Abstract
The thermoelectric generation system (TGS) has many advantages such as clean, no mechanical vibration and high reliability. When TGS is connected to the power grid, it requires that the frequency and phase are same as the power grid. It will take a number of working periods for the response time under the traditional method. A frequency and phase lock method with FIR filter will be introduced in the paper. It is based on the Capture and EPWM module of TMS320F28335. The phase lock can be carried out in one period. And the working frequency of TMS320F28335 is 150MHZ. Therefore, the speed of the whole operation is fast. The experimental results show that the method is feasible.
Highlights
Because of the advantages of high working frequency (150MHZ), fast operation speed and abundant integrated peripheral resources, TMS320F28335 is suitable for the core controller of thermoelectric generation system (TGS) which works on the grid-on mode
When TGS is connected to the power grid, it requires that the frequency and phase are same as the power grid
It is based on the Capture and EPWM module of TMS320F28335
Summary
Because of the advantages of high working frequency (150MHZ), fast operation speed and abundant integrated peripheral resources (including EPWM, CAPTURE, ADC modules), TMS320F28335 is suitable for the core controller of TGS which works on the grid-on mode. In this project, TMS320F28335 is used to quickly capture and calculate the frequency and phase value of the power grid by using the Capture module. The EPWM signal is used to drive the full bridge inverter circuit to generate sinusoidal waveform with the same frequency and phase as the power grid. The SPWM signal is used to drive the full bridge circuit to generate the AC waveform which has the same frequency and phase as the power grid. The speed of frequency and phase lock is very fast [4,5,6]
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