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Generator Voltage Control01:21

Generator Voltage Control

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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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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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Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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Wind Turbine Machine Models01:24

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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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Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
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A Distributed Control Scheme Using SiC-Based Low Voltage Ride-Through Compensator for Wind Turbine Generators.

Chao-Tsung Ma1, Zong-Hann Shi1

  • 1Applied Power Electronics Systems Research Group, Department of EE, CEECS, National United University, Miaoli City 36063, Taiwan.

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Summary

A new distributed control scheme for wind turbine generators (WTGs) enhances grid stability during faults. This low voltage ride-through (LVRT) compensator improves efficiency and reliability using advanced digital control.

Keywords:
low voltage ride-through (LVRT)permanent magnet synchronous generator (PMSG)silicon carbide (SiC)-based inverterwind turbine generator (WTG)

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Area of Science:

  • Electrical Engineering
  • Power Systems Engineering
  • Renewable Energy Integration

Background:

  • Increasing renewable energy penetration necessitates robust grid fault management.
  • Low Voltage Ride-Through (LVRT) is critical for grid stability with wind turbine generators (WTGs).
  • Existing centralized LVRT controllers have limitations in dynamic response and efficiency.

Purpose of the Study:

  • To propose a novel distributed control scheme for LVRT in WTGs.
  • To enhance system efficiency and reliability using silicon carbide (SiC)-based inverters.
  • To enable simultaneous reactive current compensation for Doubly-Fed Induction Generator (DFIG) and Permanent Magnet Synchronous Generator (PMSG) based WTGs.

Main Methods:

  • Development of a distributed LVRT compensator (LVRTC).
  • Implementation of a digital control scheme with dq-axis current decoupling.
  • Theoretical analysis, mathematical modeling, and computer simulations.
  • Experimental validation using a 2 kVA hardware system with a digital signal processor (DSP).

Main Results:

  • The proposed LVRTC effectively performs simultaneous active and reactive power control.
  • SiC-based inverters contribute to improved system efficiency and reliability.
  • Simulation and experimental results demonstrate close agreement, validating the control scheme's feasibility.
  • The distributed approach ensures effective reactive current compensation during grid faults.

Conclusions:

  • The proposed distributed LVRT control scheme is feasible and effective for WTGs.
  • The LVRTC enhances grid stability and power quality during fault conditions.
  • The use of SiC inverters and advanced digital control offers significant advantages in efficiency and reliability.