Introduction Three-Phase Diode Rectifier

Boost Converter Controller

The purpose of this project is to design and implement a wind energy power conversion system. The system will convert the mechanical energy from a wind turbine into electrical energy on a 1kW small scale system.

This system consists of a three-phase generator, followed by a three-phase diode rectifier, connected to a two-channel interleaved boost converter, and finally a single phase inverter system. The boost converter and inverter controllers are realized with a Texas Instruments 32-bit fixed point TMS320F2812 Digital Signal Processor board.

Grid-tie Inverter

Permanent Magnet Generator

Wind Energy Conversion SystemAndrew Brown, Ali Gokal, Basheer Qattum

Advisors: Dr. Woonki Na, Dr. Brian Huggins

Anaheim Automation BLZ363SMax speed 3600 RPMVoltage 160 VPower 750 W

Boost Converter

A rectifier is an electrical device that converts AC into DC.

Frequency RPM3-phase-to-

neutral DC 5 Hz 150 2.4 V 4.3 V

20 Hz 600 19.5 V 18.4 V40 Hz 1200 40.5 V 38 V60 Hz 1800 61 V 57 V80 Hz 2400 82 V 76 V

100 Hz 3000 87 V 87 V120 Hz 3600 104 V 103 V

V = I*R Vo=(1.35Vin – VDiode)P = I*V Value of capacitor to ensure clear signalC=(Vp/2*f*Vr) =534μF Therefore we used 1.5mF

Output of generator after 3phase diode rectifier without capacitor filter

Output of DC generator after 3phase diode rectifier w/1.5mF Cap

V Input Duty-Cycle

Freq(Hz)

Vout-exp

Vout-actual

5 V 20% 30K 6.25 V 7.5 V5 V 40% 30K 8.33 V 9.01 V5 V 60% 30K 12.5 V 12.5 V5 V 80% 30K 25.0 V 24.25 V

Vo=Vin/(1-D), or for more accurate values, Vo= {[(Vin-VIGBT*D)/(1-D)] – VDiode}

The boost converter takes in the rectified DC voltage from the three-phase rectifier and amplifies voltage. The boost converters is controlled by a DSP board which will handle the switching of the IGBT.

A single phase grid-tie inverter (GTI) is a unique type of inverter that converts DC into AC in which the output is fed into an existing electrical grid.

1=(s)G(s)G ips sk+sk

=(s)G ipi

d

oLps sL

V=(s)(s)d(s)i=(s)G ~~

In this system, maximum power point tracking (MPPT) controller was used in order to output maximum power regardless of the input conditions.

DSP MATLAB Simulink for Controller

MPPT Algorithm Flowchart

Conclusion

PSIM Model of Overall System

Wind Distribution Across the US

Top-level System Diagram

Actual DC Motor in lab

Actual Boost Converter lab

PSIM Model of Boost Converters

Actual Rectifier in labPSIM Model of RectifierPSIM Model of Inverter Actual Inverter in lab

Using small signal model of the system the voltage and current controller for the system can be easily designed. The proposed controllers, the generator, the boost converter, and inverter are successfully implemented in a small scale 1kW permanent magnet generator based wind energy conversion system with DSP.

System Diagram of the MPPT Controller

Table 1.2 Boost Converter Data

Inductor Current of Interleaved Boost Converter

Table 1.1 Brushless DC Data with Rectifier

Brushless DC Data with Rectifier

PSIM Simulation of Inverter