Reactive-power control apparatus and reactive-power compensator using the same
US7688043B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 2007 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Aug 4, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E40/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a conventional reactive-power compensator using a static reactive-power compensator (SVC), there are many cases in which the SVC is operating in a state in which it generates an amount of reactive power equivalent to a large part of its capacity. When an unforeseen large voltage fluctuation occurs in this state, the SVC can not sufficiently generate the amount of reactive power required to mitigate the voltage fluctuation. In some cases, such a voltage fluctuation can not be brought under control. To address this situation, a reactive-power compensator utilizes a reactive-power control apparatus that includes a comparison voltage generator for generating, for a control target voltage and to mitigate voltage fluctuation, a comparison voltage restricted within predetermined limits and obeying a predetermined time-lag characteristic. A differential voltage generator generates a differential voltage that is the difference between the comparison voltage and the control target voltage. A reactive-power control device controls, in response to the differential voltage, control-target reactive power generated by an SVC, at a time-related characteristic faster than the time-lag characteri…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.