Stabilization of the frequency and off-grid voltage

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by Dario Rossi

In cogeneration plants , due to the slow dynamics of the gas engines , may occur instability of frequency and voltage , which lead to the block of the plant , during the following conditions :
A) Loss of the network: in case of transfer of power into the grid
B ) Loss of the network: in the case of absorption of energy from the grid
C) Operation island : in case of high load variations

The system Piller UBT PCD ( Power Conditioning Device) has the function of stabilizing the frequency in cogeneration plants during these transients . The objective is achieved through the use of a rotating group Piller UNIBLOCK UBT with accumulator kinetic POWERBRIDGE from 16MJ , able to compensate for variations in power positive or negative (eg . Export or import of energy from the grid or load steps ) , carrying out the function of lung electric .
The advantages are:

- Best power quality and elimination of downtime ;
- Cede power to the grid by getting additional revenues ;
- Operate the cogeneration with the highest electrical and thermal performance .

The power of the cogenerator in part goes to the load and in part to the network, the frequency and voltage are set by the network, then the rule cogeneration power on the load, the co-generator is in parallel with the network even with power transfer to the the network. If you have the network loss what happens? You enter into a behavior-alone losing the management of voltage and frequency, Piller runs and acts as a lung power, handling and V f.

Pcog = Pc + Ptr

V, f set by the network

COG rules P and Q

Pcog = Pc + Ptr (?)

V f (?)

Case a) loss of the network with the sale of electricity to the grid:


Case b) loss of net absorption of energy from the grid:

Case c) island operation with high load variations:



source: Atti di Convegno mcTer: " Cogenerazione: Stabilizzazione della frequenza e della tensione in isola", Piller Power Systems, 27 giugno 2013.


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