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An ac voltage regulating system of doubly Salient Electro-magnetic Generator has been performed in this paper. In order to maintain the high voltage 360VDC stable, the dual boost converter with fixed frequency PWM controlled is adopted. Three-phase dual buck inverter was adopted to output 115VAC/400Hz. the generating system configuration, control strategy of dual boost converter and three-phase dual...
Abstract-Due to nonlinear electromagnetic characteristics of Switched Reluctance Motor (SRM), as well as complexity of voltage and current waveforms, it is of great difficulty to control SRM optimally and compute power losses. A novel optimal control strategy of Non-Energy Returnable Current Chop (NERCC) was proposed, which is suitable for high power SRM drive. This method can obtain current waveform...
In power system, the voltage pulsation and deficiency or surplus of reactive power will have a great effect on the quality of electric power supply. Dynamicly local reactive power compensation is one of the best methods to reduce the power network loss and improve the efficiency of transmission and distribution. Through the effective methods of compensation, we can keep the balance of reactive power...
In this paper, a new scheme for three-level voltage space vector generation is proposed. In this work, the three-level inverter topology is realized by feeding an open winding induction motor with two two-level inverters, fed from a single dc source having the magnitude half compared to the NPC three-level inverter. Compared to existing three-level inverter topologies for open-end winding induction...
A standard design process for a novel switched reluctance planar motor (SRPM) is developed in this paper. The paper contains the illustration of the proposed design process for a 500times500 mm prototype. An analysis process is developed with a magnetic model and results from it are verified with finite element analysis (FEA) prior to construction of the prototype. Extensive simulation experimental...
This paper mainly discusses several key technologies in high performance BLDCM. A brief summarization on present studies in the field of aviation and aerospace for the enhancement of reliability, efficiency and variable speed capability is given, and its research direction in the future also is looked ahead.
This paper presents the synthetic design of the transformer in flyback switching AC-DC converters. Firstly, the maximal power transferred by a standard size magnetic core such as EE-20 or EE-25 is theoretically determined. To obtain accurate analysis, a method based on the nonlinear finite element analysis (FEA) of electromagnetic field is employed. Secondly, from the view of reducing the maximal...
This paper analyzes the maximal power loss in the output diode of flyback switching converter operating in both continuous conducting mode (CCM) and discontinuous conducting mode (DCM). Comparing with the previous work, this paper extends the condition, under which the maximal power loss of the output diode occurs, from the CCM to the DCM. Three correlative tasks are included. Firstly, through an...
During the development of a high power DC-DC converter for a fuel cell vehicle (FCV), we found that the current spikes through the switch devices are too high to gain the high power. On the compact demand of the FCV, the only way is to alter the parameters of components inside the box. The distributed capacitance and inductance of the transformer were adjusted by changing the winding way, the current...
The developed switched reluctance starter/generator system in low voltage is presented, which is made up of the three-phase 12/8 structure double salient reluctance machine, three-phase asymmetric bridge single polarity power converter and the controller. The three-phase 12/8 structure double salient reluctance machine, the three-phase asymmetric bridge single polarity power converter and the control...
Nowadays, characteristics analysis of doubly salient electro-magnet machine is mostly about starter or generator separately, while transient characteristics of switching from starter to generator are less studied. Process of switching from starter to generator is an important part of the whole starter/generator system. In this paper, integral MATLAB model of doubly salient electro-magnet starter/generator...
A design of two-phase hybrid stepping motor driver with current closed-loop control based on the PIC mcu has been presented. A microstepping technique has been implemented in order to meet the requirement of constant torque and smooth movement, which adjusts the current in each winding in sinusoidal fashion. Binary and decimal subdivision are achieved by software programming in the PIC microcontroller...
This paper presents switched reluctance motor (SRM) torque ripple minimization based on the modified multi-level converter. The TSF control has a low torque ripple, good dynamic performance and high efficiency. And the proposed modified multi-level converter has low cost and high performance. For integrated advantages of the TSF method and the proposed modified multi-level converter, a suitable control...
This paper proposes an input-paralleled output-paralleled half-bridge converter based on single half-bridge converter, which is very suitable for the low output voltage and large output current application. All modules share a common capacitor-leg, that can reduce the number of main circuitpsilas capacitors and make topology simple. The traits and rules of combination converter are introduced and...
Loaded switches are frequent for the running electric locomotive. The frequencies, phases and amplitudes between the system voltage and residual voltage may be different when the transformer is put into use. The transient responses at different time points are thus analyzed to determine the optimal time to switch on the locomotive transformer and prevent the damage to the system.
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