DE102018215777B4 - Control / regulating module for a control / regulating system for a power grid - Google Patents

Abstract

Control / regulating module (5) for a modular control / regulating system for a power network with an alternating voltage module (2) with an alternating current network (10), with a direct voltage module (3) with a direct voltage supplier (27) and a direct current network (11), and with an energy storage module (4) with at least one battery cell (44), - wherein the control / regulating module (5) can be brought into signal connection with a charger (7) and an inverter (16) of the AC voltage module (2) and with at least one DC voltage Power supply unit (33, 34) and a direct current mains regulating device (30) of the direct voltage module (3), - the control / regulating module (5) being designed for supply and demand-dependent specification - an alternating voltage recharging via the charger (7), - a conversion of direct current into alternating current via the inverter (16), - a conversion of mains direct voltage into supply direct voltage via the at least one direct voltage power supply unit (33, 34), - - a DC voltage charge of the battery cell (44) from the DC voltage supplier (27) via the DC network control device (30), - several energy storage levels (56 to 62) being stored in a data memory (55) of the control / regulating module (5) which characterize a relative fill level of the energy store (43), - the control / regulating module (5) being designed so that - when the energy store (43) is charged to a maximum energy store level (56), the energy store is disconnected (43) from the DC voltage supplier (27) and / or from the charging power supply (7), - when charging the energy store (43) beyond an unconditional operating energy store level (58), all consumers (37, 38) of the DC voltage module (3) with the DC voltage network (11) and all consumers (18 to 21) of the AC voltage module (2) with the AC voltage network (10), Energy storage icher level (58) lower conditional operating energy storage level (59 to 61) a disconnection of consumers of the direct voltage module (37, 38) from the direct voltage network (11) and / or of consumers (18 to 21) of the alternating voltage module (2) takes place from the alternating current network (10) according to a priority specification stored in the data memory (55), - if the energy storage device (43) falls below a minimum energy storage level (62), an emergency disconnection of the energy storage device (43) from the power network (10, 11) he follows.

Description

The invention relates to a control / regulating module for a control / regulating system for a power network.

A control system for a power grid is known from US Pat US2010 / 0076615A1 and from the DE102015206510A1 . the EP1683681B1 describes a system and a method for regulating power in a motor vehicle electrical system. The use of a fuel cell as a DC voltage supplier in a power grid is known from DE102013220300 A1 and from the DE102013209396 A1 . the US 2011/0 291 479 A1 discloses an energy storage system and a control method therefor. the US 2018/0 197 254 A1 discloses an off-grid energy supply system and operating methods therefor. the US 2017/0 288 413 A1 discloses a power supply system with a battery control depending on preferred battery levels. the US 2014/0 139 188 A1 discloses a battery management system. the US 2011/0 148 360 A1 discloses an energy storage system and a control method therefor. the US 2011/0 125 336 A1 discloses a monitoring system for a power supply system utilizing various sources of renewable energy.

It is an object of the present invention to develop a control / regulating module of the type mentioned at the outset in such a way that the capacity of an energy store is used flexibly depending on its state of charge and adapted to its capacity.

This object is achieved according to the invention by a control / regulating module with the features specified in claim 1.

According to the invention, it was recognized that the specification of different energy storage levels, depending on which certain charging / discharging situations are specified with the aid of the control module, can advantageously be adapted to situations that are supply-dependent and consumption-dependent within the control system. Depending on the design of the control / regulating module, the direct current network regulating device can be integrated into the control / regulating module. A photovoltaic system and / or, for example, a fuel cell can be used as a DC voltage supplier. The control / regulating module can also be used in a control / regulating system that is not constructed in modules.

Different conditional operating energy storage levels according to claim 2 with corresponding prioritization of the loads that are connected to the system, enable particularly flexible use of the energy storage.

An energy consumption maximizing energy storage level according to claim 3 enables predictive operation of all connected consumers in situations in which a lot of energy can be provided from the energy storage, which can be designed in such a way that later periods of time with lower supply capacity via the energy storage can be bridged. For example, external batteries of the consumers can then be charged or cooling units can be cooled down to below a normal temperature.

Maintaining connection states according to claim 4 and separating connection states according to claim 5 can take place depending on the energy storage levels with a hysteresis, so that undesired fluctuations in the operating states in the event that the charging capacity of the energy storage device fluctuates around one of the levels is avoided is.

The advantages of a consumption control component according to claim 6 correspond to those which have already been explained above with reference to the control / regulating module.

The advantages of an operating method according to claim 7 correspond to those which have already been explained above with reference to the control system and the consumption control component. The method can also be used to operate a non-modular control system.

• 1 in einer schematischen Blockdarstellung ein modulares Steuer/Regelsystem für ein Stromnetz einschließlich eines Steuer/Regelmoduls;
• 2 einer eine Mehrzahl von Batteriezellen aufweisenden Energiespeicher eines Energiespeichermoduls des Steuer/Regelsystems nach 1, wobei verschiedene Energiespeicher-Niveaus, die Steueraktivitäten des Steuer/Regelmoduls auslösen, skaliert dargestellt sind; und
• 3 ein Anschlussschema eines elektronischen Bauelements des Steuer/Regelmoduls, wobei das Bauelement als Verbraucherbaustein ausgeführt ist.

An exemplary embodiment for the invention is explained in more detail below with reference to the drawing. In this show:

• 1 a schematic block diagram of a modular control / regulating system for a power grid including a control / regulating module;
• 2 an energy store having a plurality of battery cells of an energy storage module of the control / regulating system 1 , wherein different energy storage levels that trigger control activities of the control / regulating module are shown scaled; and
• 3 a connection diagram of an electronic component of the control / regulating module, wherein the component is designed as a consumer module.

A modular control system 1 for a power grid is divided into several module levels and comprises an AC voltage module 2 , a DC voltage module 3 , an energy storage module 4th , a control module 5 and a network module 6th . The modules 2 until 6th can be in separate Components can be housed, for example in different control cabinets. A separation between the modules 2 until 6th is in the 1 indicated by dashed lines.

The AC voltage module contains a charger 7th , via which on request from a control / regulating unit 8th of the control module 5 (compare signal connection 9 ) Electricity from a public AC voltage network 10 rectified in a DC voltage network 11 of the DC voltage module 3 can be loaded. The charger 7th stands over a smart meter 12th with an infeed node 13th of the alternating voltage network 10 in line connection. Via the smart meter 12th a price for the alternating current that can be recharged via the charger can be called up. Via a gateway 14th and a signal connection 15th is the smart meter 12th with the control / regulation unit 8th of the control module 5 in connection.

The AC voltage module 2 still has an inverter 16 , via which on request from the control module 5 (compare signal connection 17th ) Direct current from the direct voltage network 11 of the DC voltage module 3 in alternating current for alternating current consumers 18th , 19th , 20th , 21 is converted. The inverter 16 thus connects the DC voltage network 11 with an alternating voltage supply network 22nd of the AC voltage module 2 for the AC consumers 18th until 21 .

The AC voltage supply network 22nd of the AC voltage module 2 has a network isolation device 23 for personal and system protection on the AC voltage supply network 22nd connected network components, i.e. the AC consumers 18th until 21 on. The mains isolation device contains accordingly 23 a leakage current monitoring unit 24 and a circuit breaker 25th .

With AC consumers 18th it can be a network component, a data processing device, for example a computer, a control unit, a server and / or a telephone system. With AC consumers 19th it can be consumers who are connected to the AC voltage supply network via household sockets 22nd are connected. With AC consumers 20th it can be an AC lighting system. With AC consumers 21 it can be a charging point or charging station for an electric vehicle. The alternating current consumer 18th can be designed for a maximum power consumption of 0.1 kW. The alternating current consumer 19th can be designed for a maximum power consumption of 0.9 kW. The alternating current consumer 20th can be designed for a maximum power consumption of 3.2 kW. The alternating current consumer 21 can be designed for a maximum power consumption of 3.7 kW. The power consumption indicators for the AC consumers 18th until 21 can be in the range between 0.05 kW and 500 kW.

The AC consumers 18th until 21 each have a switch 26th on, via which this is connected to the AC voltage supply network 22nd can be connected or disconnected from it. These switches 26th can use the signal connection 17th from the control unit 8th of the control module 5 be operated.

Part of the DC voltage module 3 is a DC voltage supplier 27 . This can be a photovoltaic system. A fuel cell is also used as a DC voltage supplier 27 possible. Via direct current lines 28 , 29 stands the DC voltage supplier 27 with a direct current network control device 30th of the DC voltage module 3 in line connection. The DC power lines 28 , 29 lead to two input ports 31 , 32 the DC power supply system 30th . The direct current network regulator 30th stands in turn with the DC voltage network 11 in line connection.

To the DC voltage module 3 continue to belong to DC power supplies 33 , 34 , via which on request from the control module 5 (Signal connections 35 , 36 ) a higher direct voltage of the direct current network 11 into a lower DC supply voltage for DC consumers 37 , 38 is converted.

The DC voltage network 11 can be operated with a DC voltage of 380 volts.

The lower DC supply voltage can be 48 V.

With direct current consumers 37 it can be a network component, a data processing device, for example a computer, a control / regulating unit, a server and / or a telephone system. With direct current consumers 38 it can be a DC workshop lighting.

The direct current consumer 37 can be designed for a power consumption of 0.35 kW. The direct current consumer 38 can be designed for a power consumption of 2 kW. Performance indicators of direct current consumers 37 , 38 can in turn lie in a range between 0.05 kW and 25 kW, with a direct current consumer also being designed for a higher power consumption. Consumers can too E.g. DC / DC charger for e-mobility directly or via the direct current network control device 30th to the DC voltage network 11 be connected.

In the direct voltage network 11 is on the one hand directly after the charger 7th and on the other hand directly in front of the connection of the direct current network control device 30th one circuit breaker each 39 , 40 a network isolation device 41 for the DC voltage network 11 arranged. The network isolation device 41 in turn has a current / leakage current monitoring unit 42 , by means of errors in the DC voltage network 11 can be recorded and personal and system protection is ensured.

The energy storage module 4th of the control system 1 contains an energy store 43 with a plurality of battery cells 44 . The battery can have a capacity that is greater than 15 kWh and that can be up to 1 MWh or even greater. About the energy storage 43 a maximum line extraction can take place, which can be greater than 15 kW and which can be in the range of 20 kW, for example.

If the DC voltage supplier 27 is designed as a photovoltaic system, this can have a peak power of more than 5 kW, for example a peak power in the range of 8 or 9 kW, 10 kW or even a higher peak power up to 500 kW or even higher.

The energy storage 43 stands over a direct current line 44a with three input ports connected in parallel 45 , 46 , 47 the DC power supply system 30th in line connection. Via these ports 45 until 47 the DC power supply system 30th is the energy store 30th with the DC voltage network 11 tied together.

Via another signal connection 48 is the control unit 8th with the direct current network control device 30th tied together.

• - Einer Wechselspannungs-Nachladung über das Ladenetzteil 7;
• - Einer Umwandlung von Gleichstrom in Wechselstrom über den Wechselrichter 16;
• - Einer Umwandlung von Netz-Gleichspannung in Versorgungs-Gleichspannung über das mindestens eine Gleichspannungs-Netzteil 33, 34 sowie
• - Einer Gleichspannungs-Ladung des Energiespeichers 43 aus dem Gleichspannungsversorger 27 über die Gleichstrom-Netzregeleinrichtung 30.

The control / regulation unit 8th of the control module 5 serves for the supply and demand-dependent specification:

• - An alternating voltage recharge via the charger 7th ;
• - A conversion of direct current into alternating current via the inverter 16 ;
• - A conversion of mains direct voltage into supply direct voltage via the at least one direct voltage power supply unit 33 , 34 as
• - A direct voltage charge of the energy store 43 from the DC voltage supplier 27 via the direct current network control device 30th .

The control / regulating unit is available via a data interface 8th with the Internet 49 for calling up information relevant to basic supply needs for the control system 1 in signal connection. The data interface contains a data connection 50 , which can be implemented as a VPN (Virtual Personal Network), the control / regulating unit 8th with a server 51 as well as another data connection 52 , which can be implemented as a WAN (Wide Area Network), of the server 51 with the Internet 49 . The server 51 and the data connections 50 , 52 belong to the network module 6th of the control system 1 .

The server 51 can also be used as a hardware firewall to protect the control unit 8th serve or be equipped with an additional hardware firewall.

The control module 5 also includes a local weather station 53 that have a data connection 54 with the control / regulation unit 8th connected is.
With the control system 1 is taken into account that the DC voltage supplier 27 as the main energy supplier is not always available. The control system 1 refers to the consumers in its control algorithm 18th until 21 , 37 and 38 , the possibility of feeding in via the public AC voltage network 10 as well as the available capacity of the energy store 43 a.

When managing the energy storage 43 a cost optimization takes place. Electricity costs for recharging via the AC voltage network 10 become with storage costs in the energy storage 43 compared. In normal operation, recharging takes place via the charger 7th a fill level of the energy store 43 kept constant. Via the control / regulation unit 8th is made by evaluating weather data, on the one hand taking data from the Internet 49 via the network module 6th and different from data from the local weather station 53 are evaluated, an energy input from the DC voltage supplier, which is then designed as a photovoltaic system 27 estimated for a future period of time that is manageable in terms of weather data. The smart meter is used at regular intervals 12th a current electricity tariff can be called up via the feed-in node 13th and the charger 7th can be reloaded. If necessary, offers are also obtained from electricity suppliers at regular intervals, for example daily. As far as feed-in electricity is offered cheaply and the weather forecast and the level of energy storage 43 indicate this, the energy storage device is recharged 43 above the charger 7th , the DC voltage network 11 , the DC power supply system 30th and the DC line 44 . As soon as it is cheaper based on the costs and forecast data collected, energy from the energy storage device 43 can be seen, the recharging is carried out via the charger 7th switched off and a current is drawn from the energy store 43 or directly from the DC voltage supplier 27 .

In a data store 55 the control unit 8th of the control module 5 several energy storage levels are stored, which indicate a relative fill level of the energy storage 43 characterize. These energy storage levels are based on the 2 explained.

A highest of these levels is a maximum energy storage level 56 , which is a 100% charge of the energy storage 43 is equivalent to. To the energy storage 43 to conserve this maximum energy storage level 56 be lower than a chemically or physically maximum possible full charge state of the energy store 43 .

The control / regulation unit 8th is designed so that when charging the energy storage 43 to the maximum energy storage level (MEN) 56 a disconnection of the energy store 43 from the DC voltage supplier 27 and / or from the charger 7th he follows. Disconnection from the DC voltage supplier 27 takes place by controlling the direct current network control device 30th over the signal connection 48 . Disconnecting the charger 7th takes place by direct control via the signal connection 9 .

A next higher level, which is in the data memory 55 is an Energy Consumption Maximizing Energy Storage Level (EMEN) 57 . As long as the energy storage capacity is full 43 higher than this level EMEN 75 initiates the control / regulation unit 8th a maximum operation of the consumers 18th until 21 , 37 and 38 .

In this case, for example, electric vehicles can be charged to the maximum via the alternating current consumer 21 as well as possibly via a direct current consumer according to the consumers 37 , 38 can be controlled. Energy-intensive calculation tasks can then also be carried out by a computer system that uses the direct current consumer 37 are connected. A water tank and / or a heat exchanger medium can also be heated. In such a case, a liquid pump can also be operated, the liquid in an elevated tank for later use of potential energy. Air conditioning can also be achieved by correspondingly releasing alternating current consumers or direct current consumers according to the consumers 18th until 21 , 37 , 38 can be controlled.

Cooling devices can also be operated when the EMEN 57 can be maximized. Such cooling units can then be used as cooling energy storage.

The EMEN level 57 is for example 90% of the MEN level 56 .

Below the EMEN level 57 is in the data store 55 an unconditional operating energy storage level (UEN) 58 stored, which for example at 50% of the level MEN 56 can lie. The control / regulation unit 8th is designed so that when charging the energy storage 43 above the UEN level 58 connecting all consumers 37 , 38 of the DC voltage module 3 with the DC voltage network 11 and connecting all consumers 18th until 21 of the AC voltage module 2 with the alternating voltage network 10 he follows. This is done by controlling the signal connections 35 , 36 on the one hand and the multi-pole, the respective switch 26th independently controlling signal connection 17th on the other hand. In this operating case "reaching the level UEN 58", the energy consumption is not as above in connection with the level EMEN 57 rather it gets maximized everybody over the consumer 18th until 21 , 37 , 38 Active energy demand covered and all consumers 18th until 21 , 37 , 38 can at any time to the networks 10 , 11 can be switched on or off.

Below the UEN level 58 there are several conditional operating energy storage levels (BEN) 59 until 61 . The control / regulation unit 5 is designed so that when the energy store is discharged 43 at these levels BEN 59 , 60 , 61 a priority-dependent separation of consumers 18th until 21 , 37 , 38 takes place according to a priority specification.

• - Priorität „bedingte Abschaltung bei Überlast“

The BEN level 59 which is in the range of 40% of the EMEN level 56 can combine the following priorities:

• - Priority "conditional shutdown in case of overload"

At peak loads in the DC voltage network 11 can all consumers marked with this priority 37 respectively. 38 be switched off for a short time.

• - Priorität „bedingte Abschaltung für ein vorgesehenes Zeitintervall“

The duration of such a short-term shutdown is also in the data memory 55 the control unit 8th deposited.

• - Priority "conditional shutdown for a specified time interval"

• - Priorität „bedingte Abschaltung beispielsweise Netzausfall“

All consumers that are marked with this priority can be switched off for a period of time, which is also stored in the data memory as the "switch-off duration" value 55 is deposited. After the switch-off period has elapsed, these consumers are "switched on" for a period of time, which is also stored in the data memory 55 is stored, switched on again. Each consumer can be assigned its own switch-off period / switch-on period, which is then stored in the data memory in a consumer-specific manner 55 are deposited. Due to a corresponding graduation of the periods of switch-off time / switch-on time, load peaks in the DC voltage network can be avoided 11 be avoided.

• - Priority "conditional shutdown, e.g. power failure"

• - Priorität „bedingte Abschaltung bei Freigabe“

All consumers assigned to this priority are activated when the BEN 59 in the event of failure of a supply via the AC voltage network 10 switched off after a specified delay period. This delay period is also in the data memory 55 filed. Consumers to which this priority is assigned can, for example, be the charging stations for electric vehicles and certain lighting modules.

• - Priority "conditional shutdown when enabled"

Consumers marked with such a priority correspond to the consumers 18th until 21 , 37 , 38 become when the level BEN 59 only switched off if at the same time the presence of a release signal via a corresponding input of the control / regulating unit 8th is captured. Such a release signal can be implemented as an active voltage signal, so that a fault in the release line, for example a line break, is automatically detected as a non-existent release. Such a consumer can be, for example, a heating system that is only switched off if this does not lead to frost damage. As soon as frost damage is to be feared due to corresponding outside temperatures, the release signal is controlled via the control / regulating unit 8th that activates, so that from then on when this level is reached it will BEN 59 it is not possible to switch off a consumer marked with this priority.

• - Priorität „bedingter Notstrombetrieb“

The BEN 60 which is below the BEN 59 at about 30% of the MEN level 56 the following priority is assigned:

• - Priority "conditional emergency power operation"

If all electricity suppliers fail, i.e. both the feed-in node 13th as well as the DC voltage supplier 27 represents the control / regulating unit 8th for all consumers marked with this priority 18th until 21 , 37 , 38 an emergency power operation for a set emergency power period, which is also stored in the data memory 55 , depending on the nominal capacity of the energy storage system 43 , is filed.

• - Priorität „unbedingter Notstrombetrieb“

The one below the BEN level 60 lying level BEN 61 which is in the range of 20% of the MEN 56 the following priority is assigned:

• - Priority "unconditional emergency power operation"

If all electricity suppliers fail, i.e. again if the energy node fails 13th and the DC voltage supplier 27 represents the control / regulating unit 8th for the consumers marked with this priority 18th until 21 , 37 , 38 emergency power operation over a longer period and depending on the nominal capacity of the energy storage system 43 adjustable duration safe. This period of time can also be stored in the data memory 55 be filed.

For example, a freezer can be an example for one of the consumers 18th until 21 , 37 , 38 first the priority "conditional shutdown for a specified time interval must be assigned. If the level in the energy storage device falls below 43 the BEN level assigned to this priority 59 , the freezer is switched off for the specified "switch-off time" period. If the freezer reaches its dew point, a temperature monitor in the system switches the priority of the freezer to "conditional emergency power operation". The freezer is then operated on until the energy storage level BEN is reached 60 until a certain, lower temperature is reached, whereupon the priority is switched back to "conditional shutdown for a specified time interval".

Below the BEN level 61 is in the data store 55 the control unit 8th a minimum energy storage level MIN 62 stored, which for example at 5% of the level MEN 56 can lie.

The control / regulation unit 8th is designed so that when the level falls below MIN 62 an emergency disconnection of the energy storage 27 from the DC voltage network 11 he follows. This in turn takes place via control of the direct current network control device 30th over the signal connection 48 .

Between the UEN levels 58 and MIN 62 as described above in connection with the BEN 59 until 61 explained, that is, several different conditional operating energy storage levels, with the control / regulating module 5 depending on the level of charge being reached, which corresponds to the respective level BEN 59 until 61 corresponds to a connection or disconnection of the consumers 18th until 21 , 37 , 38 with the respective prioritization.

Depending on the prioritization of the consumer, the control module 5 when discharging the energy store 43 a connection state of the consumer 18th until 21 , 37 , 38 with the associated network 10 , 11 maintained until the energy storage level corresponding to the respective priority is undershot. The opposite remains when the energy store is charged 43 a connection state of the respective consumer is disconnected depending on the priority until the energy storage level assigned to this priority is exceeded.

3 shows schematically a component or a logic module 63 the control unit 8th , which with the data storage 55 is in signal connection. This logic component 63 has different logical inputs and outputs. With P0 until P6 are different logical priority inputs corresponding to the above connection with the BEN levels 59 until 61 outlined priorities. So much for such a priority input P0 until P6 is active, is done with the control module 5 a connection or disconnection of consumers, according to what has been explained above. Another entrance 64 signals that the EMEN level has been reached 57 . Further entrances 65 , 66 signal a consumer-specific switch-off period or a consumer-specific switch-on period. Another entrance 67 indicates a consumer-specific nominal power.

Another entrance 68 represents an enable signal for the priority explained above, "conditional shutdown on enable". Another input 69 enables loads to be switched on to avoid overloading the energy store 43 .

Claims (7)

Control / regulating module (5) for a modular control / regulating system for a power network with an alternating voltage module (2) with an alternating current network (10), with a direct voltage module (3) with a direct voltage supplier (27) and a direct current network (11), and with an energy storage module (4) with at least one battery cell (44), - wherein the control / regulating module (5) can be brought into signal connection with a charging power supply unit (7) and an inverter (16) of the AC voltage module (2) as well as with at least one DC voltage power supply unit (33, 34) and a direct current network control device (30) of the DC voltage module (3), - The control / regulating module (5) is designed for supply-dependent and demand-dependent specification - an alternating voltage recharge via the charger (7), - A conversion of direct current into alternating current via the inverter (16), - a conversion of mains direct voltage into supply direct voltage via the at least one direct voltage power supply unit (33, 34), - a DC voltage charge of the battery cell (44) from the DC voltage supplier (27) via the DC network control device (30), - wherein in a data memory (55) of the control / regulating module (5) several energy storage levels (56 to 62) are stored, which characterize a relative fill level of the energy storage (43), - The control / regulating module (5) is designed so that - when charging the energy store (43) to a maximum energy store level (56), the energy store (43) is disconnected from the DC voltage supplier (27) and / or from the charging power supply (7), - When charging the energy store (43) beyond an unconditional operating energy store level (58), all consumers (37, 38) of the DC voltage module (3) are connected to the DC voltage network (11) and all consumers (18 to 21) the AC voltage module (2) takes place with the AC voltage network (10), - When discharging the energy store (43) up to a compared to the unconditional operating energy storage level (58) lower conditional operating energy storage level (59 to 61) a disconnection of consumers of the DC voltage module (37, 38) from DC voltage network (11) and / or loads (18 to 21) of the AC voltage module (2) from the AC network (10) according to a priority specification stored in the data memory (55), - When the energy store (43) falls below a minimum energy storage level (62), the energy store (43) is emergency disconnected from the power grid (10, 11). Control module according to Claim 1 , characterized in that in the data memory (55) of the control / regulating module (5) between the minimum energy storage level (62) and the unconditional operating energy storage level (58) a plurality of conditional operating energy storage with different priorities Levels (59 to 61) are stored, the control / regulating module (5) depending on the reaching of a charge state of the energy store (43), which corresponds to the respective conditional operating energy storage level (59 to 61), a connection or disconnection of the Consumers (18 to 21, 37, 38) with the respective prioritization stored in the data memory (55). Control module according to Claim 1 or 2 characterized in that in the data memory (55) of the control / regulating module (5) between the maximum energy storage level (56) and the unconditional operating energy storage level (58) an energy consumption maximizing energy storage level (57) is filed, wherein the control / regulating module (5) initiates operation of the loads (18 to 21, 37, 38) which are connected to the direct current network (11) and the alternating current network (10) when the energy consumption maximizing energy storage level (57) is reached are. Control module according to one of the Claims 1 until 3 , characterized in that the control / regulating module (5) is designed so that when the energy store (43) is discharged, a connection state of the consumers (18 to 21, 37, 38) of the DC voltage network (11) and the AC voltage network (10) is maintained is until one of the energy storage levels (57 to 62) is undershot. Control module according to one of the Claims 1 until 4th , characterized in that the control / regulating module (5) is designed so that when the energy store (43) is charged, a connection state of the loads (18 to 21, 37, 38) of the DC voltage network (11) and the AC voltage network (10) remains disconnected until one of the energy storage levels (57 to 62) is exceeded. Control module according to one of the Claims 1 until 5 , characterized by a consumption control component (63) with logic inputs (P0 to P6) which correspond to the various conditional operating energy storage levels (59 to 61). A method for operating a modular control system (1) for a power grid with an AC voltage module (2) with an AC power system (10) with a DC voltage module (3) with a DC voltage supplier (27) and a DC power system (11), and with an energy storage module (4) with at least one battery cell (44), using a control / regulating module (5) with the in the Claims 1 until 6th specified features.

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