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Linear Electric Circuits
Published in Pedro Ponce, Arturo Molina, Omar Mata, Luis Ibarra, Brian MacCleery, Power System Fundamentals, 2017
Pedro Ponce, Arturo Molina, Omar Mata, Luis Ibarra, Brian MacCleery
A three-phase system is equivalent to three single-phase circuits because each coil of the generator can be regarded as a single-phase generator. This means that a typical three-phase system consists of three voltage sources that can be either Y-connected or Δ $ \Delta $ -connected, as shown in Figure 1.19.
3-Phase Power
Published in Richard Cadena, Electricity for the Entertainment Electrician & Technician, 2021
A single-phase generator has a single pair of windings that outputs one voltage waveform. 3-phase power is produced by a single generator that has three sets of windings, each of which is physically oriented 120° apart from one another. Each pair of windings generates its own voltage output and, because they are physically oriented 120° apart from each other, the voltage waveforms are also 120° out of phase with each other, as shown in Figure 5.1.
Electrical Issues
Published in Vaughn Nelson, Kenneth Starcher, Wind Energy, 2018
Vaughn Nelson, Kenneth Starcher
Rural electric grids may only have one phase, so a wind turbine connected directly to these utility lines would need a single-phase generator. If a wind turbine is connected through an inverter, the inverter can handle the phase.
Availability of the Emergency Safety Electrical System of a Konvoi Nuclear Power Plant Considering Mobile Arrangements of Diesel Generators After Fukushima
Published in Nuclear Technology, 2023
D. P. Dionizio, P. L. C. Saldanha, P. F. Frutuoso E Melo, C. M. F. Lapa
The normal power supply system provides the necessary energy during the plant’s normal operation, start-up, and shutdown phases. It is subdivided into four redundant trains, physically separated, which are supplied by the secondary windings of the auxiliary transformers (BBT 01/02). The transformers are connected to the main generator and three single-phase generator transformers (BAT 01/02/03) through cables and supplied from the main generator or, during start-up or shutdown, from the external 525-kV electrical system.[27]
Improved TOGI-Based Voltage and Frequency Control for PMSG Feeding Single-Phase Loads in Isolated Pico-Hydro Generation
Published in IETE Journal of Research, 2021
Vineet P. Chandran, Shadab Murshid, Bhim Singh
With the development of permanent magnetic materials, of very high magnetic field per unit weight, the PMSG-based machines have found their applications as generators in hybrid electric vehicles coupled to internal combustion engine and also in diesel generator sets [1]. Some literature has reported the application of PMSG in wind-based generators. A comparative cost analysis per unit torque for seven different topologies of permanent magnet generator for wind energy generation is given in [2]. A multi-pole PMSG implemented in [3] is connected to a converter to eliminate mechanical gear for operating the wind generating systems at low speeds. The main drawback [4], while extracting power from the wind energy conversion system, is the need for tracking maximum power point of operation for varying wind speeds by constantly controlling the generator currents and the torque. Numerous publications have emphasized on different configurations and control of PMSG in WECS. However, very few have reported on the use of these generators for hydel-based power generation. An electronic load controller [5] is a vital part of most hydro systems operating in isolated regions for controlling voltage and frequency. Many publications [6–8] have reported the design, control and implementation of these controllers for three-phase and single-phase self-excited induction generators (SEIG). These controllers have been implemented for SEIG-based isolated hydro schemes. These schemes are generally installed in isolated areas where majority of the connected loads are single phase in nature [9–11]. A single-phase generator can also be used for power generation. However, these generators can provide limited power output compared to a three-phase machines. A three-phase machine in single-phasing mode by connecting two terminals to the load appears to be a viable solution if its terminal voltage and frequency can be controlled using a static controller. Many methods are developed for operating three-phase SEIG in single-phase mode. Furthermore, this operation creates unbalanced voltages and currents across the generator terminals. Therefore, to deal with this problem, appropriately designed VSC has been used in parallel with the load [12–14]. As the cost of power electronics devices is declining, more cost-effective electronic load controller (ELC) [15] can been designed for SEIG operating in such hydel schemes.