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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...
The modular multilevel converter (MMC) with cascaded full bridge cells is available for an AC/AC transmission system without transformers in high voltage line. When it is interconnected with power line, it is possible to control the active power flow in order to supply the power to the power line. This research applied the MMC to grid connection system of distributed generator for single phase AC/AC...
This paper presents Permanent Magnet Synchronous generator (PMSG) based a variable speed wind turbine systems including energy capacitor system (ECS). The ECS is the combination of electric double layer capacitor (EDLC) known as supercapacitor and power electronic devices for wind power application with its detailed modeling and control strategy which can supply smooth electrical power to the power...
AC/AC modular multilevel topologies, such as Modular Multilevel Matrix Converter, Hexverter, and Modular Multilevel Converter in back-to-back configuration can be still operated when one or more modules failed, even if no extra module was added for redundancy. This paper proposes two novel approaches for the operation of these converter topologies with a reduced number of modules in wind energy systems...
Although standards and tools of model transformation have gradually improved in recent years, a theoretical system about model transformation from the integrity perspective has not been put forward, which is important for building the model transformation process strategy and determining the feasibility and reversibility of a model transformation. This paper presents a model transform theory framework...
This paper considers the control of a 7-leg back-to-back Voltage Source Inverter (VSI) arrangement feeding a 4-wire load from a 3-phase Permanent Magnet Synchronous Generator (PMSG) operating at variable speed. The 7-leg converter is regulated using Resonant Controllers (RCs) at the load side and self-tuning resonant controllers at the generator side. The control system is augmented by a feed-forward...
An experiment system of a scaled-down monolithic radial transmission line (MRTL) for future Z-pinch drivers was established to testify the validity of 3-D electromagnetic (EM) simulation. The MRTL had a hyperbolic impedance profile. Being immersed in deionized water, the MRTL was composed of two flat aluminum plates separated by a distance of 1 cm. The radius of both plates was 0.5 m, which corresponds...
The double-fed inductor generator (DFIG) is one important type of wind generator. Because of high percentage of wind energy, it is necessary to build accurate wind generator model and parameters for power system electro-mechanic simulation. The paper mainly presents the simulation model and parameter identification method of DFIG type wind generators. For power system transient simulation, the characteristic...
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...
This paper presents a power convertor design of a 60kW three-phase asymmetry half-bridge power convertor for switched reluctance machines (SRM). With established topology, voltage overshoot is sufficiently analyzed theoretically. To minimize voltage overshoot, this paper optimized the structure of main circuits, snubber capacitors and drive circuits. When dealing with main circuits structure, a low...
The power quality is largely affected by the injection of Power to the grid from wind turbine. After connecting wind turbine, the parameters related to the power quality problems are measured and assessed as per IEC Standard (IEC 61400-21). As per power quality concern, there are seven parameters, Voltage Unbalance, Harmonics, Inter-harmonics, Active power, Reactive power, Grid protection and reconnection...
This paper presents the thermal feasibility study of rotary converter generation systems (RCGS) which solve maintenance problem as wear of brush of slip rings of doubly-fed induction generators. The total structure of RCGS is revealed. The thermal analysis of the structure is conducted. The analytical result shows the structure fulfills the thermal limits of RCGS components under 5MW rated conditions...
In this paper, thruster startup effects on the grid power quality of an All-Electric-Ship are investigated. The case of a Roll on-Roll out (Ro-Ro) ship power system is considered. More specifically, power system parameters are evaluated while a thruster motor starts either directly connected to the main voltage bus of the ship or driven by an electronic soft starter controlled by different control...
Grid integration of distributed energy resources (DERs) is gaining importance in the field of power electronics research. Experimental evaluation of control strategies and detailed evaluation of power interfaces usually require significant allocation of time and resources. This is where the power-hardware-in-the-loop (PHIL) techniques help accelerate control design and evaluation processes. The paper...
This paper demonstrates the stabilization of a large power system with a high penetration of Renewable Energy Sources, such as wind or photovoltaic, using Voltage Source Converter based HVDC links. Due to the reduction of system inertia, frequency oscillations are expected to increase unless additional control measures are added to the system. Based on global power system measurements, a Model Predictive...
Renewable energy is gaining its importance widely on because of continuous degrading of conventional energy resources. Due to the intermittent availability of renewable energy sources which makes the system variable in nature, the involvement of power electronic components gain its importance. This paper investigates the various methods practiced in power electronic interfaces to tap energy from hybrid...
In this work a micro grid concept for a village in the Himalayas is presented. The unique feature of these micro grids is that they use locally available resources, such as solar, wind, water stream and biomass for electricity generation. In order of estimate the current electricity consumption and future demand, door to door survey was done. Based on this survey the power consumption pattern for...
In this study, the design and application a LED armature and a LED driver DC-DC buck convertor supplying from a thermoelectric generator designed as portative for low temperature geothermal areas have been carried out. The design of the LED armature of about 25 W has been made suitable by the IP67 protection standard. The DC-DC buck converter used with the LED armature was operated at a maximum yield...
Wind energy conversion systems (WECS) is currently a hot topic for electrical and electronic engineers because of the wide range of topologies that both manufacturers and researchers are designing. Different types of electrical generators, power converters and configurations have been recently proposed and this serves as a centre of interest for engineering students. Wind energy is also an application...
Supercapacitors are increasingly used as short term energy storage elements in distributed generation systems. The traditional approach in integrating them to the main system is the use of interfacing dc-dc converters which introduce additional costs and power losses. This paper therefore, presents a novel direct integration scheme for supercapacitors and thereby eliminates associated costs and power...
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