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With the installed volume on wind farm increasing constantly, the impact of wind electricity on public grid has become increasingly evident, which superimposes more and more importance on the study on wind power integration to grid. A solid state transformer (SST) based induction wind power generator grid-connected system is put forward in this paper. The lumped parameter mathematical model of the...
Multiphase generators starts to compete three-phase counterparts. An obvious application for multiphase generators is electrical power generation from wind turbines. Moreover, they can find a slot in conventional generation stations market due to its advantages. The output power from these generators should be processed using power converters but power quality of the line side converter is a requirement...
The renewable energy is the most efficient green energy technology now days. As the stand alone system has many drawbacks, the grid connectivity system and hybrid system are more sustainable form of energy. This Paper has a study and model design of Hybrid system comprising of solar and wind technology for a small locality and the hybrid system is designed with the help of HOMER software. This paper...
This paper proposes a control technique of water pumping system based on wind turbine generator in an isolated area. The turbine is used to drive the PMSG in order to feed an isolated load composed of a DC motor and a hydraulic centrifuge pump. The considered load receives the required active power from the DC generator. The models of the wind turbine, the PMSG Generator and the DC motor are developed...
The authors present the results of experimental work on a small-power direct driven permanent magnet synchronous generator reactive power compensation comparison with two methods. Particular generator is targeted for small size wind power systems, and is tested on a wind turbine emulator that consists of an AC induction motor, a frequency converter and a torque feedback. Generator output power was...
This work introduces a new approach using high frequency (HF) isolation for interfacing next-generation offshore wind turbine generators (WTGs) to medium voltage DC (MVDC) collection grids, a necessity for the continued development of offshore wind resources as farms are sited further out to sea. Initial analysis of the proposed approach is provided, as well as a practical design example for reproduction...
This paper presents the development of the power electronics needed for the interaction between the electrical generator of a wind turbine and an isolated ac micro grid. In this system there are basically two types of receptors for the energy produced by the wind turbine, which are the loads connected to the isolated micro grid and the batteries used to store energy. There are basically two states...
A 0.5μm-CMOS-process optimum torque (OT) control integrated circuit (IC) with an active area of 0.35mm2 is implemented for harvesting the most available energy from and prolonging the lifetime of a wind turbine generator (WTG) in a wind energy conversion system (WECS). This pioneering custom-designed analog IC with low power consumption can be applied to wide power range WECS applications. It achieves...
Permanent magnet traction generators are usually used together with a rectifier, which can be of a controlled or an uncontrolled type. While the controlled rectifier offers a degree of freedom for the optimization of the operating point, the uncontrolled rectifier imposes certain restrictions, and the influence of the parameters of the machine becomes more relevant. One of the main parameters is the...
This paper presents a system analysis of the adjustable speed drive system (ASDS) employing a voltage source inverter (VSI) under fault conditions such as tripping of a gas turbine generator. Investigated system includes four 80 MW VSI-ASDSs, four 105 MW gas turbine generators and two 90 MW steam turbine generators, all connecting to the 132 kV common bus. Proposed VSI-ASDS converts AC power from...
Permanent magnet synchronous generators are mostly designed without an explicit damper cage. When feeding into an intermediate d.c. circuit via a diode rectifier, as in small-scale wind turbine systems, the currents induced in conductive rotor parts may influence the generator operation. A simplified model is used to study sub-transient machine behavior. In quasi steady-state harmonics of order 6th...
Multi-level power electronic topologies are being proposed in the recent technical literature for use in power generating units. Especially when the reduction of the power filter overall dimensions and the lowering of current and voltage waveform ripple and total harmonic distortion are considered of primary importance. This is the case of high speed gen-set units, where recent design techniques on...
Modern AC drives have been extensively used in the Oil and Gas industry, because of their advantages over the DC drives, in terms of speed variation, low maintenance, frequency variation, and high torque throughput. However, significant low frequency harmonics and conducted EMI can be generated at the point of common coupling (PCC). This later can have a dramatic impact on the power factor and consequently...
Bangladesh is experiencing electric power capacity crisis. Access to electricity in Bangladesh is one of the lowest in the world; coverage including Solar Home Systems today stands around 62% of the total population. However the rural areas of Bangladesh where 76% of the population live, is seriously deprived of the electricity facility. [1] Larger energy supplies and greater efficiency of energy...
By simulation, provide a quantitative cost-benefit study of various redundant solar configurations at Remote Off-Grid RBS (Radio Base Stations) to configure the best answer. As the objective of a solar array is to improve finance operational of the site, as demonstrated the application of traditional N+1 or 2N converter solutions are often not the best answer. Proper configuration and over-provisioning...
Wave energy is a very promising source of renewable energy, but its usage is limited by nature of sea waves, which deliver slow reciprocating movement. For this reason, linear electrical generators perfectly suit this application. Geared systems are used in order to make the generator more compact, but they suffer from low reliability and require regular maintenance. Direct drive systems are more...
This paper proposes a predictive control strategy for the voltage stability of brushless excited synchronous generator for the aircraft power system using dead-beat control. The synchronous generator is coupled to the aircraft engine and it delivers the power to 270VDC bus via a 12-pulse diode bridge rectifier. Due to the speed variations of the aircraft engine, the brushless excitation is used so...
In the flexible VSC-HVDC, this paper proposed a coordinated control Strategy of generator side Converters based on series-parallel access with DC bus connection structure. Take variable step hill-climbing algorithm suitable for series and parallel access methods enables the system to achieve the purpose of maximum wind power capture in a safe range. Generator side converter take the double closed-loop...
This paper reports on tests performed to determine the response of common low voltage power supplies when their AC power feed is distorted by various types and levels of harmonic distortion. Such distortion could be a possible form of IEMI attack on a facility. It is found that switched mode power supplies are immune to such attacks, but rectifier type supplies are very susceptible, if the distortion...
Fault monitoring of rotating rectifier in aviation brushless AC generator is a technical problem. Although various diagnosis methods have been developed, they all use the relatively complex algorithms, which increase the software and hardware complexity of generator control unit extremely. A simple and practical monitoring circuit has been designed based on harmonic armature reaction principle of...
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