JP2016102653A - Electric power measuring apparatus and method for measuring electric power - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power measuring apparatus or the like, which can improve reliability of electric power measurement by avoiding occurrence of false measurement of an electric power value due to false sensor installation and correcting previous electric power value with sign errors.SOLUTION: An electric power measuring apparatus 1 includes: a main-side current sensor 13 and a sub-side current sensor 14 each for detecting a current in a route portion; an electric power supply calculating unit 3 and an electric power generation calculating unit 4 each for calculating an electric power value based on the currents and a detection result obtained by a voltage sensor 15; a writing unit 6 for writing the calculated electric power value, the detection result obtained by the voltage sensor 15 and used for the calculation, and the currents into a storage unit 8; a sign controlling unit 5 for controlling the electric power supply calculating unit 3 to reverse the sign of the electric power value if the sign of the calculated electric power value is determined to be wrong; and a correcting unit 7 for reversing the sign in the previous data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technical field of measuring electric power in a connection path for supplying electric power from a power generator to a load.

  FIG. 8 schematically shows a configuration example of the power generation system (see, for example, Patent Document 1). The power generation system 100 includes a power generation device 101 and a power measurement device 102. The power generation device 101 is, for example, a fuel cell (a device that generates power by converting chemical energy into electrical energy) and has a configuration for generating power. This power generator 101 is a single-phase three-wire system and is electrically connected to a commercial power source 103 via a load 105. In other words, the power generation apparatus 101 is electrically connected to the commercial power supply 103 by three conductive wires of two voltage lines 106 and 107 and a neutral wire (a wire grounded to the ground) 108.

  The power measuring device 102 includes current sensors 111 and 112, a voltage sensor 113, a heater 114, and a control device 115. The current sensor 111 is interposed in the voltage line 106 at a portion closer to the commercial power supply 103 than the load 105, and has a configuration for detecting a current value of a current flowing through the interposed portion in the voltage line 106. The current sensor 112 is interposed in the voltage line 107 at a portion closer to the commercial power supply 103 than the load 105, and has a configuration for detecting a current value of a current flowing through the interposed portion in the voltage line 107. The voltage sensor 113 is connected to the voltage lines 106 and 107 and the neutral line 108 closer to the commercial power supply 103 than the load 105. The voltage sensor 113 has a configuration for detecting a potential difference (voltage value) between the voltage line 106 and the neutral line 108 and a potential difference (voltage value) between the voltage line 107 and the neutral line 108. Yes.

  The control device 115 includes, for example, a CPU (Central Processing Unit) (not shown), and has a function of controlling the overall operation of the power measurement device 102 by the CPU. For example, the control device 115 has a function of calculating a purchased power value and a sold power value using current values and voltage values detected by the current sensors 111 and 112 and the voltage sensor 113. The purchased power value is a value of power supplied from the commercial power supply 103 to the load 105. The sold power value is a value of power flowing from the power generation apparatus 101 to the commercial power supply 103 side.

  Here, it is assumed that the attachment (connection) state of the current sensors 111 and 112 and the voltage sensor 113 is determined as follows. That is, when power is supplied from the commercial power supply 103 toward the load 105, the sign of the power value obtained by multiplying each current value by the current sensors 111 and 112 by the voltage value by the voltage sensor 113 becomes positive. As such, the sensors 111, 112, 113 are attached. In other words, when a current is flowing from the power generation apparatus 101 toward the commercial power supply 103, the sign of the power value obtained by multiplying the current value by the voltage value is negative. Sensors 111, 112, and 113 are attached.

  In such a case, when the sign of the calculated power value is positive, the control device 115 is in a state in which power is being supplied from the commercial power supply 103 toward the load 105. Is calculated as the amount of electric power purchased. In addition, when the sign of the calculated power value is negative, the control device 115 is in a state in which power is flowing from the power generation device 101 toward the commercial power supply 103. Calculate as

  By the way, in the electric power measurement apparatus 102, the current sensors 111 and 112 and the voltage sensor 113 may be attached in an incorrect state. Due to an error in the operation of attaching the sensor (connection operation), the sign of the power value calculated by the control device 115 may be inappropriate. In other words, when power is flowing from the power generation device 101 toward the commercial power supply 103, the sign of the power value calculated by the control device 115 is negative, but it becomes positive due to incorrect installation. This happens. In other words, due to an error in how to attach the sensor, there arises a problem that the control device 115 calculates the purchased power value and the sold power value in reverse.

  In order to prevent such a problem from occurring, the power measuring apparatus 102 has the following functions. That is, the control device 115 drives the heater 114 in a state where the power generation device 101 is not generating power. The control device 115 calculates the power value based on the current values from the current sensors 111 and 112 and the voltage value from the voltage sensor 113 while the heater 114 is being driven. And the control apparatus 115 judges that the current sensors 111 and 112 are attached in the incorrect state, when the calculated electric power value is below a threshold value. The control device 115 changes (corrects) the sign of the power value calculated thereafter to the opposite sign. With such a function, the control device 115 tries to prevent an erroneous measurement problem caused by an attachment error of the current sensors 111 and 112.

  Further, as other related technologies, for example, Patent Documents 2 and 3 exist. Patent document 2 discloses the technique regarding an electric power indicator. The power indicator measures a current value by a current sensor for each of the plurality of power generation devices. In addition, the power indicator displays the value of the generated power obtained by the calculation of the measured current value and the voltage value in the distribution board for each power generator. Thereby, patent document 2 can present the difference in the electric power generation amount and electric power generation condition by an electric power generating apparatus.

  Patent document 3 discloses the technique regarding a private power generation system. This private power generation system calculates power selling and power purchase based on the current value detected by the current sensor and the voltage value detected by the voltage detecting means. Further, the private power generation system inverts the sign of the calculation result when the amount of power generated by the private power generation means is equal to or less than a predetermined amount and the calculation result is a power sale exceeding the predetermined amount. Thereby, patent document 3 can implement | achieve the installation construction which does not receive the influence resulting from the difference in the attachment direction of a current sensor.

JP 2009-118673 A JP 2014-059244 A JP 2006-042514 A

  By the way, the power measuring device 102 (control device 115) calculates (measures) the power value every moment, and stores the calculated power value in a storage unit (not shown). It is assumed that the power measurement device 102 detects an attachment error of the current sensors 111 and 112 in such a state that the power value is stored in the storage unit every moment. In this case, as described above, the power measuring apparatus 102 corrects the sign of the power value calculated after detecting the attachment error to the opposite sign. Then, the power measuring apparatus 102 stores the corrected power value in the storage unit. Thereby, the power measurement apparatus 102 can avoid the problem that an incorrect power value is continuously stored in the storage unit.

  However, the power value having an error in the code stored in the storage unit until the power measuring device 102 detects the mounting error of the current sensors 111 and 112 remains unchanged without correcting the code. For this reason, for example, when calculating the total value of the purchased power value and the sold power value during the set period, the plurality of power values used for the calculation include a power value having an error in the code. It is. As a result, the power measuring apparatus 102 cannot calculate the total sum of the purchased power value and the sold power value.

  In other words, Patent Documents 1 to 3 do not take into account any correction of the power value having a code error stored in the storage unit.

  In addition, for example, when the power measurement device 102 is installed, when the current sensors 111 and 112 and the voltage sensor 113 are replaced, or when the current sensors 111 and 112 and the voltage sensor 113 are reattached, It is necessary to manage information indicating the start date and time of measurement. That is, the construction company needs to set information indicating the measurement start date and time in the power measuring apparatus 102. However, when the construction company forgets to set the measurement start date and time, or when there is a setting error, the date and time when the measurement was started is unknown. Thereby, even if it is a case where the power measuring apparatus 102 detects that the sign of the supplied power value is not appropriate, it cannot determine when the past data written in the storage unit should be corrected. As a result, the power measurement apparatus 102 may not be able to correct past data correctly.

  The present invention has been devised to solve the above problems. That is, the main object of the present invention is to avoid the problem of erroneous measurement of the power value caused by the sensor mounting error, and also to correct the past power value having the error of the sign, thereby improving the reliability of the power measurement. An object of the present invention is to provide a power measuring device and the like that can improve the performance.

  In order to achieve the above object, a power measurement apparatus according to one embodiment of the present invention includes the following configuration.

That is, the power measuring device according to one aspect of the present invention is
Whether the main power generation device and the sub power generation device are provided in a path portion on the main power generation device side with respect to the load in the connection path for electrically connecting the main power generation device and the sub power generation device, and whether current can be measured in the provided mode. Main-side current sensor that outputs first control information representing the operation status of the current and detects a current flowing through the path portion;
Provided in the path portion closer to the sub power generation device than the load in the connection path, and outputs second control information indicating the operation status of whether or not current can be measured in the provided mode, and outputs to the path portion A sub-side current sensor for detecting a flowing current;
Based on a current detected by the main-side current sensor and a detection result by a voltage sensor provided in the connection path, a supply power value representing a magnitude of power supplied from the main power generation device to the load is calculated. A supply power calculation unit to calculate,
Based on the current detected by the sub-side current sensor and the detection result by the voltage sensor, a generated power calculation unit that calculates a generated power value representing the magnitude of the power output from the sub power generator,
The supply power value and the generated power value are stored in an internal or external memory in a manner associated with time information representing the time when the detection result of the voltage sensor used for calculation and the current are detected, respectively. Writing part to write to the part,
When it is detected that the sign of the power supply value calculated by the power supply calculation unit is not appropriate using the power supply value and the generated power value, the sign of the power supply value is reversed. A code control unit for controlling the supply power calculation unit to be a code;
When it is detected that the sign of the supplied power value is not appropriate, the first control information output from the main-side current sensor and the second control information output from the sub-side current sensor are obtained. A correction unit that changes the sign of the supplied power value written in the storage unit over the period from the measurement start date and time representing the date and time until it is detected that the sign is not appropriate. Prepare.

  In order to achieve the object, a power measurement method according to an aspect of the present invention includes the following configuration.

That is, the power measurement method according to one aspect of the present invention includes:
In the aspect provided by the main-side current sensor provided in the path portion on the main power generation device side of the load in the connection path for electrically connecting the main power generation device and the sub power generation device via the load. Outputting first control information indicating an operational status of whether or not measurement is possible, and detecting a current flowing through the path portion;
Second control information representing an operation state indicating whether or not current can be measured in the provided mode is provided by a sub-side current sensor provided in a path portion closer to the sub power generation device than the load in the connection path. , Detecting the current flowing in the path part,
Based on a current detected by the main-side current sensor and a detection result by a voltage sensor provided in the connection path, a supply power value representing a magnitude of power supplied from the main power generation device to the load is calculated. Calculate
Based on the current detected by the sub-side current sensor and the detection result by the voltage sensor, a generated power value representing the magnitude of the power output from the sub power generator is calculated,
The supply power value and the generated power value are stored in an internal or external memory in a manner associated with time information representing the time when the detection result of the voltage sensor used for calculation and the current are detected, respectively. Write to the department,
When it is detected that the sign of the power supply value calculated by the power supply calculation unit is not appropriate using the power supply value and the generated power value, the sign of the power supply value is reversed. Controlling the supply power calculation unit to be a sign,
When it is detected that the sign of the supplied power value is not appropriate, the first control information output from the main-side current sensor and the second control information output from the sub-side current sensor are obtained. The sign of the supplied power value written in the storage unit is changed to the opposite sign over the period from the measurement start date and time indicating the date and time until it is detected that the sign is not appropriate.

  According to the present invention, it is possible to improve the reliability of power measurement by avoiding the problem of erroneous measurement of the power value caused by the sensor mounting error and also correcting the past power value having a code error. It is possible to provide a power measuring device that can be used.

It is a block diagram which simplifies and represents the structure of the power measuring device of 1st Embodiment which concerns on this invention. It is a block diagram which simplifies and represents the structure of the electric power measurement apparatus of 2nd Embodiment which concerns on this invention. It is a model figure which represents typically the energization state of the electric current which flows into the connection path | route in the 2nd Embodiment of this invention. It is a block diagram which simplifies and represents the structure of the code | symbol control part in the 2nd Embodiment of this invention. It is a flowchart which shows the operation | movement which the control apparatus which comprises the electric power measurement apparatus in the 2nd Embodiment of this invention performs. It is a time chart explaining operation | movement of the electric power measurement apparatus in the 2nd Embodiment of this invention. It is a block diagram which simplifies and represents the structure of the electric power measurement apparatus of other embodiment which concerns on this invention. 1 is a block diagram schematically illustrating a configuration example of a power generation system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is a block diagram showing a simplified configuration of the power measuring apparatus 1 according to the first embodiment of the present invention.

  In FIG. 1, the power measuring device 1 includes a supply power calculation unit 3, a generated power calculation unit 4, a sign control unit 5, a writing unit 6, a correction unit 7, a storage unit 8, a main side current sensor 13, and a sub side current sensor 14. Is provided. The power measuring device 1 may use an external storage unit 8 instead of the built-in storage unit 8.

  In the case where the sub power generation device 11 is electrically connected to the main power generation device 10 via the load 12, the power measuring device 1 includes the power value of the power supplied from the main power generation device 10 to the load 12, and the sub power generation This is a device that can measure the power value of the power generated by the device 11. That is, the power measuring device 1 is supplied from the main power generator 10 to the load 12 when the load 12 is connected to a connection path in which the main power generator 10 and the sub power generator 11 are electrically connected. The power value of the power and the power value of the power generated by the sub power generator 11 can be measured. The power measuring apparatus 1 uses detection values output from the main-side current sensor 13, the sub-side current sensor 14, and the voltage sensor 15, respectively. The main-side current sensor 13, the sub-side current sensor 14, and the voltage sensor 15 are provided in the connection path described above.

  In the following description, for convenience of explanation, the main-side current sensor 13 and the sub-side current sensor 14 are collectively referred to simply as “current sensor”. In the following description, the first control information and the second control information are collectively referred to simply as “control information” (the same applies to the following embodiments).

  The main-side current sensor 13 is provided in a path portion closer to the main power generator 10 than the load 12 in the connection path 16 that electrically connects the main power generator 10 and the sub power generator 11. That is, the main-side current sensor 13 is disposed in the path portion on the main power generation device 10 side with respect to the load 12. Moreover, the main side current sensor 13 outputs the 1st control information showing the operation condition of whether an electric current can be measured in the aspect arrange | positioned at the said path | route part. The main-side current sensor 13 has a configuration for detecting a current flowing through the path portion.

  The sub-side current sensor 14 is provided in a path portion closer to the sub power generator 11 than the load 12 in the connection path 16. That is, the sub-side current sensor 14 is disposed in the path portion on the sub power generation device 11 side with respect to the load 12. In addition, the sub-side current sensor 14 outputs second control information indicating an operation state as to whether or not current can be measured in the aspect arranged in the path portion. The sub-side current sensor 14 has a configuration for detecting a current flowing through the path portion.

  Here, the control information (first and second control information) is information indicating an operation status indicating whether or not the current flowing through the path portion where the own current sensor (13, 14) is arranged can be detected (measured). Including. For example, the current sensor may be configured to output control information including information representing the operation status in response to the operation status changing by being arranged in the path portion.

  In addition, as an example, the two current sensors (13, 14) sandwich the connection path 16 to be measured by a clamp portion (not shown), and the strength of the magnetic field generated by the current flowing in the sandwiched connection path 16 Based on the above, the principle of detecting the magnitude of the current can be adopted. It should be noted that a general technique can be employed for the principle of detecting the magnitude of current. Therefore, detailed description in this embodiment is omitted (hereinafter, the same applies to each embodiment).

  The voltage sensor 15 is connected (provided) to the connection path 16, and here has a configuration for detecting a potential difference (voltage) between the ground as the reference potential and the connection path 16.

  Based on the detection result of the current output from the main-side current sensor 13 and the detection result of the voltage output from the voltage sensor 15, the supply power calculation unit 3 is the amount of power supplied from the main power generator 10 to the load 12. It has a function of calculating a supply power value representing power (power value, power amount). That is, the supplied power calculation unit 3 has a function of calculating a power value (power amount) supplied from the main power generation apparatus 10 to the load 12 based on the detection result of the current and the detection result of the voltage. .

  The generated power calculation unit 4 generates power representing the magnitude of power generated by the sub power generation device 11 based on the detection result of the current output from the sub-side current sensor 14 and the detection result of the voltage output from the voltage sensor 15. It has a function to calculate the power value.

  The writing unit 6 uses the supply power value calculated by the supply power calculation unit 3 and the generated power value calculated by the generated power calculation unit 4 as the voltage detection result and the current by the voltage sensor 15 used for the calculation. A function of writing in the storage unit 8 is provided in a manner associated with time information representing the detected time. The time information may be time information, or time information and date information. Or time information is not restricted to time information, For example, the information of the elapsed time from the measurement start time etc. may be sufficient.

  The code control unit 5 uses the supply power value calculated by the supply power calculation unit 3 and the generated power value calculated by the generated power calculation unit 4 to supply power value calculated by the supply power calculation unit 3 Has a function of detecting that the sign of is not appropriate. Further, the sign control unit 5 determines that the sign of the supplied power value is not appropriate when the sign of the supplied power value is negative and the absolute value of the supplied power value is larger than the absolute value of the generated power value. Is detected. When the sign control unit 5 detects that the sign of the supply power value by the supply power calculation unit 3 is not appropriate, the sign control unit 5 outputs the sign of the supply power value output from the supply power calculation unit 3 to the opposite sign. A function for controlling the supplied power calculation unit 3 is provided.

  The correction unit 7 has a function of operating as follows when it is detected that the sign of the supply power value by the supply power calculation unit 3 is not appropriate. The correction unit 7 detects the sign of the supplied power value written in the storage unit 8 from the date and time when measurement is started (measurement start date and time) until it is detected that the sign of the supplied power value is not appropriate. Is changed (corrected) to the opposite sign.

  Here, the measurement start date and time is information representing the date and time when the first control information output from the main-side current sensor 13 and the second control information output from the sub-side current sensor 14 are obtained. That is, the measurement start date and time is information indicating the date and time when the correction unit 7 obtains (receives) the control information output from all the current sensors constituting the power measuring device 1.

  As described above, according to the power measurement device 1 according to the present embodiment, it is possible to avoid the problem of erroneous measurement of the power value due to the sensor mounting error, and also to correct the past power value having a code error. Thus, the reliability for power measurement can be improved. The reason is as described below.

  That is, the power measuring apparatus 1 detects the sign of the supply power value output from the supply power calculation unit 3 after the detection when the sign of the supply power value by the supply power calculation unit 3 is detected to be inappropriate. It has a control function to change the sign to the opposite sign. For this reason, the power measuring apparatus 1 can output a supplied power value with a correct sign, even if the main-side current sensor 13 and the voltage sensor 15 are not attached as originally specified. In addition, the power measuring apparatus 1 changes the sign of the power supply value having a sign error written in the storage unit 8 before it is detected that the calculated power supply value is not appropriate to the opposite sign ( Function to correct). Thereby, the power measuring device 1 can improve the accuracy of the calculation result (for example, the total value of the supplied power values in the set period) using the past data written in the storage unit 8. Thereby, the power measuring apparatus 1 can improve the reliability with respect to the power measurement.

  In particular, the current sensor has a function of outputting control information (first and second control information) to the correction unit 7. Moreover, the correction | amendment part 7 is the supply power value written in the memory | storage part 8 over the period until it is detected from the measurement start date and time showing the date which acquired control information that the positive / negative sign of a supply power value is not appropriate. It has a function of correcting the positive / negative sign of. Thereby, for example, the manager who manages the power measuring apparatus 1 does not need to be aware of when the sign of the supplied power value is not appropriate. The power measuring device 1 executes the following processing even when the power measuring device 1 is installed, the current sensor or the voltage sensor is replaced, or the current sensor or the voltage sensor is reattached. Because it can be done. That is, the power measuring apparatus 1 can correct the positive / negative sign of the past data to the opposite sign over a period from the measurement start date and time until the positive / negative sign is detected as inappropriate.

<Second Embodiment>
Next, a second embodiment based on the power measuring apparatus 1 according to the first embodiment of the present invention described above will be described. In the following description, the characteristic part according to the present embodiment will be mainly described. At this time, the same reference numerals are assigned to the same configurations as those in the above-described embodiments, and duplicate descriptions are omitted.

  A power measurement device 20 according to a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 2 is a block diagram showing a simplified configuration of the power measurement apparatus 20 according to the second embodiment of the present invention.

  The power measurement device 20 of the second embodiment measures the following power value when the power generation device 22 that is a sub power generation device is electrically connected to the commercial power source 24 that is the main power generation device via a load 23. It is a device that can. That is, the power value measured by the power measuring device 20 includes the value of power supplied from the commercial power supply 24 to the load 23 (hereinafter sometimes referred to as “supply power value”), and power generation by the power generation device 22. It is a value of electric power (hereinafter sometimes referred to as “generated electric power value”).

  In the second embodiment, the power generation device 22 is, for example, a solar power generation device. In this 2nd Embodiment, the electric power generating apparatus 22 outputs alternating current power. The power generation device 22 is electrically connected to a commercial power supply 24 with a single-phase three-wire system. That is, the power generation device 22 is electrically connected to the commercial power supply 24 through a connection path 25 formed by the first voltage line 26, the second voltage line 27, and the neutral line 28 connected to the ground. Yes. The commercial power source 24 is a main power source that supplies AC power to the load 23.

  The load 23 is connected to two conductors selected from the voltage lines 26 and 27 and the neutral line 28 based on the rated voltage determined by the specifications. The load 23 is supplied with electric power from the commercial power supply 24 and the power generation device 22. Here, when the amount of power generated by the power generation device 22 is larger than the amount of power consumed by the load 23, a state called reverse power flow in which current (electric power) flows from the power generation device 22 to the commercial power supply 24 is brought about. . Note that the load 23 is not limited to one and may be a plurality.

  The power measuring device 20 of the second embodiment includes a first main-side current sensor 30 and a second main-side current sensor 31 that are main-side current sensors, a power-generation-side current sensor 32 that is a sub-side current sensor, and a first voltage sensor. 34 and a second voltage sensor 35 are provided. Furthermore, the power measurement device 20 includes a supply power calculation unit 37, a generated power calculation unit 38, a code control unit 39, a control device 40, and a storage unit 41. Note that the power measurement device 20 may use an external storage unit as the storage unit 41 instead of the built-in storage unit 41.

  The first main-side current sensor 30 (hereinafter sometimes referred to as “current sensor 30” for short) is interposed in the path portion on the commercial power supply 24 side of the load 23 in the first voltage line 26. . The current sensor 30 has a configuration for outputting a current value of a current flowing through the interposed portion.

  The second main-side current sensor 31 (hereinafter sometimes referred to as “current sensor 31” for short) is provided in the second voltage line 27 in the path portion closer to the commercial power supply 24 than the load 23. . The current sensor 31 has a configuration for outputting a current value of a current flowing through the interposed portion.

  The power generation side current sensor 32 (hereinafter sometimes referred to as “current sensor 32” for short) is interposed in the first voltage line 26 at a portion closer to the power generation device 22 than the load 23. The current sensor 32 is configured to output a current value of a current flowing through the interposed portion.

  These current sensors (current sensors 30, 31, and 32) output a control signal as control information indicating an operation state of whether or not current can be measured on at least a voltage line provided with a detection end of the sensor.

  More specifically, the current sensor 30 transmits a control signal indicating an operation status as to whether or not the current can be measured at least on the first voltage line 26 provided with the detection end of the sensor. Output to the device 40. The current sensor 31 sends, to the code control unit 39 and the control device 40, a control signal indicating an operation status indicating whether or not the current can be measured at least on the second voltage line 27 provided with the detection end of the sensor. Output. Then, the current sensor 32 sends a control signal indicating an operation status indicating whether or not the current can be measured at least in the first voltage line 26 provided with the detection end of the sensor to the code control unit 39 and the control device 40. Output.

  More specifically, for example, the current sensor according to the second embodiment includes a clamp unit (not shown) in which at least a detection end of the sensor sandwiches a voltage line so that a current can be detected, and a signal generation unit that generates a control signal. (Not shown). In this case, the control signal is information indicating the open / close state of the clamp unit. That is, when the clamp portion is in the closed state, the control signal includes information indicating that the current can be electrically measured. On the other hand, when the clamp portion is in the open state, the control signal includes information indicating that the current cannot be measured. Thus, the current sensor may adopt a configuration that outputs a control signal according to the open / close state of the clamp unit. However, in the present embodiment, the clamp unit described above does not have to be physically openable and closable, and the connection state with the voltage line is switched by the current sensor or the clamp unit, so that the open / close state of the clamp unit is substantially changed. It is only necessary to have a function to be realized. In the following description, for convenience of description, it is expressed as “the clamp portion is open or closed”.

  The first voltage sensor 34 (hereinafter sometimes referred to as “voltage sensor 34” for short) is connected to the first voltage line 26 and the neutral line 28. The voltage sensor 34 has a configuration for detecting a potential difference (voltage) of the first voltage line 26 with respect to the neutral line 28. The second voltage sensor 35 (hereinafter sometimes referred to as “voltage sensor 35” for short) is connected to the second voltage line 27 and the neutral line 28. The voltage sensor 35 is configured to detect a potential difference (voltage) of the second voltage line 27 with respect to the neutral line 28.

  In the second embodiment, in the state where the current sensor 30 and the voltage sensor 34 are attached to the connection path 25 according to the original specifications, the current value by the current sensor 30 and the voltage sensor 34 are assumed as the premise of the description to be described later. The sign of the power value (first supply power value) by multiplication with the voltage value is as follows. That is, when power is supplied from the commercial power supply 24 to the load 23, the sign of the first supply power value is positive. In addition, when power is flowing from the power generation device 22 toward the commercial power supply 24, the sign of the first supply power value is negative. Furthermore, in a state where the current sensor 31 and the voltage sensor 35 are attached to the connection path 25 as originally specified, a power value (a value obtained by multiplying the current value by the current sensor 31 and the voltage value by the voltage sensor 35) is assumed. The sign of (second supply power value) is as follows. That is, when power is supplied from the commercial power supply 24 to the load 23, the sign of the second supply power value is positive. In addition, when power flows from the power generation device 22 toward the commercial power supply 24, the sign of the second supply power value is negative. Based on this assumption, the details of the specific operation will be described below.

  The supply power calculation unit 37 includes a first supply power calculator 44 and a second supply power calculator 45.

  The first supply power calculator 44 energizes the portion of the first voltage line 26 closer to the commercial power supply 24 than the load 23 by multiplying the current value by the current sensor 30 and the voltage value by the voltage sensor 34. A function of calculating the power value of the power being used as the first supply power value is provided. In the second embodiment, since the power flowing through the first voltage line 26 is alternating current, the first supply power calculator 44 calculates an average power value for a predetermined period of the alternating current for each period. The first supply power value is calculated every moment. To give a specific example, when the frequency of the alternating current flowing through the first voltage line 26 is 50 hertz, the first supply power calculator is set to output an average power value for one cycle of the alternating current. 44 calculates an average power value for 20 milliseconds as a supplied power value about every 20 milliseconds.

  In the second embodiment, the first supply power calculator 44 receives a sign inversion signal (third control information) representing a command to change the sign of the calculated value from the sign control unit 39 to the opposite sign. There is. In this case, the first supply power calculator 44 outputs a value obtained by changing the sign of the calculated value to the opposite sign as the first supply power value.

  The second supply power calculator 45 energizes a portion of the second voltage line 27 closer to the commercial power supply 24 than the load 23 by multiplying the current value by the current sensor 31 and the voltage value by the voltage sensor 35. A function of calculating the power value of the power being stored as the second supply power value. Similarly to the first supply power calculator 44, the second supply power calculator 45 calculates an average power value for a predetermined period of alternating current as a second supply power value for each period. In addition, when receiving the sign inversion signal from the sign control unit 39, the second supply power calculator 45 outputs a value obtained by changing the sign of the calculated value to the opposite sign as the second supply power value.

  The generated power calculation unit 38 includes a first generated power calculator 46 and a second generated power calculator 47.

  The first generated power calculator 46 energizes a portion of the first voltage line 26 that is closer to the power generation device 22 than the load 23 by multiplying the current value by the current sensor 32 and the voltage value by the voltage sensor 34. It has a function of calculating the power value of the current power as the first generated power value.

  The second generated power calculator 47 energizes a portion of the second voltage line 27 closer to the power generator 22 than the load 23 by multiplying the current value by the current sensor 32 and the voltage value by the voltage sensor 35. It has a function of calculating the power value of the current power as the second generated power value. Similarly to the first supply power calculator 44, the first generated power calculator 46 and the second generated power calculator 47 also calculate the average power value for a predetermined period of alternating current for each period. Calculate as In the second embodiment, the first generated power calculator 46 and the second generated power calculator 47 are configured such that the calculated first generated power value or the sign of the second generated power value is always positive. Has been.

  The sign control unit 39 uses the calculated values calculated by the supply power calculation unit 37 and the generated power calculation unit 38, respectively, and outputs the first supply power value and the second supply power value output from the supply power calculation unit 37. The function of detecting that the sign of each is not appropriate is provided.

  Here, by using the calculated values respectively calculated by the supply power calculation unit 37 and the generated power calculation unit 38, the first supply power value and the second supply for the positive / negative sign (positive / negative direction) as described above. The reason why it can be detected that the respective positive and negative signs of the power value are not appropriate will be described with reference to FIG.

  FIG. 3 is a model diagram schematically showing an energization state of a current flowing through the connection path 25 in the second embodiment of the present invention.

  In the following description, the current value of the current supplied from the commercial power supply 24 to the load 23a is assumed to be Iza. Let Izb be the current value of the current flowing from the commercial power supply 24 to the load 23b. Let Izc be the current value of the current flowing from the commercial power supply 24 to the load 23c. In the portion of the first voltage line 26 closer to the commercial power supply 24 than the load 23, the current value of the current passed from the commercial power supply 24 side to the loads 23a and 23c is Iz1 (Iz1 = Iza + Izc). In the portion of the second voltage line 27 closer to the commercial power supply 24 than the load 23, the current value of the current flowing from the commercial power supply 24 to the loads 23b and 23c is Iz2 (Iz2 = Izb + Izc). Furthermore, the current value of the current that flows through the connection path 25 when the power generation device 22 generates power is defined as Ipv. The current value detected by the current sensor 30 is I30. The current value detected by the current sensor 31 is I31. The voltage value detected by the voltage sensor 34 is assumed to be V34. The voltage value detected by the voltage sensor 35 is assumed to be V35.

  First, in the following description, the first supply power value Wz1 will be described.

  The first supply power value Wz1 is a value obtained by multiplying the current value I30 detected by the current sensor 30 and the voltage value V34 detected by the voltage sensor 34. Further, the current I30 detected by the current sensor 30 can be expressed by Expression (1). As a result, the first supply power value Wz1 is expressed as in Expression (2).

I30 = Iz1-Ipv (1)
Wz1 = I30 * V34 = (Iz1-Ipv) * V34 (2)
Here,-represents subtraction. Further, x represents multiplication (hereinafter, the same applies to each embodiment).

  A reverse power flow (that is, a phenomenon in which the power generated by the power generation device 22 flows to the commercial power supply 24 side) occurs when the amount of power generated by the power generation device 22 is greater than the amount of power consumed by the load 23 (23a, 23b, 23c). This is a phenomenon in which the surplus power flows to the commercial power supply 24 side. In the state where the reverse power flow is generated, the current value Ipv of the current generated by the power generation device 22 is larger than the current value Iz1 of the current flowing from the commercial power supply 24 side to the load 23 side (Iz1 <Ipv). From this, in the state where the reverse power flow is occurring, the first supply power value Wz1 represented by the equation (2) is negative. Moreover, the 1st supply electric power value Wz1 represented by Formula (2) can be represented like Formula (3). From this, in the state where the reverse power flow is generated, the equation (4) is established.

Wz1 = (Iz1-Ipv) * V34 = Iz1 * V34-Ipv * V34 (3)
Iz1 × V34−Ipv × V34 <0 (4)
Moreover, in the state where the reverse power flow is generated, surplus power that has not been consumed by the load 23 among the power generated by the power generation device 22 flows to the commercial power supply 24 side. Therefore, the absolute value of the first supply power value Wz1 does not exceed the absolute value of the first generated power value Wp1 (Wp1 = Ipv × V34). Thus, when the sign of the first supply power value Wz1 is negative, the equation (5) is established. Expression (6) is an expression obtained by rewriting Expression (5) using Expression (3) or the like.

| Wz1 | <| Wp1 | (5)
| Iz1 × V34−Ipv × V34 | <| Ipv × V34 | (6)
However, due to the fact that the current sensor 30 and the voltage sensor 34 are in the wrong mounting state, there are cases where the expression (5) does not hold even if the sign of the first supply power value Wz1 is negative. That is, when no reverse power flow occurs, the maximum absolute value of the first supply power value Wz1 is not restricted by the amount of power generated by the power generation device 22. Therefore, the absolute value of the first supply power value Wz1 may be larger than the absolute value of the first generated power value Wp1. In this case, due to an attachment error of the current sensor 30 or the voltage sensor 34, if the reverse flow does not occur but the sign of the first generated power value Wp1 becomes negative, the first Even if the sign of the supplied power value Wz1 is negative, Expressions (5) and (6) do not hold.

  For this reason, when the first supply power value Wz1 is negative and the equation (7) holds, it can be determined that the sign of the first supply power value Wz1 is not appropriate.

| Iz1 × V34−Ipv × V34 |> | Ipv × V34 | (7)
Since it can be expressed as Iz1 = I30 + Ipv based on Expression (1), Expression (7) can be rewritten as Expression (8) by using this.

| (I30 + Ipv) × V34−Ipv × V34 |> | Ipv × V34 | (8)
That is, Expression (8) is | I30 × V34 |> | Ipv × V34 |, and further rewritten to be | Wz1 |> | Wp1 |. That is, when the first supply power value Wz1 is negative and the absolute value of the first supply power value Wz1 is larger than the absolute value of the first generated power value Wp1, the positive / negative of the first supply power value Wz1. It can be determined that the code is not appropriate.

  For the same reason regarding the second supply power value Wz2, the second supply power value Wz2 is negative and the absolute value of the second supply power value Wz2 is larger than the absolute value of the second generation power value Wp2. Therefore, it can be determined that the sign of the second supply power value Wz2 is not appropriate.

  The sign control unit 39 includes a circuit that detects that the sign of the first supply power value Wz1 and the second supply power value Wz2 is not appropriate by comparing the supply power value and the generated power value as described above. ing.

  More specifically, in the second embodiment, the code control unit 39 includes a first code control circuit 50 and a second code control circuit 51. The first code control circuit 50 and the second code control circuit 51 have the same circuit configuration. FIG. 4 is a block diagram showing a simplified circuit configuration example of the first code control circuit 50 (second code control circuit 51). The circuit 50 (51) shown in FIG. 4 includes a flip-flop circuit 53 and a comparator 54.

  The comparator 54 compares the supplied power value Wz1 (Wz2) calculated by the supplied power calculator 44 (45) with the generated power value Wp1 (Wp2) calculated by the generated power calculator 46 (47), A circuit configuration for outputting an excess signal is provided in the following cases. When the comparator 54 outputs an excess signal, the supplied power value Wz1 (Wz2) is negative, and the absolute value of the supplied power value Wz1 (Wz2) is greater than the absolute value of the generated power value Wp1 (Wp2). This is also the case.

  The flip-flop circuit 53 includes a set unit S and a reset unit R that are signal input units, and an output unit Q. In the example of FIG. 4, the set unit S is electrically connected to the output unit of the comparator 54. The reset unit R is connected to current sensors (current sensors 30, 31, and 32). After the excess signal is input from the comparator 54 to the set unit S, the flip-flop circuit 53 continuously outputs the sign inversion signal (third control information) from the output unit Q, and the reset unit R receives the control signal. When added, it has a circuit configuration for stopping the output of the sign inversion signal. The sign inversion signal output from the flip-flop circuit 53 is applied to the first supply power calculator 44, the second supply power calculator 45, and the control device 40. As described above, the first power supply calculator 44 and the second power supply calculator 45 supply a value obtained by changing the sign of the calculated power value to the opposite sign when the sign inversion signal is applied. Output as a value.

  The control device 40 includes, for example, a CPU (Central Processing Unit). The control device 40 is configured to control the overall operation of the power measurement device 20 by executing, for example, a computer program (program) read from the storage unit 41 by the CPU. In the second embodiment, the control device 40 includes a correction unit 56 and a writing unit 57 as functional units.

  The writing unit 57 represents the time when the power values output from the first supply power calculator 44, the second supply power calculator 45, the first generated power calculator 46, and the second generated power calculator 47 are calculated. A function of writing in the storage unit 41 is provided in a manner associated with the time information. The time information associated with the power value may be time information by a clock mechanism built in the control device 40, or may be other information representing time other than the time information.

  Further, when receiving the control signals output from the current sensors (current sensors 30, 31, and 32), the writing unit 57 stores information indicating the date and time when all the control signals are received as the measurement start date and time information. The function of storing in the unit 41 is provided. In other words, when the writing unit 57 receives a control signal indicating that each current sensor is connected so that a current value can be measured, the writing unit 57 stores information indicating the received date and time as information on the measurement start date and time. Stored in the unit 41.

  When the correction unit 56 detects that the sign inversion signal is output from the first code control circuit 50 of the code control unit 39, the correction unit 56 sets the first supply power value Wz1 written in the storage unit 41 as follows. It has a function to correct. That is, the correction unit 56 calculates the sign of the first supply power value Wz1 calculated and written in the storage unit 41 during the period from the measurement start date and time stored in the storage unit 41 until the sign inversion signal is output. A function of changing to the opposite sign and updating the first supply power value Wz1 is provided.

  Similarly, when the correction unit 56 detects that a sign inversion signal is output from the second code control circuit 51 of the code control unit 39, the correction unit 56 outputs the second supply power value Wz2 written in the storage unit 41. Has the function to correct as follows. That is, the correction unit 56 calculates the sign of the second supply power value Wz2 calculated and written in the storage unit 41 during the period from the measurement start date and time stored in the storage unit 41 until the sign inversion signal is output. It has a function of changing to the opposite sign and updating the second supply power value Wz2.

  In the following description, the operation of the power measurement device 20 in the present embodiment will be described more specifically with reference to FIGS. 5 and 6.

  FIG. 5 is a flowchart showing an operation performed by the control device 40 constituting the power measuring device 20 according to the second embodiment of the present invention. FIG. 6 is a time chart for explaining the operation of the power measuring apparatus 20 according to the second embodiment of the present invention. In FIG. 6, the first supply power value Wz1 and the first generated power value WP1 written in the storage unit 41 are represented by bar graphs. FIG. 6 shows time in the horizontal axis direction.

  In the following description, for convenience of explanation, an operation in which the control device 40 corrects the sign of the supplied power values Wz1 and Wz2 stored in the storage unit 41 will be described as an example.

  In the following description, for example, it is assumed that the current sensors 30 and 31 are replaced. Thereby, for example, when the clamp unit outputs a control signal indicating an open state, the current sensors 30 and 31 stop outputting the control signal in response to the clamp unit being closed (FIG. 6). Time T1 → T2). When the flip-flop circuit 53 of the sign control unit 39 receives the control signal, for example, when the sign inversion signal is output from the output unit Q, the output of the sign inversion signal is stopped (time in FIG. 6). (See T1-> T2).

  Based on the received control signal, the control device 40 determines the open / closed state of the clamp portion included in each current sensor. As a result of determining the open / close state, the control device 40 proceeds to step S102 when determining that the clamp portion is in the closed state. On the other hand, when it is determined that the clamp portion is in the open state, the control device 40 repeats the process shown in step S101 (step S101). That is, the control device 40 detects that any one of the clamp portions of the current sensors 30, 31, and 32 is in an open state, and does not perform calculation processing by the power calculators 44, 45, 46, and 47, and proceeds to step S101. The processing shown is repeated (time T1 shown in FIG. 6). The control device 40 takes in information of measurement start date and time (for example, time T2) from a built-in clock mechanism or the like, and writes the measurement start time in the storage unit 41 (step S102).

  Thereafter, when the control device 40 receives the first supply power value Wz1, the second supply power value Wz2, the first generated power value Wp1, and the second generated power value Wp2 (step S103), these power values are respectively converted into time information. The data is written in the storage unit 41 in the associated manner (step S104).

  And the control apparatus 40 judges whether the output of the sign inversion signal was started (step S105). That is, when the supply power calculation unit 37 and the generated power calculation unit 38 calculate the power values Wz1, Wz2, Wp1, and Wp2, the sign control unit 39 reverses the sign as described above based on the calculated power values. It is determined whether or not to start signal output. If the output of the sign inversion signal has not been started by the determination of the code control unit 39, the control device 40 repeats the operations after step S103 after the determination operation of step S104. That is, the control device 40 writes the power value calculated every moment in the storage unit 41.

  Thereafter, for example, when the sign of the first supply power value Wz1 is negative, the sign control unit 39 executes the following process. That is, when the absolute value of the first supply power value Wz1 is larger than the absolute value of the first generated power value Wp1 (see time T6 in FIG. 6), an excess signal is output from the comparator 54 of the sign control unit 39. Is output. Thereby, the output of the sign inversion signal is started from the flip-flop circuit 53 of the sign control unit 39 (time T7 in FIG. 6).

  When detecting that the output of the sign inversion signal has been started (step S105 in FIG. 5), the correction unit 56 of the control device 40 reads information on the measurement start date and time (time T2 in FIG. 6) from the storage unit 41. Then, the correction unit 56 reverses the sign of the first supply power value Wz1 written in the storage unit 41 from the measurement start date and time T2 until the sign inversion signal is output (from time T2 to time T6). Change to sign. That is, the correction unit 56 corrects past data (step S106). When the output of the sign inversion signal is started, the sign of the calculated value output from the first supply power calculator 44 of the supply power calculation unit 37 is output in a state where the sign is changed to the opposite sign. Therefore, the data correction of the storage unit 41 does not have to be performed.

  In the above example, the correction unit 56 corrects the first supply power value Wz1 written in the storage unit 41. Similarly, the correction unit 56 changes the second supply power value Wz2 in the storage unit 41. In some cases.

  Since the power measurement device 20 of the second embodiment has the above-described configuration, it can improve the reliability of power measurement as in the first embodiment.

(Other embodiments)
In addition, this invention is not limited to 1st and 2nd embodiment, Various embodiment can be taken. For example, in addition to the configuration of the second embodiment, the power measurement device 20 may further employ a configuration including the display unit 61.

  FIG. 7 is a block diagram showing a simplified configuration of a power measurement device 60 according to another embodiment of the present invention. The power measuring device 60 further includes a display unit 61 in addition to the configuration of the power measuring device 20 described in the second embodiment.

  The display unit 61 is a liquid crystal screen, for example, and has a function of displaying the calculated power value and the like. The display content of the display unit 61 is controlled by the control device 40.

  For example, if it is determined in step S101 shown in FIG. 5 that the clamp unit is in the open state, the control device 40 informs (presents) a warning indicating that at least power measurement preparation is not complete. ) Possible functions may be provided. That is, the control device 40 may present the display unit 61 as described above when at least one of the first and second control information indicates that the current value cannot be detected.

  Or the display part 61 is an indicator etc. which utilized LED (Light Emitting Diode), for example, and may be provided with the function which can show that the measurement preparation of electric power is not ready by the aspect of lighting. Or the display part 61 may be provided with the function which presents the result of the positive / negative determination of a positive / negative sign by the aspect of lighting, for example.

  Thereby, the electric power measurement apparatus 60 can notify an electric power consumer or a construction company that the clamp part of an electric current sensor is an open state, for example.

  Alternatively, for example, when the correction unit 56 corrects past data, the display unit 61 may notify that the data correction has been performed.

  Further, in the second embodiment, the supply power calculation unit 37 and the generated power calculation unit 38 are configured using a calculator that is separate from the control device 40. On the other hand, the control device 40 may function as the supply power calculation unit 37 and the generated power calculation unit 38. In this case, the power measurement device 20 includes power values Wz1, Wz2, Wp1 based on the current values output from the current sensors 30, 31, 32 and the voltage values output from the voltage sensors 34, 35. , A computer program for calculating Wp2 is provided. Then, the control device 40 executes the computer program to calculate power values Wz1, Wz2, Wp1, and Wp2. In this case, since the calculator can be omitted, the power measuring device 20 can be downsized.

  Furthermore, in the second embodiment, the sign control unit 39 is configured by hardware such as a comparator 54 and a flip-flop circuit 53. On the other hand, the control device 40 may be configured to function also as the code control unit 39. In this case, when it is determined that the power measuring device 20 needs to change the sign of the supplied power value to the opposite sign based on the comparison result between the supplied power value and the generated power value, the supplied power A computer program for controlling the calculation unit 37 is given. The control device 40 also functions as the code control unit 39 by executing the computer program. In this case, since the comparator 54 and the flip-flop circuit 53 can be omitted, the power measuring device 20 can be downsized.

  Furthermore, in 2nd Embodiment, the power generator 22 which is a sub power generator is connected to the commercial power source 24 as a main power generator. Instead of this, for example, the power generation device 22 may be configured to be connected to another power generation device (main power generation device) other than the commercial power source 24.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1, 20, 60 Power measuring device 3 Supply power calculation part 4 Generated power calculation part 5 Code | symbol control part 6 Writing part 7 Correction | amendment part 8 Memory | storage part 10 Main power generation apparatus 11 Sub power generation apparatus 12, 23 Load 13 Main side current sensor 14 Sub Side current sensor 15 voltage sensor 16 connection path 22 power generation device 24 commercial power supply 25 connection path 26 first voltage line 27 second voltage line 28 neutral line 30 first main side current sensor 31 second main side current sensor 32 power generation Side current sensor 34 First voltage sensor 35 Second voltage sensor 37 Supply power calculation unit 38 Generated power calculation unit 39 Sign control unit 40 Control device 41 Storage unit 44 First supply power calculator 45 Second supply power calculator 46 First Generated power calculator 47 Second generated power calculator 50 First code control circuit 51 Second code control circuit 53 Flip Circuit 54 comparator 56 correction unit 57 writing unit 61 display unit 100 power generation system 101 power generation device 102 power measurement device 103 commercial power supply 105 load 106, 107 voltage line 108 neutral line 111, 112 current sensor 113 voltage sensor 114 heater 115 control apparatus

Claims (9)

Whether the main power generation device and the sub power generation device are provided in a path portion on the main power generation device side with respect to the load in the connection path for electrically connecting the main power generation device and the sub power generation device, and whether current can be measured in the provided mode. Main-side current sensor that outputs first control information representing the operation status of the current and detects a current flowing through the path portion;
Provided in the path portion closer to the sub power generation device than the load in the connection path, and outputs second control information indicating the operation status of whether or not current can be measured in the provided mode, and outputs to the path portion A sub-side current sensor for detecting a flowing current;
Based on a current detected by the main-side current sensor and a detection result by a voltage sensor provided in the connection path, a supply power value representing a magnitude of power supplied from the main power generation device to the load is calculated. A supply power calculation unit to calculate,
Based on the current detected by the sub-side current sensor and the detection result by the voltage sensor, a generated power calculation unit that calculates a generated power value representing the magnitude of the power output from the sub power generator,
The supply power value and the generated power value are stored in an internal or external memory in a manner associated with time information representing the time when the detection result of the voltage sensor used for calculation and the current are detected, respectively. Writing part to write to the part,
When it is detected that the sign of the power supply value calculated by the power supply calculation unit is not appropriate using the power supply value and the generated power value, the sign of the power supply value is reversed. A code control unit for controlling the supply power calculation unit to be a code;
When it is detected that the sign of the supplied power value is not appropriate, the first control information output from the main-side current sensor and the second control information output from the sub-side current sensor are obtained. A correction unit that changes the sign of the supplied power value written in the storage unit over the period from the measurement start date and time representing the date and time until it is detected that the sign is not appropriate;
A power measuring device. The code control unit
When the sign of the supplied power value is negative and the absolute value of the supplied power value is larger than the absolute value of the generated power value, it is detected that the sign of the supplied power value is not appropriate. Item 2. The power measuring device according to Item 1. The first control information is
As the operating status, including information indicating whether or not the main-side current sensor can detect the current flowing through the path portion on the main power generation device side,
The second control information is
As the operating status, including information indicating whether or not the sub-side current sensor can detect the current flowing in the path portion on the sub power generator side,
The writing unit
The date and time when the first and second control information are obtained are stored in the storage unit as the measurement start date and time when the first and second control information indicates that a current can be detected. Power measuring device. The main power generation device and the sub power generation device are connected by a single-phase three-wire system composed of three wires of a first voltage line, a second voltage line, and a neutral wire that is grounded,
As the main-side current sensor, a first main-side current sensor that detects a current of the first voltage line and a second main-side current sensor that detects a current of the second voltage line are provided,
As the voltage sensor, a first voltage sensor that detects a voltage between the neutral line and the first voltage line, and a second voltage that detects a voltage between the neutral line and the second voltage line. A sensor,
The supply power calculation unit calculates a first supply power value based on a current value by a first main-side current sensor and a voltage value by a first voltage sensor as the supply power value, and a second main-side current sensor A second supply power value is calculated based on the current value by the voltage value by the second voltage sensor,
The generated power calculation unit calculates a first generated power value based on a current value by the sub-side current sensor and a voltage value by the first voltage sensor as the generated power value, and a current value by the sub-side current sensor , Calculating the second generated power value based on the voltage value by the second voltage sensor,
When the sign control unit detects that the sign of the first supply power value is not appropriate using the first supply power value and the first generated power value, the sign control unit determines the first supply power value. The supply power calculation unit is controlled so that the positive / negative sign is reversed, and the positive / negative sign of the second supply power value is not appropriate using the second supply power value and the second generated power value. The second power supply value is controlled so that the sign of the second power supply value is reversed,
When it is detected that the sign of the first supply power value is not appropriate, the correction unit stores the data for a period from the measurement start date and time until it is detected that the sign is not appropriate. When the sign of the first supply power value written in the unit is changed to the opposite sign, and it is detected that the sign of the second supply power value is not appropriate, the sign is determined from the measurement start date and time. 4. The sign according to claim 1, wherein the sign of the second supply power value written in the storage unit is changed to an opposite sign over a period until it is detected that the sign is not appropriate. Power measuring device. The code control unit
A comparator that outputs an inappropriate signal indicating that the positive / negative sign is not appropriate when it is detected that the positive / negative sign of the supplied power value is not appropriate based on a comparison between the supplied power value and the generated power value;
5. A flip-flop circuit that starts outputting third control information for controlling the sign of the supplied power value to be opposite to the sign of the supply power value when the inappropriate signal is output. The power measuring device according to any one of the above. When at least one of the first control information and the second control information represents that current cannot be detected, a display unit capable of presenting information indicating that at least power measurement preparation is not completed,
The power measuring device according to any one of claims 1 to 5, further comprising:   The power measuring apparatus according to claim 1, further comprising the voltage sensor. The main-side current sensor and the sub-side current sensor are
A clamp portion provided in the path portion so that a current can be detected;
The power measurement device according to claim 1, further comprising: a signal generation unit that generates control information of any one of the first and second control information. In the aspect provided by the main-side current sensor provided in the path portion on the main power generation device side of the load in the connection path for electrically connecting the main power generation device and the sub power generation device via the load. Outputting first control information indicating an operational status of whether or not measurement is possible, and detecting a current flowing through the path portion;
Second control information representing an operation state indicating whether or not current can be measured in the provided mode is provided by a sub-side current sensor provided in a path portion closer to the sub power generation device than the load in the connection path. , Detecting the current flowing in the path part,
Based on a current detected by the main-side current sensor and a detection result by a voltage sensor provided in the connection path, a supply power value representing a magnitude of power supplied from the main power generation device to the load is calculated. Calculate
Based on the current detected by the sub-side current sensor and the detection result by the voltage sensor, a generated power value representing the magnitude of the power output from the sub power generator is calculated,
The supply power value and the generated power value are stored in an internal or external memory in a manner associated with time information representing the time when the detection result of the voltage sensor used for calculation and the current are detected, respectively. Write to the department,
When it is detected that the sign of the power supply value calculated by the power supply calculation unit is not appropriate using the power supply value and the generated power value, the sign of the power supply value is reversed. Controlling the supply power calculation unit to be a sign,
When it is detected that the sign of the supplied power value is not appropriate, the first control information output from the main-side current sensor and the second control information output from the sub-side current sensor are obtained. Changing the sign of the supply power value written in the storage unit to the opposite sign over a period from the measurement start date and time representing the date and time until it is detected that the sign is not appropriate,
Power measurement method.

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