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SMALL WIND TURBINE PMSG GENERATION SYSTEM PowerPoint PPT Presentation


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SMALL WIND TURBINE PMSG GENERATION SYSTEM. Gene Z. Guo. May 19, 2006. Sustainable Power Research Group. University of New Brunswick. Introduction. R&D of distributed power generation (DG) systems is becoming more and more popular nowadays because of

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SMALL WIND TURBINE PMSG GENERATION SYSTEM

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SMALL WIND TURBINE PMSG GENERATION SYSTEM

Gene Z. Guo

May 19, 2006

Sustainable Power Research Group

University of New Brunswick


  • Introduction

  • R&D of distributed power generation (DG) systems is becoming more and more popular nowadays because of

  • 1.     Increasing demand of electric generation

  • 2.     Various advantages of DG system, such as

  • environmental-friend, short construct period, etc.

  • 3.     and the development of related theory and technology.

  • Wind power generation systems are one of the most important R&D and application of the DG systems.

  • Direct-drive, variable frequency PMSG grid-connected wind generation system is playing an important role in the small wind power applications.


A 3kW wind power generation system is presented, the system includes

  • Whisper 175 wind turbine from Southwest windpower

  •  3kW DSP-controlled single phase grid-connected IGBT inverter

    Three key issues are studied to improve the performance

  •    Inverter current THD reduction

    Improved predictive current control algorithm is presented

  •     Inverter Noise reduction

    Improved PWM strategy is applied

  •      Maximum wind power extraction of the inverter

    Fuzzy-logic-based MPPT strategy is employed


Rotor Diameter:

15 ft. (4.5m)

Weight:

155 lbs (70kg)

Mount:

5” schedule 40 (12.7cm)

Start-up wind speed:

7.5 mph (3.4m/s)

Voltage:

0~440Vac

Rated Power:

3000 watts at 24mph (10.5m/s)

Peak Power:

3200 watts at 27mph (12m/s)

Turbine Controller:

EZ-Wire Wind & Solar Hybrid

Blades (three):

Carbon reinforced fiberglass

Kilowatt hours per month:

538 kWh/mo @12mph (5.4m/s)

Warranty:

2 Year Limited Warranty or 5 year Extended Warranty Option

Whisper 175 Wing Turbine Specifications

Southwest Windpower


PMSG

Power Converter

Grid

Single-phase Inverter

Current

Controller

VSWT

Block diagram of VSWT generation system

Improved predictive current controler

Features of inverter:

  • 3-phase input

  • single-phase output,

  • grid-connected,

  • DSP controlled

  • Voltage Source

The key to reduce current THD is to slect suitable current controller


  • Generally, the inverter current controllers can be classified as:

  • Hysteresis Current Controller

  • Simple and robust

  • Switching frequency depends on the load parameters

  • Current THD is high

  • Ramp Comparison Current Controller

  • Switching frequency is limited to that of the triangular waveform

  • Produced current harmonics are defined at a fixed frequency

  • Inherent phase and amplitude errors arise, even in the steady state

  • Predictive Current Controllers.

  • Offers potential for achieving more precise current control with minimum distortion and harmonic noise

  • Increase the computation effort and parameters dependency


Standard Predictive Control Algorithm

Single-Phase Grid-Connected Inverter Topology

Govern Eq.:

Discrete form:


Control target:

=Iload[n+1]

Therefore:

After formule manipulation


Improved Predictive Current Algorithm

Standard predictive current algorithm is of poor robustness

TD:Total delay

The sampling point is moved as shown above

Govern Eq.:


An Improved PWM Strategy for Inverter Noise Reduction

Inverter noise mainly comes from AC filter inductor, depends on the harmonic current frequency passing the inductor, furthermore, PWM carrier frequency

Noise can be reduced through control the current harmonic frequency of inductor, higher or lower than the hearable spectrum

Limited to present IGBT technology and considering of the losses and temperature rise, the switching frequency of IGBT is set as 10kHz in this project


Conventional PWM Strategy

Switching PWM Scheme


Improved PWM Strategy

Improved PWM Strategy

PWM Scheme Generation in DSP

Compared with the conventional one, the current harmonics of the new is doubled to 20kHz, prevent the hearable noise


TEST RESULTS

By splitting the pulse width in a PWM period, the switching frequency keep same: 10kHz,but the noise and current THD is significantly improved


MPPT Based on Fuzzy-logic Algorithm

  • In order to extract maximum power from the wind turbine, the Maximum Power Point Tracking (MPPT) method should be employed. In this project, a fuzzy-logic-based MPPT algorithm is presented and applied.

  • In this method, the dc-link voltage and current, Vdc and Idc, are sampled as the power feedback for the inverter controller, and the Vdc reference signal is updated in real time using a hill-climbing searching (HCS) method so as to lead the system to its optimal operation point.

  • The FLC is robust and the searching for optimal Vdc is fast and accurate.


Diode Rectifier

IGBT Inverter Bridge

L

DB

T1

T3

From Generator

240V

60Hz

Grid

C

Cdc

V

T4

T2

Idc

Vdc

MPPT

4

PWM

Vdc*

Idm

IL

FLC

HCS

CC

Power circuit of single-phase grid-connected inverter and its control block diagram


Simulation model of VSWT generation system in Matlab


Simulation results with step change in wind speed

Simulation results with random wind speed


Inverter Construction & Test Results

Power circuit schematic diagram


Start

PWM Underflow ISR Serve

Timers Synchronization

System Initialization

Input & Output Control

Start/Stop P/B

LCD Display

Main Loop

Module

Relays Control

O/P Power Control

System

Protection

Zero-crossing Detection

CAP3 ISR

Interrupt Serving

Module

ADC ISR

PWM Control

PWM Underflow ISR Serve

Timers Synchronization

Software block diagram of the inverter


ACKNOWLEDGEMENT

  • The research group wish to thank the Atlantic Innovation Fund (AIF) for its support to this research project


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