Energy storage system

Energy Storage System

The invention relates to an electrical energy storage system for renewable energy sources such as photovoltaic systems, micro-wind farms or [...] , for supplying electric energy to at least one consumer, comprising at least one port for the renewable energy source, at least one network connection to an external mains supply and at least one electrical energy storage device, wherein the power source and an inverter with said at least one network connection and/or the at least one consumer with a bidirectional insulated DC/DC converter and bi-directional charger/ unloading module is connected to the at least one electrical energy storage device, and wherein the at least one consumer is connected directly to the mains connection in addition, according to the preamble of claim 1.

WO2011162722A1 a energy storage system described in the is, the different storage means for electrical energy, for which the charging currents can be controlled individually, as a function of the dynamic capacity of each storage device. The DC voltage can be simply for different AC load-configurations and/or be configured for replaceable [...] in operation. For this purpose a plurality of memory devices are isolated DC/DC converter with a DC bus connected via bi-directional. For each of the memory devices for independently determining the stream requests A control device is set up. Another aspect of this state of the art relates to an arrangement with an energy producing system, and an energy storage system, soft and is capable of delivering surplus power at higher power outputs than the power generation system receives request.

12 November 2013 14:01 No: R869

Is the purpose of the present invention, a simple fitting to existing photovoltaic systems suitable for the highest possible efficiency and economic energy storage system with indicate, in which system any types of possibly also using [...]. The system enables the efficient and low-cost integration of [...][...] Furthermore, into the mains, through existing photovoltaic plant.

The problem is solved by the features of the independent claim 1 and in the dependent claims are set forth in Figures Favorable refinements.

According to the invention is provided that a control system for the electronic activation or. Deactivation of the unregulated DC/DC converter and/or for switching preferably of the operating modes or loading. Unloading the charger/ [...] is designed, in which controlling an expiration Is implemented, upon reaching and/or exceeding of a defined power to charge the energy storage device via the DC-output of the power source by the power source. This existing photovoltaic systems can be extended with only little cost and low cost. Typical [...] -systems may simply and without the expense 5 for installation of a new or stronger inverter [...] Photovoltaic-modules and with about 1.2 5 kWh-batteries be extended. Alternatively, an inverter can be dimensioned smaller and therefore more favourable for newly erect photovoltaic systems, so that the investment costs yield use becomes higher and the lower.

Preferably, said charging/unloading apparatus is operated in such a manner that from a definable power of the energy source the difference between the actual load and power generated from the power source is fed into the energy storage device, wherein preferably a definable maximum charging power is not exceeded.

12 november 2013 14:01 i \ ir. : R869

One specially [...] be provided that the charge of the energy accumulator with [...] to at a predefinable state of charge, preferably up to a SOC of 95% is effected.

For states of the system, wherein by increasing the load or reduction of the power of the energy source a [...] no longer possible Is, preferably the charging current is reduced to a defined minimum input voltage of the charger and regulated.

According to another embodiment of the invention is activated by the energy source at the discharge of the energy store [...] a defined second power for the supply of the inverter and further of the consumer and/or the return over the network connection.

Such [...] preferably occurs at a predefinable state of charge of the energy accumulator with definable constant current unloading to the discharge, preferably up to a 25% of SOC.

In all systems described can advantageously be provided having priority that only upon reaching and/or exceeding of a defined feed-power by the power source on the network connection of the DC/DC- [...] activated and the charging process of the energy store Starting, wherein the controller is connected for interrogation of the feed-power with a feeding counter.

Advantageously, here the controller (PLC) with means for wireless data transmission or communication through the gateway [...]feeding counter connected and provided with the.

The charger/ unloading module is for the supply of any desired battery types, optionally also at the same time, up to a maximum voltage of 60V and possible feeding back the energy from the batteries 90% designed to at least.

12 november 2013 14:01 [...].: R869

One further optional feature of the invention lies therein that said bidirectional isolated DC/DC converter to a non-hazardous voltage of the voltage of the power source for the reducing 60V with an efficiency of 95% is less than higher via an external control via a Remote ON/OFF designed and can be deactivated/activated.

Advantageously between the inverter and the power source is a branch to the DC/DC converter provided.

At most one of the DC- [...] the loading/One specially unloading modules for terminals of a DC-load be designed.

The control is via a preferably digital interface to the inverter according to an embodiment of the invention and their power asks and further parameters from the power source connected.

Another embodiment provides for even before that a measuring device for the current measurement at the output of the power source is connected directly to the controller and preferably provided.

With the invented any batteries can energy storage system ([...] , Li ions, lead, [...]) are used, even with different voltages, capacities and types. The system can simply be integrated into existing types of energy production systems, as their existing inverter is used.

Additional advantages, characteristics and details of the invention result from the following description, with reference to the drawings embodiments of the invention are described in the. Heat to in the claims and in the description can in each case individually or in any combination for themselves invention-substantially be mentioned characteristics.

12 November 2013 14:02 No: R869

The List of reference numerals is part of the disclosure. Figures are contiguously and comprehensive way described. Identical reference numbers denote [...] components, reference marks having different indices indicate functionally identical or similar components.

It shows:

Fig. 1 a scheme of a conventional photovoltaic plant, and

sequence. 2 a scheme of an embodiment of a according to the invention in conjunction with a photovoltaic installation and a micro wind -Plant energy storage system.

[...] 1 shows a schematic of a simple conventional system with a photovoltaic generator 1 than [...] energy source. This 7 and a first terminal 3 via the inverter feeds 2 with electrical energy in the form of alternating current at least a consumer. Over a 5 4, however, can also in a public mains feeding payer are fed energy, energy from the electrical network can also be 5 based, to also so that consumers have to supply 2.

Fig. [...] 2 is a schematic representation of a preferred embodiment for a, on the other hand, in a power supply system with mains connection and a renewable energy source integrated energy storage system. Again [...] as an example of a photovoltaic generator is, for example, a power source 1, which also may be provided in the form of about a [...]micro wind plant or a. The supply a consumer 2 via the inverter 3 and 7 and a first terminal 4 with the public mains [...] the communication via the 5 is similar to the known system. Photovoltaic generator 1 and inverter 11 7 together form the photo volt alkene -Plant.

12 November 2013 14:02 No: R869

Integrated 12 11 is now in the photovoltaic plant according to the invention energy storage system, as is also clearly represented in Fig. 2.

Upper a controller 10, 11 and the inverter 7 the photovoltaic plant [...] 1 between the is used, typically with a software/firmware implemented Microcontroller-circuit and associated, the electronic activation is or. Deactivation of a DC/DC converter 8 and/or the switching of a load/ [...] 9 between its operating modes or loading.

Unloading accomplished. Alternatively, can, for example, via a computer program product stored in the memory of the controller 10 or by means of a hard-wired circuit of the subsequently be explained according to the invention the end Implements. With the charger/6 connected unloading module 9 Is at least an electrical energy storage device.

The 12 preferably comprises a bidirectional insulated and preferably unregulated energy storage system according to the invention (in which therefore the output voltage can be adjusted by a fixed gear ratio is and not given) DC/DC converter 8 and 9 is also designed for the bi-directional operation unloading module said charging /.

Implemented in the controller upon reaching the end is obtained by the charged and/or exceeding of a defined power by the photovoltaic generator 6 directly via the DC output of the 1 the energy store photo volt alkene generator 1. Therefore, almost every Plant for renewable energy sources with any batteries (lithium ions, lead, [...] , etc.) than stationary self-current consumption or for self-sufficient operation will be expanded to increase the energy storage device 6.

Preferably, 1.2 kW-steps is modularly in the system, so that, for example, 5 kW peak power (typical of a single family dwelling) with a photovoltaic system with a 1.2 kW Storage system and can be extended 5 kWh lead batteries, so as to double the self-current use almost.

12 november 2013 14:03 iv r. : R869

Specially renewable energy sources, the normally 50V supply voltages of less than, such as micro-wind farms or [...] , can efficiently with this system into existing photovoltaic systems ensure that they remain in the alternating current power supply 11 and 5 are integrated, as is also represented in Fig. 2. A micro wind -generator is connected between the DC/DC converter 14 with a regulator 8 and the charger/8 and thus both for the charging of the energy store unloading module 6 and for the supply of the consumer 2 and the feeding into the power supply system 5 be used.

9 can additionally and/or alternatively to said charging/ unloading module 6 also a DC-load 13 be connected for energy storage. This^{1 isolated} DC-network can be built up. therefore a-safe, so as to supply DC-consumer 13 as LED illumination, notebooks, printer, internet box , Media Server etc..

In the simple case according to the following procedure takes place The control:

Once the photovoltaic generator 1 by about 600 W average basic load -power of 1 kW, for example, the the energy store is charged on the DG output of the energy source 6 exceeds 1. Preferably, operated in such a way, the charger/ unloading module 9 that from a definable power of the energy source 1 the difference between the current and the power generated by the energy source the energy store 1 Read 6 is fed in. The charge is preferably performed with up to a defined state of charge (CCCV-Ladung) [...] ([...]) of typically 95%, and preferably also a definable maximum charging power is not exceeded.

Fall below a definable limit value or the generated power Should the energy source from the outset including lie 1, e.g., at the most 40% (e.g., at the most 400W) average basic load bring the, 6a constant current unloading Starting a predefinable lower charge state of the energy store the ([...]) of this reaches z.B. 25%

12 November 2013 14:03 No: R869

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has. The measurement values come from the inverter 11 via a digital interface or 7 the photovoltaic plant either by the controller itself can be determined, by means of the voltage drop at a estimationcurrent eating approximately over a diode or a MOSFET /-(blocking diode as ideals s) of the system. This brings the benefits that the energy storage device 6 are conserved, thus the maximum lifetime is reached and the maximum (^{s Profitability}) load conversion[...]. At bad weather days (1.6 kW [...] throughout the day at which is smaller than) is typically absolutely no charging cycle carried out

io According to a further refined variant of the invention may 6 instead of by the direct-current power of the loading of the energy accumulator 1 are controlled by the photovoltaic generator feeding achievement the photovoltaic plant 11, and this requires the presence of a compound for 4 then feeding counter , preferably via wireless or Bluetooth

fram or PLC. The discharging the 6 can then also for covering energy-storepeak load Enabling basic requirements of electric current and not just for prolonged providing the, what represents self-current use and thus another a further increase in the cost savings.

The kind of charge takes place when the PV-Plant more than 500W

20 surplus power feeds into the network. The charging the energy store (CC) as long as enough energy 6 preferably occurs again with constant current is generated by the 1 [...].

Is the load or the power generated from the power source 1 is Does to a minimum [...]unloading module at the input of the load/9

26 regulated. This all load requirements can be covered without net achievement purchase smaller than the power of the photovoltaic generator 1.

For the discharge of the energy store can be provided two modes 6. What a scheduled discharge can be provided at a specific time, e.g. two hours before sunset with a

30 basic requirements of electric current for further meet the defined current. These acts

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as an extension of the duration of sunshine for the photovoltaic plant 11, remains below a predefinable value when their power. As the efficiency of the inverter decreases at low DC input power 7, 6 from the energy accumulator is also sought a certain constant power from reasons of efficiency, e.g. mind. 700W, to discharge, even if the mean basic requirements of electric current slightly lower.

A load support can also be provided. If for example a high load requirement is detected, which is the current power of the photovoltaic generator exceeds 1 clearly and preferably also with high probability over a certain, predeterminable Tent, the probability is high when the energy store already adequately charged and 6, the energy store within a defined further time interval 6 (e.g. until sunset with photovoltaic systems 11) to be able to still full-load , then unloading module 9 is switched on the loading/on constant current-discharge. 6 the load requirement on the part of the energy accumulator is supported with a defined current By. Will less power for the load required so the inverter 7 begins by means of its maximum power (MPP)- tracker energy into the National Grid Point. From a defined (e.g. 25% of the net is [...]) Network feeding achievement Stopping the discharge. Then kind of charge -time or a further back on is seen a favourable load support (with further discharge of the energy store 6).

During unloading of the energy store provides preferably a 6. Blocking [...] therefor that no current from the energy store 1 (i.e. the interleaved solar modules) 6 back to the photovoltaic generator 11 flows the photovoltaic plant. The "blocking diode" can either in the form of a Schottky diode in order to improve the efficiency in the form of a MOSFET or be realized as a "ideals diode", must be triggered accordingly by the control of the.

12 November 2013 14:04 No: R869

The energy storage system is passively (DC/DC converter 8 and thus also charge/ unloading module[...] 9), when the energy store (e.g. 95%)has achieved the [...] 6, or the generated power of the photovoltaic generator 1 corresponds to approximately to the load requirement, so that it is not efficient to carry out a charge or supporting discharge 5, 6 the predefined minimum state of charge or but if the energy store has reached ([...]) of z.B. 25%

12 November 2013 14:04 No: R869

A659P

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Photovoltaic Generator Inverter DC-DC-Transducer Consumer First Port Network Connection Power Grid Energy Storage Device Charging/ unloading module Control

1 photovoltaic plant energy storage system DC load

Micro-Wind plant or [...]