Research Article
An Improved Phase-Locked-Loop Control with Alternative Damping Factors for VSC Connected to Weak AC System
Table 1
Parameters of VSC connected to weak AC system.
| | Parameter symbols | Value |
| Main circuit parameters | Equivalent AC source voltage | 1.0 pu, 50 Hz | Equivalent impedance of AC system
| 0.547 + 0.048 pu, impedance angle 85° | Equivalent AC system SCR | 1.83 | Rated DC power rating | 1.0 pu | PCC voltage | 1.0 pu | Converter impedance
| 0.003 + 0.15 pu | Capacitor | 0.15 pu |
| Controller parameters | Power controller gains (, ) | (0.5, 50) | AC voltage controller gains (, ) | (0.35, 30) | Inner controller gains (, ) | (1, 10) | Inner controller gains (, ) | (1, 10) | PLL gains (, ) | (50, 10) |
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