Part Number: TMS320F2812
Tool/software: Code Composer Studio
Dear all,
I chose to use SPLL_1ph_SOGI_IQ_H_, and the PI parameters of the loop filter are calculated according to the excel file given by TI's solar library.
The original SPLL_1ph_SOGI_IQ.h file is in IQ23 format, I changed to IQ18 format. I tested the change and it didn't have much impact. Phase lock sometimes works well, and sometimes the angle difference becomes obvious under the same conditions. The THD value of the laboratory grid voltage is typically between 5% and 8%.
Moreover, on the basis of obtaining the phase angle, after sinusoidal operation and multiplied by a current reference value, the grid voltage, phase angle, phase angle sine value * current can be found from the amplified waveform, and all three are not in the same phase.
How can I solve this problem?
See the procedure and waveform below.
Kindly help.
Thank You in Advance.
This is the normal situation
Obviously, it is obvious that the phase angle difference becomes larger under the same working conditions.
program：(Please visit the site to view this file)