Name: wind turbine types and generator control
Uploaded: 2024-11-21T14:54:38.000Z
Duration: 1 min 24 s
Channel: JoVE

K12 Standards

Texas Essential Knowledge and Skills

High School

Earth Systems Science

112.49.c.12.

112.49.c.12.E.

Wind Turbine Machine Models

There are four types of wind turbines. Types 1 and 2 are induction machine models, where stator windings induce AC rotor currents via relative motion between the magnetic field and rotor.
The difference between per unit synchronous and rotor speeds is quantified as slip.
This model includes equivalent voltage behind stator resistance and transient reactance.
Transient stability initial conditions are determined by setting two differential equations to zero and using power flow real power injection and terminal voltage as inputs.
The negative reactive power produced indicates power consumption by the induction machines.
Type 1 turbines feature a squirrel cage rotor with fixed resistance, while Type 2 employs wound rotor induction machines with a control system to adjust rotor resistance.
Type 3 wind turbines, also known as Doubly-Fed Asynchronous Generators, use wound rotor induction machines.
The rotor windings connect to the AC network via an AC-DC-AC converter, allowing separate control of real and reactive power.
Type 4 turbines use a fully asynchronous design where the machine&#39;s output connects to the AC network through an AC-DC-AC converter.

wind turbine machine models

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.
Induction machines interact through the rotating magnetic field generated by the stator and the rotor. The key parameter is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is zero at synchronous speed, positive when motoring, and negative when generating. The mechanical dynamics involve the inertia constant (H) and the torque difference (Tm-Te).
A simplified electrical model for a single-cage induction machine represents the equivalent voltage behind stator resistance and transient reactance. The key parameters include the open-circuit time constant for the rotor and the synchronous reactance derived from leakage reactance and magnetizing reactance.
The electrical torque and terminal real power injection are determined by the machine&#39;s internal voltages and currents. Induction machines typically consume reactive power, indicated by a negative value.
Wind Turbine Models are of four different types:
Type 1 and Type 2: These models use induction generators. Type 1 has a fixed rotor resistance, while Type 2 uses variable rotor resistance for better control, affecting the machine&#39;s time constant and power output.
Type 3 and Type 4: These advanced models (Doubly-Fed Asynchronous Generators and Full Converter Systems) allow for control of both real and reactive power. Type 3 uses converters for rotor current control, providing a wide speed range. Type 4 decouples the generator from the grid, offering flexible control and eliminating mechanical coupling with turbine dynamics.
Understanding wind turbine machine models involves analyzing the interaction of electrical and mechanical components for accurate stability analysis.

There are four types of wind turbines. Types 1 and 2 are induction machine models, where stator windings induce AC rotor currents via relative motion ...

Education

JoVE Core

Electrical Engineering

Unit 1

Transient Stability and System Controls

KEY TERMS AND CONCEPTS

wind turbine types and generator control

Wind turbine machine models are used to study how wind turbines behave in transient stability analysis. In this setting, induction machines and synchronous machines are the main model types. Induction machines are common because they are simple and reliable.

Induction machines work through the rotating magnetic field made by the stator and rotor. A key term is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is zero at synchronous speed, positive during motoring, and negative during generating.

The mechanical side of the model uses the inertia constant, H, and the torque difference between mechanical torque, Tm, and electrical torque, Te. A simplified single-cage induction machine model shows an equivalent voltage behind stator resistance and transient reactance. Other important parameters include the rotor open-circuit time constant and the synchronous reactance, which comes from leakage reactance and magnetizing reactance.

Electrical torque and terminal real power injection depend on the machine’s internal voltages and currents. Induction machines usually consume reactive power, so this value is negative. Wind turbine models are grouped into four types, and each type handles control in a different way.

Type 1 and Type 2 models use induction generators. Type 1 has fixed rotor resistance. Type 2 uses variable rotor resistance, which improves control and changes the machine time constant and power output. Type 3 and Type 4 are more advanced. Type 3 is a doubly-fed asynchronous generator that uses converters to control rotor current and supports a wide speed range. Type 4 is a full converter system that decouples the generator from the grid, gives flexible real and reactive power control, and removes the mechanical link to turbine dynamics.

Wind Turbine Types and Generator Control

the swing equation

Generator Rotor Motion and the Swing Equation

Generator rotor motion is described by the Swing Equation in power system dynamics. It is used to study generating units such as three-phase synchronous generators. The equation comes from Newton’s second law applied to the generator rotor. It links inertia, angular acceleration, and the balance between mechanical and electrical torques. In steady-state operation, the mechanical torque supplied to the generator is equal to the electrical torque produced by the generator. When these torques...

simplified synchronous machine model

Transient Stability in Synchronous Generators

The synchronous machine model helps students analyze transient stability in power systems. It represents a synchronous generator under balanced three-phase positive-sequence conditions. The model assumes constant excitation and ignores losses and saturation. These simplifications make it easier to study how a generator behaves during a disturbance. In this setup, the generator is connected to a network of transmission lines, transformers, loads, and other machines. That larger system is often...

multimachine stability

Power-System Stability in Multi-Machine Networks

Power-system stability in multi-machine networks focuses on how several synchronous machines behave as they stay connected to an N-bus power system. The analysis solves the swing equations for the machines and tracks how the network responds when conditions change. It is used to study transient stability, which is the system’s ability to stay in step after a disturbance. The network is written with nodal equations that link bus voltages, machine voltages, and machine currents. In this model, V...

Wind turbine machine models are used to study how wind turbines behave in transient stability analysis. In this setting, induction machines and synchronous machines are the main model types. Induction machines are common because they are simple and reliable. Induction machines work through the rotating magnetic field made by the stator and rotor. A key term is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is zero at synchronous...

generator voltage control

Voltage Regulation in Generators and Wind Turbines

Generator voltage regulation helps keep synchronous generators and wind turbines working stably. Older systems use a DC generator driven by the rotor to supply DC power to the rotor field winding. That power is passed through slip rings and brushes. Newer systems use static exciters or brushless exciters. A static exciter rectifies AC power from the generator terminals and sends DC power directly to the rotor. A brushless exciter uses an inverted synchronous generator, takes AC power from...

turbine-governor control

How Turbine Governors Stabilize Power Output

Turbine-governor control helps keep generator frequency and rotor speed stable when electrical load changes. It does this by matching turbine mechanical power with the power demand on the system. In a power grid, that balance is important for steady operation. Turbine-generator units also store kinetic energy because their parts are rotating. When load increases, that stored energy is released to help meet the demand. At first, electrical torque rises while mechanical torque stays nearly...

load-frequency control

Load-frequency control in power grids

Load-frequency control keeps a power grid stable when electrical demand changes. It helps keep system frequency and power flow within acceptable limits. Turbine-governor control reduces rotor speed changes after a load shift, but a steady-state frequency error can still remain when the turbine-governor reference setting does not change. In an interconnected power system, each area agrees to export or import a scheduled amount of power through tie-lines, which are the transmission lines that...

key terms and concepts

Learn how wind turbine models use induction and synchronous machines, slip, torque, and converter control to explain Types 1–4 and grid behavior.

Wind Turbine Types and Generator Control | JoVE K12

JoVE Core Electrical Engineering offers easy-to-understand animated videos that cover fundamental concepts of electric circuits along with circuit analysis techniques. It incorporates first-order and second-order circuits using operational amplifiers and circuit transformation concepts. The inclusion of practical design examples and real-world applications through scientist-in-action videos adds significant educational value, making complex concepts accessible.

electrical engineering

elispot-assay-detection-of-ifn-secreting-splenocytes

ELISPOT Assay: Detection of IFN-&#947; Secreting Splenocytes

Source: Tonya J. Webb1
1 Department of Microbiology and Immunology, University of Maryland School of Medicine and the Marlene and Stewart Greenebaum ...

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global ...

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced ...

Evaluate the impact on humans of natural changes in Earth's systems such as earthquakes, tsunamis, and volcanic eruptions;

112.49.c.12.A.

What is Weather?

Overview

Weather refers to the current state of atmospheric conditions at a specific time and place. Weather is temporary and is influenced by the ...

Analyze the impact on humans of naturally occurring extreme weather events such as flooding, hurricanes, tornadoes, and thunderstorms;

112.49.c.12.B.

Analyze the natural and anthropogenic factors that affect the severity and frequency of extreme weather events and the hazards associated with these events;

112.49.c.12.C.

Sustainable Development

As the human population continues to grow and use resources, we must be mindful of our planet&rsquo;s natural limits. Sustainable development provides a ...

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited ...

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among ...

The Nitrogen Cycle

Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of ...

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, ...

The Sulfur Cycle

Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the ...

The Water Cycle

The Earth&rsquo;s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, ...

Dye-sensitized Solar Cells

Source: Tamara M. Powers, Department of Chemistry, Texas A&#38;M University
Today&#39;s modern world requires the use of a large amount of energy. While ...

Proton Exchange Membrane Fuel Cells

Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University
The United States consumes a large amount of energy &#8211; the current ...

Predict how human use of Texas's naturally occurring resources such as fossil fuels, minerals, soil, solar energy, and wind energy directly and indirectly changes the cycling of matter and energy through Earth's systems; and

carbon-and-nitrogen-analysis-of-environmental-samples

Carbon and Nitrogen Analysis of Environmental Samples

Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University
Elemental Analysis is a method used to determine elemental composition of a ...

Explain the cycling of carbon through different forms among Earth's systems and how biological processes have caused major changes to the carbon cycle in those systems over Earth's history.

112.49.c.12.F.

Science concepts. The student understands how Earth's systems affect and are affected by human activities, including resource use and management. The student is expected to:

Wind Turbine Types and Generator Control

Description

Transcript

Tags

More videos by Standards