DE102017213265A1 - A method for providing control power for grid frequency stabilization of a power grid and / or for meeting a performance timetable and control device for a technical system and technical system - Google Patents

Abstract

The invention relates to a method for providing control power (15) for grid frequency stabilization of a power grid (14) and / or for fulfilling a power timetable (18) of the power grid (14), wherein the control power (15) is provided by means of an aggregate (13) and the control power (15) to be provided in successive control clocks will each specify as a control power setpoint (P). The invention provides that the unit (13) by a plurality of technical equipment units (11) is provided and each of the unit units (11) has a device characteristic and each unit (11) a control device (22) a device power (P) of Appliance unit (11) to a device setpoint (P) controls, and that for each unit (11) a respective share to be supplied (P) to the control power (15) as the ratio of the device characteristic of the respective unit based on the respective device characteristics of the remaining or set of all device units (11) and the respective device setpoint (P) in dependence on the control power setpoint (P) and the respective proportion is set.

Description

The invention relates to a method for providing control power for grid frequency stabilization of a power grid or to meet a power timetable of the power grid. The control power is provided by means of an aggregate, ie an arrangement of several technical units. The unit is given the control power to be provided as a control power setpoint in successive control cycles. The invention also includes a control device for carrying out the method in a technical system and a technical system with the control device.

For a power grid can be provided to stabilize the grid frequency by an aggregate is connected to the power grid, which feeds or removes electrical power to regulate the grid frequency to a desired frequency. This is called the primary control power.

A technical installation may be designed to follow a pre-defined schedule when exchanging electrical power with the mains. A technical installation in the sense of the invention can be, for example, a production site or a production site or a production hall with, for example, production lines or production robots. A system can also be implemented, for example, by an office building. By "exchanging" power is meant here both the removal and the feeding of electrical power. The power timetable provided for this purpose may, for example, have been previously determined on a power exchange. If the power requirement or the performance of the system deviates from the performance timetable, an aggregate can be provided in the system which compensates for the deviation from the performance timetable by additionally feeding or additionally removing electrical power, so that the entire technical system is still in relation to the power grid meets or complies with the performance timetable.

An example of a suitable for this aggregate is an arrangement of electric batteries or batteries. A disadvantage of such an aggregate, however, is that it requires an additional investment to equip a technical system with such an aggregate.

In order to not have to provide control power of a particular power value with a single plant, the DE 10 2014 009 953 A1 known to combine several smaller technical equipment to a so-called virtual power plant. These technical systems are connected to the grid at different grid connection points and are coordinated via the Internet in terms of their mode of operation. It can thus be achieved that the large number of small technical installations can provide a predetermined control power overall in comparison to the power grid, although each individual technical installation alone would not be able to generate enough power to do so. Another example of such a virtual power plant for providing control power is from the DE 10 2015 200 569 A1 known. However, a virtual power plant combines several technical systems, all of which must have a so-called pre-qualification for the provision of control power. But that's not always economical.

These known from the prior art method for providing control power require a variety of special system components, such as a cogeneration unit or a battery storage.

The invention has for its object to provide by means of at least one technical system in a power grid control power to stabilize, for example, a grid frequency of the power grid and / or to meet a performance timetable against the power grid by means of the system.

The invention solves this problem by means of the subjects of the independent claims. The invention has advantageous developments, which are described by the dependent claims, the following description and the figures.

The invention provides a method for providing control power for network frequency stabilization of a power grid and / or fulfillment of a power timetable by means of an aggregate. The control power to be provided for this purpose is adjusted by setting in each case a control power setpoint in successive control cycles.

According to the invention, it is now provided that the unit used is a plurality of technical units of at least one technical installation in which the technical units are operated. Preferably, it is device units of a single technical system. If a technical installation has a ventilation system, for example, the technical units may be the electric motors of the ventilation system, for example in a production facility. In general, each unit of equipment is an installation component which, independently of the provision of the control power, already provides in the installation for providing a function relating to the operation of the installation is provided. In other words, each device unit within the system has a function that is independent of the provision of the control power with respect to the power network. An example is the engine of a ventilation system whose function is to convey an air flow. Each of the device units is characterized by a device characteristic of a predetermined characteristic. For example, engines of different sizes have an electrical rated power as a parameter, the specific device characteristic value of each motor describing its specific nominal power value. The device power actually provided by a device unit will adjust to a device setpoint by a controller of the device unit. In other words, each device unit is operated regulated by their control device. By specifying the unit setpoint, the unit performance provided by the unit can be adjusted.

The required control power is provided by the device units together by means of the method. However, since the equipment units have different equipment characteristics with respect to said characteristic (e.g., rated power), the method provides that each equipment unit participates in providing the control power only to the extent that corresponds to its equipment characteristic. For this purpose, a respective proportion of the control power to be provided is determined for each appliance unit, namely as the ratio of the appliance characteristic value of the respective appliance unit relative to the respective appliance characteristic values of the remaining or all appliance units. A more powerful engine must therefore provide a greater proportion of the control power than a less powerful engine. In order for each device unit actually to make its share of the control power, it is provided that the device setpoint value of the respective control device of each device unit is set as a function of the control power setpoint and the proportion of the control power determined in each case. If only electrical consumers are provided as appliance units, such as the ventilation motors mentioned, the power consumption of the installation with respect to the power grid is thus increased or reduced overall by adjusting its nominal device values. A reduction of the reference power results in a positive control power in the power grid; an increase in the reference power results in a negative control power.

The invention provides the advantage that no additional technical unit must be installed in a technical system in order to be able to provide control power for a power supply system by means of the system. Instead, such plant components, namely the technical equipment units, which are already provided for providing a respective function within the technical installation, can also be used to jointly provide the predetermined control power. Here, the control power setpoint is divided depending on the performance of each unit of the unit on this, by determining the proportion of the control power to be provided for each unit of equipment on the basis of the device characteristics of the device units. It can then be used to control the device of each unit to set the respective device performance of the unit so that the plurality of technical equipment units overall provides the control power against the power grid.

The said characteristic taken into account can be selected depending on the control target for the control power. Particularly suitable as a parameter but the respective rated power of the respective unit unit. In the case of technical units which are also intended to provide additional control power during their normal operation, the nominal power is a suitable measure for setting or executing the division of the requested control power over several units of equipment. The device characteristic value can also refer to another parameter. The rated power has the advantage that it can be stored as a data point in the frequency converter of the unit and can be read from there. As an alternative characteristic, the available power flexibility (e.g., defined as the minimum of possible positive and negative power changes) of the respective device unit may be taken as the basis. Alternatively, a time constant or a reaction time of a device unit may be a possible parameter. The device characteristic may then indicate how quickly a device unit can provide a change in performance. The share of the control power of each individual device unit to be provided then indicates, for example, that the fastest device unit also has to provide the largest share.

It is preferably provided that the respective control device of each device unit comprises a PID controller (PID - proportional, integral, differential) or PI controller. As a result, in spite of the parallel operation of several units, which provide a total of the control power on the power supply, a swing or oscillation of the time course of the provided control power prevented. In particular, overshoot after a sudden change in the control power setpoint is reduced. An overshoot can be kept at a value below 20%.

In order to calculate the proportion of the control power to be provided for each device unit, it is preferable to determine a proportion factor which, for each of the device units, has their device characteristic value (for example, their rated power value) divided by the sum the device characteristic values of all the device units (for example sum of the nominal power values of all device units). The sum of all proportional factors thus results in 1. This ensures that the total requested or predetermined control power is provided by all unit units.

In order nevertheless to monitor the total control unit power provided by the unit units, a further development provides that an aggregate control difference of the unit is determined as a function of the control power setpoint (ie the control power to be provided) and an actual control power currently provided by the unit units as an aggregate becomes. In this way, for example, be recognized if a device unit does not provide the prescribed her portion of control power, for example, because their control device is defective or the unit has failed altogether.

In order to be able to divide a missing portion of the control power to be provided back to the other unit units, it can be provided that an aggregate nominal value is determined as a function of the aggregate control difference by an additional, common aggregate control device. In other words, the aggregate is preceded by an additional aggregate control device, which can receive the control power setpoint, then calculate the aggregate control difference based on the control power setpoint and the actual control power, and then calculate an aggregate setpoint for the entire aggregate. This aggregate desired value is then divided according to the proportion of the control power to be provided by the device unit to the device units. Each device unit can then determine its respective device setpoint from its associated fraction of the nominal unit value. Thus, a regulator cascade results from the aggregate control device and the plurality of downstream, parallel control devices of the device units.

If a conventional controller is used in the aggregate control device, it generates a manipulated variable at its output as a function of the aggregate control difference, which only reflects the missing control power for reaching the control power setpoint. In other words, then the aggregate setpoint value of the absolute control power setpoint itself is no longer considered. It is therefore provided according to a development that the current operating point of each device unit is taken into account when forming the current device setpoint. For this purpose, first the difference between the control power setpoint of the current control clock and the control power setpoint of a preceding control clock is calculated for the respective current control clock. It is thus described by this difference, the change in the control power setpoint, as it has resulted between the two control clocks. To calculate the said aggregate control difference, the actual control power can then be subtracted from this difference. The aggregate control device then determines the aggregate setpoint from the aggregate control difference calculated in this way. For each device device then results from the so determined by the aggregate control unit aggregate setpoint only the additionally to be provided share of control power, as he has to provide additionally since the previous control cycle. Here then still missing that portion, which was already to provide before the previous regular clock. With others, the aggregate setpoint no longer specifies the absolute control power to be provided. In order to recalculate these values, the proportion of control power already provided by the device output is additionally added to each device device in the aggregate setpoint assigned to it. This is the current operating point of the device unit, which describes the already regulated proportion of control power and thus can be used as "memory value" for the still missing portion of the aggregate setpoint. By adding the divided to the respective unit unit Aggregatesolwert and the current yielded proportion of control power again results for the unit of the absolute value of the proportion of the control power to be provided by it.

As already stated, each device unit also fulfills or provides a function within the system. For this purpose, it may be provided that one or some or all of the device units additionally specify a useful power to be provided by the device unit in the installation as a respective normal operating setpoint value. The net power can e.g. be a capacity of a ventilation system or a conveyor system or be the charging power for an electric vehicle. The unit also provides a net power within the system. For the respective control device of the respective device unit is then calculated their device setpoint of (total) device power to be regulated as the sum of the normal operating setpoint (for the net power) and the proportion of the control power to be provided. Thus, therefore, the device setpoint reflects the total device performance, which is used on the one hand as useful power within the system and on the other hand represents the proportion of the control power, which is exchanged by the aggregate formed from the unit units with the power grid.

Now, however, a separate regulation or specification of the net power on the one hand and the control power on the other hand should be possible. For this purpose, the device power provided by each device unit must be divided into the proportion of the control power and the net power. It is preferred For this purpose, the respective proportion of the control power provided by the appliance unit is determined as the difference between the total unit performance of the appliance unit and the desired setpoint value.

The method can be operated with a control clock, which provides intervals of the control clocks in a value range of 0.1 seconds to 20 min. As a result, therefore, the aggregate formed from the unit units can be fully operated for the provision of primary control power. Because the power signal for the provision of primary control power (control power setpoint) takes place every second. The power signal for stopping a performance timetable can be made every 15 minutes. The total deliverable control power can range from 10kW to 10MW. The control power is made up of the possible proportions of the units of the control unit. Their deliverable share of the control power can be in the single-digit kW range.

It should be noted that the device units are preferably provided within a single technical installation, i. the unit units are then connected via a common grid connection of the system to the mains. There is no need for distributed operation of the device units at different locations and thus different network connection point. However, it can also be provided that unit units several systems are coupled to form an aggregate in the context of the invention.

As an appliance unit, for example, an engine of a ventilation system and / or a conveyor belt system and / or a charger for recharging an electric vehicle can be used, for example. It should be noted that by means of a motor not only control power in the form of consumed electrical power can be provided. By means of a technical device unit, electrical power can also be "released" by the device unit reducing the device power generated or provided by it. In the case of a ventilation system and / or a conveyor belt system, this has only a minor effect on the actual function (conveying). In particular, if such a deviation of the net power from the normal operating value lasts less than 10 minutes, thereby the operation of the system can continue to take place trouble-free. Of course, the time value depends on the underlying processes and the performance deviation. The power deviation may also last up to 1h, e.g. the process behind it reacts uncritically. This can be checked in advance by the skilled person. It can also be provided that the ratio of the proportion of the control power provided by a device unit to the useful power generated or provided by the device unit is kept smaller than a predetermined threshold value. Thus, the influence of the control power setpoint on the function of the unit can be limited.

In order to determine the control power setpoint, it can be provided that this is calculated as a function of a deviation of the mains frequency of the power supply from a predetermined setpoint frequency (for example 50 Hz or 60 Hz).

In order to carry out the method according to the invention in at least one technical installation, the invention also provides a control device for the at least one installation. It is assumed that the at least one system has the plurality of device units, each of which represents a system component of the at least one system that already provides an internal system function within the respective system. The control device has a computing device which is set up to carry out an embodiment of the method according to the invention. For this purpose, the computing device can be provided, for example, on the basis of at least one microprocessor and / or at least one microcontroller. The computing device may also be a distributed computing device, as may be implemented by a building management system, for example. The computing device may also include the control devices of the individual device units. These can be designed, for example, as a PLC (programmable logic controller). In addition, there may be a central computer which controls the distribution of the control power to be provided to the individual control devices of the device units. Thus, the aggregate control device can be operated by the central computer. By means of the method, device units of several technical systems can also be operated in a coordinated manner in the manner described, so that therefore the device units are connected to the power network via different grid connection points. The operation of the device units is then coordinated by the method such that the device units act collectively as an aggregate providing the requested control power in the power grid.

The invention also includes a technical system with the plurality of device units and with an embodiment of the control device according to the invention for controlling the device units.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively specified combination, but also usable in other combinations or in isolation.

• 1 eine schematische Darstellung einer ersten Ausführungsform der erfindungsgemäßen Anlage;
• 2 eine schematische Darstellung einer Geräteeinheit der Anlage von 1;
• 3 eine schematische Darstellung einer zweiten Ausführungsform der erfindungsgemäßen Anlage;
• 4 eine schematische Darstellung einer Geräteeinheit der Anlage von 3.

The invention will now be explained in more detail with reference to a preferred embodiment and with reference to the drawings. Show it:

• 1 a schematic representation of a first embodiment of the system according to the invention;
• 2 a schematic representation of a device unit of the system of 1 ;
• 3 a schematic representation of a second embodiment of the system according to the invention;
• 4 a schematic representation of a device unit of the system of 3 ,

1 shows a technical system 10 which can be, for example, a production site. In the plant 10 can have multiple device units 11 be provided, each for the operation of the plant 10 can be provided by performing an in-plant function. For example, it may be motors of a ventilation system 12 act. The device units 11 can at the plant 10 additionally as an aggregate 13 cooperate, ie their operation can be coordinated so that the device units 11 like a single aggregate 13 act as an additional function provides. By means of the aggregate 13 can namely for a power grid 14 control power 15 to be provided. The attachment 10 can via a network connection point 16 with the power grid 14 be connected to operate electric power or electrical energy from the mains 14 to receive or feed into this. In addition, by means of the aggregate 13 the control power 15 in the power grid 14 to be provided. By replacing the control power 15 can eg a network frequency 10 of the electricity network 14 stabilized and / or the plant 10 can have a performance timetable 18 in terms of power exchange with the power grid 14 comply. The attachment 10 with the aggregate 13 may be prequalified for the provision of primary balancing power. This allows a marketing of small flexibilities of the units 11 networked.

The control power 15 can each be predetermined with a predetermined control clock with a predetermined clock rate. The clock rate can be in the range of 0.1 second to 30 seconds, that is, for example, 1 second. The control power to be provided 15 is specified in each case as a control power _setpoint P _{soll_RL, aggregate} , which can be set, for example, in the unit kilowatts (kW). In the figures, such performance figures are each in kilowatts.

At the plant 10 can be provided that the control power _setpoint P _{soll_RL, aggregate} by an _{allocation device} 19 is converted, so for each unit 11 a corresponding proportional setpoint P _{soll_RL, i} for a control device 22 the device unit 11 where i is the index for the device units 1 to n and n is the total number of units 11 of the aggregate 13 indicates.

wobei P_{Nenn,Aggregat} die Summe aller Nennleistungen P_Nenn,i für alle i = 1 bis n ist.The splitting device 19 For example, for each device unit 11 use a device characteristic of a parameter. The parameter can be, for example, the nominal power P _{nominal, i of} the respective device unit 11 be. The index i represents the device units 1 to n. This results for each device unit 11 a value of the share P _{soll_RL, i} to be provided in the control power 15 , which can be calculated from the control setpoint P _{soll_RL, aggregate} with a share factor: $${\text{P}}_{\text{soll\_RL}\text{i}}={\text{P}}_{\text{soll\_RL}\text{, aggregate}}·{\text{P}}_{\text{nominal}\text{i}}/{\text{P}}_{\text{nominal}\text{, aggregate}}$$

where P _{Nom, Aggregate is} the sum of all nominal powers P _{Nom, i} for all i = 1 to n.

The device units 11 then _produce a respective proportion P _{ist_RL, i} at an actual control power P _{ist_RL, aggregate} , which is then accumulated 20 in the plant 10 for example at the grid connection point 16 is available.

2 illustrated for a single device unit 11 , like this example, an electric machine 21 for providing a device power P _{ist_ges, 1} may have. 2 illustrates the device unit 11 with the index i = 1 off 1 , 2 However, it is a representative illustration of all device units 1 to n, the in 1 are shown.

A control device 22 the device unit 11 can the electric machine 21 to a device setpoint P _{soll_ges, 1} adjust. Furthermore, for illustrative purposes, a frequency converter is shown by way of example 23 for setting a target speed f _{soll of} the electric machine 21 , The electric machine 21 then reacts with an actual speed f _is , by a detection device 24 in the of the electric machine 21 provided device power P _{ist_ges, 1} can be converted.

The device setpoint P _{soll_ges, 1} can be calculated from the proportion P _{soll_RL, 1 of} the total control power to be provided 15 and a normal operation setpoint P _{normal, 1} , by an addition 25 to the device setpoint P _{soll_ges, 1} can be combined.

By a subtraction 26 of the device power P _{ist_ges, 1} from the device setpoint P _{soll_ges, 1} can be calculated. By means of a regulator 27 , For example, a PID controller, a control signal P _{control, 1} eg for the frequency converter 23 is produced.

To benefit from the device power P _{ist_ges, 1} the proportion contained therein or services P _{ist_RL, i} to control power 15 can be determined by a subtraction 28 of the device power P _{ist_ges, 1} the normal _{operating setpoint} P _{normal, 1} subtracted. This results in the delivered share P _{ist_RL, 1} in the _balancing power 15 that then through the accumulation 20 to the total of the aggregate 13 provided control power P _{ist_RL, aggregate} can be combined.

The calculations described, including those of the splitting device 19 can by a control device CNTRL the plant 10 be carried out, which may have a computing device for this purpose.

In the plant 10 thus provides the device unit 11 due to the regulation by the control device 22 every device unit 11 overall the net power, as given by the normal operating setpoint P _{normal, 1} for each unit of equipment 11 is predetermined. The net power can be adjusted internally as required independent of the control clock. In addition, the system exchanges 11 with the power grid 14 the control power 15 off, which can be adjusted or specified with the described clock rate and in addition by the device units 11 is provided. For this purpose, the in 2 illustrated device unit 11 with the index i = 1 the normal _{operating setpoint} P _{normal, 1} the respective proportion P _{ist_RL, 1} at the control power to be provided 15 modulated or added. Due to additional power consumption can be used as a control power 15 an energy intake of the aggregate 13 and by reducing the device power P _{ist_ges, 1} may be an additional output to control power 15 be effected.

3 illustrates a development of the system 10 in which the aggregate 13 an aggregate control device 29 upstream. The aggregate control device 29 can, for example, a controller 30 which may be a PID controller.

By means of a subtraction 31 For example, an aggregate _{control difference} P _{error_RL, aggregate} can be calculated, which represents a deviation of the actual control power P _{ist_RL, aggregate} of the control power P _{soll_RL} to be provided _{, aggregate} . Here, the aggregate control _difference P _{error_RL, aggregate} with respect to the control power _setpoint P _{soll_RL, aggregate} or else to a delta of the control power _setpoint P _{soll_RL, aggregate} between the current control clock t and the previous control clock t-1 can be calculated. The aggregate control device 30 From the aggregate _{rule difference} P _{error_RL, aggregate can} then calculate an aggregate _setpoint P _{control_RL, aggregate} , which is based on the unit of equipment 11 through the splitting device 19 can be split.

The distribution facility 19 can then again the value for the proportion P _{soll_RL, i} in the control power 15 calculate as follows: $${\text{P}}_{\text{soll\_RL}\text{i}}={\text{P}}_{\text{controll\_RL}\text{, aggregate}}·{\text{P}}_{\text{nominal}\text{i}}/{\text{P}}_{\text{nominal}\text{, aggregate}},$$

4 illustrated in the representative example of the device unit 11 with the index i = 1, as based on this value for the proportion P _{soll_RL, 1 of} the control power 15 then in the device unit 11 the regulation by means of the control device 22 can be carried out. 4 is again a representation of the device unit 1 but representative of all device units 1 to n of 3 ,

Since the aggregate control device 30 the aggregate _setpoint P _{control_RL,} output _unit as a control signal, can by means of an addition 32 the absolute proportion P _{soll_RL_ges, 1 of} the control power to be provided 15 by additionally adding the fraction P _{ist_RL, 1 is} the control power provided 15 be calculated. Then, in the manner already described, by adding the normal operating setpoint P _{normal, 1} the device setpoint P _{soll_ges, 1} can be calculated and the control 27 be carried out in the manner described.

By the individual control of each unit 11 by means of her regulator 27 can the reaction time of the aggregate 13 for adjusting the control power _setpoint P _{soll_RL, aggregate} . Also, overshoots in the course of the generated control power 15 can be reduced.

So can in a plant 10 by aggregating the performance of multiple device units 11 a total marketable control power can be provided without an additional, dedicated to the provision of control power control unit is needed, so for example a battery storage or a combined heat and power plant. It only need the control devices 22 the device units 11 be extended by custom programming in addition to the control power 15 to be able to provide. The proportional distribution of the control power to be provided 15 or the control power _setpoint P _{soll_RL, aggregate} to the individual device units 11 is preferably carried out according to their respective rated power P _{nom, i} and can by the splitting device 19 respectively. Through the plant 10 Thus, a higher marketable performance (namely the additional control power provided 15 ) and thus a higher income can be achieved.

The example illustrates how a ventilation system can be adapted to control technology in order to market its primary control power.

LIST OF REFERENCE NUMBERS

10

investment

11

unit

12

ventilation system

13

aggregate

14

power grid

15

control power

16

Grid connection point

17

power frequency

18

performance schedule

19

A distributor

20

accumulation

21

Electric machine

22

control device

23

frequency converter

24

measuring device

25

addition

26

subtraction

27

regulator

28

subtraction

29

Physical control device

30

regulator

31

subtraction

32

addition

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014009953 A1 [0005]
• DE 102015200569 A1 [0005]

Claims (15)

A method for providing control power (15) for grid frequency stabilization of a power grid (14) and / or fulfillment of a power timetable (18) of the power grid (14), wherein the control power (15) is provided by means of an aggregate (13) and the one to be provided Control power (15) in successive control _clocks in each case as a control power _setpoint (P _{soll_RL, aggregate} ), characterized in that the unit (13) by a plurality of technical equipment units (11) is provided and each of the unit units (11) has a device characteristic value and in each device unit (11) a control device (22) _regulates a device power (P _{ist_ges, 1} ) of the device unit (11) to a device nominal value (P _{soll_ges, 1} ), and that for each device unit (11) a respective proportion to be supplied ( P _{soll_RL, 1} ) at the control power (15) as the ratio of the device characteristic value of the respective device unit with respect to the j Meanwhile, the device characteristic values of the remaining or all device units (11) are defined and the respective device setpoint (P _{set_ges, 1} ) is set as a function of the control power _setpoint (P _{set_RL, aggregate} ) and the respective proportion. Method according to Claim 1 , wherein the device characteristic value indicates a respective nominal power of the respective device unit (11). Method according to one of the preceding claims, wherein the respective control device (22) comprises a PID controller (27) or a PI controller. Method according to one of the preceding claims, wherein the proportion is calculated by means of a share factor, which for each of the device units (11) is their device characteristic divided by the sum of the device characteristics of all the device units (11). Method according to one of the preceding claims, wherein depending on the control power _setpoint (P _{soll_RL, aggregate} ) and one of the unit units (11) as a total aggregated actual control power (R _{ist_RL, aggregate} ) an aggregate control _difference (P _{error_RL, aggregate} ) of Aggregate (13) is determined. Method according to Claim 5 in which, depending on the aggregate _{control difference} (P _{error_RL, aggregate} ), an aggregate _{setpoint value} (P _{control_RL, aggregate} ) is determined by an additional, common aggregate _{control device} (29) and the aggregate _{setpoint value} (P _{control_RL, aggregate} ) is determined according to that of the respective device unit (11). to be provided portion of the control power (15) to the unit units (11) is divided, in order to determine the respective device setpoint (P _{soll_ges, 1} ). Method according to Claim 6 , wherein a difference (P _{error_RL, aggregate} ) between the control power _setpoint (P _{soll_RL, aggregate} ) of the current control clock and the control power _setpoint (P _{soll_RL, aggregate} ) of a previous control clock is calculated for each current control _clock and for each device device (11) in the Aggregate _setpoint (P _{set_ges, 1} ) divided _{thereupon is} added to (32) the proportion of the control power (P _{ist_RL, 1} ) currently provided by the device unit (11). Method according to one of the preceding claims, wherein at one or some or all of the device units (11) in each case additionally provided by the device unit (11) in the system (10) useful power as a respective normal operating setpoint (P _{normal, 1} ) and for the respective control device (22) of the device unit (11) whose device nominal value (P _{soll_ges, 1} ) of the device power to be adjusted (P _{ist_ges, 1} ) is the sum of the normal _{operating setpoint} (P _{normal, 1} ) and the part to be _generated (P _{soll_RL, 1} , P _{soll_RL_ges, 1} ) of the control power (15) is calculated. Method according to Claim 8 in which the respective proportion (P _{ist_RL, 1} ) of the control power (15) provided by the appliance unit (11) is determined as the difference (28) of the _{appliance output} (P _{ist_ges, 1} ) and the normal _{operating setpoint} (P _{normal, 1} ). Method according to one of the preceding claims, wherein time intervals of the control clocks in a value range of 0.1 seconds to 20 minutes. Method according to one of the preceding claims, wherein the device units (11) via a common network connection point (16) of the system (10) to the power grid (14) are connected. Method according to one of the preceding claims, wherein as the unit units (11) in each case a motor of a ventilation system (12) and / or a conveyor system of the system (10) and / or a charger for recharging an electric vehicle are used. Method according to one of the preceding claims, wherein the control power _setpoint (P _{soll_RL, aggregate} ) is _calculated in dependence on a deviation of a mains frequency (17) of the power network (14) from a predetermined nominal frequency. Control device (CNTRL) for a system (10) having a plurality of device units (11), characterized in that the control device (CNTRL) has a computing device which is connected thereto is set up to carry out a method according to any one of the preceding claims. Technical installation (10) with a multiplicity of device units (11), characterized in that the installation (10) has a control device (CNTRL) according to Claim 14 for controlling the appliance units (11).

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