Method for verifying electrical energy system

Abstract

The invention relates to a method for verifying an electrical energy system (1) in a building, said method comprising a step of predefining an interconnection mode of the electrical energy system. The interconnection mode describes an arrangement of a plurality of components of the electrical energy system (1) and its relative position and connection. In a further step, the electrical energy system (1) is brought into a first operating state by controlling at least one component. At least one measured value is recorded in a first operating state. A rationality check is made as a function of the at least one measured value and a predefined interconnection pattern. And outputting a signal according to the result of the rationality check.

Description

Technical Field

[0001] The present invention relates to a method and an electrical system for verifying an electrical energy system in a building. In particular, the electrical connection mode of the electrical energy system is to be checked. Background Art

[0002] German patent application DE 10 2018 206 214 describes a method for operating an energy supply system in a building. The system comprises a regulating or control device which receives measured values ​​and regulates and / or controls the operating state of the system. Such a regulating or control device is also referred to as an EMS ("Energy Management System") or HEMS ("Home Energy Management System").

[0003] If a new electrical energy system is installed in a building or changes are made to an existing energy system, the electrical connection mode of the energy system must be configured in the control device of the energy system when the energy system is (re)commissioned. An incomplete or defective connection mode can lead to malfunctions during the operation of the electrical energy system. Therefore, the connection mode must usually be checked, which, however, can be very complex and partly prone to malfunctions in practice. Therefore, an automatic or guided verification of the electrical energy system is required. Summary of the invention

[0004] The invention is based on the problem of overcoming the problems known in the prior art and specifying a method for verifying an electrical energy system which is improved over the prior art. Furthermore, an electrical energy system which is improved over the prior art and has a control device (HEMS) is to be provided.

[0005] The control device is capable of acquiring or regulating and / or controlling the operating state or operating parameters of the electrical energy system or individual components of the energy system. Depending on the function, the control device can also be regarded as a feedback control device. In the following, the control device is also referred to as a "HEMS".

[0006] According to the invention, this problem is solved by a method for verifying an electrical energy system according to claim 1 and an electrical energy system according to claim 9. Preferred embodiments of the invention are set forth in the dependent claims, the drawings and the following description of exemplary embodiments.

[0007] One objective of the method is to automatically determine the position of a component in an electrical energy system or an electrical connection pattern of an energy system by means of an optimized test method. In addition, deviations between the actually installed connection pattern and the provided connection pattern or the connection pattern selected by the user are to be detected.

[0008] The connection mode describes the arrangement of various components of the electrical energy system and their relative positions and connections to each other. In graphics, the connection mode can be displayed by corresponding component symbols and connecting lines, especially schematically.

[0009] Exemplary components of an energy system are generators, such as PV systems and / or fuel cells, which provide electrical energy. PV systems or fuel cells usually have a (controllable) inverter in order to provide alternating current to the local network of a building.

[0010] Furthermore, the energy system may have controllable loads, such as heat pumps, electrical heating devices and / or electric vehicles or their charging stations (also called wall boxes). The electrical heating device may be, for example, a heating rod of a heat pump for heating water. The heating rod may support the heat pump, in particular at very low outside temperatures. The term "controllable load" also includes loads that are merely controllable.

[0011] An energy store which is arranged in a fixed manner in a building and has, for example, a battery or a rechargeable battery can likewise be understood as a controllable load, since the energy store consumes energy during the charging process and parameters such as time, period, charging power, etc. can be determined by the control device HEMS. Furthermore, the energy store can also be understood as or operated as a controllable generator, in particular since it can provide stored energy as a function of regulation or control signals from the HEMS.

[0012] In addition, the electric energy system includes a plurality of uncontrollable loads, such as household appliances, electric lights, etc. The HEMS cannot directly influence the corresponding operating states of the uncontrollable loads.

[0013] The electrical wires for current or voltage may be collectively referred to as a local network. The connection of the loads is made, for example, via sockets connected to the local network.

[0014] Furthermore, the electrical energy system comprises a grid connection point, via which electrical energy can be drawn from the public grid or locally generated energy can be fed into the public grid. The relative position of the grid connection point with respect to the other components is described by a connection mode.

[0015] Furthermore, the electrical energy system comprises at least one measuring device, in particular an electric meter for measuring current or energy consumption, power consumption, energy generation or power output. For example, the electric meter can be arranged at a grid connection point and / or at other nodes of the electrical energy system. In particular, for example, the consumption of a controllable load and / or the power generation of a local energy generator (e.g. a PV system) can be acquired by a separate meter. In a preferred embodiment, the energy system can have a plurality of measuring devices. In the following description, the terms measuring device, electric meter and meter can be used synonymously.

[0016] The central control unit (HEMS) serves to regulate and / or control the energy system, in particular at least one controllable consumer and / or at least one energy store and / or the at least one generator.

[0017] Furthermore, the control device acquires the measured values ​​of the electric meter. The control device may also have a human-machine interface, through which a user can make inputs and read outputs. To this end, the control device may have a display device and an input device. Alternatively or additionally, the control device may be connected to a network so that inputs and / or outputs can be made, for example, via an application or a browser on a user terminal (e.g. a laptop or a smartphone, etc.).

[0018] In the following, the individual method steps of the method according to the present invention are described, which can be performed individually, continuously or simultaneously. Not all steps are necessary to solve the problem of the present invention, so individual steps can also be omitted.

[0019] In a first step, a connection mode of the electric energy system is provided. For example, the connection mode can be provided by a user.

[0020] Preferably, the provisioning can be automated. For example, the HEMS can provide a connection mode based on automatically detected components, or output a suggestion to the user, who can accept or reject the suggestion.

[0021] According to a preferred embodiment, the provision of the connection mode can be carried out interactively with the user. For this purpose, a human-machine interface is first started, which can have a graphical user interface, which is executed, for example, via a browser or an application in a user terminal or via a display device of the HEMS. Subsequently, a request can be output to the user to specify the connection mode by one or more inputs. For example, the input can be made interactively, preferably iteratively, by selecting from a list of possible connection modes and / or by answering a series of questions.

[0022] In particular, the HEMS may output a series of queries to the user so that the user may make a series of inputs. Here, for example, the presence of specific components and / or their quantity and / or their relative arrangement with respect to other components may be queried individually in sequence. Based on the user's input, a limited selection of possible connection modes may be proposed, or a single suitable connection mode may be determined. The series of queries may be set up iteratively so that each individual query may have an influence on a subsequent query or selection option.

[0023] The HEMS may then determine and propose or provide a suitable connection mode based on the user's input.

[0024] For example, the user can input by selecting a single component in a displayed list or graphical interface. In addition, the user can select from multiple provided connection modes. Here, the HEMS can pre-select based on the components that have been detected to facilitate user selection, where the HEMS can display multiple possible connection modes.

[0025] The automatic detection of the component can be realized by acquiring at least one signal from at least one component of the electric energy system. For example, the signal can be transmitted wirelessly from the component and received by the HEMS. Alternatively, the signal can also be transmitted in a wired manner. For example, the establishment of a plug connection between a control line of the component and the HEMS can be automatically detected.

[0026] Preferably, the HEMS can detect at least one component based on the acquired signal. In particular, the HEMS detects the structural type and / or the device type of the component. Furthermore, in this case, the operating state of the component can already be acquired.

[0027] The verification of the electrical energy system comprises the step of setting the electrical energy system to a first operating state by actuating at least one first component. The HEMS then acquires at least one measured value in the first operating state. The measured value can in particular be generated by an electric meter and transmitted to the HEMS. The HEMS then performs a plausibility check based on the at least one measured value and the provided connection mode. Within the scope of the plausibility check, it is checked whether the acquired measured value corresponds to the provided circuit mode.

[0028] Preferably, the driving component may include a set power consumption or power output caused by the component. For example, the set power consumption or power output may be obtained by a corresponding change in a measured value at one of the measuring devices and compared with the provided value. Thereby, among other things, information about the relative position of the component compared to the measuring device and other components may be determined. Furthermore, the correct functioning of the component and its driving may be verified.

[0029] The HEMS outputs a signal depending on the result of the plausibility check. For example, the signal is a message output to the user via the human-machine interface. The message can indicate whether the connection mode is plausible. Thus, the message can in particular be a success message or an error message.

[0030] According to a preferred embodiment, the step of outputting a signal comprises outputting a message to a user based on the result of the plausibility check, comprising a suggestion for an alternative connection mode, wherein the alternative connection mode describes a different arrangement of components of the electrical energy system and their relative position and connection.

[0031] In particular, if the plausibility check shows that the proposed connection mode does not correspond to the acquired measured values, a suggestion for an alternative, plausible connection mode can be output. The user can then accept the suggestion by a corresponding input. Subsequently, a revalidation is preferably performed.

[0032] The signal can be output in various ways. In particular, the signal can be transmitted in the form of a message to a terminal of a user and / or operator of the energy system. Additionally or alternatively, the signal can be displayed as an indication on a display device on or near the HEMS. Furthermore, additionally or alternatively, the signal can be a regulating signal or control signal that the HEMS can output to a component of the energy system, in particular in order to carry out a regulating intervention and / or in order to change the operating state of the energy system.

[0033] Preferably, the output signal may include an error message sent to a user and / or operator of the energy system. In particular, the error message may be output to a mobile terminal of the user and / or operator. For example, the error message may indicate that the verification shows that the provided connection mode does not correspond to the acquired measurement value.

[0034] The verification may comprise a further step, wherein the electrical energy system is set into a second operating state by driving the first component and / or by driving the second component, wherein at least one further measured value is acquired in the second operating mode.

[0035] Thus, a plausibility check can be performed based on the first measured value in the first operating state and based on the second measured value in the second operating state. Thus, the plausibility of the provided connection mode can be checked more accurately, in particular if a plurality of connection modes are plausible only under the measured values ​​in the first operating state. Thus, the number of possible plausible connection modes can be reduced.

[0036] The preferred electrical energy system has a controllable load as a first component and a corresponding electric meter for measuring the consumption of the controllable load. Thus, the HEMS can drive the first component by sending a power consumption command to the controllable load. The power consumption command can provide a power consumption (or power consumption of the load) equal to zero or greater than zero. A power consumption command equal to zero can also be called a shutdown command.

[0037] According to a preferred embodiment, the at least one measurement value may be obtained by receiving a measured consumption of the controllable load from an electricity meter, and a plausibility check may be performed by comparing the measured consumption with the transmitted power consumption command.

[0038] Preferred electrical energy systems have a controllable energy store and / or a generator as the first or second component and a corresponding electricity meter for measuring the electrical power output of the energy store or the generator.

[0039] According to a preferred embodiment, the HEMS can drive the first component by sending a power output command to the energy storage and / or the generator. The HEMS obtains at least one measurement value by receiving a measured output of the energy storage and / or the generator from an electric meter and performs a plausibility check by comparing the measured output with the transmitted power output command.

[0040] In a preferred method, the HEMS acquires first measured values ​​from a first meter at a grid connection point (NAP), via which electrical energy can be drawn from a public grid and / or fed into a public grid. Furthermore, the HEMS can acquire at least one second measured value from at least one second meter. The at least one second meter measures, for example, the consumption of a controllable load and / or the power output of an energy storage device and / or the power output of a generator.

[0041] Furthermore, the HEMS may determine the consumption of the uncontrollable load based on the difference between the first measurement value and the second measurement value.Thus, a plausibility check may be performed based on the first measurement value, the second measurement value and the provided connection mode.

[0042] According to a preferred embodiment, the method comprises the step of transmitting the data from the HEMS to a cloud or a server. The cloud or the server may be geographically remote from the building with the energy system. The data may be stored in the cloud or in a storage device of the server in order to be used, for example, for evaluation. The cloud or the server may evaluate the data set, in particular for the purpose of a plausibility check.

[0043] Based on the calculation result, the cloud or server can output a signal, for example to a mobile terminal of a user or operator of the energy system. The mobile terminal can receive the signal, in particular via an Internet connection.

[0044] The electrical energy system may also include at least one renewable energy source, such as a photovoltaic system (PV system) or a wind turbine, which is configured to provide energy to (controllable and uncontrollable) loads and energy storage devices. Photovoltaic systems usually have an inverter in order to convert the direct current generated by the PV system into alternating current. For example, the inverter can be controlled by a HEMS. In addition, the PV system can have a separate meter to measure the energy generated by the PV system. In particular, part of the generated energy can be used to charge the energy storage device. In addition, energy can be fed from the PV system into the public grid via the grid connection point. The fed-in energy is preferably measured by a counter at the grid connection point to calculate the compensation.

[0045] The HEMS is preferably configured to perform some or all method steps of the method according to the invention described herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Further advantageous embodiments are described in more detail below based on the exemplary embodiments shown in the drawings, but the invention is not restricted thereto.

[0047] In the attached picture:

[0048] Figure 1 An electrical energy system in a building according to an exemplary embodiment of the present invention is shown.

[0049] Figure 2Three exemplary connection modes A, B and C are shown.

[0050] Figure 3 An electrical energy system in a building according to connection mode B is shown. DETAILED DESCRIPTION

[0051] In the following description of preferred embodiments of the present invention, the same reference symbols denote the same or similar components.

[0052] Figure 1 A schematic diagram of an exemplary embodiment of an electrical energy system 1 according to the invention in a building is shown. The building may be a residential building or an office building.

[0053] Figure 1 The energy system 1 shown comprises a photovoltaic system PV (hereinafter also referred to as a PV system) which converts radiation energy from the sun S into electrical energy. Instead of or in addition to the PV system, the energy system 1 may also use other renewable energy sources, such as wind turbines and / or fuel cells.

[0054] The inverter WR converts the direct current generated by the photovoltaic system into alternating current and outputs it to the internal local network 4 of the building. A plurality of uncontrollable loads HH, a heat pump WP as a controllable load, a charging station or wall box L for an electric vehicle EV as a controllable load, and an energy storage device BAT as a controllable load can be supplied with electrical energy via the local network 4.

[0055] The solid lines here symbolize the power lines of the local network 4 of the building. The dashed lines represent the communication lines 5 for data traffic, in particular between the load or generator and the HEMS used as a control or regulation device. For example, the communication lines 5 transmit control signals, regulation signals and / or measurement signals. For example, these signals are used to acquire measured values ​​and / or for control or regulation and / or for data exchange with a server 2 or with the cloud via a network (for example the Internet WWW).

[0056] The local network 4 of the building is connected to the public grid 3 operated by an energy supply company or grid operator via a grid connection point NAP. The electricity meter Z measures the energy consumption (electricity consumption) extracted from the public grid 3 by the local network 4, and the energy input into the public grid 3 by the energy system 1 (or the accumulated power generation over time).

[0057] The electricity meter Z may be a smart meter, which may be connected to the Internet or an intranet. The regulating or controlling device HEMS of the energy system 1 may obtain measured values ​​from the electricity meter Z via the communication line 5. In addition, the energy system 1 may have Figure 1 Other instruments not shown, such as Figure 2 as shown in .

[0058] The energy storage device BAT is used to store electrical energy and can be composed of multiple batteries or rechargeable batteries. The energy storage device BAT includes an inverter (not shown) that converts the AC power from the local network 4 into DC power for charging the energy storage device BAT. In addition, the inverter can convert the DC power from the energy storage device BAT into the AC power required by the local network 4.

[0059] In order to charge the energy storage device BAT with energy from the photovoltaic system, a direct and separate power line can also be provided between the photovoltaic system and the energy storage device BAT, so that the conversion between direct current and alternating current when charging the energy storage device BAT can be omitted. Such a direct direct current line can also be provided between the energy storage device BAT and the charging station L.

[0060] Another component of the energy system 1 is another controllable load, which is shown here as an example by a heat pump WP. The operation of the heat pump WP can be controlled or regulated by the HEMS. The energy system 1 can also include other controllable loads. For example, an electric heating device can be controlled by the HEMS. The electric heating device can in particular be a heating rod of the heat pump WP.

[0061] In addition, ventilation systems and / or air conditioning systems and / or night storage heaters can be provided as controllable loads. Figure 1 The charging station L and the energy storage device BAT can also be operated as controllable loads.

[0062] A plurality of uncontrollable loads HH are connected to the local network 4 of the building. The uncontrollable loads HH are, for example, household appliances and / or lighting devices or other loads that can be switched on and off by users or residents of the building. In an office building, for example, a plurality of computers, printers and / or copiers may exist as uncontrollable loads HH.

[0063] The HEMS is connected via a communication line 5 to the inverter WR of the PV system, the heat pump WP, the energy storage BAT, the electricity meter Z at the grid connection point NAP, the charging station L, and via the Internet WWW to a server 2. Instead of a wired communication line 5, wireless communication or communication via optical waveguides can also be provided (partially) between the HEMS and the mentioned components of the energy system 1. In addition, the energy system 1 can have further electricity meters, which measure, for example, the energy generated by the PV system and / or the energy consumed by the uncontrollable loads HH.

[0064] Figure 2Three exemplary connection modes A, B and C are shown, each with two electricity meters Z1, Z2, a heat pump WP as a controllable load, a PV system as an energy generator and / or an energy storage device BAT as a controllable load or controllable energy source and a plurality of uncontrollable loads HH. In each case, an internal local network 4 is connected to a public grid 3 via a grid connection point NAP. The operating states of the heat pump WP and the PV system and / or the energy storage device BAT can be controlled or regulated by a HEMS (not shown).

[0065] The first electricity meter Z1 can in each case measure the electrical energy consumption from the public grid 3 or the electrical energy fed into the public grid 3. Connection modes B and C each have a third electricity meter Z3 for the PV system or the energy store BAT, which meters the fed-in energy.

[0066] When the electric energy system 1 is commissioned, the connection mode will be verified. It is known that the energy system has a heat pump WP, an energy storage device BAT and a plurality of uncontrollable loads HH. This information can be obtained, for example, by asking a user who can make corresponding inputs. Alternatively, the HEMS can automatically obtain the presence of at least a heat pump WP, an energy storage device BAT and an electric meter Z through corresponding signals. If the HEMS obtains three electric meters Z1, Z2, Z3, the connection mode A can be excluded. Therefore, only the connection modes B and C need to be distinguished.

[0067] To verify the arrangement of the components, the first component can now be driven first. For example, the HEMS can output a power output command to the energy storage device BAT. In both connection mode B and connection mode C, the HEMS obtains a signal from the meter Z3. However, the signals of the meters Z1 and Z2 depend on the operating state of the heat pump WP. In order to distinguish between connection modes B and C, the HEMS can output a power input command to the heat pump WP in the next step.

[0068] Therefore, by comparing the measured values ​​of meters Z1, Z2 and Z3, it is possible to distinguish between connection modes B and C. Furthermore, the consumption of the uncontrollable load HH can be calculated and compared with a predefined range to verify plausibility.

[0069] In a further step, the heat pump WP can be driven by the HEMS via the HEMS output power input command. As a result, both the meter Z1 (connection mode A or C) and the meter Z2 (connection mode B) increase the power consumed by the heat pump WP by several kilowatts. If only the meter Z2 shows the power input of the heat pump, connection modes A and C can be excluded.

[0070] Figure 3 shows the connection mode B Figure 1 A modification of the control system having three instruments Z1, Z2, Z3, a heat pump WP, an energy storage device BAT and a plurality of uncontrollable loads.

[0071] Preferably, the automatic verification of the connected components of the energy system 1 can be performed by the HEMS. The HEMS can be implemented here as part of one of the connected components, as a separate functional unit and / or in the cloud or in the server 2.

[0072] Before or during commissioning of the energy system 1 or if the energy system 1 is modified and recommissioned, the user can make an input in a method step to provide a connection model or a transmission (particularly wireless transmission) of the connection model to the HEMS can take place.

[0073] The plausibility of the set connection mode is then checked by the verification method according to the invention. The method steps can be stored locally in the HEMS or transmitted from the cloud or server 2. The permissible result range can also be transmitted via the network WWW and / or compared with the result range stored in the database in the cloud or server 2, since the measured values ​​are sent from the HEMS to the cloud or server 2 via the network WWW.

[0074] In one step of the method, the verification method can be initiated by the HEMS. In this case, for example, control commands can be sent to the components and the resulting measured values ​​can be monitored and analyzed.

[0075] In particular, the driven component can send feedback to the HEMS about which operating state currently exists and / or which power is currently being generated or consumed. In addition, the energy previously generated and / or consumed during the verification method can be obtained, regardless of whether the command received from the HEMS is being executed or has been executed, or which measurement has been performed or which power and / or energy consumption has resulted. This information and other information can be transmitted from the corresponding component to the HEMS and / or the HEMS calculates this information based on the acquired measurement values.

[0076] To verify the connection mode, in particular, the HEMS can generate artificial demand requests (power consumption or power output). These commands can include, for example: power requests and / or deregulation requests for generators or loads or storage BAT. An SGReady signal is sent to the controllable loads and control commands are optionally repeated.

[0077] A preferred verification method for an energy system having a PV system comprises in particular a step of transmitting weather data or data relating to radiation intensity, for example from the cloud or acquired by local sensors, a step of calculating a predicted power of the PV system within a predefined time interval, and a step of comparing the power actually delivered within the time interval with the calculated power.

[0078] The preferred verification method for checking the consumption of the uncontrollable load (household load) of the electricity meter comprises in particular the step of determining whether the controllable load is connected to the household electricity in the connection mode, for example, see the load HH and the heat pump WP in the connection mode A behind the counter Z1. By driving the heat pump WP in the connection mode A and obtaining the measured value of the counter Z1, the consumption of the uncontrollable load can also be determined accordingly. By switching the heat pump WP off and on in the connection mode A, conclusions can be drawn about the position of the counter Z1.

[0079] According to §14a EnWG, the preferred verification method for verifying the meter for the heat pump WP, see for example Z2 in connection mode B or Z1 in connection mode C, specifically comprises sending a power consumption command to the heat pump WP, reading the meter and comparing the consumed power with the power consumption command.

[0080] For example, the verification method can determine counters that are dependent on each other. For example, these are sequentially connected instrument cascades, such as Z1 and Z2 in connection mode A, Z1 and Z3 in connection mode B, and Z1 to Z3 in connection mode C. In this method, the individual values ​​of the individual counters Z1 to Z3 are determined and compared with each other to determine the sequence of the counters.

[0081] If the connection mode has been successfully verified, the electrical energy system 1 can be commissioned. In contrast, if the verification is unsuccessful, an error message can be output, which can also contain a suggestion for the determined actual connection mode. The user or installer of the energy system can then confirm the newly determined connection mode, so that the energy system 1 can be commissioned with the actual connection mode.

[0082] The features disclosed in the above description, the claims and the drawings can be essential for the realization of the invention in its various embodiments, both individually and in any desired combination.

Claims

1. A method for verifying an electrical energy system (1) in a building, comprising the following steps: Providing a connection pattern of the electric energy system (1), wherein the connection pattern describes the arrangement of multiple components of the electric energy system (1) and their relative positions and connections; Setting the electric energy system (1) to a first operating state by driving at least one first component; acquiring at least one measurement value in the first operating state; performing a plausibility check based on the at least one measured value and the provided connection mode; as well as Output signal depending on the result of the plausibility check.

2. The method according to claim 1, further comprising: Setting the electrical energy system (1) to a second operating state by driving the first component and / or by driving the second component; acquiring at least one measurement value in the second operating state; as well as A plausibility check is performed based on the measured values ​​in the first and second operating state and the provided connection mode.

3. The method according to claim 1 or 2, wherein providing the connection mode comprises: Start the human-machine interface; outputting, via input, to a user a request to specify the connection mode; as well as The connection mode is provided according to a user input.

4. The method according to any one of claims 1 to 3, further comprising: Acquiring at least one signal from at least one component of the electrical energy system (1); identifying the at least one component based on the acquired signal; as well as Outputs multiple possible connection modes.

5. The method according to any one of claims 1 to 4, wherein the electrical energy system (1) has as a first component a controllable load (WP) and an electric meter (Z) for measuring the consumption of the controllable load (WP.), the method further comprising: driving the first component by sending a power consumption command to the controllable load (WP); acquiring at least one measurement value by receiving from said electricity meter (Z) a measured consumption of said controllable load (WP); as well as A plausibility check is performed by comparing the measured consumption with the transmitted power consumption commands.

6. The method according to any one of claims 1 to 4, wherein the electrical energy system (1) has as a first component a controllable energy storage device (BAT) and / or a generator (PV) and an electric meter (Z) for measuring the electric power output of the energy storage device (BAT) or the generator (PV), and the method comprises: driving the first component by sending a power output command to the energy storage device (BAT) and / or the generator (PV); Acquiring at least one measurement value by receiving from an electricity meter (Z) a measured output of said energy storage device (BAT) and / or of a generator (PV); as well as A plausibility check is performed by comparing the measured output to the transmitted power output command.

7. The method according to any one of claims 1 to 6, wherein: The first measured value is acquired by a first electricity meter (Z1) at a grid connection point (NAP), via which electrical energy can be drawn from a public grid (3) and / or fed into the public grid (3); The second measurement value is obtained by the second electricity meter (Z2), where: Measuring the consumption of the controllable load (WP); or Measuring the output of the energy storage device (BAT); or Measuring the output of the generator (PV); and determining the consumption of the uncontrollable load (HH) based on the difference between said first measurement and said second measurement; and A plausibility check is performed based on the first measured value, the second measured value and the provided connection mode.

8. The method according to any one of claims 1 to 7, wherein: The steps of outputting the signal include: Depending on the result of the plausibility check, a message is output to the user containing a suggestion for an alternative connection mode, wherein the alternative connection mode describes a different arrangement of components of the electrical energy system (1) and their relative positions and connections.

9. An electrical energy system (1) in a building, comprising: a network connection point (NAP) via which electrical energy can be drawn from the public grid (3) and / or fed into the public grid (23); Multiple uncontrollable loads (HH); Controllable load (WP); Energy storage (BAT) and / or generator (PV); Electricity meter (Z), used to measure the consumed and / or output electrical power; as well as control device (HEMS) for regulating and / or controlling a controllable load (WP) and / or an energy store (BAT) and / or a generator (PV), Wherein, the control device (HEMS) is configured as follows: A connection pattern of an electric energy system (1) is provided, wherein the connection pattern describes the arrangement of a network connection point (NAP), a plurality of uncontrollable loads (HH), a controllable load (WP), an energy storage device (BAT) and / or a generator (PV) and their relative positions and connections; transmitting a power consumption or power output command to the controllable load (WP) and / or the storage (BAT) and / or the generator (PV), thereby setting the electrical energy system (1) to a first operating state; receiving a measurement of the consumed or output electrical power from said electricity meter (Z); performing a plausibility check by comparing the measured consumption with the power consumption command or comparing the measured power output with the power output command, depending on the connection mode provided; and Output signal depending on the result of the plausibility check.

10. The electric energy system (1) according to claim 9, further comprising: Heat pump (WP) as a controllable load; and / or Electrical devices for heating water as a controllable load; and / or Energy storage (BAT) as a controllable load and / or a controllable generator.

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