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Impedance-based method is applied in this paper to analyze the relationship between the converter control system and the stability of DFIG grid connected system. The model of DFIG equivalent input admittance considering the phase error of controller system caused by PLL is proposed. The impact of controller proportional and integral gains is analyzed according to the proposed model. Stability of the...
Claw-pole motor has naturally 3D structure, because of the structural complexity. However, it was simplified as a 2D model by linear approximation. The rotor model of PM-assisted claw-pole motor has permanent magnets, as well as a field winding. Then an electric equivalent circuit is developed with a current source and a voltage source. Further, the rotor core saturation problem is treated with a...
Adjustable-voltage-ratio (AVR) magnetoelectric transformer is a new type of power transformer whose voltage ratio between the output and input can be adjusted continuously from the minimum value (e.g., zero) to the maximum value designed. Therefore, given an input voltage with fixed amplitude, the AVR transformer can output one or multiple AC voltages with continuously adjustable amplitudes from zero...
In this paper, an adaptive extremum seeking control strategy with sliding mode is develop to charge the ultracapacitor light rail vehicles. Compared with existing model-based charging algorithms, the proposed extremum seeking (ES) charging control strategy is model-free, which implies that it can handle the ageing effect of ultracapacitors well. Moreover, a sliding mode mechanism is embedded into...
For gaining an effective cooling performance for motor, water cooling is commonly utilized. But as the requirement for power density increasing, solely the water cooling is not sufficient. This is duo to the thermal resistance of the end winding to the water is large. To obtain lower temperature of the end winding, a new cooling method is studied. The stator and the rotor are separated by an ultrathin...
Torque ripple and acoustic noise are two major drawbacks to switched reluctance motors. The abrupt change of phase current is main cause of acoustic noise, while both commutation and current wave shape are two major factors contributing to high torque ripple. In order to simultaneously reduce torque ripple and noise, a specific current modulation based on real inductance profile can be employed to...
To further improve the power density of modern electric drive technologies many motor designers decide to increase the rotational speed of the motor up to several tens of thousands revolutions per minute. Along with these high frequencies of the fundamental wave of the flux density inside the laminated stator cores, the electromagnetic strain of the core and the importance of the iron losses are increasing...
The traditional boost PFC converter in critical conduction mode (CRM) usually suffers from low power factor (PF) in high input voltage and light load conditions due to the influence of the differential mode (DM) capacitor. With the capacitive current flowing into the DM capacitor, the input current has an evident leading phase and a period of dead time in these conditions. In order to solve this problem,...
High Voltage DC systems are gaining widespread attention due to the advances in power electronic devices and converters. MMCs are very popular nowadays in this type of application. This paper first revisits the dynamic equations of the circulating current of a MMC to incorporate a disturbance term. Based on the modified equations, a disturbance rejection controller is proposed to eliminate the double...
This paper proposes a novel coupler structure for wireless power transfer, which takes advantage of both magnetic and electric fields. The coupler contains four metal structures, two each at the primary and secondary sides, which are capacitively coupled. Each structure consists of long strips of metal sheet to increase its self-inductance, which is then inductively coupled with the other three structures...
This paper proposes a wire-bonded design with a unique double-end sourced structure for multi-chip paralleled SiC power modules. The proposed design achieved a reduced power-loop inductance of 7.2 nH, while inheriting the advantages of the conventional wire-bond technology. More importantly, the symmetrical structure of the proposed design brought consistent performances to the paralleled devices...
The total inertia stored in all rotating masses (synchronous generators, induction motors, etc.) connected to a power system grid is an essential force that keeps the system stable after disturbances. Power systems have been experiencing reduced inertia during the past few decades [1]. This trend will continue as the level of renewable generation (e.g., wind and solar) increases. Wind power plants...
A de-sat based short-circuit protection scheme using commercial driver for SiC MOSFETs is presented and experimentally verified on 1200V 3-level T-type SiC MOSFET module in this paper. Response time is very critical for the short-circuit protection of SiC MOSFETs due to the limited short-circuit withstand time (SCWT). Soft turn-off is required to avoid high voltage spike during the turn-off of the...
The two-level single-ended primary-inductor converter (SEPIC) has been used for grid-tied photovoltaic (PV) systems. However, it has high switching losses because of high voltage stresses. To reduce the switching losses, a three-level SEPIC is suggested in this paper. The three-level SEPIC has low switching losses by reducing the switch voltage stress. It improves power efficiency by using a lower-voltage-rated...
A novel, genetic-algorithm based, design method of the passive filter-based phase shifting transformers is presented. The method improves the reliability, effectiveness, and accuracy of the filter. The filter is employed in an interphase power controller (IPC), a FACTS device unique in its power-transmitting properties. The paper demonstrates how the implementation of the proposed filter in the IPC...
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