JP6465607B2 - Power measuring apparatus and voltage system discrimination method - Google Patents

Description

  The present invention relates to a power measurement device and a voltage system discrimination method.

  Electric power is often supplied to a general household from a single-phase three-wire power source. The single-phase three-wire power source includes a voltage line L1 for applying an AC voltage of 100V, a voltage line L2 for applying an AC voltage of 100V in an opposite phase to the voltage line L1, and a neutral line N. Power is supplied through the main circuit. The single-phase three-wire power supply generally has three voltage systems (a first voltage system composed of a voltage line L1 and a neutral line N, a first voltage system composed of a voltage line L2 and a neutral line N). 2 voltage systems, and a third voltage system composed of voltage lines L1 and L2.

  Usually, a plurality of branch circuits composed of a pair of wirings are connected to the main circuit. When supplying a power supply voltage of 100 V by a branch circuit, one of the pair of wirings constituting the branch circuit is connected to the voltage line L1 or the voltage line L2, and the other is connected to the neutral line N. When a power supply voltage of 200 V is supplied by a branch circuit, one of the pair of wirings constituting the branch circuit is connected to the voltage line L1, and the other is connected to the voltage line L2.

  Various techniques for measuring the power consumption of each of the power supplied from the single-phase three-wire power supply through each of the main circuit and the plurality of branch circuits have been proposed (see, for example, Patent Document 1).

  For example, the power consumption of the electrical device connected to the first voltage system via the branch circuit is measured based on the voltage of the voltage line L1 and the current flowing through the branch circuit to which the electrical device is connected. The power consumption of the electrical device connected to the second voltage system via the branch circuit is measured based on the voltage of the voltage line L2 and the current flowing through the branch circuit to which the electrical device is connected. The power consumption of the electrical device connected to the third voltage system via the branch circuit is based on the voltage in both the voltage line L1 and the voltage line L2 and the current flowing through the branch circuit to which the electrical device is connected. , Measured.

  Therefore, in order to measure the power consumption of the electrical device connected to the branch circuit, it is necessary to set in advance which of the three voltage systems the electrical device is connected via the branch circuit.

JP 2000-284005 A

  However, the setting of the voltage system to which the electrical equipment is connected has not yet been automated, and is manually performed by a setting person such as a contractor or a user. Few techniques have been proposed to support setting by the setter. Therefore, it takes time to set the voltage system to which the electrical equipment is connected.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a power measuring device that facilitates setting of a voltage system to which an electrical device is connected.

In order to achieve the above object, a power measuring device according to the present invention is
A first current and a second current flowing in each of the first voltage line and the second voltage line constituting a plurality of voltage systems, and a wiring to which an electric device is connected, and a branch connected to one of the voltage systems A current measuring unit for measuring a third current flowing through the circuit;
Based on each current measured by the current measuring unit, it is determined whether or not there is a correlation between the first current and the third current and whether there is a correlation between the second current and the third current. A correlation determination unit;
A system discriminating unit that discriminates a voltage system to which the branch circuit is connected based on a result determined by the correlation determining unit.
The correlation determination unit
A fluctuation identifying unit that identifies a time when the third current measured by the current measuring unit fluctuates more than a first threshold;
Whether there is a correlation between the first current and the third current based on whether the first current measured by the current measuring unit has fluctuated more than a second threshold at the time specified by the fluctuation specifying unit A first determination unit for determining whether or not;
Whether there is a correlation between the second current and the third current based on whether the second current measured by the current measuring unit has fluctuated more than a third threshold at the time specified by the fluctuation specifying unit And a second determination unit for determining whether or not.

According to the present invention, based on the first current, the second current, and the third current, it is determined whether or not there is a correlation between each of the first current and the second current and the third current. Based on the determination result, the voltage system to which the branch circuit is connected is determined. Thus, the result of the determine specific, with reference to the electrical device connected to the branch circuit, automatically or manually, can be electrical device via the branch circuit sets the connected voltage system. Accordingly, it is possible to easily set the voltage system to which the electric device is connected.

It is a figure which shows the structure of the circuit to which the electric power measurement apparatus which concerns on Embodiment 1 of this invention is connected. 1 is a diagram illustrating a configuration of a power measurement device according to a first embodiment. It is a figure which shows an example of current data. 3 is a diagram showing a configuration of a correlation determination unit according to Embodiment 1. FIG. It is a figure which shows an example of connection system | strain data. 4 is a flowchart showing a flow of voltage system discrimination processing according to the first embodiment. 4 is a flowchart showing a flow of correlation determination processing according to the first embodiment. 4 is a flowchart showing a flow of correlation determination processing according to the first embodiment. It is a figure which shows an example of the variation | change_quantity calculated about a 3rd electric current. It is a figure which shows an example of the variation | change_quantity calculated about a 1st electric current and a 2nd electric current. 3 is a flowchart showing a flow of system discrimination processing according to the first embodiment. 3 is a flowchart showing a flow of power consumption measurement processing according to the first embodiment. It is a figure which shows the structure of the electric power measuring apparatus which concerns on the modification 1. It is a figure which shows the structure of the correlation determination part which concerns on the modification 1. FIG. 10 is a flowchart showing a flow of voltage system discrimination processing according to Modification Example 1. 10 is a flowchart showing a flow of correlation determination processing according to Modification 1. It is a figure which shows the structure of the circuit to which the power measuring device which concerns on Embodiment 2 of this invention is connected. It is a figure which shows the structure of the electric power measuring apparatus which concerns on Embodiment 2. FIG. FIG. 10 is a diagram illustrating a configuration of a correlation determination unit according to Embodiment 2. 6 is a flowchart showing a flow of voltage system discrimination processing according to the second embodiment. 6 is a flowchart showing a flow of correlation determination processing according to the second embodiment. 6 is a flowchart showing a flow of correlation determination processing according to the second embodiment. It is a figure which shows the structure of the electric power measuring apparatus which concerns on the modification 2. It is a figure which shows the structure of the correlation determination part which concerns on the modification 2. 10 is a flowchart showing a flow of voltage system determination processing according to Modification 2. 10 is a flowchart showing a flow of correlation determination processing according to Modification 2. It is a figure which shows the structure of the electric power measurement apparatus which concerns on Embodiment 3 of this invention. FIG. 10 is a diagram illustrating a configuration of a correlation determination unit according to Embodiment 3. It is a figure which shows the structure of the electric power measuring apparatus which concerns on the modification 3. It is a figure which shows the structure of the correlation determination part which concerns on the modification 3. It is a figure which shows the structure of the electric power measurement apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the structure of the correlation determination part which concerns on Embodiment 4. FIG. It is a figure which shows the structure of the electric power measuring apparatus which concerns on the modification 4. It is a figure which shows the structure of the correlation determination part which concerns on the modification 4.

  Embodiments of the present invention will be described below with reference to the drawings. The same elements are denoted by the same reference symbols throughout the drawings.

Embodiment 1 FIG.
As shown in FIG. 1, the power measuring apparatus 100 according to the first embodiment of the present invention measures the power consumption of the device A101 and the device B102 connected to any of the three voltage systems of the single-phase three-wire power source. Device. The device A101 and the device B102 according to the present embodiment are an air conditioner and a television receiver (television), respectively.

  As shown in the figure, the single-phase three-wire power source is a main circuit composed of a voltage line L1 (first voltage line), a voltage line L2 (second voltage line), and a neutral line N (third voltage line). Power is supplied through 103. The voltage line L1 and the voltage line L2 are wirings for applying a voltage to the device A101 and the device B102, and for example, an AC voltage of 100 V is applied in reverse phase.

  The single-phase three-wire power source includes a first voltage system composed of the voltage line L1 and the neutral line N, a second voltage system composed of the voltage line L2 and the neutral line N, and the voltage line L1 and the voltage line. It has three voltage systems called the 3rd voltage system comprised by L2.

  The single-phase three-wire power source is an example of a power source having a plurality of voltage systems configured by a plurality of voltage lines. Such a power source is not limited to a single-phase three-wire power source, and may be a three-phase three-wire power source, for example.

  As shown in the figure, the main circuit 103 includes a main circuit breaker 104 that switches between connection and disconnection of the main circuit 103, and a current sensor (current transformer) for measuring the current flowing through each of the voltage line L1 and the voltage line L2. ) CT1 and CT2 are provided.

  The current sensor CT1 and the current sensor CT2 are provided on the voltage line L1 and the voltage line L2, respectively. Specifically, the current sensor CT1 is arranged in association with the voltage line L1, and outputs a current signal corresponding to the magnitude of the current (first current) flowing through the voltage line L1. The current sensor CT2 is disposed in association with the voltage line L2, and outputs a current signal corresponding to the magnitude of the current (second current) flowing through the voltage line L2.

  Further, two branch circuits (first branch circuit 105a and second branch circuit 105b) are connected to the main circuit 103. Each of the branch circuits 105a and 105b is composed of two paired branch wirings, one branch wiring is electrically connected to the voltage line L1 or voltage line L2, and the other branch wiring is connected to the neutral line N. Electrically connected.

  In the present embodiment, as shown in the figure, the device A101 is connected to the first branch circuit 105a, and the branch wiring of the first branch circuit 105a includes the voltage line L1 and the neutral line N (that is, Connected to the first voltage system). The device B102 is connected to the second branch circuit 105b, and the branch wiring of the second branch circuit 105b is connected to the voltage line L2 and the neutral line N (that is, the second voltage system).

  As shown in the figure, each of the branch circuits 105a and 105b is provided with branch breakers 106a and 106b for switching between connection and disconnection of the branch circuits 105a and 105b, and current sensors (current transformers) CT3 and CT4. It has been.

  The current sensor CT3 and the current sensor CT4 are respectively provided on one of the branch wirings (the wiring connected to the voltage line L1 or the voltage line L2) constituting the branch circuits 105a and 105b. Thereby, the current sensor CT3 and the current sensor CT4 output current signals corresponding to the magnitudes of the currents (third currents) flowing through the first branch circuit 105a and the second branch circuit 105b, respectively.

  Specifically, the current sensor CT3 is arranged in association with the branch wiring connected to the voltage line L1 among the two branch wirings constituting the first branch circuit 105a. In the present embodiment, since the device A101 is connected to the first branch circuit 105a, the current sensor CT3 outputs a current signal corresponding to the magnitude of the third current flowing to the device A101.

  The current sensor CT4 is arranged in association with the wiring connected to the voltage line L2 among the two wirings constituting the second branch circuit 105b. In the present embodiment, since the device B102 is connected to the first branch circuit 105b, the current sensor CT4 outputs a current signal corresponding to the magnitude of the third current flowing to the device B102.

  Although not shown, in the case of a branch circuit connected to the third voltage system, the currents (third currents) flowing through the two wirings constituting the branch circuit are usually equal. Therefore, the current sensor is arranged in association with only one of the two wirings (for example, only the wiring connected to the voltage line L1). The current sensor outputs a current signal corresponding to the magnitude of the third current flowing in the branch circuit connected to the third voltage system. In this case, the current sensor may be provided on both of the two wires constituting the branch circuit.

  The number of branch circuits is not limited to two and may be any number. Further, the device A101 and the device B102 are examples of electrical devices that are connected to any one of a plurality of voltage systems via a branch circuit. The number of such electrical devices is not limited to two and may be any number. Such an electric device is not limited to an air conditioner or a television, and may be a lighting device, an electric water heater, a washing machine, an electromagnetic cooker, or the like.

  As shown in FIG. 1, the power measuring device 100 is connected to an operation terminal 107 for a user to operate the power measuring device 100 via a communication line configured by wire, wireless, or a combination thereof. ing. The operation terminal 107 is, for example, a tablet terminal in which a dedicated software program is installed, a smart phone, a notebook personal computer, or the like. Accordingly, the user can give various instructions or set various information to the power measurement apparatus 100 through the operation terminal 107. In addition, the user can know the result of the power measurement apparatus 100 executing various processes such as power consumption from information displayed on the display unit of the operation terminal 107, for example. Note that the user interface included in the operation terminal 107 may be included in the power measurement apparatus 100.

  As shown in FIG. 2, functionally, the power measuring apparatus 100 includes a current (current value) flowing through each of the voltage line L1 and the voltage line L2 where the current sensors CT1 and CT2 are arranged, and current sensors CT3 and CT4. A current measuring unit 111 that measures a current flowing through each of the branch circuits 105a and 105b including the arranged branch wiring, a current storage unit 113 that stores current data 112 indicating the current measured by the current measuring unit 111, and A voltage measurement unit 114 that measures the voltage (voltage value) of each of the voltage line L1 and the voltage line L2, a voltage storage unit 116 that stores voltage data 115 indicating the voltage measured by the voltage measurement unit 114, and a first current And a correlation determination unit 117 that determines whether or not there is a correlation between each of the second current and the third current, and based on the result determined by the correlation determination unit 117, A system discriminating unit 118 that discriminates the voltage system to which the circuits 105a and 105b are connected, a connection system storage unit 120 that stores connection system data 119 indicating a result discriminated by the system discriminating unit 118, and the devices A101 and B102. A power consumption measuring unit 121 that measures each power consumption, and a power consumption storage unit 123 that stores power consumption data 122 indicating the power consumption measured by the power consumption measuring unit 121 are provided.

  For example, the current measurement unit 111 continuously acquires a current signal from each of the current sensors CT1 to CT4 while the power measurement device 100 is operating.

  The current measuring unit 111 measures the first current flowing through the voltage line L1 based on the current signal acquired from the current sensor CT1, and generates current data 112 indicating the magnitude of the first current in time series. The current measurement unit 111 measures the second current flowing through the voltage line L2 based on the current signal acquired from the current sensor CT2, and generates current data 112 indicating the magnitude of the second current in time series.

  The current measuring unit 111 measures the third current flowing through the first branch circuit 105a based on the current signal acquired from the current sensor CT3, and generates current data 112 indicating the magnitude of the third current in time series. . The current measuring unit 111 measures the third current flowing through the second branch circuit 105b based on the current signal acquired from the current sensor CT4, and generates current data 112 indicating the magnitude of the third current in time series. .

  The current measurement unit 111 outputs each of the generated current data 112 to the current storage unit 113.

  When the current storage unit 113 acquires the current data 112 from the current measurement unit 111, the current storage unit 113 stores the current data 112.

  Here, an example of the current data 112 is shown in FIG. FIG. 3 shows current data 112c for current data 112a for the first current, current data 112b for the second current, and third current flowing through the first branch circuit 105a (ie, current flowing to the device A101). An example of

  As shown in FIG. 2, the voltage measurement unit 114 measures the voltage between the voltage line L1 and the neutral line N as the voltage (first voltage) of the voltage line L1. In addition, the voltage measuring unit 114 measures the voltage between the voltage line L2 and the neutral line N as the voltage (second voltage) of the voltage line L2. The voltage measuring unit 114 generates voltage data 115 indicating the magnitudes of the first voltage and the second voltage in time series. The voltage measurement unit 114 outputs each of the generated voltage data 115 to the current storage unit 113.

  When the voltage storage unit 116 acquires the voltage data 115 from the voltage measurement unit 114, the voltage storage unit 116 stores the voltage data 115.

  When receiving an instruction from the operation terminal 107, for example, the correlation determination unit 117 determines whether there is a correlation between the first current and the third current based on each current measured by the current measurement unit 111, the second current, and the second current. It is determined whether or not there is a correlation between the three currents.

  Here, the third current is a current flowing through the branch circuit 105a or 105b as described above. Therefore, when a plurality of branch circuits 105 a and 105 b are connected to the main circuit 103, a plurality of third currents are measured by the current measuring unit 111. In such a case, for which of the third currents the correlation determination unit 117 determines whether or not there is a correlation with each of the first current and the second current may be specified by an instruction from the operation terminal 107, for example. .

  The third current to be determined by the correlation determining unit 117 may be specified by any method. For example, as described above, since the third current is a current flowing through the branch circuit 105a or 105b, the object of determination by the correlation determination unit 117 is determined by information identifying each of the first branch circuit 105a and the second branch circuit 105b. The third current can be specified. Further, for example, since the third current is a current that flows to the device A101 and the device B102 via the branch circuits 105a and 105b, the object to be determined by the correlation determination unit 117 based on the information that identifies each of the device A101 and the device B102. The third current can be specified.

  Moreover, the period (correlation determination period) in which the first current, the second current, and the third current for determination by the correlation determination unit 117 may be determined as appropriate. The correlation determination period is, for example, between a time when an instruction from the operation terminal 107 is received and a predetermined time before that time. Further, for example, the correlation determination period is specified by an instruction from the operation terminal 107.

  Specifically, as shown in FIG. 4, the correlation determination unit 117 according to the present embodiment includes a fluctuation specifying unit 124 that specifies a time (fluctuation time) when the third current fluctuates more than the first threshold, and the first current A first determination unit 125 that determines whether or not the first current and the third current have a correlation based on whether or not the first current and the third current have a correlation based on whether or not the second current has fluctuated more than a second threshold value. And a second determination unit 126 that determines whether or not there is a correlation between the second current and the third current based on whether or not the fluctuation has occurred by a threshold value or more.

  The fluctuation specifying unit 124 acquires the current data 112c of the correlation determination period for the third current specified by the instruction from the operation terminal 107 from the current storage unit 113. Thereby, the fluctuation specifying unit 124 acquires the third current measured by the current measuring unit 111 during the correlation determination period. The fluctuation specifying unit 124 calculates a fluctuation amount (for example, a differential value of the current) at each time of the acquired third current. The variation specifying unit 124 compares each variation amount calculated for the third current with the first threshold value. The fluctuation specifying unit 124 specifies the time when the fluctuation amount is equal to or greater than the first threshold as the fluctuation time.

  The first determination unit 125 acquires the current data 112a of the correlation determination period for the first current from the current storage unit 113. Thereby, the first determination unit 125 acquires the first current measured by the current measurement unit 111 during the correlation determination period. The first determination unit 125 calculates the fluctuation amount of the acquired first current at the fluctuation time. The first determination unit 125 compares the fluctuation amount calculated for the first current with the second threshold value. The first determination unit 125 determines that there is a correlation between the first current and the third current when the fluctuation amount of the first current is equal to or greater than the second threshold. The first determination unit 125 determines that there is no correlation between the first current and the third current when the fluctuation amount of the first current is less than the second threshold. The first determination unit 125 outputs data indicating the determination result to the system determination unit 118.

  The second determination unit 126 performs the same process as the first determination unit 125 described above for the second current measured by the current measurement unit 111. Note that either the first determination unit 125 or the second determination unit 126 may execute the process first.

  Specifically, the second determination unit 126 acquires the current data 112b of the correlation determination period for the second current from the current storage unit 113. Thereby, the second determination unit 126 acquires the second current measured by the current measurement unit 111 during the correlation determination period. The second determination unit 126 calculates the fluctuation amount of the acquired second current at the fluctuation time. The second determination unit 126 compares the amount of variation calculated for the second current with the third threshold value. The second determination unit 126 determines that there is a correlation between the second current and the third current when the variation amount of the second current is greater than or equal to the third threshold. The second determination unit 126 determines that there is no correlation between the second current and the third current when the variation amount of the second current is less than the second threshold. The second determination unit 126 outputs data indicating the determination result to the system determination unit 118.

  Here, each of the first threshold, the second threshold, and the third threshold is a value set in advance as appropriate.

  As shown in FIG. 2, when the system determination unit 118 acquires data indicating the determination result from the correlation determination unit 117, the voltage system to which the branch circuit 105a or 105b through which the third current flows is connected based on the data. Is determined.

  Specifically, when the correlation determination unit 117 determines that only the first current and the third current have a correlation, the system determination unit 118 determines that the voltage system to which the branch circuit 105a or 105b is connected is the first voltage system. Determine that there is.

  When the correlation determination unit 117 determines that only the second current and the third current have a correlation, the system determination unit 118 determines that the voltage system to which the branch circuit 105a or 105b is connected is the second voltage system. .

  When the correlation determination unit 117 determines that both the first current and the second current and the third current are correlated, the system determination unit 118 determines that the voltage system to which the branch circuit 105a or 105b is connected is the third voltage. It is determined that it is a system.

  The system discriminating unit 118 includes connection system data 119 including information for specifying the branch circuit 105a or 105b through which the third current flows and the discrimination result, that is, the first voltage system, the second voltage system, or the third voltage system. Is output.

  When the connected system storage unit 120 acquires the connected system data 119 from the system determining unit 118, the connected system storage unit 120 stores the connected system data 119.

  Here, an example of the connection system data 119 is shown in FIG. The connection system data 119 shown in FIG. 5 is an example corresponding to the configuration shown in FIG. 1 and associates information for identifying the first branch circuit 105a with information for identifying the first voltage system. Data and data in which information for identifying the second branch circuit 105b and information for identifying the second voltage system are associated with each other. Here, the connection system data 119 shown in FIG. 5 further associates information for identifying each of the first branch circuit 105a and the second branch circuit 105b with information for identifying the device A101 and the device B102. It has been. This indicates that the device A101 and the device B102 are connected to the first branch circuit 105a and the second branch circuit 105b, respectively, and are set by the user, for example.

  As shown in FIG. 2, when the voltage system to which the branch circuit 105a or 105b is connected is determined by the system determination unit 118, the power consumption measuring unit 121 is connected to the device A101 or the device connected to the branch circuit 105a or 105b. The power consumption of B102 is measured.

  Specifically, the power consumption measuring unit 121 acquires the connection system data 119 from the connection system storage unit 120. The power consumption measurement unit 121 identifies the voltage system to which the branch circuits 105a and 105b are connected based on the acquired connection system data 119.

  The power consumption measurement unit 121 acquires voltage data 115 of the specified voltage system from the voltage storage unit 116. At this time, when the identified voltage system is the first voltage system, the power consumption measuring unit 121 acquires the voltage data 115 for the first voltage. When the identified voltage system is the second voltage system, the power consumption measurement unit 121 acquires voltage data 115 for the second voltage. When the identified voltage system is the third voltage system, the power consumption measurement unit 121 acquires voltage data 115 for both the first voltage and the second voltage.

  The power consumption measuring unit 121 acquires, from the current storage unit 113, current data 112c indicating the third current flowing through the branch circuits 105a and 105b to which the devices A101 and B102 to be measured are connected.

  The power consumption measuring unit 121 multiplies the third current indicated by the acquired current data 112c and the voltage indicated by the voltage data 115 corresponding to the voltage system to which the branch circuits 105a and 105b through which the third current flows are connected. Thereby, the power consumption of the device A101 or the device B102 connected to the branch circuit 105a or 105b through which the third current flows is calculated.

  When the calculated power consumption value is 0 or more, the power consumption measuring unit 121 determines the calculated power consumption as the power consumption of the device A101 or the device B102. When the calculated power consumption value is negative, the power consumption measuring unit 121 inverts the sign of the calculated power consumption and determines the inverted power consumption as the power consumption of the device A101 or the device B102.

  The power consumption measuring unit 121 outputs power consumption data 122 including information for identifying the devices A101 and B102 to be measured and the determined power consumption.

  When acquiring the power consumption data 122 from the power consumption measurement unit 121, the power consumption storage unit 123 stores the power consumption data 122.

  Such a power measurement apparatus 100 is physically configured by combining, for example, one or a plurality of processors, a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, a communication interface, and the like. Good. And the function of the electric power measurement apparatus 100 is good to be implement | achieved by, for example, executing the software program in which each physical component was integrated previously.

  So far, the configuration of power measuring apparatus 100 according to Embodiment 1 of the present invention has been described. From here, operation | movement of the electric power measurement apparatus 100 is demonstrated.

  For example, when receiving an instruction from the operation terminal 107, the power measuring apparatus 100 executes a voltage system determination process for determining a voltage system to which the branch circuit 105a or 105b specified by the instruction is connected.

  FIG. 6 is a flowchart showing a flow of voltage system discrimination processing according to the present embodiment. Hereinafter, an example of determining the voltage system to which the first branch circuit 105a is connected will be described with reference to FIG. When a plurality of branch circuits 105a and 105b are specified by an instruction, power measurement apparatus 100 may repeatedly execute voltage system determination processing described below for each of branch circuits 105a and 105b.

  The correlation determination unit 117 includes a first current and a second current measured during the correlation determination period by the current measurement unit 111, and a third current flowing through the first branch circuit 105a measured during the correlation determination period by the current measurement unit 111. It is determined whether or not there is a correlation with the current (step S101).

  7A and 7B show details of the flow of the correlation determination process (step S101) executed by the correlation determination unit 117. FIG.

  The fluctuation specifying unit 124 acquires the current data 112c of the correlation determination period for the third current from the current storage unit 113. The fluctuation specifying unit 124 calculates a differential value at each time as a fluctuation amount for the third current indicated by the acquired current data 112c. Then, the fluctuation specifying unit 124 specifies a time when the calculated fluctuation amount is equal to or greater than the first threshold, and thereby identifies a time (fluctuation time) when the third current fluctuates more than the first threshold (step S111). .

  FIG. 8 shows an example of the calculation result of the fluctuation amount of the third current flowing through the first branch circuit 105a shown in FIG. When the first threshold is 1.8, for example, the time T1 and the time T2 shown in FIG.

  The fluctuation specifying unit 124 determines whether or not there is a time specified in step S111 (step S112). When it is determined that there is no specified time (step S112; NO), the fluctuation specifying unit 124 determines that both the first current and the third current, and the second current and the third current have no correlation (step). In step S113, data indicating the result of this determination is output, and the correlation determination process (step S101) ends. The correlation determination unit 117 returns to the voltage system determination process.

  When it is determined that there is a specified time (step S112; YES), the first determination unit 125 acquires the current data 112a of the correlation determination period for the first current from the current storage unit 113. The first determination unit 125 calculates, for the first current indicated by the acquired current data 112a, the differential value at the fluctuation time specified in step S111 as the fluctuation amount. And the 1st determination part 125 determines whether the 1st electric current changed more than the 2nd threshold value at the change time by comparing the calculated fluctuation amount with the 2nd threshold value (Step S114).

  When the calculated fluctuation amount is equal to or greater than the second threshold, the first determination unit 125 determines that the first current has fluctuated more than the second threshold at the fluctuation time (step S114; YES). In this case (step S114; YES), the first determination unit 125 determines that there is a correlation between the first current and the third current (step S115), and outputs data indicating the result of this determination.

  Here, FIG. 9 shows an example of the calculation result of the fluctuation amount of the first current shown in FIG. 3 by a solid line. When the second threshold is 1.8, for example, the fluctuation amount of the first current is equal to or greater than the second threshold at time T1 and time T2, which are the fluctuation times specified in step S111, as shown in FIG. is there. Therefore, in the example illustrated in FIG. 9, the second determination unit 126 determines that there is a correlation between the first current and the third current.

  As shown in FIG. 7A, when the calculated fluctuation amount is less than the second threshold, the first determination unit 125 determines that the first current does not fluctuate more than the second threshold at the fluctuation time (step S114; NO). ). In this case, the first determination unit 125 determines that there is no correlation between the first current and the third current (step S116), and outputs data indicating the result of this determination.

  As illustrated in FIG. 7B, the second determination unit 126 acquires the current data 112 b of the correlation determination period for the second current from the current storage unit 113. The second determination unit 126 calculates the differential value at the variation time specified in step S111 as the variation amount for the second current indicated by the acquired current data 112b. And the 2nd determination part 126 determines whether the 2nd electric current changed more than the 3rd threshold value at the change time by comparing the calculated fluctuation amount with the 3rd threshold value (Step S117).

  When the calculated fluctuation amount is equal to or greater than the third threshold value, the second determination unit 126 determines that the second current has fluctuated more than the third threshold value at the fluctuation time (step S117; YES). In this case, the second determination unit 126 determines that there is a correlation between the second current and the third current (step S118), outputs data indicating the result of this determination, and ends the correlation determination process (step S101). To do. The correlation determination unit 117 returns to the voltage system determination process.

  When the calculated fluctuation amount is less than the third threshold value, the second determination unit 126 determines that the second current has not changed more than the third threshold value at the fluctuation time (step S117; NO). In this case, the second determination unit 126 determines that there is no correlation between the second current and the third current (step S119), outputs data indicating the result of this determination, and ends the correlation determination process (step S101). To do. The correlation determination unit 117 returns to the voltage system determination process.

  Here, FIG. 9 shows an example of a calculation result of the fluctuation amount of the second current shown in FIG. When the third threshold is 1.8, for example, the amount of fluctuation of the second current is less than the third threshold at time T1 and time T2, which are the fluctuation times specified in step S111, as shown in FIG. is there. Therefore, in the example illustrated in FIG. 9, the second determination unit 126 determines that there is no correlation between the second current and the third current.

  As illustrated in FIG. 6, when the system determination unit 118 acquires data from the correlation determination unit 117, the system determination unit 118 determines whether the determination result indicated by the data includes a correlation (step S102). When it is determined that there is no correlation between the first current and the third current, the second current and the third current, that is, the data output by executing the process of step S113, or When the data output by executing the processing of step S116 and step S119 is acquired, the system determination unit 118 determines that there is no correlation.

  When it is determined that at least one of the first current, the third current, the second current, and the third current has a correlation, that is, output by executing the processing of step S115 and step S119. If the data output by executing the process of step S115 and step S118 or the data output by executing the process of step S116 and step S118 is acquired, the system discriminating unit 118 It is determined that there is a correlation.

  When it is determined that there is no correlation (step S102; NO), the system discrimination unit 118 notifies the user that the voltage system to which the first branch circuit 105a is connected cannot be discriminated (step S103). ) To finish the voltage system discrimination process. The error processing includes, for example, displaying on the operation terminal 107 that the voltage system to which the first branch circuit 105a is connected cannot be determined.

  When it is determined that there is a correlation (step S102; YES), the system determination unit 118 determines the voltage system to which the first branch circuit 105a is connected based on the determination result indicated by the data acquired from the correlation determination unit 117. A determination is made (step S104).

  FIG. 10 shows details of the flow of the system discrimination process (step S104) executed by the system discrimination unit 118.

  The system determination unit 118 determines whether only the first current and the third current are correlated (step S121).

  Specifically, when the data acquired from the correlation determination unit 117 indicates that the first current and the third current are correlated and the second current and the third current are not correlated, the system determination unit 118 It is determined that only the first current and the third current have a correlation.

  Further, when the data acquired from the correlation determination unit 117 indicates that there is no correlation between the first current and the third current and there is a correlation between the second current and the third current, or the first current and the third current When the current is correlated and the second current and the third current are correlated, the system determination unit 118 determines that only the first current and the third current are not correlated.

  When it is determined that only the first current and the third current are correlated (step S121; YES), the system determining unit 118 determines that the voltage system connected to the first branch circuit 105a is the first voltage system (step). S122).

  In the current data 112 illustrated in FIG. 3, since only the first current and the third current are correlated as described above, the voltage system to which the first branch circuit 105a is connected is determined as the first voltage system.

  When it is determined that only the first current and the third current are not correlated (step S121; NO), the system determination unit 118 determines whether only the second current and the third current are correlated. (Step S123).

  Specifically, when the data acquired from the correlation determination unit 117 indicates that there is no correlation between the first current and the third current and there is a correlation between the second current and the third current, the system determination unit 118 It is determined that only the second current and the third current have a correlation.

  When the data acquired from the correlation determining unit 117 indicates that the first current and the third current are correlated and the second current and the third current are correlated, the system determining unit 118 It is determined that only the current and the third current are not correlated.

  When it is determined that only the second current and the third current are correlated (step S123; YES), the system determination unit 118 determines that the voltage system connected to the first branch circuit 105a is the second voltage system (step). S124).

  When it is determined that only the second current and the third current are not correlated (step S123; NO), the system determination unit 118 determines that the voltage system connected to the first branch circuit 105a is the third voltage system. (Step S125).

  The system determining unit 118 generates connection system data 119 in which the result determined in the process of step S122, step S124, or step S125 is associated with information for identifying the first branch circuit 105a (step S126). ). Thereby, the system discrimination | determination part 118 complete | finishes a system discrimination | determination process (step S104), and returns to a voltage system discrimination | determination process.

  The system determination unit 118 outputs the connected system data 119 generated in step S126 to the connected system storage unit 120. When the connected system storage unit 120 acquires the connected system data 119 from the system determining unit 118, the connected system storage unit 120 stores the connected system data 119. Thereby, the voltage system to which the first branch circuit 105a is connected is set in the power measuring apparatus 100 (step S105), and the system discrimination unit 118 ends the voltage system discrimination process.

  For example, when the voltage system to which the branch circuits 105a and 105b are connected is set in the power measurement apparatus 100, the power measuring device 100 consumes power of the devices A101 and B102 connected to the set branch circuits 105a and 105b. Execute power consumption measurement processing that measures

  FIG. 11 is a flowchart showing a flow of power consumption measurement processing according to the present embodiment. Hereinafter, an example of measuring the power consumption of the device A101 connected to the first branch circuit 105a will be described with reference to FIG.

  As for the power consumption of the device B102, processing similar to the power consumption measurement processing described below, that is, processing in which the device A101 and the first branch circuit 105a are replaced with the device B102 and the second branch circuit 105b is executed. It is measured by.

  The power consumption measuring unit 121 acquires the connection system data 119 from the connection system storage unit 120. The power consumption measuring unit 121 identifies the voltage system to which the first branch circuit 105a is connected based on the acquired connection system data 119 (step S131).

  For example, in the example of the connection system data 119 shown in FIG. 5, the voltage system to which the first branch circuit 105a is connected is specified as the first voltage system.

  The power consumption measuring unit 121 acquires the voltage data 115 of the specified voltage system from the voltage storage unit 116 (step S132).

  For example, when the first voltage system is specified in step S131, the voltage data 115 for the voltage line L1 is acquired as the voltage data 115 of the first voltage system.

  The power consumption measurement unit 121 acquires the current data 112c of the third current flowing through the first branch circuit 105a to which the device A101 is connected from the current storage unit 113 (Step S133).

  The power consumption measuring unit 121 calculates the power consumption of the device A101 by multiplying the value of the voltage and the third current acquired by executing the processing of step S132 and step S133 (step S134).

  The power consumption measuring unit 121 determines whether or not the power consumption calculated in step S134 is 0 or more (step S135).

  When the calculated power consumption value is 0 or more (step S135; YES), the power consumption measuring unit 121 determines the calculated power consumption as the power consumption of the device A101 (step S136).

  When the calculated power consumption value is less than 0 (step S135; NO), the power consumption measuring unit 121 inverts the sign of the power consumption calculated in step S134 (step S137). Here, the method of inverting the sign may be selected as appropriate, and the sign of the negative value is inverted by, for example, multiplying the value by -1 or removing the minus sign from the value.

  The power consumption measuring unit 121 determines the power consumption of which the sign is reversed in step S137 as the power consumption of the device A101 (step S138).

  The power consumption measuring unit 121 outputs power consumption data 122 including information for identifying the device A101 that is a measurement target and the power consumption determined by executing the process of step S136 or step S138. When acquiring the power consumption data 122 from the power consumption measurement unit 121, the power consumption storage unit 123 stores the power consumption data 122 (step S139). Thereby, the power measurement apparatus 100 ends the power measurement process. By repeatedly executing such power consumption measurement processing, the power measurement apparatus 100 can continuously measure the power consumption of the device A101.

  According to the present embodiment, the power measuring apparatus 100 includes the branch circuits 105a and 105b based on the first current flowing in the voltage line L1 and the voltage line L2 and the third current flowing in the branch circuits 105a and 105b. Determine the connected voltage system. As a result, with reference to the determined result and the devices A101 and B102 connected to the branch circuits 105a and 105b, the voltage system to which the devices A101 and B102 are connected is automatically or manually connected to the power measuring device. 100 can be set. Accordingly, it is possible to easily set the voltage system to which the devices A101 and B102 are connected.

  Single-phase three-wire power supplies are widely used for power supply to ordinary households. Therefore, according to the present embodiment, it is possible to easily set the voltage system to which each of the devices A101 and B102 is connected in a general home.

  Generally, a current sensor has a polarity, and when installed, the polarity may be erroneously installed in the wiring. If a current sensor is installed with a wrong polarity, the current detected by the current sensor will be 180 degrees out of phase with the actual current. For this reason, the power consumption of the electrical device calculated using the current signal from the current sensor installed with the wrong polarity has a correct absolute value and a negative sign.

  In general, even when a voltage system to which an electrical device is connected is mistakenly set, the sign of the power consumption of the electrical device is negative. For example, when the connection destination of the device A101 is set to the second voltage system, the power consumption of the device A101 is the voltage of the voltage line L2 (phase shifted by 180 degrees from the voltage line L1) and the current sensor CT3. Calculated from the current based on. Therefore, the sign of the power consumption of the device A101 calculated in this case is negative. In this case, the absolute value is incorrect.

  Thus, conventionally, when the sign of the power consumption of the electrical device is negative, the first case in which the polarity is wrong when the current sensor is installed and the second case in which the setting of the voltage system to which the electrical device is connected is wrong These two cases are assumed. And in the case of the 2nd case, even if it calculates | requires the absolute value of the calculated power consumption, the correct power consumption of an electric equipment cannot be obtained. Therefore, conventionally, when the power consumption of an electrical device is negative, it is impossible to obtain the correct power consumption of the electrical device by simply obtaining the absolute value.

  According to the present embodiment, the voltage system to which each of the device A 101 and the device B 102 is connected can be determined almost correctly and set in the power measuring apparatus 100. Therefore, when the power consumption of the device A101 (device B102) becomes a negative value, it can be considered that the current sensor is installed with a wrong polarity, and the device A101 (device B102) is obtained by obtaining the absolute value. ) Correct power consumption can be obtained. Accordingly, it is possible to detect a polarity error at the time of installation of the current sensor CT3 (CT4) and automatically correct the power consumption correctly.

  Although the first embodiment of the present invention has been described above, the first embodiment may be modified as follows.

Modification 1
In the first embodiment, the example in which the presence / absence of the correlation between each of the first current and the second current and the third current is determined based on the fluctuation amount of each current is described. The method is not limited to this.

  In this modification, as another example of the method for determining the presence / absence of correlation between each of the first current and the second current and the third current, the presence / absence of these correlations is determined based on each of the first current and the second current An example in which determination is made based on the correlation coefficient with the third current will be described.

  As shown in FIG. 12, power measurement apparatus 200 according to the present modification is substantially the same as in Embodiment 1 except that correlation determination unit 117 according to Embodiment 1 is provided with correlation determination unit 217. The configuration is provided.

  Correlation determination unit 217 receives the first current and third current based on each current measured by current measurement unit 111 when receiving an instruction from operation terminal 107, for example, similarly to correlation determination unit 117 according to the first embodiment. It is determined whether there is a correlation between the currents and whether there is a correlation between the second current and the third current.

  The correlation determination unit 217 is different in detailed configuration from the correlation determination unit 117 according to the first embodiment. As shown in FIG. 13, the first determination unit 125 and the second determination unit 126 according to the first embodiment Instead of each, a first determination unit 225 and a second determination unit 226 are provided. Note that the correlation determination unit 217 does not have to include the fluctuation specifying unit 124.

  The first determination unit 225 compares the first current and the third current by comparing the correlation coefficient (first correlation coefficient) of the first current and the third current measured by the current measurement unit 111 with the fourth threshold value. It is determined whether the current has a correlation. Here, the fourth threshold is a value set in advance as appropriate.

  Specifically, the first determination unit 225 uses the current data 112c of the correlation determination period for the third current specified by the instruction from the operation terminal 107 and the current data 112a of the correlation determination period for the first current as current. Obtained from the storage unit 113. Accordingly, the first determination unit 225 acquires the first current and the third current measured by the current measurement unit 111 during the correlation determination period.

  The first determination unit 225 extracts a predetermined time width value from the acquired first current and third current, and calculates a correlation coefficient between the extracted first current and third current as the first correlation coefficient. Calculate as The first determination unit 225 sequentially calculates the first correlation coefficient while shifting the time width in predetermined increments. Accordingly, the first determination unit 225 calculates a first correlation coefficient for the first current and the third current in the entire correlation determination period.

  The first determination unit 225 compares the calculated first correlation coefficient with the fourth threshold value. The 1st determination part 225 determines with a 1st electric current and a 3rd electric current having a correlation, when the calculated 1st correlation coefficient contains what is more than a 4th threshold value. When all of the calculated first correlation coefficients are less than the fourth threshold, the first determination unit 225 determines that there is no correlation between the first current and the third current. The first determination unit 225 outputs data indicating the determination result to the system determination unit 118.

  The second determination unit 226 compares the second current and the third current by comparing the correlation coefficient (second correlation coefficient) of the second current and the third current measured by the current measurement unit 111 with the fifth threshold value. It is determined whether the current has a correlation. Here, the fifth threshold is a value set in advance as appropriate.

  Specifically, the second determination unit 226 uses the current data 112c of the correlation determination period for the third current specified by the instruction from the operation terminal 107 and the current data 112a of the correlation determination period for the second current as current. Obtained from the storage unit 113. Thereby, the second determination unit 226 acquires the second current and the third current measured by the current measurement unit 111 during the correlation determination period.

  The second determination unit 226 extracts a predetermined time width value from the acquired second current and third current, and calculates a correlation coefficient between the extracted second current and third current as the second correlation coefficient. Calculate as The second determination unit 226 sequentially calculates the second correlation coefficient while shifting the time width in predetermined increments. Accordingly, the second determination unit 226 calculates a second correlation coefficient for the entire second current and third current in the correlation determination period.

  The second determination unit 226 compares the calculated second correlation coefficient with the fifth threshold value. The second determination unit 226 determines that there is a correlation between the second current and the third current when the calculated second correlation coefficient includes a value that is greater than or equal to the fifth threshold. When all the calculated second correlation coefficients are less than the fifth threshold, the second determination unit 226 determines that there is no correlation between the second current and the third current. The second determination unit 226 outputs data indicating the determination result to the system determination unit 118.

  So far, the configuration of the power measurement device 200 according to the first modification has been described. From here, operation | movement of the electric power measurement apparatus 200 is demonstrated.

  The power measuring device 200 executes the voltage system discrimination process, similarly to the power measuring device 100 according to the first embodiment. As shown in FIG. 14, the voltage system determination process according to this modification includes a correlation determination process (step S201) instead of the correlation determination process (step S101) according to the first embodiment.

  The correlation determination unit 217 includes a first current and a second current measured during the correlation determination period by the current measurement unit 111, and a third current flowing through the first branch circuit 105a measured during the correlation determination period by the current measurement unit 111. It is determined whether or not there is a correlation with the current (step S201).

  FIG. 15 shows details of the flow of the correlation determination process (step S201) executed by the correlation determination unit 217.

  The first determination unit 225 receives the current data 112c of the correlation determination period for the third current specified by the instruction from the operation terminal 107 and the current data 112a of the correlation determination period for the first current from the current storage unit 113. get. The first determination unit 225 calculates a first correlation coefficient for the entire first current and third current in the acquired correlation determination period (step S211).

  The first determination unit 225 compares the calculated first correlation coefficient with the fourth threshold value, thereby determining whether or not the calculated first correlation coefficient includes a value that is greater than or equal to the fourth threshold value. (Step S212).

  If the first determination unit 225 determines that the calculated first correlation coefficient includes the fourth threshold value or more (step S212; YES), the first determination unit 225 determines that there is a correlation between the first current and the third current. (Step S213), data indicating the result of determination in step S213 is output.

  When it is determined that the calculated first correlation coefficient does not include a value that is equal to or greater than the fourth threshold (step S212; NO), the first determination unit 225 determines that there is no correlation between the first current and the third current. (Step S214), data indicating the result of the determination in step S214 is output.

  The second determination unit 226 receives the current data 112c of the correlation determination period for the third current specified by the instruction from the operation terminal 107 and the current data 112a of the correlation determination period for the second current from the current storage unit 113. get. The second determination unit 226 calculates a second correlation coefficient for the entire second current and third current in the acquired correlation determination period (step S215).

  The second determination unit 226 compares the calculated second correlation coefficient with the fifth threshold value, and thereby determines whether or not the calculated second correlation coefficient includes a value that is greater than or equal to the fifth threshold value. (Step S216).

  If the second determination unit 226 determines that the calculated second correlation coefficient includes the fifth threshold value or more (step S216; YES), the second determination unit 226 determines that there is a correlation between the second current and the third current. (Step S217), data indicating the result of the determination in step S217 is output, and the correlation determination process (step S201) is terminated. The correlation determination unit 217 returns to the voltage system determination process.

  When it is determined that the calculated second correlation coefficient does not include a value that is greater than or equal to the fifth threshold (step S216; NO), the second determination unit 226 determines that there is no correlation between the second current and the third current. (Step S218), data indicating the result of the determination in step S218 is output, and the correlation determination process (step S201) is terminated. The correlation determination unit 217 returns to the voltage system determination process.

  Also according to this modification, the same effects as those of the first embodiment are obtained.

Embodiment 2. FIG.
In the first embodiment and the first modification, the presence / absence of a correlation between each of the first current and the second current and the third current is determined based on the fluctuation of each value of the first current, the second current, and the third current. An example of determination has been described.

  Generally, in a power generation system using natural energy such as a solar power generation system and a wind power generation system, the power generation amount fluctuates due to the influence of the natural environment such as solar radiation and wind power. Therefore, when a power generation system using natural energy is connected to the main circuit 103, each value of the first current and the second current not only fluctuates with the operation of the device A101 or the device B102, but also the power generation May vary with system power generation.

  The power measurement devices 100 and 200 according to the first embodiment or the first modification may be applied to the main circuit 103 to which a power generation system using natural energy is connected. However, in this case, in the power measurement devices 100 and 200, even if the fluctuations in the first current and the second current are actually accompanied by fluctuations in the power generation amount of the power generation system using natural energy, the device A101 or As a result of the operation of the device B102, the presence or absence of a correlation between each of the first current and the second current and the third current is determined.

  In the present embodiment, even when a power generation system using natural energy is connected to the main circuit 103, it is accurately determined whether or not there is a correlation between the first current and the second current and the third current. An example of a power measuring device that can be used will be described.

  As shown in FIG. 16, the power measuring apparatus 300 according to the present embodiment measures the power consumption of the device A101 and the device B102 connected to the main circuit 103 as in the first embodiment. In the present embodiment, the third branch circuit 305 c connected to the solar power generation system 327 that supplies power generated by receiving sunlight is further branched from the main circuit 103. The third branch circuit 305c includes three branch wirings connected to each of the voltage line L1, the voltage line L2, and the neutral line N.

  As shown in FIG. 16, the third branch circuit 305c is provided with a branch breaker 306c and a current sensor CT5. The current sensor CT5 is arranged in association with the branch wiring connected to the voltage line L1 among the three branch wirings constituting the third branch circuit 305c. The current sensor CT5 outputs a current signal corresponding to the magnitude of the current flowing from the solar power generation system 327 to the main circuit 103. The electric power generated by the solar power generation system 327 is not supplied via the wiring connected to the neutral line N, but supplied via the wiring connected to each of the voltage line L1 and the voltage line L2. Is done.

  As shown in FIG. 17, power measurement apparatus 300 according to the present embodiment is roughly the same as that of Embodiment 1 except that correlation determination unit 117 according to Embodiment 1 is provided instead of correlation determination unit 117. It has the same configuration.

  Similar to correlation determination unit 117 according to Embodiment 1, correlation determination unit 317 receives the instruction from operation terminal 107, for example, based on each current measured by current measurement unit 111, the first current and the third It is determined whether there is a correlation between the currents and whether there is a correlation between the second current and the third current.

  The correlation determination unit 317 determines whether there is a correlation between the first current and the third current and whether there is a correlation between the second current and the third current based on the reactive current of each current, not the value of each current itself. This is different from the correlation determination unit 117 according to the first embodiment in this respect.

  Here, the reactive current is a component having a phase difference of 90 degrees from the voltage, and is obtained as Isin θ where θ is the phase of the current and I is the amplitude of the current.

  Specifically, as shown in FIG. 18, the correlation determination unit 317 calculates a reactive current for each current measured by the current measurement unit 111 and calculates each reactive current by the reactive current calculation unit 328. An invalid correlation determination unit 329 that determines whether or not there is a correlation between the first current and the third current and whether or not there is a correlation between the second current and the third current based on the reactive current that has been performed.

  More specifically, the reactive current calculation unit 328 includes the correlation determination period current data 112c for the third current specified by the instruction from the operation terminal 107, and the correlation determination period for each of the first current and the second current. Current data 112a and 112b is acquired from the current storage unit 113. Accordingly, the first determination unit 225 acquires the first current, the second current, and the third current measured by the current measurement unit 111 during the correlation determination period.

  The reactive current calculation unit 328 calculates a reactive current for each of the acquired first current, second current, and third current.

  Here, since the reactive current is a component having a phase difference of 90 degrees from the voltage as described above, a reference voltage is required to calculate the reactive current. As the reference voltage, any voltage of the voltage line L1 and the voltage line L2 may be employed. For example, a method in which the reactive current of the third current is positive may be employed.

  As shown in FIG. 18, the invalid correlation determining unit 329 is replaced with a variation specifying unit 324 and a first determining unit 325 in place of the variation specifying unit 124, the first determining unit 125, and the second determining unit 126 according to the first embodiment. And a second determination unit 326.

  The fluctuation specifying unit 324 specifies the time when the reactive current (third reactive current) calculated for the third current by the reactive current calculating unit 328 fluctuates by a first threshold value or more as the fluctuation time.

  More specifically, the fluctuation specifying unit 324 acquires the third reactive current from the reactive current calculation unit 328. The fluctuation specifying unit 324 calculates a fluctuation amount (for example, a differential value of the current) at each time of the acquired third reactive current. The variation specifying unit 324 compares each variation calculated for the third reactive current with the first threshold value. The fluctuation specifying unit 324 specifies the time when the fluctuation amount calculated for the third reactive current is equal to or greater than the first threshold as the fluctuation time.

  The first determination unit 325 determines whether or not the reactive current (first reactive current) calculated for the first current by the reactive current calculation unit 328 has changed by a second threshold value or more at the fluctuation time specified by the fluctuation specifying unit 324. Based on the above, it is determined whether or not there is a correlation between the first current and the third current.

  More specifically, the first determination unit 325 acquires the first reactive current from the reactive current calculation unit 328. The first determination unit 325 calculates the fluctuation amount at the fluctuation time for the acquired first reactive current. The first determination unit 325 compares the fluctuation amount calculated for the first reactive current with the second threshold value. The first determination unit 325 determines that there is a correlation between the first current and the third current when the fluctuation amount calculated for the reactive current of the first current is greater than or equal to the second threshold. The first determination unit 325 determines that there is no correlation between the first current and the third current when the fluctuation amount calculated for the reactive current of the first current is less than the second threshold. The first determination unit 325 outputs data indicating the determination result to the system determination unit 118.

  The second determination unit 326 determines whether or not the reactive current (second reactive current) calculated for the second current by the reactive current calculation unit 328 has changed by a third threshold value or more at the time of change specified by the change specifying unit 324. Based on the above, it is determined whether or not there is a correlation between the second current and the third current.

  More specifically, the second determination unit 326 acquires the reactive current (second reactive current) calculated for the second current by the reactive current calculation unit 328. The second determination unit 326 calculates a fluctuation amount at the fluctuation time for the acquired second reactive current. The second determination unit 326 compares the fluctuation amount calculated for the second reactive current with the third threshold value. The second determination unit 326 determines that there is a correlation between the second current and the third current when the fluctuation amount calculated for the second reactive current is greater than or equal to the third threshold. The first determination unit 325 determines that there is no correlation between the first current and the third current when the fluctuation amount calculated for the first reactive current is less than the second threshold. The first determination unit 325 outputs data indicating the determination result to the system determination unit 118.

  So far, the configuration of power measuring apparatus 300 according to Embodiment 2 has been described. From here, operation | movement of the electric power measurement apparatus 300 is demonstrated.

  The power measuring device 300 performs the voltage system discrimination process, similarly to the power measuring device 100 according to the first embodiment. As shown in FIG. 19, the voltage system discrimination process according to the present embodiment includes a correlation determination process (step S301) instead of the correlation determination process (step S101) according to the first embodiment.

  The correlation determination unit 317 includes a first current and a second current measured during the correlation determination period by the current measurement unit 111, and a third current flowing through the first branch circuit 105a measured during the correlation determination period by the current measurement unit 111. It is determined whether or not there is a correlation with the current (step S301).

  FIG. 20 shows details of the flow of the correlation determination process (step S301) executed by the correlation determination unit 317.

  The reactive current calculation unit 328 acquires the current data 112a, 112b, and 112c of the correlation determination period for the first current, the second current, and the third current from the current storage unit 113. The fluctuation specifying unit 124 calculates a reactive current at each time for each of the first current, the second current, and the third current indicated by the acquired current data 112a, 112b, and 112c (step S320).

  The fluctuation specifying unit 324 acquires the reactive current (third reactive current) calculated for the third current by the reactive current calculation unit 328. The fluctuation specifying unit 324 calculates a differential value of the acquired third reactive current at each time as a fluctuation amount. Then, the fluctuation specifying unit 324 specifies the time when the calculated fluctuation amount is equal to or greater than the first threshold, and thereby identifies the time (fluctuation time) when the third reactive current has fluctuated more than the first threshold (step S311). ).

  When it is determined that there is a specified time (step S112; YES), the first determination unit 325 acquires the reactive current (first reactive current) calculated for the first current by the reactive current calculation unit 328. The first determination unit 325 calculates the differential value at the fluctuation time specified in step S311 as the fluctuation amount for the acquired first reactive current. Then, the first determination unit 325 determines whether or not the first reactive current has fluctuated more than the second threshold at the fluctuation time by comparing the calculated fluctuation amount with the second threshold (step S314).

  When the calculated fluctuation amount is equal to or greater than the second threshold, the first determination unit 325 determines that the first reactive current has fluctuated more than the second threshold at the fluctuation time (step S314; YES), and the first current and the third It is determined that the current has a correlation (step S115). Further, when the calculated fluctuation amount is less than the second threshold, the first determination unit 325 determines that the first reactive current does not fluctuate more than the second threshold at the fluctuation time (step S314; NO), and the first It is determined that there is no correlation between the current and the third current (step S116).

  The second determination unit 326 acquires the reactive current (second reactive current) of the second current calculated by the reactive current calculation unit 328. The second determination unit 326 calculates the differential value at the fluctuation time specified in step S311 as the fluctuation amount for the acquired second reactive current. Then, the second determination unit 326 determines whether or not the second reactive current has fluctuated more than the third threshold at the fluctuation time by comparing the calculated fluctuation amount with the third threshold (step S317).

  The second determination unit 326 determines that the second reactive current has fluctuated more than the third threshold at the fluctuation time when the calculated fluctuation amount is greater than or equal to the third threshold (step S317; YES), and the second current and third It is determined that there is a correlation between the currents (step S118). Further, when the calculated fluctuation amount is less than the third threshold value, the second determination unit 326 determines that the second reactive current does not fluctuate more than the third threshold value at the fluctuation time (step S317; NO), and the second It is determined that there is no correlation between the current and the third current (step S119).

  According to the present embodiment, the same effects as those of the first embodiment are obtained.

  Further, according to the present embodiment, the power measuring apparatus 300 converts the first reactive current and the second reactive current that flow through the voltage line L1 and the voltage line L2 and the third reactive current that flows through the branch circuits 105a and 105b, respectively. Based on this, the voltage system to which the branch circuits 105a and 105b are connected is determined.

  In many cases, a power generation system using natural energy such as the solar power generation system 327 is operated so that the power factor becomes one. Therefore, the reactive current is not affected by the power generation by the power generation system using natural energy, and fluctuates with the operation of the device A101 and the device B102. Therefore, according to the present embodiment, even if a power generation system using natural energy is connected to the main circuit 103, whether or not there is a correlation between each of the first current and the second current and the third current. Can be accurately determined. As a result, it is possible to accurately determine the voltage system to which the devices A101 and B102 are connected.

  As mentioned above, although Embodiment 2 of this invention was demonstrated, Embodiment 2 may be deform | transformed as follows.

  For example, the power measuring apparatus 300 according to the present embodiment can also be applied when measuring the power consumption of the devices A101 and B102 connected to the main circuit 103 that does not include the solar power generation system 327.

Modification 2
In the second embodiment, the example in which the presence / absence of correlation between each of the first current and the second current and the third current is determined based on the amount of change in the reactive current of each current has been described. However, the method for determining whether or not there is a correlation between each of the first current and the second current and the third current based on the reactive current of each current is not limited thereto.

  In this modified example, as another example of a method for determining the presence / absence of correlation between each of the first current and the second current and the third current based on the reactive current of each current, An example in which the determination is made based on the correlation coefficient of the reactive current between the current and the second current and the third current will be described.

  As shown in FIG. 21, power measurement apparatus 400 according to the present modification is substantially the same as in Embodiment 2 except that it includes a correlation determination unit 417 instead of correlation determination unit 317 according to Embodiment 2. The configuration is provided.

  Correlation determination unit 417 receives the first current and the third current based on each current measured by current measurement unit 111 when receiving an instruction from operation terminal 107, for example, similarly to correlation determination unit 317 according to the second embodiment. It is determined whether there is a correlation between the currents and whether there is a correlation between the second current and the third current.

  As illustrated in FIG. 22, the correlation determination unit 417 includes a reactive current calculation unit 328 similar to that of the second embodiment and an invalid correlation determination unit 429 that replaces the invalid correlation determination unit 329 according to the second embodiment.

  Similarly to the invalid correlation determining unit 329 according to the second embodiment, the invalid correlation determining unit 429 determines whether there is a correlation between the first current and the third current based on the reactive current of each current, the second current, It is determined whether the third current has a correlation.

  The invalid correlation determination unit 429 is different in detailed configuration from the invalid correlation determination unit 329 according to the second embodiment. As illustrated in FIG. 22, the first determination unit 325 and the second determination unit according to the second embodiment. Instead of 326, the first determination unit 425 and the second determination unit 426 are provided. Note that the invalid correlation determination unit 429 does not have to include the fluctuation specifying unit 324.

  Whether the first determination unit 425 has a correlation between the first current and the third current by comparing the correlation coefficient (first correlation coefficient) of the first reactive current and the third reactive current with the fourth threshold value. Determine whether or not.

  Specifically, the first determination unit 425 acquires the first reactive current and the third reactive current from the reactive current calculation unit 328. The first determination unit 425 performs the same processing as the first determination unit 225 according to the first modification for the acquired first reactive current and third reactive current. Accordingly, the first determination unit 425 calculates the first correlation coefficient for the first reactive current and the third reactive current in the entire correlation determination period.

  Similar to the first determination unit 225 according to the first modification, the first determination unit 425 compares the calculated first correlation coefficient with the fourth threshold, and based on the comparison result, the first current and the third It is determined whether the current has a correlation. The first determination unit 425 outputs data indicating the determination result to the system determination unit 118.

  Whether the second determination unit 426 correlates the second current and the third current by comparing the correlation coefficient (second correlation coefficient) of the second reactive current and the third reactive current with the fifth threshold value. Determine whether or not.

  Specifically, the second determination unit 426 acquires the second reactive current and the third reactive current from the reactive current calculation unit 328. The second determination unit 426 performs the same process as the second determination unit 226 according to the first modification for the acquired second reactive current and third reactive current. Accordingly, the second determination unit 426 calculates a second correlation coefficient for the second reactive current and the third reactive current in the entire correlation determination period.

  Similar to the second determination unit 226 according to the second modification, the second determination unit 426 compares the calculated second correlation coefficient with the fifth threshold, and based on the comparison result, the second current and the third It is determined whether the current has a correlation. The second determination unit 426 outputs data indicating the determination result to the system determination unit 118.

  So far, the configuration of the power measurement apparatus 400 according to the modification 2 has been described. From here, operation | movement of the electric power measurement apparatus 400 is demonstrated.

  The power measurement device 400 executes the voltage system determination process, similarly to the power measurement device 300 according to the second embodiment. As shown in FIG. 23, the voltage system determination process according to this modification includes a correlation determination process (step S401) instead of the correlation determination process (step S201) according to the second embodiment.

  The correlation determination unit 417 includes each of the first current and the second current measured during the correlation determination period by the current measurement unit 111 and the third current flowing through the first branch circuit 105a measured during the correlation determination period by the current measurement unit 111. It is determined whether or not there is a correlation with the current (step S401).

  FIG. 23 shows details of the flow of the correlation determination process (step S401) executed by the correlation determination unit 417.

  The first determination unit 425 calculates the correlation coefficient between the first reactive current and the third reactive current calculated in step S320 as the first correlation coefficient (step S411). Based on the first correlation coefficient calculated in step S411, the first determination unit 425 executes processing similar to that in steps S212 to S214 described in the first modification.

  The second determination unit 426 calculates the correlation coefficient between the second reactive current and the third reactive current calculated in step S320 as a second correlation coefficient (step S415). Based on the second correlation coefficient calculated in step S415, the second determination unit 426 performs the same process as in steps S216 to S218 described in the first modification. Thereby, the correlation determination part 417 complete | finishes a correlation determination process (step S401), and returns to a voltage system discrimination | determination process.

  According to this modification, the same effects as those of the second embodiment are obtained.

Embodiment 3 FIG.
In the second embodiment and the second modification, whether or not there is a correlation between each of the first current and the second current and the third current is determined based on fluctuations in the first reactive current, the second reactive current, and the third reactive current. The example to do was explained.

  As described above, a power generation system using natural energy often operates at a power factor of 1. However, in general, a power generation system using natural energy may be operated so that the power factor is other than one. Such operation is called constant power factor operation.

  When a power generation system using natural energy is connected to the main circuit 103 and is operating at a constant power factor, the first reactive current and the second reactive current may vary with the power generation amount of the power generation system. . In this case, in the power measurement devices 300 and 400, even if the fluctuations in the first reactive current and the second reactive current are actually accompanied by fluctuations in the power generation amount of the power generation system using natural energy, As a result of the operation of the device B102, the presence or absence of a correlation between each of the first current and the second current and the third current is determined.

  In the present embodiment, even if the power generation system using natural energy is connected to the main circuit 103 and is operating at a constant power factor, each of the first current and the second current and the third current An example of a power measurement device that can accurately determine the presence or absence of correlation will be described.

  The power measurement apparatus 500 according to the present embodiment measures the power consumption of the device A101 and the device B102 connected to the main circuit 103 as in the first and second embodiments and the first and second modifications.

  As shown in FIG. 25, power measurement apparatus 500 according to the present embodiment is generally the same as that of Embodiment 2 except that correlation determination unit 317 is replaced with correlation determination unit 317. It has the same configuration.

  Correlation determining section 517, like correlation determining section 317 according to Embodiment 2, receives an instruction from operation terminal 107, for example, based on each current measured by current measuring section 111, the first current and the third It is determined whether there is a correlation between the currents and whether there is a correlation between the second current and the third current.

  Correlation determining unit 517 determines whether there is a correlation between the first current and the third current and whether there is a correlation between the second current and the third current based on the orthogonal current of each current, not the reactive current of each current. This is different from the correlation determination unit 317 according to the second embodiment in this respect.

  Here, the orthogonal current is a current component orthogonal to the power generation current of the photovoltaic power generation system as a power generation system using natural energy.

  As shown in FIG. 26, correlation determining section 517 calculates orthogonal current for each current measured by current measuring section 111 instead of reactive current calculating section 328 and reactive correlation determining section 329 according to the second embodiment. Based on the orthogonal current calculation unit 530 and the orthogonal current calculated for each current by the orthogonal current calculation unit 530, whether or not there is a correlation between the first current and the third current, and there is a correlation between the second current and the third current. And an orthogonal correlation determination unit 531 for determining whether or not there is.

  Specifically, the orthogonal current calculation unit 530 uses the first current, the second current, and the third current measured by the current measurement unit 111 during the correlation determination period, similarly to the reactive current calculation unit 328 according to the second embodiment. get. Then, the orthogonal current calculation unit 530 calculates an orthogonal current for each of the acquired first current, second current, and third current.

  As shown in FIG. 26, the orthogonal correlation determination unit 531 is replaced with the variation specifying unit 324, the first determining unit 325, and the second determining unit 326 according to the second embodiment, instead of the variation specifying unit 524 and the first determining unit 525. And a second determination unit 526.

  The fluctuation specifying unit 524 specifies the time when the orthogonal current (third orthogonal current) calculated for the third current by the orthogonal current calculation unit 530 fluctuates more than the first threshold as the fluctuation time.

  The first determination unit 525 determines whether or not the orthogonal current (first orthogonal current) calculated for the first current by the orthogonal current calculation unit 530 has changed by a second threshold value or more at the time of change specified by the change specifying unit 524. Based on the above, it is determined whether or not there is a correlation between the first current and the third current.

  The second determination unit 526 determines whether or not the orthogonal current (second orthogonal current) calculated for the second current by the orthogonal current calculation unit 530 has changed by a third threshold value or more at the time of change specified by the change specifying unit 524. Based on the above, it is determined whether or not there is a correlation between the second current and the third current.

  Details of processing executed by each of the fluctuation specifying unit 524, the first determination unit 525, and the second determination unit 526 are executed by the fluctuation specifying unit 324, the first determination unit 325, and the second determination unit 326 according to the second embodiment. In the processing, the reactive current (first reactive current, second reactive current, and third reactive current) calculated by the reactive current calculation unit 328 is used as the orthogonal current (first orthogonal current, This is almost the same as that replaced with the second orthogonal current and the third orthogonal current.

  The power measuring apparatus 500 according to the present embodiment executes voltage system determination processing that is substantially the same as that of the power measuring apparatus 300 according to the second embodiment. Specifically, the voltage system discrimination process according to the present embodiment is such that the reactive current calculated by the reactive current calculation unit 328 in the second embodiment is replaced with the orthogonal current calculated by the orthogonal current calculation unit 530. Equivalent to.

  According to the present embodiment, the same effects as those of the first embodiment are obtained.

  According to the present embodiment, power measuring apparatus 500 is based on the first orthogonal current and the second orthogonal current that flow in voltage line L1 and voltage line L2, respectively, and the third orthogonal current that flows in branch circuits 105a and 105b. The voltage system to which the branch circuits 105a and 105b are connected is determined.

  Even if a power generation system using natural energy such as the solar power generation system 327 is operating at a constant power factor, the orthogonal current is not affected by the power generation by the power generation system using natural energy, and the devices A101 and B102 are not affected. It fluctuates with the operation. Therefore, according to the present embodiment, when a power generation system using natural energy is connected to the main circuit 103, even if the power generation system using natural energy is not operating at a power factor of 1, Whether or not there is a correlation between each of the first current and the second current and the third current can be accurately determined. As a result, it is possible to accurately determine the voltage system to which the devices A101 and B102 are connected.

  Although the third embodiment of the present invention has been described above, the third embodiment may be modified as follows.

  For example, the power measuring apparatus 500 according to the present embodiment can also be applied when measuring the power consumption of the device A101 and the device B102 connected to the main circuit 103 that does not include the solar power generation system 327.

Modification 3
In the third embodiment, the example in which the presence / absence of the correlation between each of the first current and the second current and the third current is determined based on the variation amount of the orthogonal current of each current has been described. However, the method for determining whether or not there is a correlation between each of the first current and the second current and the third current based on the orthogonal current of each current is not limited thereto.

  In this modification, as another example of a method for determining the presence / absence of correlation between each of the first current and the second current and the third current based on the orthogonal current of each current, An example in which the determination is made based on the correlation coefficient of the orthogonal current between each of the current and the second current and the third current will be described.

  As shown in FIG. 27, power measurement apparatus 600 according to the present modification is substantially the same as in Embodiment 3 except that correlation determination unit 517 is provided instead of correlation determination unit 517 according to Embodiment 3. The configuration is provided.

  Correlation determination unit 617 receives the instruction from operation terminal 107, for example, similarly to correlation determination unit 517 according to the third embodiment, based on each current measured by current measurement unit 111, the first current and the third It is determined whether there is a correlation between the currents and whether there is a correlation between the second current and the third current.

  As shown in FIG. 28, correlation determination section 617 has orthogonal current calculation section 530 similar to that in Embodiment 3, and orthogonal correlation determination section 631 that replaces orthogonal correlation determination section 531 according to Embodiment 3.

  Similarly to the orthogonal correlation determination unit 531 according to Embodiment 3, the orthogonal correlation determination unit 631 determines whether or not there is a correlation between the first current and the third current, based on the orthogonal current of each current, It is determined whether the third current has a correlation.

  The orthogonal correlation determination unit 631 is different in detailed configuration from the orthogonal correlation determination unit 531 according to the third embodiment, and as illustrated in FIG. 28, the first determination unit 525 and the second determination unit according to the third embodiment. A first determination unit 625 and a second determination unit 626 are provided instead of 526. Note that the orthogonal correlation determination unit 631 does not have to include the variation specifying unit 524.

  Whether the first determination unit 625 correlates the first current and the third current by comparing the correlation coefficient (first correlation coefficient) of the first orthogonal current and the third orthogonal current with the fourth threshold value. Determine whether or not.

  Whether the second determination unit 626 correlates the second current and the third current by comparing the correlation coefficient (second correlation coefficient) of the second orthogonal current and the third orthogonal current with the fifth threshold value. Determine whether or not.

  Details of processing executed by each of the first determination unit 625 and the second determination unit 626 are calculated by the reactive current calculation unit 328 in the processing executed by the first determination unit 425 and the second determination unit 426 according to Modification 2. The reactive current is substantially the same as that obtained by replacing the reactive current calculated by the orthogonal current calculation unit 530 with the orthogonal current.

  The power measurement apparatus 600 according to the present modification executes a voltage system determination process that is substantially the same as that of the power measurement apparatus 400 according to the second modification. Specifically, the voltage system determination process according to the present embodiment is performed by orthogonally changing the reactive current (first reactive current, second reactive current, and third reactive current) calculated by the reactive current calculation unit 328 in the second modification. This corresponds to the one replaced with the orthogonal current (first orthogonal current, second orthogonal current, third orthogonal current) calculated by the current calculation unit 530.

  According to the present embodiment, the same effects as those of the third embodiment are obtained.

Embodiment 4 FIG.
In the present embodiment, the presence or absence of correlation between each of the first current and the second current and the third current is determined based on the harmonics of the first current, the second current, and the third current, not the reactive current and the orthogonal current. An example of determination based on component variation will be described.

  The power measurement apparatus 700 according to the present embodiment measures the power consumption of the device A101 and the device B102 connected to the main circuit 103 as in the first and second embodiments and the first and second modifications.

  As shown in FIG. 29, power measurement apparatus 700 according to the present embodiment is generally the same as that of Embodiment 2 except that correlation determination unit 317 according to Embodiment 2 is provided instead of correlation determination unit 317. It has the same configuration.

  Correlation determining section 717 receives the first current and third current based on each current measured by current measuring section 111 when receiving an instruction from operation terminal 107, for example, similarly to correlation determining section 317 according to the second embodiment. It is determined whether there is a correlation between the currents and whether there is a correlation between the second current and the third current.

  The correlation determination unit 717 correlates whether the first current and the third current are correlated with each other based on the harmonic component of each current, not the reactive current of each current, and the second current and the third current. This is different from the correlation determination unit 317 according to the second embodiment in this respect.

  As shown in FIG. 30, correlation determining section 717 calculates harmonic components for each current measured by current measuring section 111 instead of reactive current calculating section 328 and reactive correlation determining section 329 according to the second embodiment. And the second current and the third current based on the harmonic component calculated for each current by the harmonic calculation unit 732 and whether or not there is a correlation between the first current and the third current. A harmonic correlation determining unit 733 that determines whether or not there is a correlation.

  Specifically, the harmonic wave calculation unit 732 calculates the first current, the second current, and the third current measured by the current measurement unit 111 during the correlation determination period, similarly to the reactive current calculation unit 328 according to the second embodiment. get. Then, for each of the acquired first current, second current, and third current, the harmonic calculation unit 732 calculates a harmonic component by, for example, Fourier series expansion of the current waveform.

  As shown in FIG. 30, the harmonic correlation determination unit 733 replaces the variation specifying unit 324, the first determination unit 325, and the second determination unit 326 according to Embodiment 2 with a variation specifying unit 724 and a first determination unit. 725 and a second determination unit 726.

  The fluctuation specifying unit 724 specifies the time when the harmonic component (third harmonic component) calculated for the third current by the harmonic calculating unit 732 fluctuates more than the first threshold as the fluctuation time.

  The first determination unit 725 determines whether the harmonic component (first harmonic component) calculated for the first current by the harmonic calculation unit 732 has changed by a second threshold value or more at the change time specified by the change specifying unit 724. Based on whether or not, it is determined whether or not there is a correlation between the first current and the third current.

  The second determination unit 726 determines whether the harmonic component (second harmonic component) calculated for the second current by the harmonic calculation unit 732 has changed by a third threshold value or more at the change time specified by the change specifying unit 724. Based on whether or not, it is determined whether or not there is a correlation between the second current and the third current.

  The details of the processing executed by each of the fluctuation specifying unit 724, the first determining unit 725, and the second determining unit 726 are executed by the fluctuation specifying unit 324, the first determining unit 325, and the second determining unit 326 according to the second embodiment. In the processing, the reactive current (first reactive current, second reactive current, and third reactive current) calculated by the reactive current calculation unit 328 is converted into a harmonic component (first harmonic) calculated by the harmonic calculation unit 732. Component, second harmonic component, and third harmonic component).

  The power measurement apparatus 700 according to the present embodiment executes voltage system determination processing that is substantially the same as that of the power measurement apparatus 300 according to the second embodiment. Specifically, in the voltage system discrimination process according to the present embodiment, the reactive current calculated by the reactive current calculation unit 328 in the second embodiment is replaced with a harmonic component calculated by the harmonic calculation unit 732. It corresponds to.

  According to the present embodiment, the same effects as those of the first embodiment are obtained.

  Further, according to the present embodiment, the power measuring apparatus 700 includes the first harmonic component and the second harmonic component that flow through the voltage line L1 and the voltage line L2, respectively, and the third harmonic that flows through the branch circuits 105a and 105b. Based on the wave component, the voltage system to which the branch circuits 105a and 105b are connected is determined.

  In general, an electric device generates a specific harmonic in the main circuit 103. Therefore, by determining the voltage system to which the branch circuits 105a and 105b are connected based on the harmonic component corresponding to the device A101 (device B102) that is the target for determining the connected voltage system, the device A101 and the device It becomes possible to accurately determine the voltage system to which B102 is connected.

  Note that the harmonic component corresponding to the device A101 (device B102) may be manually instructed, for example, when determining the voltage system, and data indicating the harmonics generated by the electric device is stored in the power measurement device 700 in advance. It may be set and selected from them. The power measuring device 700 can select the harmonic component corresponding to the device A101 (device B102) from preset data, thereby saving the user from setting.

Modification 4
In the fourth embodiment, the example in which the presence / absence of the correlation between each of the first current and the second current and the third current is determined based on the fluctuation amount of the harmonic component of each current has been described. However, the method of determining the presence or absence of the correlation between each of the first current and the second current and the third current based on the harmonic component of each current is not limited to this.

  In this modified example, as another example of a method for determining the presence / absence of correlation between each of the first current and the second current and the third current based on the harmonic component of each current, An example will be described in which determination is made based on the correlation coefficient of the harmonic components of each of the first current and the second current and the third current.

  As shown in FIG. 31, power measurement apparatus 800 according to the present modification is substantially the same as that of Embodiment 4 except that correlation determination section 817 is provided instead of correlation determination section 717 according to Embodiment 4. The configuration is provided.

  Correlation determining section 817 receives the first current and third current based on each current measured by current measuring section 111 when receiving an instruction from operation terminal 107, for example, similarly to correlation determining section 717 according to the fourth embodiment. It is determined whether there is a correlation between the currents and whether there is a correlation between the second current and the third current.

  As shown in FIG. 32, correlation determination unit 817 includes harmonic calculation unit 732 similar to that in Embodiment 4, and harmonic correlation determination unit 833 that replaces harmonic correlation determination unit 733 according to Embodiment 4. .

  Similarly to the harmonic correlation determination unit 733 according to the fourth embodiment, the harmonic correlation determination unit 833 determines whether or not there is a correlation between the first current and the third current based on the harmonic component of each current. It is determined whether or not there is a correlation between the second current and the third current.

  The harmonic correlation determination unit 833 differs from the harmonic correlation determination unit 517 according to the fourth embodiment in detailed configuration, and as shown in FIG. 28, the first determination unit 725 and the second determination unit 725 according to the fourth embodiment. Instead of each of the determination units 726, a first determination unit 825 and a second determination unit 826 are provided. Note that the harmonic correlation determination unit 833 does not have to include the fluctuation specifying unit 724.

  Whether the first determination unit 825 has a correlation between the first current and the third current by comparing the correlation coefficient (first correlation coefficient) of the first orthogonal current and the third orthogonal current with the fourth threshold value. Determine whether or not.

  Whether the second determination unit 826 has a correlation between the second current and the third current by comparing the correlation coefficient (second correlation coefficient) of the second orthogonal current and the third orthogonal current with the fifth threshold value. Determine whether or not.

  Details of processing executed by each of the first determination unit 825 and the second determination unit 826 are calculated by the reactive current calculation unit 328 in the processing executed by the first determination unit 425 and the second determination unit 426 according to Modification 2. The generated reactive currents (first reactive current, second reactive current, third reactive current) and the harmonic components calculated by the harmonic calculation unit 732 (first orthogonal current, second orthogonal current, third orthogonal current) It is almost the same as the one replaced with.

  The power measuring apparatus 800 according to the present modification executes a voltage system determination process that is substantially the same as that of the power measuring apparatus 400 according to the second modification. Specifically, in the voltage system determination process according to the present embodiment, in the second modification, the reactive current calculated by the reactive current calculation unit 328 is replaced with a harmonic component calculated by the harmonic calculation unit 732. Equivalent to.

  According to the present embodiment, the same effect as in the fourth embodiment is obtained.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to each embodiment, The form which combined each embodiment and the modification suitably, and the form which added the various change to it including.

  100, 200, 300, 400, 500, 600, 700, 800 Power measurement device, 101 Device A, 102 Device B, 103 Main circuit, 105a First branch circuit, 105b Second branch circuit, 111 Current measurement unit, 114 Voltage Measurement unit, 117, 217, 317, 417, 517, 617, 717, 817 Correlation determination unit, 118 System determination unit, 121 Power consumption measurement unit, 124, 324, 524, 724 Fluctuation specifying unit, 125, 225, 325 425, 525, 625, 725, 825 First determination unit, 126, 226, 326, 426, 526, 626, 726, 826 Second determination unit, 305c Third branch circuit, 327 Solar power generation system, 328 Reactive current calculation , 329, 429 Invalid correlation determination unit, 531, 631 Orthogonal correlation determination unit, 530 Orthogonal current calculation unit, 531 and 631 Orthogonal correlation determination unit, 732 harmonic calculation unit, 733 and 833 harmonic correlation determination unit.

Claims (18)

A first current and a second current flowing in each of the first voltage line and the second voltage line constituting a plurality of voltage systems, and a wiring to which an electric device is connected, and a branch connected to one of the voltage systems A current measuring unit for measuring a third current flowing through the circuit;
Based on each current measured by the current measuring unit, it is determined whether or not there is a correlation between the first current and the third current and whether there is a correlation between the second current and the third current. A correlation determination unit;
A system discriminating unit for discriminating a voltage system to which the branch circuit is connected based on a result determined by the correlation determining unit ;
The correlation determination unit
A fluctuation identifying unit that identifies a time when the third current measured by the current measuring unit fluctuates more than a first threshold;
Whether there is a correlation between the first current and the third current based on whether the first current measured by the current measuring unit has fluctuated more than a second threshold at the time specified by the fluctuation specifying unit A first determination unit for determining whether or not;
Whether there is a correlation between the second current and the third current based on whether the second current measured by the current measuring unit has fluctuated more than a third threshold at the time specified by the fluctuation specifying unit A power measurement device having a second determination unit for determining whether or not . A first current and a second current flowing in each of the first voltage line and the second voltage line constituting a plurality of voltage systems, and a wiring to which an electric device is connected, and a branch connected to one of the voltage systems A current measuring unit for measuring a third current flowing through the circuit;
Based on each current measured by the current measuring unit, it is determined whether or not there is a correlation between the first current and the third current and whether there is a correlation between the second current and the third current. A correlation determination unit;
A system discriminating unit for discriminating a voltage system to which the branch circuit is connected based on a result determined by the correlation determining unit ;
The correlation determination unit
By comparing the correlation coefficient between the first current and the third current measured by the current measuring unit and the fourth threshold value, it is determined whether there is a correlation between the first current and the third current. 1 determination unit;
It is determined whether or not there is a correlation between the second current and the third current by comparing a correlation coefficient between the second current and the third current measured by the current measuring unit and a fifth threshold value. A power measuring device having a second determination unit . A first current and a second current flowing in each of the first voltage line and the second voltage line constituting a plurality of voltage systems, and a wiring to which an electric device is connected, and a branch connected to one of the voltage systems A current measuring unit for measuring a third current flowing through the circuit;
Based on each current measured by the current measuring unit, it is determined whether or not there is a correlation between the first current and the third current and whether there is a correlation between the second current and the third current. A correlation determination unit;
A system discriminating unit for discriminating a voltage system to which the branch circuit is connected based on a result determined by the correlation determining unit ;
The correlation determination unit
Reactive current calculator for calculating reactive current for each current measured by the current measuring unit
When,
Based on the reactive current calculated for each current by the reactive current calculation unit, the first current
Whether there is a correlation between the current and the third current, and there is a correlation between the second current and the third current.
The power measuring device which has an invalid correlation determination part which determines whether it is . The invalid correlation determination unit
A fluctuation specifying unit for specifying a time when the reactive current calculated for the third current by the reactive current calculation unit fluctuates more than a first threshold;
Based on whether or not the reactive current calculated for the first current by the reactive current calculation unit fluctuates more than a second threshold at the time specified by the fluctuation specifying unit, the first current and the third current are A first determination unit for determining whether there is a correlation;
Based on whether or not the reactive current calculated for the second current by the reactive current calculating unit has changed by a third threshold or more at the time specified by the fluctuation specifying unit, the reactive current calculating unit calculates the second current and the third current. The power measurement device according to claim 3 , further comprising: a second determination unit that determines whether there is a correlation. The invalid correlation determination unit
Whether or not there is a correlation between the first current and the third current by comparing the correlation coefficient of the reactive current calculated for the first current and the third current with the fourth threshold by the reactive current calculation unit A first determination unit for determining
Whether or not there is a correlation between the second current and the third current by comparing the correlation coefficient of the reactive current calculated for the second current and the third current with the fifth threshold by the reactive current calculation unit The power measurement device according to claim 3 , further comprising: a second determination unit that determines whether or not. A first current and a second current flowing in each of the first voltage line and the second voltage line constituting a plurality of voltage systems, and a wiring to which an electric device is connected, and a branch connected to one of the voltage systems A current measuring unit for measuring a third current flowing through the circuit;
Based on each current measured by the current measuring unit, it is determined whether or not there is a correlation between the first current and the third current and whether there is a correlation between the second current and the third current. A correlation determination unit;
A system discriminating unit for discriminating a voltage system to which the branch circuit is connected based on a result determined by the correlation determining unit ;
The correlation determination unit
Supply power to the multiple voltage systems for each current measured by the current measurement unit
Quadrature current calculation that calculates the quadrature current that is the current component that is orthogonal to the generated current of the power generation system
And
Based on the orthogonal current calculated for each current by the orthogonal current calculation unit, the first current
Whether there is a correlation between the current and the third current, and there is a correlation between the second current and the third current.
An electric power measurement device having an orthogonal correlation determination unit that determines whether or not . The orthogonal correlation determination unit
A variation identifying unit that identifies a time when the orthogonal current calculated for the third current by the orthogonal current calculating unit has fluctuated more than a first threshold;
Based on whether or not the quadrature current calculated for the first current by the quadrature current calculation unit fluctuates more than a second threshold at the time specified by the fluctuation specifying unit, the first current and the third current are A first determination unit for determining whether there is a correlation;
Based on whether or not the quadrature current calculated for the second current by the quadrature current calculation unit fluctuates more than a third threshold at the time specified by the fluctuation specifying unit, the second current and the third current are The power measurement device according to claim 6 , further comprising: a second determination unit that determines whether there is a correlation. The orthogonal correlation determination unit
Whether or not there is a correlation between the first current and the third current by comparing the correlation coefficient of the orthogonal current calculated for the first current and the third current with the fourth threshold by the orthogonal current calculation unit A first determination unit for determining
Whether the second current and the third current are correlated by comparing the correlation coefficient of the orthogonal current calculated for the second current and the third current with the fifth threshold by the orthogonal current calculation unit The power measurement device according to claim 6 , further comprising: a second determination unit that determines whether or not. A first current and a second current flowing in each of the first voltage line and the second voltage line constituting a plurality of voltage systems, and a wiring to which an electric device is connected, and a branch connected to one of the voltage systems A current measuring unit for measuring a third current flowing through the circuit;
Based on each current measured by the current measuring unit, it is determined whether or not there is a correlation between the first current and the third current and whether there is a correlation between the second current and the third current. A correlation determination unit;
A system discriminating unit for discriminating a voltage system to which the branch circuit is connected based on a result determined by the correlation determining unit ;
The correlation determination unit
A harmonic calculation unit for calculating a harmonic component for each current measured by the current measurement unit;
Based on the harmonic component calculated for each current by the harmonic calculation unit, whether the first current and the third current are correlated, and whether the second current and the third current are correlated A power measurement device having a harmonic correlation determination unit that determines whether or not . The harmonic correlation determination unit
A fluctuation identifying unit that identifies a time when the harmonic component calculated for the third current by the harmonic calculating unit fluctuates more than a first threshold;
Based on whether or not the harmonic component calculated for the first current by the harmonic calculation unit fluctuates more than a second threshold at the time specified by the fluctuation specifying unit, the first current and the third current A first determination unit that determines whether or not there is a correlation;
Based on whether or not the harmonic component calculated for the second current by the harmonic calculation unit fluctuates more than a third threshold at the time specified by the fluctuation specifying unit, the second current and the third current The power measurement device according to claim 9 , further comprising: a second determination unit that determines whether or not there is a correlation. The harmonic correlation determination unit
Whether or not there is a correlation between the first current and the third current by comparing the correlation coefficient of the harmonic component calculated for the first current and the third current with the fourth threshold by the harmonic calculation unit. A first determination unit for determining whether or not
Whether or not there is a correlation between the second current and the third current by comparing the correlation coefficient of the harmonic component calculated for the second current and the third current with the fifth threshold by the harmonic calculation unit. The power measurement device according to claim 9 , further comprising: a second determination unit that determines whether or not. The plurality of voltage systems include a first voltage system including a first voltage line and a third voltage line which is a neutral line, a second voltage line and a third voltage line. A second voltage system, and a third voltage system composed of the first voltage line and the second voltage line,
When it is determined that only the first current and the third current are correlated, the system determination unit is a voltage system to which the branch circuit is connected is the first voltage system, and the second current and the If it is determined that only the third current has a correlation, the voltage system to which the branch circuit is connected is the second voltage system, and both the first current and the second current and the third current are The power measuring device according to any one of claims 1 to 11 , wherein when it is determined that there is a correlation, the voltage system to which the branch circuit is connected is determined to be the third voltage system. A voltage measuring unit for measuring the voltage of each of the first voltage line and the second voltage line;
Based on the voltage measured by the voltage measuring unit and the third current measured by the current measuring unit for the voltage system determined by the system determining unit, the power consumption of the electrical device is calculated, and the calculation was when power is negative, any of claim 1, further comprising a power measuring unit for determining the power consumption of the electrical device by reversing the sign of the power consumption and the calculated 1 2 1 The power measuring device according to item. The current measuring unit is a wiring to which the first and second currents flowing in each of the first voltage line and the second voltage line constituting the plurality of voltage systems and the electric device are connected, and any one of the voltage systems Measuring a third current flowing through a branch circuit connected to
A fluctuation identifying unit identifying a time when the third current measured by the current measuring unit has fluctuated more than a first threshold;
The first determination unit determines whether the first current measured by the current measurement unit has fluctuated by a second threshold value or more at the time specified by the variation specifying unit . Determining whether the current is correlated ;
The second determination unit determines whether the second current measured by the current measurement unit has fluctuated by a third threshold or more at the time specified by the variation specifying unit, and the third current and the third current. and determining whether there is a correlation to a current,
A voltage system determination method, comprising: a system determination unit determining a voltage system to which the branch circuit is connected based on the determined result. The current measuring unit is a wiring to which the first and second currents flowing in each of the first voltage line and the second voltage line constituting the plurality of voltage systems and the electric device are connected, and any one of the voltage systems Measuring a third current flowing through a branch circuit connected to
Does the first determination unit have a correlation between the first current and the third current by comparing the correlation coefficient between the first current and the third current measured by the current measurement unit and the fourth threshold value ? Determining whether or not
The second determination unit has a correlation between the second current and the third current by comparing the correlation coefficient between the second current and the third current measured by the current measurement unit and the fifth threshold value. and determining whether,
A voltage system determination method, comprising: a system determination unit determining a voltage system to which the branch circuit is connected based on the determined result. The current measuring unit is a wiring to which the first and second currents flowing in each of the first voltage line and the second voltage line constituting the plurality of voltage systems and the electric device are connected, and any one of the voltage systems Measuring a third current flowing through a branch circuit connected to
A reactive current calculation unit calculates a reactive current for each current measured by the current measurement unit;
The invalid correlation determination unit determines whether the first current and the third current are correlated based on the reactive current calculated for each current by the reactive current calculation unit, and the second current and the third current. Determining whether or not there is a correlation,
A voltage system determination method, comprising: a system determination unit determining a voltage system to which the branch circuit is connected based on the determined result. The current measuring unit is a wiring to which the first and second currents flowing in each of the first voltage line and the second voltage line constituting the plurality of voltage systems and the electric device are connected, and any one of the voltage systems Measuring a third current flowing through a branch circuit connected to
An orthogonal current calculation unit, for each current measured by the current measurement unit, to calculate an orthogonal current that is a current component orthogonal to a generated current of a power generation system that supplies power to the plurality of voltage systems;
The orthogonal correlation determination unit determines whether the first current and the third current have a correlation based on the orthogonal current calculated for each current by the orthogonal current calculation unit, and the second current and the third current. Determining whether or not there is a correlation,
A voltage system determination method, comprising: a system determination unit determining a voltage system to which the branch circuit is connected based on the determined result. The current measuring unit is a wiring to which the first and second currents flowing in each of the first voltage line and the second voltage line constituting the plurality of voltage systems and the electric device are connected, and any one of the voltage systems Measuring a third current flowing through a branch circuit connected to
A harmonic calculation unit calculates a harmonic component for each current measured by the current measurement unit;
The harmonic correlation determination unit determines whether the first current and the third current have a correlation based on the harmonic component calculated for each current by the harmonic calculation unit , the second current, and the second current Determining whether the three currents are correlated;
A voltage system determination method, comprising: a system determination unit determining a voltage system to which the branch circuit is connected based on the determined result.

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