DE102009035399A1

DE102009035399A1 - Circuit arrangement for current steering

Info

Publication number: DE102009035399A1
Application number: DE102009035399A
Authority: DE
Inventors: Martin Loeffler
Original assignee: Löffler, Martin
Priority date: 2009-07-30
Filing date: 2009-07-30
Publication date: 2011-02-03
Also published as: WO2011012272A2; WO2011012272A3

Abstract

A circuit arrangement for current control between at least one consumer-side power source (G1), an electrical supply network (11) and electrical loads (V1 to V4), all phases (L1, L2, L3) of the current sources (G1 to Gn) via controllable switch (S7 to S15) are connected to the electrical loads (V1 to V4) and via controllable switches (S1, S2, S3) and an electricity meter (Z1) to the supply network (11) and wherein the electrical loads (V1 to V4) via controllable switch (S4, S5, S6) and an electricity meter (Z2) to the supply network (11) are connected.

Description

In Germany is so far possible due to legal requirements, own Generate electricity, for example via a photovoltaic system, and the electricity generated in the public Supply network. The electricity fed in is provided by the utility company hardened and tempered. The electricity that the customer of the utility company for his electric equipment needed he still refers to the utility company.
Besides, they are known as isolated solutions, where the consumer is complete from public Network is disconnected and its needed power exclusively self generated. This happens a photovoltaic system, so the electricity generated by this, so far he is not consumed directly, cached in a battery.
by virtue of legal changes it is now being promoted by lawmakers, if customers by public Utilities that generate electricity themselves, too consume yourself. The electricity that the customer does not use can be he continues to feed into the grid. Should the self-produced Electricity is insufficient, so the customer can still electricity from the public Obtain supply network.
Of the Invention is based on the object, a circuit arrangement for Power steering to meet the new legislation wears and both self-consumption of the electricity customer itself generated Electricity as well as a feed into the public supply network allowed, with all Phases of self-generated electricity to the electrical consumers can be switched.
The Task is solved with a circuit arrangement for power steering between at least a consumer-side three-phase and / or alternating current source, in particular a photovoltaic system with inverter, an electric Supply network and electrical three-phase and / or AC consumers, which is characterized in that all phases of the at least one Three-phase and / or AC power source via controllable Switch with three-phase and / or AC consumers and via controllable switches and an electricity meter for every Phase are connected to the supply network and that the three-phase and / or AC consumers via controllable switches and a three-phase meter or an AC meter for every Phase are connected to the supply network.
The Connection between the power sources of the customer and its electrical Allows consumers a direct self-consumption of self-generated electricity The customers. If the customer has no electrical equipment in operation, so can the customer Power sources over the controllable switches are connected to the supply network and feed their electricity there. Record the planned electricity meters for each phase the amount of electricity fed into the grid.
Deliver the own power sources at the customer, however, little or no Electricity for his electrical appliances, so can these devices over the designated Switch can be connected to the utility network and from it their Electricity partially or completely Respectively. This electricity supply from the supply network is again recorded by electricity meters, so that a proper billing by the utilities carried out with the customer can be.
There the new legal regulations in Germany even a remuneration of the self-produced and self-consumed electricity for the end customer It is also intended appropriate if between the at least one three-phase and / or alternating current source and the three-phase and / or AC loads a three-phase meter or an AC meter for every Phase is arranged. It leaves thus also the self-consumed portion of self-produced Capture electricity exactly and settle it with utility.
Around the self-generated electricity of all phases the house connection and thus all electrical Available to consumers to be able to Each phase of the at least one three-phase and / or alternating current source can be controlled via a controllable Switch with each phase of the three-phase and / or AC consumers be connected.
Further it is advantageous if the circuit arrangement is a control device that with with for each phase of the at least one three-phase and / or alternating current source and each phase of the three-phase and / or AC consumers provided current measuring devices and all controllable Switches is connected. This control device can be fully automatic or also freely programmable make the desired current steering. About the Current measuring equipment can be used at any time by or Electricity generated by power sources and consumed by consumers Current can be measured accurately and accordingly the switches are operated.
Thus, with the control device between the at least one three-phase and / or AC power source and the three-phase and / or Switches may be partially or all jointly closable when AC and / or AC loads consume power and the at least one three-phase and / or AC power source provides power. For this purpose, the current intensity supplied by the current sources is compared with the current intensity of the consumers in the control device. According to the comparison result, one or more phases of the power consumers are connected by closing the corresponding switches with one or more phases of the at least one power source. At the same time can be conveniently separated by opening the associated switch a phase of the power circuit, which is connected to the customer's power sources from the public network.
Further can with the control device which between the at least one three-phase and / or alternating current source and the supply network arranged Switches are closed when the at least one three-phase and / or AC power source provides more power than the AC and / or AC consumers need. Also this closing the switch to the utility grid can only be common for individual switches or for all respectively.
Besides that is it is possible with the control device which between the supply network and the three-phase and / or AC consumers arranged switches for one or to close several phases, when the three-phase and / or AC consumers more power need, as the at least one three-phase and / or alternating current source supplies.
at a preferred embodiment Furthermore be provided that between the at least one three-phase and / or AC power source and AC and / or AC loads arranged switches are manually operated. This allows it the customer to switch off the self-consumption of self-generated electricity and to feed this completely into the net, if he so wishes.
following becomes a preferred embodiment a circuit arrangement according to the invention closer to the drawing explained.
The single figure shows a schematic diagram of a possible Embodiment of a circuit arrangement according to the invention.
It is delimited by dotted lines an internal electrical network 10 as well as a public supply network 11 shown. The public utility network has three phases L1, L2, L3 and a neutral conductor N. In the in-house power grid is a circuit arrangement 12 for current control between consumer-side current sources G1, G2, G3, G4 to Gn, the supply network 11 and electric power consumers V1, V2, V3, V4. The current source G1 is a three-phase current source, and the current sources G2 to Gn are AC sources. The individual power sources can be photovoltaic systems with inverters or even wind turbines or other generators. In the electrical consumers, the consumer V1 is a three-phase load (400 V) and the consumers V2, V3, V4 AC consumers, which are each connected to one of the phases L1, L2, L3.
The circuit arrangement 12 first creates a connection between the current sources G1 to Gn and the supply network 11 , The current sources G1 to Gn are to switch S1, S2, S3 and a counter Z1 with the phases L1, L2, L3 of the supply network 11 connected. When the switches S1, S2, S3 are closed, the power generated by the current sources G1 to Gn becomes the supply network 11 fed.
Next, the circuit arrangement 12 a connection between the supply network 11 and the consumers V1 to V4 ago. The three phases L1, L2, L3 are connected to the consumers V1, V2, V3 and V4 via a counter Z2 and switches S4, S5, S6. If the switches S4, S5 and S6 are at least partially closed, then the consumers V1, V2, V3, V4 can at least partially receive their power from the supply network 11 Respectively. The amount of the current drawn is detected by the counter Z2.
Around also a self-consumption of the generated by the current sources G1 to Gn Streams to allow through the consumers V1 to V4, are also the Phases L1, L2, L3 of the current sources G1 to Gn via switches S7 to S15 with each of the phases L1, L2, L3 of the consumers V1 to V4 connected. Furthermore is a counter Z3 provided the quantity of the on the phases L1, L2, L3 of the consumer V1 to V4 emitted self-generated current. This is also a remuneration self-generated and self-consumed electricity possible.
Next shows the circuit arrangement 12 a control device 20 which is connected to all controllable switches S1 to S15. The control device 20 is also connected to current measuring devices I1, I2, I3 in the phase lines of the current sources G1 to Gn and to current measuring devices I4, I5, I6 in the phase lines of the current consumers V1 to V4.
Show the current measuring devices I4 to I6 that the consumers V1 to V4 via at least one of the phases L1, L2, L3 require power and at the same time supply the power sources G1 to Gn at least partially and at least one of the phases L1, L2, L3 a current, so the controller 20 connect at least one of the phases L1, L2, L3 of the current sources G1 to Gn with at least one of the phases L1, L2, L3 of the power consumers V1 to V4 by closing the corresponding switches S7 to S15. At the same time, the control device 20 that phase L1, L2, L3, which receives its current from the current sources G1 to Gn, decouple by opening the associated switch S4 to S6 from the public network. Also, those phases L1, L2, L3 of the current sources G1 to Gn, which supply their current to the consumers V1 to V4, are opened by opening the associated switches S1 to S3 from the public grid 11 disconnected so that these phases deliver their power completely to the consumers V1 to V4 and not into the grid 11 feed.
What is produced by the power sources G1 to Gn on excess electricity will continue to be in the public grid 11 fed. If the power generated by the current sources G1 to Gn is insufficient to supply the consumers V1 to V4, then part of the required current can be obtained by closing the corresponding switches S4, S5, S6 from the public grid 11 be obtained.
The power steering can be done fully automatically depending on the required power and the amount of self-generated electricity. In addition, it can be provided that the switches S7 to S15 can be opened at least manually if the self-generated current of the current sources G1 to Gn is to be completely fed into the network. In this mode, of course, then all switches S4 to S6 are closed, so that the current required by the consumers V1 to V4 from the public network 11 can be obtained.

Claims

Circuit arrangement for current control between at least one consumer-side three-phase and / or alternating current source (G1 to Gn), in particular a photovoltaic system with an inverter, an electrical supply network ( 11 ) and electrical three-phase and / or AC consumers (V1 to V4), characterized in that all phases (L1, L2, L3) of the at least one three-phase and / or alternating current source (G1 to Gn) via controllable switch (S7 to S15) with the three-phase and / or AC consumers (V1 to V4) and via controllable switches (S1, S2, S3) and a three-phase counter or an alternating current counter (Z1) for each phase (L1, L2, L3) with the supply network ( 11 ) and that the three-phase and / or AC consumers (V1 to V4) via controllable switches (S4, S5, S6) and a three-phase meter or an AC meter (Z2) for each phase with the supply network ( 11 ) are connected.
Circuit arrangement according to Claim 1, characterized that between the at least one three-phase and / or alternating current source (G1 to Gn) and the three-phase and / or AC consumers (V1 to V4) a three-phase meter or an AC meter (Z3) for each phase (L1, L2, L3) is arranged.
Circuit arrangement according to claim 1 or 2, characterized characterized in that each phase (L1, L2, L3) of the at least one Three-phase and / or AC power source (G1 to Gn) via a controllable switch (S7 to S15) with each phase (L1, L2, L3) the three-phase and / or AC consumers (V1 to V4) connected is.
Circuit arrangement according to one of the preceding claims, characterized in that it comprises a control device ( 12 ) having, for each phase (L1, L2, L3) of the at least one three-phase and / or alternating current source (G1 to Gn) and each phase (L1, L2, L3) of the three-phase and / or AC consumers (V1 to V4 ) provided current measuring devices (I1 to I6) and all controllable switches (S1 to S15) is connected.
Circuit arrangement according to claim 4, characterized in that with the control device ( 12 ) some or all of the at least one three-phase and / or AC power source (G1 to Gn) and the three-phase and / or AC consumers (V1 to V4) arranged switches (S7 to S15) are closable when the three-phase and / or AC consumers (V1 to V4) consume power and the at least one three-phase and / or AC power source (G1 to Gn) provides power.
Circuit arrangement according to Claim 4 or 5, characterized in that with the control device ( 12 ) between the at least one three-phase and / or alternating current source (G1 to Gn) and the supply network ( 11 ) arranged switches (S1, S2, S3) for one or more phases (L1, L2, L3) are closable when the at least one three-phase and / or alternating current source (G1 to Gn) provides more power than the three-phase and / or or AC consumers (V1 to V4) need.
Circuit arrangement according to one of claims 4 to 6, characterized in that with the control device ( 12 ) between the supply network ( 11 ) and the three-phase and / or Wech Selstromverbrauchern (V1 to V4) arranged switches (S4, S5, S6) for one or more phases (L1, L2, L3) are closable when the three-phase and / or AC consumers (V1 to V4) require more power than the at least a three-phase and / or alternating current source (G1 to Gn) supplies.
Circuit arrangement according to one of claims 3 to 7, characterized in that between the at least one Three-phase and / or AC power source (G1 to Gn) and the three-phase and / or AC consumers (V1 to V4) arranged switch (S7 to S15) are manually operable.