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The structure of rotating diode rectifier were proposed in this paper to solve the excitation problem of brushless wound-rotor synchronous starter/generator. Rotating diode rectifier plays an important part of excitation system of main generator. Triple Rectifier was adopted to take the place of three-phase rectifier. The three phase armature windings connect to a full-bridge rectifier each other...
This paper investigates the operating modes and converter options of dual winding permanent magnet synchronous machines (DWPMSMs) that are used to drive accessories in hybrid electric vehicles. In this application, DWPMSM operate in three different modes: 1) motor-only; 2) generator-only; and 3) simultaneous motor-generator modes. Motor-only and generator-only operations can be treated independently...
The United States Navy's future fleet of vessels will deploy an increasing number of high power electrical loads that will operate in a transient nature. As the electrical requirements increase, the efficiency of power conversion will become more important than ever before. Converting AC power to DC power can be very inefficient due to the generation of harmonics that are injected into the power system...
This paper deals with the modeling and control of a Wind Energy Conversion System (WECS) based on a Permanent Magnet Synchronous Generator (PMSG). The WECS operate at variable speed and the control algorithm is based on Direct Power Control (DPC) with an AC/DC conversion system with a PI controller for the DC bus output. The laboratory test system is developed with an emulator of a wind turbine and...
A three-phase bridge rectifier with one-controlled branch for permanent magnet (PM) small-scale wind turbine or automotive alternator is described. Operational principles and control algorithm are presented. The experimental results obtained for the developed rectifier are compared to those obtained for classic full-bridge controlled and semi-bridge rectifier. Finally, the advantages and limitations...
The purpose of this project is to analyze the technical possibilities of implementing a sustainable gym, where all the electric energy generated by sport machines, is injected into the grid. In a first phase it will be include electric generators to the static bicycles based on permanents magnets generators (PMG), so that all the energy is injected to a DC bus. Subsequently an electronic inverter...
This paper presents a low power and area-efficient passive tag IC for biomedical applications. CMOS gate cross-coupled rectifier with a diode is built to achieve high power conversion efficiency without redundant control circuits. The demodulator adopts the adaptive threshold generation technique to detect the small RF envelope changes on 10% ASK signals. Inverter-based clock generator consumes only...
This paper presents a grid-connected Wind Energy Conversion System (WECS) using a permanent magnet synchronous generator (PMSG) operating with variable speed. A maximum power point tracking (MPPT) algorithm is used to determinate the power to be extracted from the generator for each rotational speed while wind power remains lower than the PSMG rated power. Otherwise, the MPPT algorithm is disabled...
This work introduces a new method for connecting offshore wind turbine generators (WTGs) in series when interfaced to a medium voltage DC (MVDC) collection grid. Limiting the series stacking to pairs of WTGs and introducing a power sharing converter (PSC) stage between them allows series connected WTGs to operate at independent power levels in a voltage sourced collection grid. This allows for reduced...
Apart from all superfluous renewable sources, the wind power is the renewable resource which is gifted one. The major complications in these types of systems are to store the power to accomplish the necessity of load when the power due to wind is unattainable. This paper incapacitates the problematic of energy storage system in wind power generation system (WPGS). To accomplish this requirement, an...
Permanent magnet synchronous generators used in small scale wind generating systems connected to the grid employ various types of power electronic converters. This paper reviews and gives a systematic classification of many power converter topologies available in the literature based on the electrical isolation between the generator and the grid. Emphasis is given on the type of rectifier used on...
The article describes the issues of stability research of the isolated electric power systems (EPS) with a wind-diesel hybrid power stations (WDHPS). One of the problems associated with the operation of such systems is synchronization of diverse energy sources. Incorrect choice of operating mode may lead to loss of system stability and, thus, to power interruption. The authors carried out analysis...
This paper proposes the utilization of an analytical electrothermal model for evaluating the performance of the IGBT based three-level neutral-point-clamped rectifier for the synchronous reluctance generator in the wind power application. The proposed model is used for evaluating the losses of the generator-side three-level neutral-point-clamped rectifier topology that is utilized in the wind turbine...
Marine high-power on-board electrical systems are predominantly utilizing three-phase medium voltage alternating current (MVAC) distribution. Depending on the size and purpose of the ship, on-board electrical systems provide supply to loads in excess of 60MW. Increasingly, medium voltage direct current (MVDC) distribution systems are being considered as an alternative. An increase in the fuel efficiency...
This paper proposes a system to connect a small wind turbine to the electric grid, which controls the current injected into the mains and it tracks the maximum power of the generator. The proposed system is based on a three-phase diode bridge rectifier, a DC-DC Forward converter that provides electrical isolation, gain and control, and a Full-Bridge inverter, which it is fed in current and it is switched...
This paper proposes a circuit, which can change the winding connection of a generator from the star connection mode to the delta connection mode by changing the circuit operation. In the conventional method, the outage time exits during the dead-time of two magnet contactors. Therefore, the generator current cannot maintain its continuity. Moreover, the surge voltage occurs in the terminal of the...
This paper presents a rotational energy harvester using brushless direct current (BLDC) generator to harvest ambient energy for quadcopter in order to prolong it flight duration. For a quadcopter its endurance is essential in order to achieve operational goals such as scientific research, security, surveillance and reconnaissance. Because quadcopters have a limitation on size and mass they cannot...
Supply of power is an increasing cost factor in the operation of base transceiver stations (BTS). Selecting the optimized power system for a set of site requirements is key to minimize total cost of ownership (TCO). In this paper we show how dimensioning of a power system through combined technical and commercial simulation helps to optimize the system configuration. The savings on fuel and diesel...
In this paper, a gearless PM Synchronous Machine (PMSM) maximum power point tracking (MPPT) approach with single stage AC/DC conversion is presented. The proposed topology employs multilevel converter using Switched-Capacitor-Cell-Based (SCCB) converter to convert the three phase AC generated voltage by the PMSG to a fix DC link voltage in a single stage. The advantage of employing multilevel converter...
Dynamic performances of a practical scale wind power plant consisting of series-connected ten wind turbine generators and a current-source thyristor inverter are discussed. It is shown that tip speed ratios of the individual turbines can be controlled almost constant at an optimum value with the tip speed ratio control, making an effective operation of the system possible. Also the effects of control...
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