May 2008
Intermediate to advanced
340 pages
9h 41m
English
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8.5 ENERGY STORAGE
When (renewable) DG comprises a substantial part of the power production, energy storage can give us an extra and valuable degree of freedom for the operation and control of the system and is sometimes even indispensable. In a traditional vertical power system, the inertia of the rotors of the synchronous generators cover a possible mismatch between power production and consumption. In a horizontal power system, with a relatively small amount of centralized generation and a considerable contribution of (renewable) DG, the total inertia of the rotating mass in the system is strongly reduced. This is because of the lower inertia of the DG units and/or because generators are separated from the grid by power-electronic interfaces. In consequence, the total inertia in the system may become insufficient to compensate adequately for disturbances of the power balance, resulting in relatively large frequency deviations and in a dynamically less stable system in case of system disturbances and faults. Energy storage can help to compensate for this and help to maintain the power balance; energy can be stored when there is a surplus of energy, and subsequently it can be delivered in the case of a temporary deficiency. Energy storage can also be of help to level out large power fluctuations when the power is generated by renewable energy sources.
Figure 8.2 Power-electronic ...
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