Table 5 Performance summary of PV-DSTATCOM under varying irradiance and PCC voltage condition.
Cases | PCC Voltage Status | Irradiance (W/m2) | Load THD (%) | Source/Grid THD (%) | DC Link Voltage | Source/Grid Neutral Current | Remarks |
|---|---|---|---|---|---|---|---|
Case-1 | Balanced | 0 Night-time | 13.51 | 5.58 | Stable within ± 5% | Near zero | No active power injected, harmonic mitigation achieved, THD slightly exceeds IEEE-519 limit |
Balanced | 600 | 13.51 | 4.08 | Stable within ± 5% | Near zero | Active power injected, harmonic suppression remains effective, THD within IEEE-519 limits | |
Unbalanced | 0 Night-time | 13.63 | 5.93 | Stable within ± 5% | Near zero | Higher THD due to unbalanced PCC voltage, but harmonic mitigation continues | |
Unbalanced | 600 | 13.63 | 3.95 | Stable within ± 5% | Near zero | Active power injection improves harmonic suppression, THD well within IEEE-519 standards | |
Case-2 | Balanced | 1000 | 13.51 | 4.96 | Stable within ± 5% | Near zero | Active power injected as irradiance increases, THD within IEEE-519 limits |
Unbalanced | 1000 | 13.63 | 5.17 | Stable within ± 5% | Near zero | Voltage unbalance causes slight THD increase, but overall power quality remains stable | |
Case-3 | Balanced | 700 | Before: 13.51 After: 9.40 | Before: 4.88 After: 3.03 | Stable within ± 5% | Near zero | Sudden load increase reduces THD, harmonic mitigation continues, THD stays within IEEE-519 limits |
Unbalanced | 700 | Before: 13.63 After: 9.36 | Before: 5.77 After: 4.65 | Stable within ± 5% | Near zero | Load increase reduces THD, but higher THD compared to balanced case due to voltage imbalance |
