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An investigation on the reasons for failure of the own needs supply in one of the blocks of a big electrical power plant in Bulgaria has been presented. The investigation presented is based on a computer model, which adequacy is experimentally verified. The computational investigations with the model show that the reliability of the own needs supply depends on the excitation regime of the generators.
A thin-film micro thermoelectric generator (μTEG) applicable to wearable devices is investigated. This μTEG module has a transverse configuration of the Seebeck elements and thus can adapt to microfabrication process with a thin-film thermoelectric material. A design method to maximize the output of the μTEG is developed, and its performance is analyzed. A high output power of 10mW with an output...
Compared with the conventional wave energy conversion, the direct drive wave energy conversion has the advantages of simple structure, high conversion efficiency. In this paper, an energy tracking control strategy is proposed for direct drive wave energy conversion. Firstly, the basic structure of the linear permanent magnet generator (LPMG) is introduced. Secondly, the simulation model of the LPMG...
In brushless doubly-fed generator (BDFG)-based ship shaft power generation system, the two back-to-back converters bring two common mode voltage sources and BDFG's two sets of stator windings provide several common mode current branches, which make the common mode circuit complicated. This paper have listed the common mode current loops and proposed an equivalent common mode circuit model based on...
The paper is concerned with practical modelling of the synchronous generator (SG) as the main component of the hydroelectric power plant. The generation system under study comprises the hydraulic circuit, the speed regulator, the excitation system and the SG. Each system component is formatted into state form. The SG state model developed with field voltage as the only controlled input variable and...
An analytical model is proposed using the d/q-axis model to estimate the maximum output power of the high speed permanent magnet synchronous generator (PMSG) and corresponding current, power-angle, etc. An experimental phenomenon that a 100kW 45000rpm PMSG unable to generate rated power is analysed using the analytical model. Then the rotor structure is improved according to the analytical results...
The paper presents protection coordination of renewable energy source connected to bilaterally supplied distribution network. Multifunctional numerical relays with the switching equipment, renewable energy source facility and the distribution network have been detail modeled in DIgSILENT Power Factory software. Overcurrent, overvoltage, undervoltage, directional overcurrent, underfrequency and overfrequenecy...
Switched Reluctance Motors (SRMs) show great advantages of structural simplicity and high reliability in aerial starter/generator applications. This paper introduces the implementation of a high speed switched reluctance starter/generator system. First, the paper proposes a modeling method for switched reluctance starter/generator system, including switched reluctance machine and power circuit. The...
An electric brake for wind turbine systems is proposed in this paper. Effective emergency electrical braking is needed if an overvoltage occurs due to grid failure. The derived circuits use high power thyristors corresponding to the high values of generated power from today's wind turbines. A practical confirmation with BLDC a generator is ongoing in the laboratory. The principle of operation is proved...
As PV - distributed generation (DG-PV) penetration increases, its reaction with various system disturbances (i.e. voltage drop, short circuit, frequency deviation) has to be taken into account during relative system studies. Though for wind farm generation (WFG) a lot of effort has been made for the development of appropriate models, there is still a lot of progress to be done in the field of PV Generation...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
A new circuit topology is introduced, to build up a power electronic rectifier for applications foreseeing electrical power generation from marine currents. The new power converter seems able to guarantee both DC-side voltages with very low ripple and sinusoidal generator currents. The proposed circuit topology is intended for applications in which, for each power generation unit, two turbines (and...
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