DE202009008618U1 - Mechanical energy storage system for the selective absorption and re-emission of electrical energy - Google Patents

Abstract

mechanical energy storage system for targeted recording and delivery of excess or missing electrical energy. characterized in that electrical energy is converted by an electric motor (3) into a rotational movement, which is driven by this rotational movement a winch (4), which by means of a steel cable (6) a weight (7) in a shaft (8) hangs can pull up. The stored energy can be converted back into electrical energy and fed into the network by lowering the weight (7), which then with the help of the steel cable (6) the wind (4) in rotation, which drives a generator (5).

Description

A Inventive energy storage system takes electrical energy from overvoltages in the Power supply and gives it in the event of an undervoltage short term and for a certain period of time again and is particularly suitable for the so-called Primary control power.

By the different energy generation systems integrated in today's power grid and the trend towards smaller, decentralized networks all the way to so-called isolated solutions there is an increase in power fluctuations in the supply network. Especially the regenerative energy sources how sun and wind can can not be calculated exactly.

In The result is short-term under- or over-coverage, power fluctuations and in the worst case power outages in whole regions.

electrical Energy must go to same time they are consumed.

Around predictable power fluctuations at about the daytime and nighttime For example, conventional power plants are used to compensate Produce more or less electricity at the time of day.

Moreover can Pumped storage plants larger energy surplus quantities record and at peak times feed back into the grid.

in this connection will with excess energy, water pumped into an upper basin and flows through a turbine if necessary back down, the recaptured Energy can then be fed back into the grid.

Currently is also working on so-called compressed air storage systems, the excess energy in the form of compressed air in underground caverns store around at elevated Energy requirement to be able to drive turbines.

These Techniques can Although they compensate for predictable power fluctuations, they do require it a certain lead time for their power to the required amounts of electricity adapt.

short-term Fluctuations such as those caused by strong gusts or brief lulls wind turbines or an unpredictable defect, can difficult to meet.

Around for such Jump in cases So it must be power plant performance be kept. The power plant capacity running in standby mode today becomes predominant by conventional energy sources such as coal, gas or nuclear energy.

Of the in the spirit of climate change, more and more advanced expansion of alternative Energies and the exit from atomic energy z. In Germany, makes new, safe and environmentally friendly solutions necessary.

Of the in claim 1 protection invention, the problem is too Basically an environmentally friendly and secure energy storage option too They allow excess energy to escape to take the net in case of need in a few seconds the required power build and use this for to keep a defined period of time (eg 15 minutes).

this Process is called primary control power.

Important Here, in particular, the reliability and longevity of such energy storage.

This Problem is solved with the features listed in the protection claim 1.

With the invention is achieved that short-term over- or undervoltages in Power grid can be safely and quickly caught and the excess or lack of energy over a certain period of time in a certain amount or can be delivered until the network security restored or other power plants are up. So it can be the Lower standby mode of power plant control and z. B. in the composite with pumped storage power plants for safe clean and reliable network stability to care.

By The resulting lower standby mode for power plant performance is So also less Kraftwerkskapzität needed, or existing power plants can be better utilized, since they no longer reserves for possibly. needed Primary control power have to hold can These power plants are exploited to the optimum power limit, which the efficiency can be optimized. The "lost" by the conversion process in the mechanical energy store Energy is more than compensated for in advance.

It So will less power plant capacity and less fossil fuels needed.

The special requirements for a sol Energy storage, seconds clause delivery of a precisely controllable power, absorption of excess energy from the network, absolute reliability, low maintenance and personnel costs, and a lifetime of 50 years and more, without sacrificing performance, are optimally solved by the invention. The same energy storage but can also z. B. in the field of railway use.

Namely um To store braking energy while holding a train and this energy for the increased energy requirement when starting up and accelerating electric trains again supply.

An embodiment will be described with reference to 1 explained.

Through an energy source 1 generated excess electrical energy is supplied via a supply line ( 2 ) to an electric motor ( 3 ) this converts the energy into a rotary motion and gives it to a winch ( 4 ) which further with the help of a steel cable ( 6 ) a weight ( 7 ) in a shaft ( 8th ) pulls up.

By This process converts electrical energy into mechanical energy and stored.

To get the energy, a generator ( 5 ) to the winds ( 3 ), the electric motor ( 3 ) is disengaged at the same time.

The weight ( 7 ) which is still at the top of the shaft ( 8th ) is now unlocked by the subsequent downward movement of the weight ( 8th ) drives through the steel cable ( 6 ) with the weight ( 7 ) connected winds ( 4 ) by the resulting rotational movement a generator ( 5 ), this converts the rotary motion into electrical energy, this is then via the mains to the consumer ( 10 ). The process can be repeated as often as desired without the performance of the system wears off.

The maximum lift heights and drop depths of the weight ( 7 ) can be controlled in such a way that constantly enough reserves for short-term recording or release of energy are available.

Claims (8)

mechanical energy storage system for targeted recording and delivery of excess or missing electrical energy. characterized in that electrical energy by an electric motor ( 3 ) is converted into a rotational movement, which by this rotational movement a winch ( 4 ), which by means of a steel cable ( 6 ) a weight ( 7 ) in a shaft ( 8th ) hangs up. The stored energy can be reduced by lowering the weight ( 7 ), which then with the help of the steel cable ( 6 ) the winds ( 4 ), which is a generator ( 5 ), be converted back into electrical energy and fed into the grid. Mechanical energy storage system according to claim 1, characterized in that the weight ( 7 ) if it is in the upper part of the shaft ( 8th ) can be drained. Mechanical energy storage installation according to one of the preceding claims, characterized in that the winds ( 4 ) via a steel cable ( 6 ) with the weight ( 7 ), when lowering the weight ( 7 ) is set in a rotary motion. Energy storage system according to one of the preceding claims, characterized in that by the rotational movement of the winch ( 4 ) a power generator ( 5 ) is driven. Energy store according to one of the preceding claims, characterized in that by pulling up the weight ( 7 ) by means of an electric motor ( 3 ), electrical energy can be converted into mechanical energy and stored. Energy storage installation according to one of the preceding claims, characterized in that the generator ( 5 ) the regenerated electrical power to the power grid ( 9 ). Energy storage installation according to one of the preceding claims, characterized in that electrical energy with the aid of the abovementioned components is converted into mechanical energy in the manner described (pulling up of the weight ( 7 )) and in the reverse manner can be converted back into electrical energy (lowering the weight ( 7 )) and thus both positive and negative electrical energy stored and targeted can be given back to ensure optimum network stability. Energy storage system according to one of the preceding claims, characterized characterized in that by means of electronic control, the male or female amount of energy to be delivered as well as the time and duration exactly are adjustable.