Method and system for controlling energy streams
a technology of energy streams and energy distribution networks, applied in the integration of power network operation systems, ac network voltage adjustment, reducing harmonics/ripples, etc., can solve problems such as affecting the quality of electricity, affecting the operation reliability, and the number of disruptions, so as to improve the control of the electricity distribution network, improve the quality of electricity locally, and improve the control over the electricity distribution network.
Active Publication Date: 2020-01-09
AHOLA JERO +1
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Benefits of technology
The invention is about a system and method for improving control over an electricity distribution network and heat distribution network. It uses an intermediate energy storage unit that can absorb and release energy through a phase transition process, resulting in a relatively high energy storage capacity. The energy storage unit can be in the form of a solid-liquid phase transition or a liquid-vapor phase transition. The system allows for frequency control in the grid, improving power quality and reducing losses in the heat distribution network. It also provides a reserve supply that is adjustable, movable, and pollution-free. The system can be distributed around a district heating network or a heat consumption site, increasing operational reliability and providing redundancy. The energy storage unit remains stable and non-polluting regardless of usage.
Problems solved by technology
The growth in production of renewable energy increases problems relating to operational reliability in the electricity distribution network, because the production of renewable energy may fluctuate greatly in time.
Smaller renewable energy production units may also raise the number of disruptions to a significant degree, which easily leads to impaired quality of electricity.
Problems in district heating are caused by transmission losses in pipelines and due to insufficient heating power at maximum loads, whereby the required additional heating power must generally be produced by means of more expensive structures and fuels that pollute the environment to a greater degree.
Method used
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[0033]The method and the system according to the invention will now be described in detail with reference to the accompanying drawings 1 and 2 representing schematic diagrams of some systems according to the invention.
[0034]In one system for controlling energy according to the invention as shown in FIG. 1, between an electricity distribution network 1 and a heat distribution network 2 there is provided a mass storage unit serving as an energy storage unit 3, which in this embodiment is a salt storage unit. The salt is preferably sodium nitrate NaNO3 or potassium nitrate KNO3 or their mixture. Thus, the energy capacity of the heat storage unit can be increased, as it is possible to apply the phase transition of the salts between a solid and a liquid state, which is known to be greatly energy absorbing or releasing.
[0035]In the system according to the invention, adjustment and control of the electricity distribution network 1 is carried out by means of suitable adjustment means 4, inc...
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The invention relates to a method and to a corresponding system for controlling energy streams in order to connect operations of an electricity distribution network (1) and a heat distribution network (2) by means of an intermediate energy storage unit (3). According to the invention, the power balance and quality of current and voltage of the electricity distribution network (1) are adjusted by supplying the losses provided by adjustment of the electricity distribution network to the energy storage unit (3) in the form of heat, and from the energy storage unit the heat is extracted to the heat distribution network (2) according to the heat requirement of the heat distribution network.
Description
FIELD OF THE INVENTION[0001]The invention relates to a method and to a system for controlling energy streams in order to connect operations of an electricity distribution network and a heat distribution network by means of an intermediate energy storage unit.BACKGROUND OF THE INVENTION[0002]In an electricity distribution network, the production and consumption of electricity must be kept constant at all times, so that the frequency and voltage of the electricity distribution network can be kept balanced. Balancing the production and consumption is made by means of automatic and operator-activated reserves. The reserves may be frequency containment reserves, frequency restoration reserves, or replacement reserves. The growth in production of renewable energy increases problems relating to operational reliability in the electricity distribution network, because the production of renewable energy may fluctuate greatly in time. Smaller renewable energy production units may also raise th...
Claims
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IPC IPC(8): F28D20/02H02J3/00H05K7/20G05B15/02F01K3/18
CPCG05B15/02H05K7/20F28D20/021F01K3/186H02J3/00F28D20/028H02J3/1842Y02B70/3225Y04S20/222H02J2310/12H02J3/14H02J3/28Y02E60/14F28D21/0001H02J3/01H02J3/12
Inventor PIISPANEN, ARI
Owner AHOLA JERO
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