Patent ID: 7110865
Filing Date: 2006-09-19
Classification: H02J,Y02E

Abstract:
1. A method for power matching in an electricity grid, the grid comprising at least two power generating plants supplying power output into the grid, at least two power loads consuming power from the grid, at least one storage plant, at least one storage volume, at least one power generating machine for operation with an energy storage fluid which is stored in the storage volume, the power generating machine being connected to a generator which supplies electrical power during operation, at least one power consuming machine for feeding energy storage fluid into the storage volume, the power consuming machine being connected to a motor which consumes electrical power during operation, wherein, in a first operating state, an overall power supply includes the sum of the power output supplied from all the power generating plants and from the power generating machine and equals an overall power consumption that includes the sum of the power which is consumed by all the power loads and by the power consuming machine, such that the grid is in equilibrium, comprising: upon a sudden change in power demanded from the storage plant, controlling the power consumption of the power consuming machine such as to maintain the equilibrium between the overall power consumption and the overall power supply into the grid, and changing the power consumption of the power consuming machine in a direction opposite to the direction taken during controlling, with the changing in the power consumption being carried out slower than during controlling, and the changing being at least partially compensated for by changing the power output of the power generating machine, such that, when an initial rise occurs in the power demand, the power consumption of the power consuming machine is reduced, and the power output of the power generating machine is successively increased with the power consumption of the power consuming machine being increased, and when an initial drop occurs in the power demand, the power consumption of the power consuming machine is increased, and the power output of the power generating machine is successively reduced with the power consumption of the power consuming machine being reduced.