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Electromechanical actuators for automotive chassis application such as active/semi-active suspensions, electric power steering and electric brakes require high performance electric machines. This paper analyzes the practicality of fractional slot permanent magnet electric machines for these applications based on the full investigation of five candidate machines in terms of electrical, mechanical and...
Voltage perturbations at the input of automotive multi-phase converters with coupled inductors can lead to significant equalizing currents in the converter and perhaps to core saturation and system failure, if adequate balancing control is not adapted. Analyses have been performed to predict the equalizing currents in the coupled inductors dependent on the input perturbations and dependent on the...
The using of large numbers of airborne electronic equipments and electric actuators makes the performance and comfort of new aircraft improved with a leaping development. But it also introduces more harmonics into aircraft power systems. As the specificity of aircraft gird, conventional three-phase four-wire active power filter (APF) has its limitation in aircraft applications. A novel shunt three-phase...
Medium Voltage DC (MVDC) infrastructure serves as a platform for interconnecting renewable electric power generation, including wind and solar. Abundant loads such as industrial facilities, data centers, and electric vehicle charging stations (EVCS) can also be powered using MVDC technology. MVDC networks are expected to improve efficiency by serving as an additional layer between the transmission...
In order to provide AC-DC conversion and power factor correction (PFC), Full-Bridge Single-Stage (FBSS) topologies are the most popular for high performance converters with power levels above 500W. Their behaviour and features are in general well defined and analysed. However, these topologies may introduce several complex operating limits and control problems that are not yet described in literature...
In this paper, minimum DC-link capacitance in PWM rectifier-inverter systems is investigated. Reduction of DC-link capacitor is one of the most effective issues to realize high power-density PWM rectifier-inverter systems. For the extreme reduction of the DC-link capacitor, the minimum required capacitance should be clarified theoretically, and the improved control method should be developed. Firstly,...
A dc-link module composed of dc-link capacitors and a series voltage compensator has been proposed. It has been verified that the module can reduce the dc-link capacitance to 10–20% while achieving a very low voltage ripple across its output terminals. This paper investigates the required dc-link capacitance when a certain period of hold-up time is considered. Trade-off design conditions are presented...
A new three-phase ac-ac converter with a high-frequency ac link, soft switching characteristic, unity input power factor, step-up and step-down operation, and bidirectional power flow is introduced in this paper. The converter's link is composed of an ac inductor and a very small ac capacitor; there is no short-life bulky electrolytic capacitor. Moreover, the converter's switches are zero voltage...
The three-phase three-level Neutral Point Clamped (NPC) topology is widely employed in rectifiers, active power filters, and electric machine drives. This paper proposes an alternative control strategy for the NPC topology based on the One-Cycle Control technique and the Hybrid PWM strategy. Optimal unbalanced load compensation is achieved with the proposed scheme, of which the principal advantages...
This paper describes a switching-surface (SS) controlled dc-dc converter that operates in PFM (pulse-frequency modulation) mode. SS control in continuous-current mode (CCM) has, as an essential property, fast response to load transient. To realize the SS control, a simple circuit that generates a switching function by using only one operational amplifier is proposed. In addition to the CCM operation,...
Power Electronic Transformer (PET) is one of the key elements for the future power electronics based power supply systems, especially in renewable energy field. In this paper, a series of new three-stage three-phase cascaded modular topologies comprising distinct AC-DC, DC-DC and DC-AC stages for large power rating PET are proposed. Comparisons of these topologies based on efficiency, cost, redundancy,...
Europe is rapidly expanding its offshore wind energy capacity. Hence, the construction of a multi-terminal dc (MTDC) infrastructure to accommodate the generated electrical energy brings several advantages, but also comes with many challenges. Operation and control of a MTDC network is one of these challenges. This paper explains the operation and control of MTDC networks. Moreover, a study is carried...
This paper presents an improved DC-link voltage fast control strategy for a PWM rectifier-inverter system to reduce the fluctuation of DC-link voltage. In this paper, a conclusion is drawn based on the instantaneous energy balance analysis of the whole system that the energy stored in the DC-link capacitor will fluctuate during dynamic process in rectifier mode, even in ideal case. Then, when the...
This paper describes a new thermal management approach for cooling of power semiconductor devices. This new approach is based on a liquid metal fluid flow in order to spread the heat and evacuate it to the ambient. The work presented in this paper is considered as a first step to design and realize a liquid metal heat spreader (LMHS) for power electronics devices. In the first part of the paper, the...
In this paper, a method is proposed to measure the junction temperatures of IGBT discrete devices and modules using short circuit current. Experimental results show that the short circuit current has good sensitivity, linearity and selectivity, which is suitable to be used as temperature sensitive electrical parameters (TSEP). Test circuit and hardware design are proposed for junction temperature...
With a growing penetration of Permanent Magnet Synchronous Wind Turbine Generations (PMSG-WT) into the modern power system, a comprehensive modeling and analysis of PMSG-WT is required to investigate its dynamic stability and interaction between large wind farm and power grids. In this work, a complete detailed MW-class variable speed Wind Turbine System based on a Permanent Magnet Synchronous Generator...
Wave energy converter research continues to advance and new developers are continuing to emerge, leading to the need for a general modeling methodology. This work attempts to outline the design methodology necessary to perform frequency domain analysis on a generic wave energy converter. A two-body point absorber representing a generic popular design was chosen and a general procedure is presented...
Boundary Conduction Mode (BCM) and Discontinuous Conduction Mode (DCM) control strategies are widely used for the flyback micro-inverter. BCM and DCM control strategies are investigated for the interleaved flyback micro-inverter concentrating on the loss analysis under different load condition. These two control strategies have different impact on the loss distribution and thus the efficiency of the...
This paper details the study of permanent magnet synchronous generator (PMSG) for wind turbines and its control for maximum power point tracking, while connected to a High Voltage Direct Current (HVDC) bus using a 12 pulse thyristor network. The connection to the HVDC bus is done without the use of a back-to-back converter for the PMSG, reducing the complexity and cost of the PMSG power converter...
This paper proposes a modified Boost converter topology which can supply DC as well as AC loads simultaneously. This topology is realized by replacing the controlled switch of a conventional Boost converter with a voltage source inverter (VSI) bridge network. The duty cycle of the Boost converter, in this case, is controlled by the shoot-through period of any particular inverter leg. The proposed...
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