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Turbine-Governor Control

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Turbine-governor control is crucial for maintaining power system stability by balancing turbine mechanical power output with electrical load demand. This mechanism ensures that generator frequency and rotor speed are within acceptable limits during load variations. Turbine-generator units store kinetic energy due to their rotating masses; this energy is released to meet the load requirement when the load increases. The electrical torque of turbines rises to meet the demand, whereas the...
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Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand,...
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A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
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In the growing field of wind energy, incorporating wind turbine models into transient stability analysis is essential. Induction and synchronous machines are the primary models used, with induction machines being prevalent due to their simplicity and reliability.
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DC Generator01:19

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An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
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Sequence Networks of Rotating Machines

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A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
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A Multi-engine Marangoni Rotor with Controlled Motion for Mini-Generator Application.

Guoxin Lu1, Guiqiang Zhu1, Benwei Peng1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing Laboratory of Biomedical Materials, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

ACS Applied Materials & Interfaces
|May 4, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel six-arm Marangoni rotor for enhanced motion control and extended operational lifetime. This self-propelling device, fueled by surfactant gradients, demonstrates improved trajectory control and energy harvesting capabilities.

Keywords:
Marangoni effectenergy conversionmini-generatorself-propulsive devicesmart materials

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Area of Science:

  • Interfacial Phenomena
  • Soft Matter Physics
  • Microfluidics

Background:

  • Marangoni rotors utilize surface tension gradients for self-propulsion, offering potential in various applications.
  • Current Marangoni devices face limitations in motion control (lifetime, direction, trajectory) due to challenges in fuel management.

Purpose of the Study:

  • To design a controllable Marangoni rotor with improved motion characteristics.
  • To enhance the operational lifetime and trajectory control of Marangoni devices.
  • To explore energy harvesting applications using multi-engine Marangoni rotors.

Main Methods:

  • Designed a six-arm Marangoni rotor with multiple, adjustable fuel positions.
  • Employed fuel dilution strategy to prolong motion lifetime.
  • Integrated the rotor with a coil and magnet to create a mini-generator system.

Main Results:

  • Extended motion lifetime by 143% (from 140 s to 360 s) through fuel dilution.
  • Achieved facile adjustment of motion trajectories by altering fuel number and positions, creating diverse rotation patterns.
  • Demonstrated a two-magnitude increase in energy output from the multi-engine rotor compared to single-engine designs.

Conclusions:

  • The novel multi-engine Marangoni rotor design overcomes limitations in concentration-gradient-driven devices.
  • The device offers enhanced control over motion lifetime, direction, and trajectories.
  • The system shows significant potential for efficient energy harvesting from environmental gradients.