DESIGN OF WIND TURBINE SYSTEM

Mr. Pavan B.BhujbaleB. Tech Electrical

Fundamentals of Wind Generators

Design Wind Turbine and Generator

Outline:-

INTRODUCTION

In recent years, the electrical power generation from renewable energy sources, such as wind, is increasingly attracting interest because of environmental problem and shortage of traditional energy source in the near future.

The wind power mainly depends upon geographic and weather condition and varies time to time. It is necessary to construct a system that can generate maximum power for all operating conditions .

o Types of Wind Turbineso Horizontal Axis

Designo Vertical Axis Design

WIND TURBINE

Recently, permanent magnet alternator is used for wind power generating system because of its advantages such as better reliability, lower maintenance and more efficient.

Wind turbine:

The wind turbine is playing a cardinal role in the entire system as it is responsible for the generation of mechanical power needed to drive the generator.The primary factors on which the wind turbine performance depend are:

Wind speed.Direction of wind.Blade size.Pitch angle.Mechanical gears involved in its design.

Mathematical model of wind turbine The wind turbine can be represented in terms of a mathematical equation, which governs its generated power.

Pm=mechanical output power of the turbineCp=Power coefficient or aerodynamic efficiency. A= Swept area. V= Wind speed. ρ = Air density. β = Blade pitch angle. λ = Tip speed ratio of the rotor blade tip speed to wind speed.

Wind turbine extracts portion of wind turbine and converts it into mechanical Power.

It has three inputs Generator Speed Blade Pitch Angle Wind speed. One Output Torque

Modeling of Wind Turbine.

The system used a high efficiency low speed permanentmagnet synchronous generator .where gear box has beeneliminated. In low-speed permanent magnet alternator, therotor rotates at the same speed as the rotor of the turbine.The PMA is connected directly to the wind turbine, which Results in a simple mechanical system.

Wind Turbine Generator Design

Permanent magnet

synchronous

generator

Rectifier Boost Converter Inverter Wind

Turbine

Wind Turbines Generation System

The system is composed of a permanent magnet alternator, rectifier, dc-dc converter and inverter . The voltage generated by the permanent magnet machine is rectified using a three-phase passive rectifier, which converts the AC voltage generated by the PMA to a DC voltage. The DC output voltage is boosted to a higher dc voltage. This dc voltage is then converted to ac voltage using a pulse width modulated (PWM) inverter which is connected to the grid.

Rectifier and boost Converter.

For controlling the Ac output to a constant magnitude and frequency .

Convert the AC (Variable Frequency and Voltage) from generator to a DC using Rectifier.

The boost converter then converts the DC rectified value into a constant DC value .

Finally the inverter is used to convert the constant dc Voltage into Ac with Constant frequency and Voltage Magnitude

Inverter

Operation at variable rotor speed while the amplitude and frequency of the generated voltages remain constant.

Optimization of the amount of power generated as a function of the wind available up to the nominal output power of the wind turbine generator.

Virtual elimination of sudden variations in the rotor torque and generator output power.

Generation of electrical power at lower wind speeds.Control of the power factor (e.g. in order to maintain the power factor

at unity).Complicated.Maintenance .

ADVANTAGES AND DISADVANTAGES

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