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The half-wave rectifiers have been adopted in the wound field doubly salient generators (WFDSGs). To improve the output power, a new half-wave rectifier with the controllable conduction angle for the WFDSM is presented in this paper. With a 12/8-pole WFDSM prototype, the finite element method is used in the simulation. The operation process with the new control scheme is analyzed. The simulation curves...
Full load back-to-back test of VSDS’s (Variable Speed Drive Systems) are sometimes required for oil and gas projects. VSI (Voltage Source Inverter) technology is becoming the drive system of choice for super large compressor drives, up to 100 MW. Special consideration /facilities are necessary to perform back-to- back tests for VSDS driven by VSI, because the type of converter used for such large...
Direct drive linear generators have been shown to be a viable method for ocean's wave energy conversion. This generation system converts the wave oscillation into linear movement through a buoy defined as a point absorber system. The direct drive generator presents no mechanical accumulator element like a pressurized vessel common in no direct drive generators. Hence the DC link of the power electronics...
This work proposes a solution to enable the operation of diesel generators that supply line-frequency phase-controlled rectifiers to charge battery banks in isolated microgrids. The solution consists of the use of resonant filters, tuned to the harmonic frequencies that must be suppressed from the AC source line currents. In addition to the resonant filters, a circuit topology is proposed to attenuate...
Reliability and safety issues of the electrical power generation systems becomes more and more popular research topic - especially analysis of the electrical power supply systems operation under fault conditions like e.g. overload or short circuit. Appropriate topology of the rectifier is required to provide stable output voltage and control of the supplied AC current. One of the rectifier topologies...
In power system restoration process, the major issue is to identify the Black start unit, by providing cranking power to the unit and abundant start-up time for the Black-Start unit generator to start. There are many issues that arise in the delaying Blackout restoration process. This paper is proposed to avoid the faced issues by Electric vehicle charging station that act as Black-start unit to provide...
Energy Harvesting is crucial to the development of miniaturized implants to achieve minimal invasiveness and system autonomy. While RF wireless power transfer suffers from substantial tissue attenuation, a wireless piezoelectric energy harvester (PEH) is more attractive for deep-tissue implant applications [1]. Typical PEH interfaces with a full-bridge rectifier for AC-DC conversion with limited extractable...
Wind energy is one of the most promising and developed renewable energy resources. A power electronic interface is needed in order to connect a Wind Energy Conversion System (WECS) to the load or the utility grid. Control of this interface, which consists of generator- and grid-side converters, is a very important and demanding task. The main purpose of controlling the generator-side converter is...
The objective of the proposed scheme is to extract the maximum power at different wind turbine speed. In order to achieve this, MPPT controller is implemented on the rectifier side for the extraction of maximum power. On the inverter side normal closed loop PWM control is carried out. MPPT controller is implemented using fuzzy logic control technique. The fuzzy controller's role here is to track the...
A robust and reliable wind power evacuation scheme through a Permanent-Magnet Synchronous Generator (PMSG) is proposed in this paper. In this topology, a generatorside passive bridge rectifier and a grid-side Buck Boost Inverter (BBI) is employed to facilitate an efficient and economical Wind Energy Conversion system. In BBI, the peak value of the alternating output voltage is independent on the direct...
This paper presents the design of a micro-grid with permanent magnet brushless DC (PMBLDC) generator based wind energy conversion system (WECS) and Solar PV along with stand-alone loads. The output of the PMBLDC is converted to a controlled DC bus voltage using a PWM rectifier through which independent real and reactive power control are achieved. This DC bus is common to both solar PV and WECS. A...
This study proposes a control system design for Electrical Network Connected Wind Farm (ENCWF) using Direct Drive Permanent Magnet Synchronous Generator (DD-PMSG). The generators are connected to the power network by Voltage Source Converter (VSC) with a dc-link. The proposed scheme is based on Backstepping technique and regulates the powers exchanged between the ENCWF and the electric network to...
In this study, a series resonant converter is designed in order to improve power generation capability of surface mounted permanent magnet generator over a wide speed range while considering the current limits of the machine. A simple and mostly accurate design approach for the series resonant converter has been developed by considering the dynamic characteristics of the surface mounted permanent...
The use of power electronic devices in more electric aircraft is pervasive, thus higher requirements of power quality have been proposed in the aircraft. Moreover, the protection and control logic of the aircraft power supply system plays an important role in aircraft systematic design, which may influence reliability, redundancy and fault tolerance. Considering the multi-domain characteristics of...
This paper proposes an interior-permanent-magnet synchronous generator suitable for wide-speed-range operation and its DC voltage control strategy, which makes this system a promising candidate for 270V DC power system in more electric aircraft applications. The machine is designed and manufactured to have a strong field-weakening capability. An active rectifier is utilized for DC-link voltage stabilization...
This paper proposes a comprehensive simulation model for the Electrical Power System (EPS) of More Electrical Aircrafts (MEA). Taking the presently typical MEA model of Boeing 787 as an example, the integrated structure of EPS is firstly illustrated and the operating principles are theorized. The key components of the MEA EPS including generators, rectifiers, loads, breakers, control devices, cables...
Phase-shift transformers have been widely used for harmonic cancellation in a large-scale three-phase motor drive system. For a shipboard with multiple sources and loads, a shunt-connected phase-shift transformer can serve as harmonic path to conduct certain harmonic contents. This paper shows how the harmonics can be cancelled in a dual drivetrain system of a shipbboard. A laboratory scale of two...
As renewable generation has become less expensive during recent decades, and it becomes more accepted by the global population, the focus on renewable generation has expanded to include new types with promising future applications, such as river and tidal generation. Although the utilization of power electronics and electric machines in industry is phenomenal, the emphasis on system design is different...
The paper presents a comparison of the power output of wind driven generators coupled to active and passive converter circuits at certain site in Bulgaria. A table compares the power output difference expressed in percent. Actual wind resource data gives the opportunity to have evaluation and analysis at three different heights. Advantages of active and passive control are derived and summarized....
Renewable energy generation has experienced significant cost reductions during the past decades, and it has become more accepted by the global population. In the beginning, wind generation dominated the development and deployment of renewable energy; however, during recent decades, photovoltaic (PV) generation has grown at a very significant pace due to the tremendous decrease in the cost of PV modules...
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