This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CCS/UCD3138PFCEVM-026: which PID coefficient could effect THD or eliminate sensing delay?

Part Number: UCD3138PFCEVM-026


Tool/software: Code Composer Studio

In the following codes come from PWR026_PFC, 
What does' researved'  mean?
 
Which coefficient could immediately affect THD or eliminate sensing delay?
KP? KI? OR KD_ALPHA?
 
hope for your help,sincerely.
 
#elif(PFC_TYPE == SINGLE_PHASE)//single phase PFC
 //        vout_command, vout_ov_limit,  frequency
 #define PFC_SETPOINT_DEFAULT {390,           435,    100}
 //        KP_COEF_1 KP_COEF_0
 #define FILTERKPCOEF0_DEFAULT {500,  1778}
 //        KI_COEF_1 KI_COEF_0
 #define FILTERKICOEF0_DEFAULT {100,  20}
 //        KD_COEF_1 KD_COEF_0
 #define FILTERKDCOEF0_DEFAULT {1500,  -64}

//        researved KD_ALPHA_1 researved  KD_ALPHA_0
 #define FILTERKDALPHA_DEFAULT {0,   250,   0,   201}

 //        researved NL_MODE  AFE_GAIN  SAMPLE_TRIG1_OVERSAMPLE
 #define FILTERMISC_DEFAULT  {0,   1,    1,   3}