WO2011070792A1 - Système réparti d'alimentation électrique - Google Patents

Système réparti d'alimentation électrique Download PDF

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Publication number
WO2011070792A1
WO2011070792A1 PCT/JP2010/007207 JP2010007207W WO2011070792A1 WO 2011070792 A1 WO2011070792 A1 WO 2011070792A1 JP 2010007207 W JP2010007207 W JP 2010007207W WO 2011070792 A1 WO2011070792 A1 WO 2011070792A1
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WIPO (PCT)
Prior art keywords
determination
power
current sensor
power supply
value
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PCT/JP2010/007207
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English (en)
Japanese (ja)
Inventor
忍 懸
裕章 加来
佐藤　圭一
洋 永里
大谷　昭仁
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パナソニック株式会社
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Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to JP2011516906A priority Critical patent/JP4820461B2/ja
Priority to US13/203,910 priority patent/US8751055B2/en
Priority to EP10835715.3A priority patent/EP2395362B1/fr
Publication of WO2011070792A1 publication Critical patent/WO2011070792A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers

Definitions

  • the present invention relates to a distributed power supply system that supplies power to a commercial power system and a load in a consumer in connection with the commercial power system.
  • Patent Document 1 Conventionally, as this type of distributed power supply system, there has been a private power generation system disclosed in Patent Document 1.
  • FIG. 10 is a block diagram of a conventional distributed power supply device described in FIG. The reference numerals are changed by the applicant.
  • the conventional distributed power supply system includes current sensors 105a and 105b, a voltage sensor 106, a heater 107, and a control means 108. Further, when the fuel cell device 104 is not generating power and the heater 107 is operated and a current flows, it is calculated from the current value detected by the current sensors 105a and 105b and the voltage value detected by the voltage sensor 106. When the power value is less than or equal to the predetermined value, the control means 108 inverts the sign of the power value calculated thereafter.
  • the determination of the installation direction of the current sensors 105a and 105b may be performed a plurality of times in order to determine the installation direction more reliably.
  • the control means determines the installation direction of the current sensor by detecting the width of the periodic power fluctuation by the heater.
  • the control means detects the small fluctuation range of the power value and the reduction range of the power value to determine the installation direction of the current sensor. Therefore, even if the installation direction of the current sensor is normal, the current sensor is broken or disconnected.
  • the current sensor installation direction cannot be determined correctly because it is erroneously determined that it is in an abnormal state of being disconnected from the wire, or it is erroneously determined that the current sensor installation direction is reversed. was there.
  • whether the current detected by the current sensor by supplying power from the commercial power system to the heater is positive when the fuel cell device is in a non-power generation state. By detecting whether or not, the installation direction of the current sensor is determined. However, the current sensor may be shifted without correcting the zero point.
  • the current value detected by the current sensor may still be negative. In this case, even if the current sensor is attached in the correct installation direction, the current sensor may detect a negative current value and erroneously determine that the installation direction of the current sensor is reverse.
  • the conventional configuration has a problem that the installation state of the current sensor may not be accurately determined.
  • This invention solves the conventional subject, and it aims at providing the distributed power supply system which can determine the installation state of a current sensor more reliably, and can improve the reliability of a system.
  • a distributed power supply system includes a distributed power supply device that supplies power to a consumer load linked to a commercial power grid, and an internal power supply from the commercial power grid.
  • a load a current sensor that detects the magnitude of the current on the commercial power system side relative to the internal load and the consumer load, and a direction of the current, and a controller, the controller being the distributed type
  • the power supply device is not outputting power
  • the internal load is operated, and determination control for determining the installation state of the current sensor based on a detection value of the current sensor is performed a plurality of times , and the plurality of determination controls at least one of the interval for a in the interval other than an integral multiple of the other intervals and performs the determination control.
  • the distributed power supply system of the present invention can more reliably determine the installation state of the current sensor and improve the system reliability.
  • Block diagram of distributed power supply system The flowchart which shows the flow of the current sensor installation state determination in the distributed power supply system of Embodiment 1.
  • Flowchart showing a flow of power calculation and correction in the distributed power supply system of the first embodiment The flowchart which shows the flow of the current sensor installation state determination in the distributed power supply system of Embodiment 2.
  • Block diagram of distributed power supply system in Embodiment 3 The flowchart which shows the flow of the current sensor installation state determination in the distributed power supply system of Embodiment 3.
  • Block diagram of distributed power supply system in Embodiment 5 The flowchart which shows the flow of the current sensor abnormality determination in the distributed power supply system of Embodiment 5.
  • Block diagram of a conventional distributed power supply Schematic diagram illustrating an example of determination control according to Embodiment 1 of the present invention. Schematic diagram illustrating an example of determination control according to Embodiment 1 of the present invention. Schematic diagram illustrating an example of determination control according to Embodiment 1 of the present invention. Schematic diagram illustrating an example of determination control according to Embodiment 1 of the present invention. Schematic diagram illustrating an example of determination control according to Embodiment 1 of the present invention. Schematic diagram illustrating an example of determination control according to Embodiment 1 of the present invention. Schematic diagram illustrating an example of determination control according to Embodiment 1 of the present invention.
  • a first invention includes a distributed power supply device that is connected to a commercial power system and supplies power to a consumer load, an internal load that is supplied with power from the commercial power system, the internal load, and the consumer load
  • a current sensor that detects the magnitude of the current on the commercial power system side and the direction of the current, and a controller, and the controller is configured when the distributed power supply device does not output power.
  • the internal load is operated, determination control for determining the installation state of the current sensor based on the detection value of the current sensor is performed a plurality of times, and at least one of the intervals for performing the plurality of determination controls is set to another interval.
  • This is a distributed power supply system that performs the determination control at intervals other than an integer multiple of.
  • the installation state includes at least one of the installation direction (positive or negative) of the current sensor and the installation state (disconnection, failure of the current sensor, disconnection from the electric wire (dropping, etc.)).
  • the present invention it is possible to determine whether the current sensor is in a state where it cannot be normally detected due to the installation direction of the current sensor and the failure of the current sensor, disconnection, or disconnection from the electric wire regardless of the state of the load in the consumer. It is possible to reliably determine and correct the power value, and the reliability of the system can be improved.
  • a second invention is a distributed power supply system according to the first invention, wherein the controller performs the determination control while changing the interval for performing the determination control a plurality of times at intervals other than integer multiples.
  • the controller performs a first step of performing the determination control a plurality of times at a first interval, and a second step of performing the determination control a plurality of times at a second interval. And determining a determination result of the installation state of the current sensor as each step based on the plurality of determination controls in each step for each step, and at least one of the second intervals
  • the second step is executed so that the first step is an interval other than an integral multiple of the first interval.
  • the present invention it is possible to avoid erroneous determination that occurs when the interval for performing determination control is an integral multiple. Furthermore, the determination can be performed more reliably by executing the step of determining the installation state of the current sensor twice.
  • the fourth invention is a distributed power supply system according to the third invention, wherein the controller executes the second step so that the second intervals are all equal.
  • the controller controls the first and second until the determination result as each step determined in the last plurality of steps becomes the same.
  • This is a distributed power supply system that executes the following steps.
  • the controller controls the first and second until the determination result as each step determined in each step is the same for a predetermined number of times or more.
  • a distributed power supply system that executes steps.
  • a seventh aspect of the invention is a distributed power supply system in which the controller executes the first and second steps until the determination result as each step determined in each step is the same for a certain ratio or more. .
  • the eighth invention is a distributed power supply system according to any one of the fifth to seventh inventions, wherein the controller alternately executes the first and second steps.
  • the ninth invention is the same as that according to any one of the third to eighth inventions, in the first or second step, when the judgment result of the judgment control is the same for a certain number of times.
  • This is a distributed power supply system that determines the determined result as the determined result as the step.
  • a tenth aspect of the invention is the same as that of any one of the third to eighth aspects of the present invention, wherein the determination result of the determination control is the same in a predetermined ratio or more in the first or second step.
  • This is a distributed power supply system that determines the determined result as the determined result as the step.
  • An eleventh aspect of the present invention is the distributed power supply system according to the first aspect, wherein the controller performs the determination control a plurality of times while continuously changing the interval for performing the determination control to an interval other than an integral multiple. is there.
  • a twelfth aspect of the invention is the voltage detector for detecting a voltage of electric power supplied from the commercial power system to at least one of the internal load and the consumer load in any one of the first to eleventh aspects of the invention.
  • the controller further includes a power value calculated from the detection value of the current sensor immediately before the operation of the internal load and the detection value of the voltage detector in the determination control, and immediately after the operation of the internal load.
  • the deviation between the detection value of the current sensor and the power value calculated from the detection value of the voltage detector is not more than a first predetermined value that is a positive power value and not less than a second predetermined value that is a negative power value.
  • the abnormal state of the current sensor means a state where the current sensor cannot be normally detected, such as a failure of the current sensor, disconnection from the electric wire, or disconnection.
  • the present invention it is possible to simultaneously determine whether or not there is a response to the operation of the internal load (such as the presence or absence of a failure) and whether the current sensor is installed in the normal direction.
  • the installation direction of the current sensor can be determined in the case of non-reverse power flow.
  • a thirteenth invention is the voltage detector for detecting a voltage of power supplied from the commercial power system to at least one of the internal load and the consumer load, in any one of the first to eleventh inventions.
  • the controller further includes a power value calculated from the detection value of the current sensor and the detection value of the voltage detector in the determination control that is equal to or less than a third predetermined value that is a positive power value and negative power.
  • a fourth predetermined value it is determined that the installation direction of the current sensor is in an abnormal state, and when the power value is less than the fourth predetermined value, the installation direction of the current sensor is reversed.
  • the distributed power supply system determines that the installation direction of the current sensor is correct when the power value exceeds the third predetermined value.
  • the present invention it is possible to simultaneously determine whether or not there is a response to the operation of the internal load (such as the presence or absence of a failure) and whether the current sensor is installed in the normal direction.
  • the power generation operation can be performed normally without re-installing the current sensor in the normal direction.
  • the fifteenth aspect further includes notifying means for notifying abnormality, and the controller installs the current sensor based on the plurality of times of determination control.
  • This is a distributed power supply system that determines a final determination of a state and notifies the abnormality by controlling the notification means when the final determination cannot be determined within a predetermined time.
  • the current sensor installation direction error, disconnection, dropout (current sensor is disconnected from the electric wire), etc. are reported, and after the system is installed, the current sensor is disconnected, dropped, etc. Can improve the reliability of installation work, maintenance work, and system.
  • the controller executes a first step of performing the determination control a plurality of times at a first interval, and performing the plurality of determinations in the first step. It is determined whether the installation direction of the current sensor is correct based on the control, and when the installation direction of the current sensor is determined, the determination control is terminated, and the installation direction of the current sensor is in an abnormal state.
  • the second step of performing the determination control a plurality of times at a second interval, at least one of which is an interval other than an integer multiple of the first interval, is executed, and the plurality of the second step
  • This is a distributed power supply system that determines whether the installation direction of the current sensor is correct or reverse based on the determination control of the number of times.
  • the controller sets a determination control interval, which is a basis for determining the installation state of the current sensor, as a default interval when the next plurality of determination controls are performed.
  • a determination control interval which is a basis for determining the installation state of the current sensor, as a default interval when the next plurality of determination controls are performed.
  • the installation state of the current sensor can be determined more reliably and quickly.
  • FIG. 1 is a block diagram of a distributed power supply system according to Embodiment 1 of the present invention.
  • a commercial power system 1 that is a single-phase three-wire AC power source composed of a U phase, an O phase, and a W phase includes a consumer load 2 that consumes AC power supplied from the commercial power system 1. Are interconnected.
  • a distributed power supply system 3 connected to the commercial power system 1 includes a distributed power supply 4 that outputs generated power as alternating current power, a load 2 in the consumer, and a distributed power supply 4 that is upstream of the load 2 in the consumer.
  • Current sensors 5a and 5b that detect magnitudes and positive and negative directions of currents installed in the U phase and W phase in the distribution board installed at the power receiving point of the commercial power system 1 (in this embodiment, U A current sensor 5a in the phase and a current sensor 5b in the W phase), a voltage sensor 6 which is a voltage detection means for detecting the voltage of the commercial power system 1, an internal load heater 7, and the internal load heater 7 are turned on and off.
  • a switch 7a a control means (controller) 8 for controlling the distributed power supply system 3, a power integrating meter 9 for integrating the power value, a display means for displaying the power display and the abnormal state of the system, and a notification means. Equipped with a CD10.
  • the control means 8 calculates the power value for each of the U phase and the W phase based on the current value detected by the current sensors 5a and 5b and the voltage value detected by the voltage sensor 6.
  • the negative power flow from the distributed power supply system 3 to the commercial power system 1 is negative
  • the volatile memory 16 for storing the power value calculated by the power calculation unit 11
  • the current sensor Current sensor installation state determination unit 12 that determines the installation state of 5a and 5b
  • nonvolatile memory 13 that stores the determination result of current sensor installation state determination unit 12
  • current sensors 5a and 5b that are stored in nonvolatile memory 13
  • the sign inversion unit 14 corrects the sign of the power value calculated by the power calculation unit 11 based on the installation direction information, and the internal load heater that controls energization to the internal load heater 7 via the switch 7a. It consists of the control unit 15.
  • FIG. 2 is a flowchart showing a flow of current sensor installation direction determination in the distributed power supply system according to the first embodiment of the present invention.
  • FIG. 3 shows power calculation and correction in the distributed power supply system according to the first embodiment of the present invention. It is a flowchart which shows a flow.
  • the control means 8 determines the installation state of the current sensors 5a and 5b when the power is turned on. After the determination of the installation state of the current sensors 5a and 5b is completed, power calculation / correction is always performed, and the artificial change of the installation direction of the current sensors 5a and 5b and the current sensors 5a and 5b are broken, disconnected, or In order to cope with the case where the current sensor 5 is out of the range, the installation state of the current sensors 5a and 5b is periodically determined.
  • the installation state of the current sensors 5a and 5b means at least one of the installation direction of the current sensors 5a and 5b and the state where the current sensors 5a and 5b are broken, disconnected, or disconnected.
  • the control means 8 is controlled by the internal load heater controller 15 through the switch 7a at predetermined intervals (for example, the predetermined interval is preferably 1 to 3 seconds, preferably 1 second, and the predetermined multiple times is preferably 3 to 5 times). 4 times)
  • the internal load heater 7 is turned on and off.
  • the predetermined number of times is three or more times. This is because the error determination due to the power supply to the internal load heater 7 being synchronized with the cycle of the power supply to the consumer load cannot be excluded in the second time. Therefore, this predetermined interval has a plurality of intervals. Of the plurality of intervals in the predetermined interval, one interval is an interval other than an integer multiple of the other intervals.
  • the “cycle” and “interval” of turning on / off (operation) of the internal load heater 7 are originally different only by the operation period (width) of the internal load heater 7, but the operation period (width) of the internal load heater 7 is Since the operation interval is extremely short (for example, 1/5 to 1/20), both are used in the same meaning.
  • control means 8 acquires the current power value immediately before turning on the internal load heater 7 (power calculation is shown in FIG. 3), and stores it in the volatile memory 16.
  • the current sensor installation state determination unit 12 After the internal load heater 7 is turned on, the current sensor installation state determination unit 12 again acquires the current power value (power calculation is shown in FIG. 3), and stores the acquired power value and the volatile memory 16. Based on the stored power value, the installation state of the current sensors 5a and 5b is determined, and the determination result is stored in the nonvolatile memory 13. Various modes of determining the installation state of the current sensors 5a and 5b are assumed and will be described in detail later.
  • the internal load heater Since the power to be supplied to the customer load 2 and the reverse power flow are reduced by turning on 7, the difference between the two power values immediately before and after turning on the internal load heater 7 is also positive, ideally the internal load The power value corresponds to the power consumption value of the heater 7.
  • the installation state determination by the current sensor installation state determination unit 12 is performed as follows based on the difference between the two powers. That is, as this determination criterion, a first predetermined value that is a positive power value and a second predetermined value that is a negative power value are set as threshold values. Then, when the difference between the two electric powers exceeds the first predetermined value, when the predetermined number of times continues for a plurality of times, the installation direction is determined to be a normal direction, and when the difference between the two powers is less than the second predetermined value, the predetermined plural When a plurality of times are consecutive, the installation direction is determined to be the reverse direction. If these conditions are not satisfied, the determination control is continued.
  • the absolute values of the first predetermined value and the second predetermined value are appropriately set in consideration of a margin corresponding to an error with respect to the power consumption of the internal load heater 7 (for example, 40% of the power consumption of the internal load heater 7). It is set to a power value of about 60%).
  • the absolute values of the first predetermined value and the second predetermined value may be the same or different from each other. It goes without saying that setting the absolute value of the difference between two powers as the threshold value for the determination criterion is synonymous with setting the first and second predetermined values having the same absolute value. Absent.
  • this determination information is stored in the nonvolatile memory 13 as installation direction information.
  • the current sensor installation state determination unit 12 repeats the above determination unless these conditions are satisfied. If these conditions are not satisfied within a predetermined time, the current sensor installation state determination unit 12 causes the LCD 10 to malfunction. Is displayed. A specific example of this determination control (method) will be described in detail in the eighth embodiment.
  • FIG. FIGS. 11 to 15 and FIGS. 26 to 32 show changes in power value with time in four stages (referred to as first to fourth stages in order from top to bottom).
  • the vertical axis indicates the power value
  • the horizontal axis indicates time (time).
  • the first stage shows the power value supplied to the consumer load 2
  • the second stage shows the power value supplied to the internal load heater 7,
  • the third stage shows the installation direction of the current sensors 5a and 5b.
  • the power value calculated by the power calculation unit 11 in the case of the normal direction is shown
  • the fourth level shows the power value calculated by the power calculation unit 11 when the installation direction of the current sensors 5a and 5b is the reverse direction. Indicates.
  • One power value of the internal load heater 7 in the second stage indicates a power value in one operation.
  • a group of power values indicates one step for determining the installation state of the current sensors 5a and 5b, and each of the group of power values indicates a single determination of the installation state of the current sensors 5a and 5b in one step.
  • Indicates control. “ ⁇ times” indicates the number of times of each determination control in each step.
  • T ⁇ indicates a determination control interval (cycle) (operation interval of the internal load heater 7).
  • Solid arrows” in the third stage and the fourth stage indicate that the deviation of the power value calculated by the power calculator 11 is positive, and similarly, “broken arrows” indicate the power calculated by the power calculator 11. Indicates that the value deviation is negative.
  • the determination that the positive / negative of the installation direction of the current sensors 5a, 5b and the positive / negative of the deviation of the power value calculated by the power calculation unit 11 is objectively correct, and the installation direction of the current sensors 5a, 5b. It is an objectively incorrect determination that the positive / negative of is negative and the positive / negative of the deviation of the power value calculated by the power calculation unit 11 is opposite.
  • 26 to 32 are schematic diagrams showing determination control (determination method) in proportionality.
  • the deviation of the power value calculated by the power calculation unit 11 should be positive.
  • the supply power value to the consumer load 2 is calculated as a power value immediately before the internal load heater 7 is turned on, and the supply power value to the internal load heater 7 is immediately after the internal load heater 7 is turned on. This is because the deviation of the power value becomes negative.
  • FIG. 33 is a schematic diagram showing a method for determining whether or not the current sensors 5a and 5b are in an abnormal state.
  • whether or not there is a response according to the operation of the internal load heater 7 when determining whether the current sensors 5a and 5b are installed in the normal direction in each determination control. Determine whether.
  • the current sensor Whether the installation direction of 5a, 5b is normal or reverse is determined.
  • the control unit 8 determines that the deviation P of the power value that is the object of determination of the installation state of the current sensors 5a and 5b is equal to or less than the first predetermined value Pt1.
  • the current sensors 5a and 5b are determined to be in an abnormal state.
  • the deviation P of the power value is equal to or greater than the second predetermined value Pt2
  • each determination control includes the determination of whether the current sensors 5a and 5b are installed in the normal direction and the determination whether or not the current sensors 5a and 5b are in an abnormal state.
  • FIG. 11 to FIG. 16 are schematic diagrams illustrating an example of determination control in the present embodiment.
  • the operation (determination control) of the internal load heater 7 is performed at a predetermined interval as described above, and one interval among the plurality of intervals in the predetermined interval is an integral multiple of the other intervals. It is an interval other than.
  • determination control is performed by setting at least one of the plurality of determination control intervals to an interval other than an integer multiple of the other intervals.
  • At least one interval T12 among intervals T11, T12, and T11 for performing a plurality of determination controls is an interval other than an integral multiple of the other intervals T11 and T11.
  • the number of intervals should just be two or more.
  • the number of intervals other than an integral multiple of other intervals is also arbitrary, and they may be continuous or intermittent.
  • the determination control may be performed while changing the interval for performing the determination control a plurality of times at intervals other than integer multiples.
  • the interval may be changed continuously or intermittently.
  • a plurality of intervals T21, T22, T23 may be changed continuously.
  • a plurality of intervals T21, T22, T23 may be changed continuously, and the subsequent intervals T23 may not be changed.
  • determination control may be performed without changing the plurality of intervals T21, T21, and then the plurality of intervals T22, T23 may be changed continuously.
  • the interval T21 may be changed to the interval T22, and thereafter, the interval T22 may be maintained without being changed, and thereafter, this may be changed to the interval T23.
  • the interval for performing the plurality of determination controls always includes two intervals that are different from each other by an interval other than an integer multiple. Even if the power supply to 2 is synchronized, the other interval is not synchronized. Therefore, if the determination control is performed a plurality of times so as to include two different intervals other than the integer multiples as described above, the determination can be performed to include the correct determination. Since the current sensors 5a and 5b cannot detect the current supplied to the internal load heater 7 and the current supplied to the consumer load 2 separately, are the individual determinations obtained really correct? I can't know how.
  • the probability that the interval of the determination control is synchronized with the power supply to the consumer load 2 is very low, if the determination control is performed many times so as to include two different intervals other than an integer multiple, an erroneous determination is made.
  • the probability of succession is considered very low. Therefore, in the present embodiment, when the same determination is continuously obtained a plurality of times, it is assumed that the determination obtained continuously a plurality of times is correct.
  • any of the determination control examples shown in FIG. 11 to FIG. 15 in any of the determination control examples, when the installation direction of the current sensors 5a and 5b is normal, When the deviation of the power value calculated by the calculation unit 11 is positive and the installation direction of the current sensors 5a and 5b is reversed, the deviation of the power value calculated by the power calculation unit 11 is negative. Therefore, in any of the determination control examples, “determination that the forward / reverse of the installation direction of the current sensors 5a and 5b matches the positive / negative of the deviation of the power value” (“coincidence determination”) is obtained four times in succession. The installation direction of the current sensors 5a and 5b can be accurately determined.
  • control means 8 may perform the determination control a plurality of times while continuously changing the interval for performing the determination control to an interval other than an integral multiple. Specifically, for example, as shown in FIG. 25, in one step, the intervals T111, T112, and T113 for performing determination control are continuously changed to intervals other than integer multiples.
  • the number of intervals is an arbitrary number of 2 or more, and the number of steps is an arbitrary number of 2 or more.
  • the control means 8 is calculated from the product of the current value detected by the current sensors 5a and 5b immediately before and after the internal load heater 7 operates and the voltage value detected by the voltage sensor 6.
  • the current sensors 5a and 5b are installed regardless of the non-power generation / power generation state of the distributed power supply device 4 by inverting the sign of the calculated power value thereafter. The direction can be determined and the power value can be corrected, and the reliability of the system can be improved.
  • a commercial power system 1 that is a single-phase three-wire AC power source composed of a U phase, an O phase, and a W phase includes a consumer load 2 that consumes AC power supplied from the commercial power system 1. Are interconnected.
  • a distributed power supply system 3 connected to the commercial power system 1 includes a distributed power supply 4 that outputs generated power as alternating current power, a load 2 in the consumer, and a distributed power supply 4 that is upstream of the load 2 in the consumer.
  • Current sensors 5a and 5b that detect magnitudes and positive and negative directions of currents installed in the U phase and W phase in the distribution board installed at the power receiving point of the commercial power system 1 (in this embodiment, U A current sensor 5a in the phase and a current sensor 5b in the W phase), a voltage sensor 6 which is a voltage detection means for detecting the voltage of the commercial power system 1, an internal load heater 7, and the internal load heater 7 are turned on and off.
  • the control means 8 is a power calculation unit 11 (this book) that calculates power for each of the U phase and the W phase based on the current values detected by the current sensors 5a and 5b and the voltage value detected by the voltage sensor 6.
  • the negative power flow from the distributed power system 3 to the commercial power system 1 is negative)
  • the volatile memory 16 that stores the power value calculated by the power calculation unit 11, the current sensor 5a
  • Current sensor installation state determination unit 12 that determines the installation state of 5b
  • nonvolatile memory 13 that stores the determination result of current sensor installation state determination unit 12, and installation of current sensors 5a and 5b stored in nonvolatile memory 13
  • a sign inverting unit 14 that corrects the sign of the power value calculated by the power calculation unit 11 based on the direction information
  • an internal load heater system that controls energization to the internal load heater 7 via the switch 7a. It made up of part 15.
  • FIG. 4 is a flowchart showing a flow of current sensor installation state determination in the distributed power supply system according to the second embodiment of the present invention.
  • FIG. 3 shows power calculation and correction in the distributed power supply system according to the second embodiment of the present invention. It is a flowchart which shows a flow.
  • the control means 8 determines the installation state of the current sensors 5a and 5b when the power is turned on. After the determination of the installation state of the current sensors 5a and 5b is completed, power calculation / correction is always performed, and the artificial change of the installation direction of the current sensors 5a and 5b and the current sensors 5a and 5b are broken, disconnected, or In order to cope with the case where the current sensor 5 is out of the range, the installation direction of the current sensors 5a and 5b is periodically determined.
  • the control means 8 causes the internal load heater control section 15 to operate the internal load at a first predetermined interval at a first predetermined interval via the switch 7a at a first predetermined interval, and then at a second step, the internal load
  • the internal load heater 7 is turned on and off for a second predetermined number of times at a second predetermined interval.
  • control means 8 acquires the current power value immediately before turning on the internal load heater 7 (power calculation is shown in FIG. 3), and stores it in the volatile memory 16.
  • the current sensor installation state determination unit 12 again acquires the current power value (power calculation is shown in FIG. 3), and stores the acquired power value and the volatile memory 16. Based on the stored power value, the installation state of the current sensors 5a and 5b is determined, and the determination result is stored in the nonvolatile memory 13.
  • the distributed power supply 4 is in the power generation state, if the electric current is supplied to the consumer load 2 or in the case of reverse power flow, if the current sensors 5a and 5b are installed in the normal direction, the internal load heater Since the power supplied to the customer load 2 and the power flowing backward are reduced by turning ON 7, the difference between the two power values immediately before and immediately after turning on the internal load heater 7 is positive, ideally The power value corresponds to the power consumption value of the internal load heater 7.
  • the determination of the installation state by the current sensor installation state determination unit 12 is performed as follows based on the difference between the two powers and the first and second predetermined values described in the first embodiment.
  • the first step it is determined whether the difference between the two powers exceeds the first predetermined value in a first predetermined plurality of times, and in the second step, a plurality of second predetermined plurality of times. If it is determined whether the first step and the second step are continuous a plurality of times, the installation direction is determined as the positive direction.
  • the installation direction is determined to be a negative direction. Furthermore, it is determined in the first step whether the time equal to or smaller than the first predetermined value and equal to or greater than the second predetermined value continues a plurality of times among the first predetermined multiple times, and the second predetermined multiple times in the second step.
  • the current sensor is determined to be continuous a plurality of times, and it is determined that both the first step and the second step are continued a plurality of times, it is determined that the current sensor is in an abnormal state, and the information is stored in the nonvolatile memory 13.
  • the current sensor installation state determination unit 12 repeats the first step and the second step unless these conditions are satisfied. In addition, when these conditions are not satisfied within a predetermined time, the current sensor installation state determination unit 12 performs display for notifying the LCD 10 of the abnormality.
  • this determination control determination method
  • the power calculation and correction is performed based on the installation direction information of the current sensors 5a and 5b newly stored in the nonvolatile memory 13, and the power integrating meter 9 integrates the power based on the correction result.
  • the LCD 10 displays power.
  • [Mode for determining installation state of current sensors 5a and 5b] 16 to 25 are schematic diagrams illustrating an example of determination control according to the present embodiment. The description regarding these drawings is the same as that described with reference to FIGS. 11 to 15 and FIGS.
  • the above-mentioned “first predetermined interval” is hereinafter referred to as “first interval”
  • the above “second predetermined interval” is hereinafter referred to as “second interval”.
  • the determination of the installation state of the current sensors 5a and 5b in the present embodiment is executed in any one of the following modes, or in an appropriate combination thereof (a combination that does not exclude each other).
  • the determination is made, it is always determined whether or not the current sensors 5a and 5b are in an abnormal state at the same time. That is, each determination control includes the determination of whether the current sensors 5a and 5b are installed in the normal direction and the determination whether or not the current sensors 5a and 5b are in an abnormal state.
  • the control means 8 includes a first step of performing the determination control of the installation state of the current sensors 5a and 5b a plurality of times at the first interval, and a second step of performing the determination control a plurality of times at the second interval. And a determination result of the installation state of the current sensors 5a and 5b as each step is determined for each step based on a plurality of determination controls in each step, and at least one of the second intervals
  • the second step is performed such that the interval is an interval other than an integer multiple of the first interval. That is, the plurality of intervals in the first and second steps are predetermined, but the intervals are different from each other except for an integral multiple. Either the first step or the second step may be performed first.
  • the number of determination controls may be different between the first step and the second step, and the number of executions and the order of the first step and the second step are arbitrary.
  • the first interval in the first step is a constant T31, and one of the second intervals in the second step is other than an integral multiple.
  • T32 may be different from the first interval T31, and another interval of the second intervals may be the same T31 as the first interval.
  • the first interval in the first step is a constant T31, and the two intervals among the second intervals in the second step are other than integer multiples, and the first interval T31.
  • T32 and T33 which are different from each other, and the other of the second intervals may be T31 which is the same as the first interval.
  • This mode can avoid erroneous determination that occurs when the interval for performing determination control is an integral multiple. Furthermore, the determination can be performed more reliably by executing the step of determining the installation state of the current sensors 5a and 5b twice.
  • control means 8 performs the second step so that the second intervals are all equal.
  • the first intervals in the first step may be all constant T41
  • the second intervals in the second step may be all constant T42.
  • This mode can simplify the judgment control.
  • control means 8 performs the first and second steps until the determination results as the respective steps determined in the last plurality of steps become the same.
  • the power supply to the internal load heater 7 and the power supply to the consumer load 2 are not synchronized in both the first and second steps.
  • the first step of the first time it becomes “determination in which the positive / negative of the direction of installation of the current sensors 5a and 5b coincides with the positive / negative of the deviation of the power value” (“coincidence determination”).
  • the determination result as the first step is “match determination”.
  • the second step and the first step for the second time are also “coincidence determination” four times in succession, the determination results as the second step and the first step for the second time are “match”, respectively. It becomes “determination”.
  • the control means 8 ends the determination control at this point.
  • the third step may be executed.
  • the determination results here, “matching determination”
  • the control unit 8 ends the determination control when the second first step ends.
  • the number of “last multiple times” may be 4 or more. As the number of “last multiple times” is increased, the accuracy of the determination is improved, but the time until a final determination result is obtained increases.
  • the power supply to the internal load heater 7 and the power supply to the consumer load 2 are synchronized in the first step as in the determination control example shown in FIGS. 20A and 20B. It is assumed that “last multiple times” is defined as “last two times”.
  • the determination result as the first step is “reverse determination”.
  • the determination control intervals T52 and T53 are different from the determination control interval T51 in the first step. Therefore, the determination result as the second step is “match determination”.
  • the control means 8 executes the second first step.
  • the state is likely to continue. Becomes “match judgment”.
  • the determination results as the respective steps determined in the “last two times” step are the same, so the control means 8 ends the determination control. In this case, the final determination is “match determination”.
  • FIG. 20B illustrates a case where it is determined in the first step that the current sensors 5a and 5b are in an abnormal state.
  • the power value deviation is not more than the first predetermined value and not less than the second predetermined value in the first step of the first time, and the “current sensors 5a, 5b It becomes “determination in abnormal state”. Therefore, the determination result as the first step is “determination that the current sensors 5a and 5b are in an abnormal state”.
  • the second step some of the determination control intervals T52 and T53 are different from the determination control interval T51 in the first step. Therefore, the determination result as the second step is “match determination”.
  • the control means 8 executes the second first step.
  • the state is likely to continue. Becomes “match judgment”.
  • the determination results as the respective steps determined in the “last two times” step are the same, so the control means 8 ends the determination control. In this case, the final determination is “match determination”.
  • the determination control examples shown in FIGS. 21 and 22 are the same as the determination control examples shown in FIGS. 19, 20A, and 20B, except that the first and second steps correspond to the mode 2. The description is omitted.
  • This mode can more reliably determine the installation state of the current sensor.
  • control means 8 performs the first and second steps until the determination result as each step determined in each step is the same for a certain number of times.
  • the number of times of determination control may be different between the first step and the second step.
  • the aspect of “same for a certain number of times or more” may be a form of “same for a certain number of times continuously” or a form of “same for a certain number of times intermittently”.
  • This mode can more reliably determine the installation state of the current sensor.
  • control means 8 performs the first and second steps until the determination result as each step determined in each step becomes the same by a certain ratio or more.
  • the number of times of determination control may be different between the first step and the second step.
  • This mode can more reliably determine the installation state of the current sensor.
  • control means 8 alternately executes the first step and the second step.
  • This mode can more reliably determine the installation state of the current sensor.
  • control means 8 performs the determination control a plurality of times while continuously changing the interval for performing the determination control to an interval other than an integral multiple.
  • intervals T111, T112, and T113 for performing determination control are continuously changed to intervals other than an integral multiple in each step.
  • the number of intervals is an arbitrary number of 2 or more, and the number of steps is an arbitrary number of 2 or more.
  • This mode can more reliably determine the installation state of the current sensor.
  • the control unit 8 executes a first step in which the determination control is performed a plurality of times at the first interval, and based on the plurality of determination controls in the first step.
  • the determination control is terminated when the installation direction of the current sensors 5a and 5b is determined, and it is determined that the current sensors 5a and 5b are in an abnormal state.
  • the second step of performing the determination control a plurality of times at a second interval that is an interval other than an integer multiple of the first interval is executed, and the determination control is performed a plurality of times in the second step. Is used to determine whether the installation direction of the current sensors 5a, 5b is correct or reversed.
  • This mode can more reliably determine the installation state of the current sensor.
  • the control means 8 calculates based on the current value detected by the current sensors 5a and 5b immediately before and after the internal load heater 7 operates and the voltage value detected by the voltage sensor 6. If the deviation of the power value to be performed is less than the second predetermined value, the current sensor 5a, It is possible to determine the installation state of 5b and to correct the power value, thereby improving the reliability of the system.
  • FIG. 5 is a block diagram of the distributed power supply system according to the third embodiment.
  • a commercial power system 1 that is a single-phase three-wire AC power source composed of a U phase, an O phase, and a W phase includes a consumer load 2 that consumes AC power supplied from the commercial power system 1. Are interconnected.
  • the distributed power supply system 3 linked to the commercial power system 1 has a distributed power supply device 4 that outputs generated power as AC power. Further, the consumer load 2 is connected to a power line connecting the distributed power supply 4 and the commercial power system 1. A distribution board is installed at a power receiving point between the distributed power supply 4 and the commercial power system 1 upstream of the consumer load 2.
  • Current sensors 5a and 5b (in this embodiment, the current sensor 5a is installed in the U phase and the current sensor 5b is installed in the W phase) for detecting the magnitude and positive / negative direction of the current, and the U phase and W in the distribution board Installed in the phase.
  • the distributed power system 3 includes a voltage sensor 6 that is a voltage detection unit that detects the voltage of the commercial power system 1 and an internal load heater 7 that heats water by consuming surplus power generated by the distributed power device 4.
  • an LCD 10 as a notification means.
  • the control means 8 calculates the power value for each of the U phase and the W phase by integrating the current value detected by the current sensors 5a and 5b and the voltage value detected by the voltage sensor 6, for example.
  • 11 in this embodiment, the negative flow is when the power flow from the distributed power system 3 to the commercial power system 1 is negative
  • the current sensor installation state determination unit 12 that determines the installation direction of the current sensors 5a and 5b
  • the non-volatile memory 13 that stores the determination result of the current sensor installation state determination unit 12 and the power value calculated by the power calculation unit 11 based on the installation direction information of the current sensors 5 a and 5 b stored in the non-volatile memory 13.
  • a sign inverting unit 14 that corrects the positive / negative sign and an internal load heater control unit 15 that controls energization to the internal load heater 7 via the switch 7a.
  • FIG. 6 is a flowchart showing a flow of current sensor installation state determination in the distributed power supply system according to the third embodiment of the present invention.
  • FIG. 3 shows power calculation and correction in the distributed power supply system according to the first embodiment of the present invention. It is a flowchart which shows a flow.
  • FIG. 5 The operation and action of the distributed power supply system configured as described above will be described below with reference to FIGS. 5, 3, and 6.
  • FIG. 5 The operation and action of the distributed power supply system configured as described above will be described below with reference to FIGS. 5, 3, and 6.
  • control means 8 determines the installation state of the current sensors 5a and 5b just before the distributed power supply device 4 starts power generation, as in the first or second embodiment.
  • the control means 8 controls the switch 7a in the internal load heater control unit 15 so that power is supplied from the commercial power system 1 toward the distributed power supply device 4 when the distributed power supply device 4 is in a non-power generation state.
  • the internal load heater 7 is turned on and off at predetermined intervals (for example, the predetermined interval is 1 to 3 seconds, preferably 1 second, and the predetermined multiple times is 3 to 5 times, preferably 4 times). However, the predetermined number of times is three or more times. This is because the error determination due to the power supply to the internal load heater 7 being synchronized with the cycle of the power supply to the consumer load cannot be excluded in the second time. Therefore, this predetermined interval has a plurality of intervals.
  • one interval is an interval other than an integer multiple of the other intervals.
  • the current sensor installation state determination unit 12 determines the installation state of the current sensors 5a and 5b, and stores the determination result for each of the U phase and the W phase in the nonvolatile memory 13.
  • the internal load heater 7 is turned on so that electric power is supplied from the commercial power system 1 toward the distributed power supply device 4, so that the current sensors 5a and 5b are installed in the normal direction. If so, the power value calculated by the power calculation unit 11 is positive and ideally should be a power value corresponding to the power consumption value of the internal load heater 7.
  • the determination of the installation direction by the current sensor installation state determination unit 12 is performed as follows based on the power value calculated by the power calculation unit 11. That is, as this determination criterion, a third predetermined value that is a positive power value and a fourth predetermined value that is a negative power value are set as threshold values. When the power value exceeds the third predetermined value, the installation direction is determined to be a normal direction when a plurality of predetermined times are consecutive, and when the power value is less than the fourth predetermined value, the predetermined multiple times Of these, the installation direction is determined to be the reverse direction when it is continued a plurality of times, and if these conditions are not satisfied, the determination control is continued.
  • the absolute values of the third predetermined value and the fourth predetermined value are appropriately set in consideration of a margin corresponding to an error with respect to the power consumption of the internal load heater 7 (for example, 40% of the power consumption of the internal load heater 7). It is set to a power value of about 60%).
  • the absolute values of the third predetermined value and the fourth predetermined value may be the same or different. Needless to say, setting the absolute value of the power value as the threshold value of the determination criterion is synonymous with setting the third and fourth predetermined values having the same absolute value.
  • this determination information is stored in the nonvolatile memory 13 as installation direction information.
  • the current sensor installation state determination unit 12 repeats the above determination unless these conditions are satisfied. If these conditions are not satisfied within a predetermined time, the current sensor installation state determination unit 12 causes the LCD 10 to malfunction. Is displayed. A specific example of this determination control (method) will be described in detail in the eighth embodiment.
  • the mode of determination of the installation state of the current sensors 5a and 5b uses the power value calculated by the power calculation unit 11 instead of the deviation of the power value calculated by the power calculation unit 11 as a determination criterion for the current sensor installation state. Since it is the same as that of Embodiment 1 except for a point, the description is abbreviate
  • the LCD 10 displays power.
  • the power calculation method is to acquire a current value with the current sensors 5a and 5b, acquire a voltage value with the voltage sensor 6, and acquire a current value for each of the U phase and the W phase with the power calculation unit 11. Power calculation is performed by calculating from integration based on the value and the voltage value.
  • the power correction method is such that the power value calculated by the power calculation unit 11 when the current sensor installation information stored in the nonvolatile memory 13 in the sign inversion unit 14 is in the reverse direction for each of the U phase and the W phase. Multiply (-1) to invert the sign of the power value.
  • the control means 8 detects the current sensors 5a and 5b when a current flows due to the operation of the internal load heater 7 in the non-power generation state of the distributed power supply device 4.
  • the power value calculated based on the current value and the voltage value detected by the voltage sensor 6 is less than the fourth predetermined value, the sign of the power value calculated thereafter is reversed, so that the situation of the consumer load 2 Regardless, it is possible to determine the installation state of the current sensors 5a and 5b, correct the power value, and improve the reliability of the system.
  • a commercial power system 1 that is a single-phase three-wire AC power source composed of a U phase, an O phase, and a W phase includes a consumer load 2 that consumes AC power supplied from the commercial power system 1. Are interconnected.
  • a distributed power supply system 3 connected to the commercial power system 1 includes a distributed power supply 4 that outputs generated power as alternating current power, a load 2 in the consumer, and a distributed power supply 4 that is upstream of the load 2 in the consumer.
  • Current sensors 5a and 5b that detect magnitudes and positive and negative directions of currents installed in the U phase and W phase in the distribution board installed at the power receiving point of the commercial power system 1 (in this embodiment, U A current sensor 5a in the phase and a current sensor 5b in the W phase), a voltage sensor 6 which is a voltage detection means for detecting the voltage of the commercial power system 1, an internal load heater 7, and the internal load heater 7 are turned on and off.
  • control means 8 is a power calculation unit 11 that calculates power for each of the U phase and the W phase based on the product of the current value detected by the current sensors 5a and 5b and the voltage value detected by the voltage sensor 6 (this embodiment).
  • a negative flow is assumed when the power flow from the distributed power system 3 to the commercial power system 1 is negative
  • a current sensor installation state determination unit 12 that determines the installation state of the current sensors 5a and 5b
  • a current sensor installation state The non-volatile memory 13 for storing the determination result of the determination unit 12 and the sign of the power value calculated by the power calculation unit 11 based on the information on the installation direction of the current sensors 5a and 5b stored in the non-volatile memory 13 are corrected.
  • an internal load heater control unit 15 that controls energization to the internal load heater 7 via the switch 7a.
  • FIG. 7 is a flowchart showing a flow of current sensor installation state determination in the distributed power supply system according to the fourth embodiment of the present invention.
  • FIG. 3 shows power calculation and correction in the distributed power supply system according to the fourth embodiment of the present invention. It is a flowchart which shows a flow.
  • FIG. 5 The operation and action of the distributed power supply system configured as described above will be described below with reference to FIGS. 5, 3, and 7.
  • FIG. 5 The operation and action of the distributed power supply system configured as described above will be described below with reference to FIGS. 5, 3, and 7.
  • control means 8 determines the installation state of the current sensors 5a and 5b immediately before the distributed power supply device 4 starts power generation.
  • the control means 8 controls the switch 7a in the internal load heater control unit 15 so that power is supplied from the commercial power system 1 toward the distributed power supply device 4 when the distributed power supply device 4 is in a non-power generation state.
  • the internal load is operated for a first predetermined number of times at a first predetermined fixed interval in a first step, and then the internal load is operated for a second predetermined number of times at a second predetermined interval in a second step. Cut 7
  • the current sensor installation state determination unit 12 determines the installation state of the current sensors 5a and 5b, and stores the determination result for each of the U phase and the W phase in the nonvolatile memory 13.
  • the internal load heater 7 is turned on so that electric power is supplied from the commercial power system 1 toward the distributed power supply device 4, so that the current sensors 5a and 5b are installed in the normal direction. If so, the power value calculated by the power calculation unit 11 is positive and ideally should be a power value corresponding to the power consumption value of the internal load heater 7.
  • the determination of the installation direction by the current sensor installation state determination unit 12 is performed as follows based on the power value calculated by the power calculation unit 11 and the third and fourth predetermined values described in the third embodiment. .
  • the power value exceeds the third predetermined value, it is determined in the first step whether the first predetermined number of times is continued a plurality of times, and in the second step, the second predetermined number of times is continued a plurality of times.
  • the installation direction is determined to be the positive direction.
  • the installation direction is determined to be a negative direction. Further, it is determined in the first step whether the time equal to or smaller than the third predetermined value and equal to or greater than the fourth predetermined value continues among the first predetermined multiple times in the first step, and the second predetermined multiple times in the second step.
  • the current sensor is determined to be continuous a plurality of times, and it is determined that both the first step and the second step are continued a plurality of times, it is determined that the current sensor is in an abnormal state, and the information is sent to the nonvolatile memory 13.
  • the current sensor installation state determination unit 12 repeats the first step and the second step unless these conditions are satisfied. In addition, when these conditions are not satisfied within a predetermined time, the current sensor installation state determination unit 12 performs display for notifying the LCD 10 of the abnormality.
  • a specific example of this determination control (determination method) will be described in detail in Embodiment 8.
  • the mode of determination of the installation state of the current sensors 5a and 5b uses the power value calculated by the power calculation unit 11 instead of the deviation of the power value calculated by the power calculation unit 11 as a determination criterion for the current sensor installation direction. Except for this point, the description is omitted because it is the same as the second embodiment.
  • the LCD 10 displays power.
  • the power calculation method is to acquire a current value with the current sensors 5a and 5b, acquire a voltage value with the voltage sensor 6, and acquire a current value for each of the U phase and the W phase with the power calculation unit 11.
  • the power calculation is performed by integration based on the value and the voltage value.
  • the power correction method is such that the power value calculated by the power calculation unit 11 when the current sensor installation information stored in the nonvolatile memory 13 in the sign inversion unit 14 is in the reverse direction for each of the U phase and the W phase. Multiply (-1) to invert the sign of the power value.
  • the control means 8 detects the current sensors 5a and 5b when a current flows due to the operation of the internal load heater 7 in the non-power generation state of the distributed power supply device 4.
  • the power value calculated from the current value and the voltage value detected by the voltage sensor 6 is less than the fourth predetermined value, the sign of the calculated power value is reversed thereafter, so that regardless of the situation of the consumer load 2
  • the installation state of the current sensors 5a and 5b can be determined, the power value can be corrected, and the reliability of the system can be improved.
  • FIG. 8 shows a block diagram of a distributed power supply system according to Embodiment 5 of the present invention.
  • the distributed power supply system 3 includes a switch 18 that is a setting unit
  • the control unit 8 includes, in addition to the configuration of FIG. 5, an installation failure or disconnection of the current sensors 5 a and 5 b, A current sensor abnormality determination unit 17 that determines a failure and a time measurement unit 19 that measures time are provided.
  • FIG. 9 is a flowchart showing a flow of current sensor failure abnormality determination in the distributed power supply system of the fifth embodiment.
  • FIG. 8 The operation and action of the distributed power supply system 3 configured as described above will be described below with reference to FIGS. 8, 9, and 3.
  • FIG. 8 The operation and action of the distributed power supply system 3 configured as described above will be described below with reference to FIGS. 8, 9, and 3.
  • the control means 8 operates the switch 18 to respond to the change of the installation direction of the artificial current sensors 5a and 5b immediately before the distributed power supply 4 starts the power generation or the current sensors 5a, In order to deal with the failure of 5b, the abnormality determination of the current sensors 5a and 5b is performed periodically (for example, every 24 hours) based on the time measured by the time measuring unit 19.
  • the control means 8 performs time measurement by the time measurement unit 19 and obtains an operation signal of the switch 18. Based on this information, the time measured by the time measuring unit 19 is periodically received (for example, every 24 hours) or when a signal corresponding to an abnormality determination execution command for the current sensors 5a and 5b is received from the switch 18 (this In the embodiment, the switch 18 outputs a normal LOW signal and outputs an HI signal when pressed to perform abnormality determination), clears the time measurement of the time measurement unit 19 and acquires the current power value. The power value is stored in the volatile memory 16 (the power calculation is shown in FIG. 3). Then, the internal load heater controller 15 turns on the internal load heater 7 via the switch 7a.
  • the current sensor abnormality determination unit 17 After the internal load heater 7 is turned on, the current sensor abnormality determination unit 17 again acquires the current power value (power calculation is shown in FIG. 3) and stores the acquired power value and the volatile memory 16. The abnormality determination of the current sensors 5a and 5b is performed based on the power value to be performed.
  • the distributed power supply 4 is in a non-power generation / power generation state, or in a power generation state, regardless of non-reverse power flow / reverse power flow, if there is a faulty installation, disconnection, or failure of the current sensors 5a, 5b, the internal load
  • the difference between the two power values immediately before and after the heater 7 is turned on Is ideally 0.
  • the abnormality determination by the current sensor abnormality determination unit 17 takes into account the measurement errors of the current sensors 5a and 5b and the voltage sensor 6, and the difference between the two powers is within a predetermined value (-100 W to 100 W in the present embodiment). It is determined that the current sensors 5a and 5b are abnormal.
  • the internal load heater control unit 15 turns off the internal load heater 7 via the switch 7a, and if there is an abnormality in the current sensors 5a, 5b, the abnormality information is sent to the LCD 10. And an abnormality display of the current sensor is performed on the LCD 10.
  • the control unit 8 calculates based on the current value detected by the current sensors 5a and 5b immediately before and after the internal load heater 7 operates and the voltage value detected by the voltage detection unit.
  • the deviation of the power value to be performed is within a predetermined value, it is determined that the current sensor is in an abnormal state, and the LCD 10 notifies an abnormality when the control means 8 determines that the current sensors 5a and 5b are in an abnormal state. Therefore, it is possible to know the installation failure of the current sensors 5a and 5b during installation work and maintenance work, and to know the disconnection and failure of the current sensors 5a and 5b after system installation. Reliability can be improved.
  • the control means 8 since the control means 8 operates the internal load heater 7 based on the operation command from the switch 18, the installation state of the current sensors 5a and 5b is always at the time of installation work / maintenance work. It is possible to detect abnormalities due to installation problems such as determination of power and correction of power values, disconnection / dropping of the current sensors 5a, 5b, and the installation work / maintenance work can be performed smoothly.
  • control means 8 measures time measurement and periodically operates the internal load heater 7, and therefore periodically determines the installation direction of the current sensors 5 a and 5 b and the power value. It is possible to detect an abnormality such as correction, failure of the current sensors 5a and 5b, disconnection / dropping, and the like, and the reliability of the system can be improved.
  • the information processing device further includes a notification unit that notifies abnormality
  • the control unit 8 is a current sensor based on a plurality of determination controls.
  • the notification means is controlled to notify the abnormality.
  • the predetermined time is appropriately set in consideration of, for example, the startup time of the distributed power supply device 4.
  • the abnormality notification means may be, for example, the LCD 10, a speaker, an alarm lamp, or other abnormality notification device (not shown).
  • the control means 8 sets the determination control interval that is the basis for determining that the installation state of the current sensors 5a and 5b is correct. It is stored in a storage means (not shown), and is set as a default interval for the next determination control.
  • the distributed power supply system consumes AC power with an internal load and reliably supplies power from the commercial power system to the distributed power supply apparatus, regardless of the load situation in the consumer. Because it can determine the installation state of the current sensor and correct the power value and improve the reliability of the system, it can be distributed like fuel cell device, solar power generation device, wind power generation device, solar thermal power generation device The present invention can also be applied to applications such as mold power supply devices.

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Abstract

La présente invention concerne un système réparti d'alimentation électrique comprenant : un dispositif réparti d'alimentation électrique (4) qui, en coopération avec un système d'alimentation du commerce (1), fournit de l'énergie à une charge de consommateurs (2) ; une charge interne (7) à laquelle une énergie est fournie par le système d'alimentation du commerce ; un capteur de courant (5a, 5b) qui détecte la magnitude du courant et la direction du courant sur le côté plus près du système d'alimentation du commerce que de la charge interne et de la charge de consommateurs ; et un dispositif de commande (8). Lorsque le dispositif réparti d'alimentation électrique (4) ne produit pas d'énergie, le dispositif de commande (8) fait fonctionner la charge interne (7), exécute une commande de détermination permettant de déterminer l'état d'installation du capteur de courant (5a, 5b) sur la base de la valeur de détection du capteur de courant (5a, 5b) de multiples fois, et exécute la commande de détermination, au moins un des intervalles auxquels ladite commande est exécutée de multiples fois étant paramétré sur un intervalle différent des multiples entiers des autres intervalles.
PCT/JP2010/007207 2009-12-10 2010-12-10 Système réparti d'alimentation électrique WO2011070792A1 (fr)

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JP2011516906A JP4820461B2 (ja) 2009-12-10 2010-12-10 分散型電源システム
US13/203,910 US8751055B2 (en) 2009-12-10 2010-12-10 Distributed power supply system
EP10835715.3A EP2395362B1 (fr) 2009-12-10 2010-12-10 Système réparti d'alimentation électrique

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JP2012186027A (ja) * 2011-03-07 2012-09-27 Ngk Spark Plug Co Ltd 燃料電池システム
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US8751055B2 (en) 2014-06-10
JPWO2011070792A1 (ja) 2013-04-22

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