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This paper investigates the use of a 3-Phase Buck Type PWM Rectifier with an Integrated and symmetrical Boost converter for generation of the +/−270V dc bus used in new aircraft power networks. The two main targets when designing and building power converters for aircraft applications are high reliability and reduced weight. In this study the use of high voltage 1.2kV SiC MOSFET allows the converter...
Medium Voltage (MV) AC drives are increasingly used in high-power marine applications for running thrusters and main propulsion motors. In this paper, an MV drive solution employing active front-end current source converters is proposed for a synchronous motor based propulsion system. The proposed solution includes two independent drives, each to control one of the two sets of three-phase windings...
This paper proposes a control strategy of an active front end (AFE) rectifier to cope with voltage deviation at the shipboard AC-power system. The voltage sags in naval ships may occur when the step load such as a large pulse power weapon is applied or when faults happen in the grid or generators themselves. In this paper, the capability of AFEs to support voltage is presented for the voltage sags...
The impact of time delays on emulation systems is examined through a simulation model of an aircraft power system demonstrator facility. The aircraft demonstrator uses hardware-in-the-loop (HIL) techniques to command two motor drives so they emulate the dynamic characteristics of the shafts in an aircraft gas-engine. Time delay effects are inherent in HIL test systems using industrial control platforms...
This paper proposes a topology which is based on the traditional LLC resonant converter and has a symmetrical circuit structure to achieve the bidirectional power flow capability. With the advantage of ZVS and ZCS, reverse energy is eliminated, so high efficiency is achieved of the proposed topology, which can be above 97% at full load. In order to be adoptable in bidirectional applications like batteries...
This paper discusses the performances of a power leveling system with a 3.0-MJ, 9500-r/min flywheel energy storage. In term of the cost reduction, this system uses low cost flywheel and the general purpose products. Therefore, time delay that occurs in the measurement circuit can limit the control performance. In order to overcome this problem, a time delay compensation scheme based on Smith predictor...
Flexible distribution of energy and storage resources (FDERS) offers the benefits of increased resource lifetime, optimal energy storage deployment, enhanced controllability and improved system robustness. It is enabled through the use of reconfiguration, variable interface reactances and/or adjustable distributed energy resource (DER) controls to create a cooperative framework among multiple interconnected...
Use of the battery energy storage system (BESS) as a power buffer becomes a feasible solution to mitigate the intermittent wind power characteristic. Due to the cost, utilizing an economical battery capacity is a crucial requirement of the system design. In this paper, dispatch power strategies are overviewed and the min-max method is selected as the most suitable one for integrating the wind power...
This paper proposes a generalized voltage droop (GVD) control strategy for control and power sharing in voltage source converter (VSC)-based multi-terminal DC (MTDC) grids. In the proposed approach, the conventional voltage droop characteristics of voltage-regulating VSC stations are replaced by the GVD characteristics. The proposed GVD control strategy can be operated in three different control modes...
The parallel operation of dc-dc converters is widely used in distribution systems and uninterruptable power supply systems. Droop control along with virtual resistance (VR) is considered a simple and reliable method for achieving wireless power sharing among converters. In order to enhance the efficiency of the conversion system, this paper implements tertiary level optimization control on the basis...
Roughly 1.3 billion people in developing countries still live without access to reliable electricity. As expanding access using current technologies will accelerate global climate change, there is a strong need for novel solutions that displace fossil fuels and are financially viable for developing regions. A novel DC microgrid solution that is geared at maximizing efficiency and reducing system installation...
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