Woodward easYgen-3000XT Series, Руководство пользователя

Страница: 744 / 1205

feed-in power to stabilize mains. Ripple control is one form of power limitation and is used
in many countries around the world.
Functionality
The energy supply company provides a signal to the ripple control receiver to reduce the
feed-in power of the generating plant. The ripple control receiver switches four relay
contacts according to the required energy power level. This relay contacts correspond for
example to the following energy power levels:
• 100% (full feed-in) - Step 1 •
• 60% - Step 2 •
• 30% - Step 3 •
• 0% (no feed-in) - Step 4 •
The respective contact is closed for the duration of the reduction.
The reduction of the feed-in power must be established within a certain time frame
(depending on national regulations).
Derating of power
The power reduction is realized by using the LogicsManager "Free derating" (parameter
╚═▷ 15146 ). This function is using an analog signal. For this reason the relay outputs of
the ripple control receiver must be converted into a corresponding analog signal. We
recommend a resistor array like shown in
╚═▷ Fig. 265 to convert the relay outputs into a
analog signal (0 to 500 Ohms).
Fig. 265: Ripple control receiver wiring
R1 = 500 Ohms (or 560 parallel 4.7 k)
R2 = 300 Ohms (or 330 parallel 3.3 k)
R3 = 150 Ohms
744 easYgen-3000XT Series B37574
6 Application Field
6.3.13 Ripple Control Receiver
Released