Year | 1940s | 1960s | 1976 | 2003 | 2014 |
compensators | PPFs | SVCs | APFs | HAPFs | TCLC-HAPFs |
Compensation range | Narrow | Wide | Wide | Narrow | Wide |
Harmonics compensation | Normal | Poor | Good | Good | Good |
Cost | Lowest | Low | High | Normal | Normal |
reliability | high | High | Low | Normal | Normal |
Switching loss | Low | Low | high | Normal | Normal |
Tracking performance | poor | Poor | Good | Poor | Good |