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The purpose of the paper is to investigate the application of a Switched Reluctance Generator (SRG) for future wave energy converters. This machine presents some favourable features as compared to others. The machine optimal operation can be obtained after a detailed assessment of the control strategy. For this purpose, a SRG model is implemented in Matlab® Simulink® environment to find out the values...
After the blackout state, system operators must do all necessary action in order to restore the supply to disconnected loads. Grid restoration process can be formulated as optimization problem which encompasses status assessment, optimization of generation capability and load pickup. A specific restoration strategy is determined by a combination of the actions and operational constraints based on...
In this time, Multilevel Inverter (MLI) innovations turn into an unimaginably primary decision in high power medium voltage energy control range. Despite the fact that multilevel inverter has various advantages but since of utilizing more number of semiconductor switches, it has disadvantages in the vein of high level, extensive size and high cost. To defeat this issue another multilevel inverter...
The article highlights the problems of the efficiency of vibration test methods and means. It gives the brief overview of existing methods. It also gives characteristics of the developed multi-channel vibration measurement machine, its component parts and the benefits of its application. The test results are given that prove that the developed vibration vibration measurement machine allows to reproduce...
In this paper a Marx generator principle has been used to generate a 1.6 kV pulse at the output. Two groups of capacitors with anti-parallel charging is employed [6]. In order to reduce the switching and conduction losses resonance phenomenon has been used to trigger the switches. Insulated Gate Bipolar Transistor (IGBT) switches are employed to connect the charged capacitors in series to supply the...
The paper presents the ways of improving output voltage spectrum in switched-mode generators. Because of errors arising while setting the transistors' switching times, it is rather difficult to achieve the required compensation of higher harmonics. Switching times errors are caused by the inertia of the switching process in power transistors as well as sampling errors of control devices. Analysis...
In this paper, a novel ac/dc converter is proposed for low voltage, low power rectification applications. The proposed converter manages the energy harvested from micro-scale electromagnetic transducers. It integrates the conventional Boost and Buck-Boost topologies with a shared inductor, a bidirectional switch and two split filtering capacitors. The Boost and the Buck-Boost topologies function in...
The work describes the modeling and simulation of a renewable energy based hybrid power system in the aspects of improving power quality and system reliability. An Energy Management and Control Unit (EMCU) is also proposed. For meeting the sustained load demands during varying natural conditions, different renewable energy sources and converters need to be integrated with each other. The paper focuses...
This paper proposes a new single-input three-output DC-DC buck converter. The proposed topology has two less switching devices than that of a conventional converter. This reduction in switching devices results in lower cost and a more even distribution of power losses among the switching devices. A comprehensive small signal Modeling and control strategies for the proposed converter will be presented...
The memristor was originally defined as one of the fundamental electrical elements which provided the vacant connection between charge and flux. So far, most of the research has concentrated on the unique features of the individual devices. And the overall behavior of the multiple memristive systems has not been fully studied. Especially, the lack of corresponding fault diagnosis method for complex...
A simple and cost-effective software-based resolver to digital converter together with a permanent magnet synchronous motor control system were presented. The proposed method incorporates software generation of the resolver carrier and using anti-tangent calculation for synchronous demodulation of the resolver outputs signal in such a way that there is a substantial savings on hardware like the costly...
Wind energy conversion systems (WECSs) have become increasingly popular in the recent years for clean power generation. For all forms of electricity generation, it is important that these sources are reliable and resilient with the ability to sustain abnormal contingency conditions such as electrical faults. Effective electrical protection systems play an important role in enhancing this resilience...
Islanded operation of HVDC sending system can reduce the influence of HVDC fault on the parallel AC system, enhance the security of the system and increase the transmission capacity. Due to relatively small system inertia and ESCR, there are difficulties of the frequency and voltage control in the islanded sending system. The conventional analysis are focuses on the process after HVDC bipolar trip...
The control system is a key technology to extract maximum energy from the incident wind. By regulating aerodynamic control, it is possible to adapt the changes in wind speed by controlling shaft speed. Thus, the turbine generator can track maximum power extracted from wind. In this paper, we propose a Lyapunov based switching control under quasi-linear ARX neural network (QARXNN) model to track maximum...
This paper presents a control scheme for transmission networks by using load-side controllers which cooperate with automatic generation control (AGC) to restore the power system frequency. A switched consensus-based distributed controller is designed for each load bus in the transmission network. Once the frequency exceeds a pre-selected threshold, each load-side controller will start to discover...
This paper proposes a closed transition transfer switch (CTTS) based on a photovoltaic inverter which is capable of transition between grid-connected and island modes. The proposed system consists of the CTTS, utility grid and photovoltaic inverter connected to each input, respectively, an active load with power factor correction, and a system controller. According to the grid condition, the system...
As part of the LHC Injector Upgrade (LIU) project, the production of a high-intensity proton beam in the Proton Synchrotron Booster (PSB) at CERN will be achieved by injecting a beam of H− ions from the new linear accelerator LINAC4. During the injection process the two electrons of the H− ions are removed with a stripping foil across which the machine orbit is shifted to fill the machine aperture...
In this contribution, we present a 15-stage, avalanche transistor Marx generator using inexpensive 2N5551 transistors. It can be used in low-power biomedical, environmental and food applications where compact circuits to generate high-voltage pulses are required. We characterized the avalanche transistors and built a test setup with 15 stages which provides 1.3-kV pulses into a 50 Ohm load and over...
A high repetition rate, semiconductor based, Marx generator has been designed and developed for a spark gap system: this system will allow the study of breakdown rate phenomena for different materials and surface finishes, for RF structures for the proposed Compact Linear Collider (CLIC). The Marx circuit is based on new SiC MOSFETs (Metal Oxide Semiconductor Field Effect Transistors), with 15 compact...
Pulsed power technology has been used for the ablation tumor. Considerable research shows that a high-strength unipolar pulse electric field can induce irreversible electroporation (IRE) on the cell membrane, which can effectively kill cells. But some scholars and doctors have found that muscle contractions occur during treatment, which are associated with the delivery of electric pulses. Confirmed...
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