome the power quality problems in AC electrical railway networks, the Railway Power Quality Compensator system (RPQC) is proposed and used effectively in a Traction Substation (TSS). The power rating of RPQC installed in every TSS is considerably large. In this paper, a RPQC capacity is studied and a compensation strategy with the aim of reducing installed capacity of RPQC is proposed...
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