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Battery Charging with Maximal Peak Power Tracking
Gallery spotlightMotors and generators
A maximal peak power tracking (MPPT) example for wind power plant is implemented in this example. The load is a battery that is subjected to a variable speed, realistic wind profile. The system simulated consist of the following components; a wind turbine, a planetary gear system, a generator, a load (battery) and a 3-phase bridge regulator for the generator. The example presented demonstrates the utility of an integrated design process. Comparisons are made between an FEA based machine model and an analytic approximation, a simple example of the utility of such mechatronic simulations.
METHODS and RESULTS
Wind power generator model
The model of the generator is created using the MotorSolve BLDC software. A simple 4 pole 12 slot machine has been used here. The cross section of the machine has been shown here.
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Export to VHDL-AMS format
A VHDL-AMS model of the generator is exported from motorSolve BLDC. The VHDL-AMS interface is shown here. The link allows the user to carry out load and velocity driven simulations as a multiple-input-multiple-ouput black box. Scaling relations of Maxwell's equations can help to carry out design iterations without the need for regenrating new models.
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Integration with SystemVision
A number of systems were created and studied for this example. One such system in SystemVision (from Mentor Graphics®) is shown here including an ideal DC generator in the system for comparison between the performance of an analytic and a finite element based model for this example. in the final design, the load has been replaced by a battery.
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A second system comprising of the MPPT charging system with space vector pulse width modulation for rectifying the generator is presented here. The results of simulations for this system is also shown below.
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Results
The wind speed profile, the voltage at load and the turbine speed corresponding to the test model with DC and FEA based model is presented here.
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The performance of the system with an FEA based model and an analytic DC motor is presented here.
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The duty cycle, Battery charging powers and battery state of charge are presented here. These results correspond to the system without the DC model and uses SVPWM for rectification.
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Portions of this example have been provided courtesy of Mentor Graphics ®
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