JP2017135848A - Power conditioner and distributed power source system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely activate a load of a high priority with power that is supplied from an autonomous operation output terminal.SOLUTION: A power conditioner 100 comprises: a first autonomous operation output terminal 107 and a second autonomous operation output terminal 108; an inverter 102; a first current sensor 105 for detecting a first current that the inverter 102 outputs; a second current sensor 106 for detecting a second current to be supplied to any one of the first autonomous operation output terminal 107 and the second autonomous operation output terminal 108; a control section 111 which issues a caution or stops operating the inverter 102 in the case where the first current becomes equal to or higher than a predetermined first threshold or the second current becomes equal to or higher than a predetermined second threshold; and a storage section 109. The control section 111 controls the inverter 102 in accordance with a current to flow to the autonomous operation output terminal at a low-priority side and a current of a load that is connected to the autonomous operation output terminal at a high-priority side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power conditioner and a distributed power supply system.

  2. Description of the Related Art A distributed power supply system that connects power generated by a distributed power supply such as a solar cell to a system is known.

  Usually, direct-current power generated by a solar cell is converted into alternating-current power by a power conditioner and connected to the grid.

  In the event of a power failure in the system, it is desirable that the power generated by the solar cell can be supplied to a specific load with high importance. For this reason, many power conditioners have a self-sustaining operation function, and are provided with a self-sustaining operation output terminal for supplying power to a specific load in the event of a power failure.

  When the self-sustained operation output terminal is an outlet terminal, the rated current is often 15 A, but the power conditioner usually has a supply capacity of 15 A or more. Therefore, a power conditioner including a plurality of independent operation output terminals is also known (for example, Patent Document 1).

JP 2014-158391 A

  When the inverter is equipped with multiple independent operation output terminals, if the sum of the currents supplied from multiple independent operation output terminals exceeds the rated current of the inverter, it will be used for overcurrent protection or overload protection. The inverter will stop operating.

  For example, it is assumed that the power conditioner includes two outlet terminals as independent operation output terminals, each having a rated current of 15A, and the rated current of the power conditioner being 27A. In this case, when the sum of the currents supplied to the two outlet terminals reaches 27A, the power conditioner stops its operation, so that no current is supplied to the outlet terminals whose supplied current was less than 15A. .

  Therefore, for example, when a load with a high priority and a load with a low priority are connected to the inverter, if the load with a low priority is activated and operated first, the rating of the inverter is Due to current limitation, loads with high priority may not be activated.

  An object of the present invention made in view of such a point is to provide a power conditioner and a distributed power supply system capable of reliably starting a load having a high priority by electric power supplied from an independent operation output terminal.

  A power conditioner according to an embodiment of the present invention includes a first autonomous operation output terminal and a second autonomous operation output terminal that can supply power to a connected load during autonomous operation, and converts DC power into AC power. An inverter that supplies AC power to the first autonomous operation output terminal and the second autonomous operation output terminal, a first current sensor that detects a first current output by the inverter, and the first autonomous operation output terminal. And a second current sensor for detecting a second current supplied to any one of the second self-sustained operation output terminals, and the first current exceeds a predetermined first threshold, or the second current is A control unit that issues a warning or controls to stop the operation of the inverter when it is equal to or greater than a predetermined second threshold, and any of the first autonomous operation output terminal and the second autonomous operation output terminal Out The control unit is connected to a current flowing through the low-priority self-sustained operation output terminal and the high-priority self-sustained operation output terminal. The inverter is controlled according to the current of the load to be applied.

  In addition, a distributed power supply system according to an embodiment of the present invention is a distributed power supply system including a power conditioner and a power control device capable of controlling the operation of a load connected to the power conditioner. The first autonomous operation output terminal and the second autonomous operation output terminal capable of supplying electric power to the connected load during the autonomous operation, and converts the DC power into AC power, and the first autonomous operation output terminal And an inverter that supplies AC power to the second autonomous operation output terminal, a first current sensor that detects a first current output from the inverter, the first autonomous operation output terminal, and the second autonomous operation output terminal. A second current sensor for detecting a second current supplied to either one of the first current and the first current is equal to or greater than a predetermined first threshold, or the second current is a predetermined second threshold; In the case of the above, whether to give priority to the output of the control unit that issues a warning or stops the operation of the inverter, and the first autonomous operation output terminal or the second autonomous operation output terminal Storage unit for storing the priority of the current, the control unit of the current flowing in the independent operation output terminal of the lower priority side, and the load connected to the independent operation output terminal of the higher priority side The inverter is controlled in accordance with the current, and the power control device controls the starting order of the load connected to the first autonomous operation output terminal and the load connected to the second autonomous operation output terminal. It is characterized by doing.

  According to the power conditioner and the distributed power supply system according to the embodiment of the present invention, it is possible to reliably start a load having a high priority by the electric power supplied from the independent operation output terminal.

1 is a diagram illustrating a schematic configuration of a distributed power supply system according to a first embodiment of the present invention. It is a flowchart which shows an example of operation | movement of the distributed power supply system which concerns on 1st Embodiment of this invention. It is a flowchart which shows the other example of operation | movement of the distributed power supply system which concerns on 1st Embodiment of this invention. It is a figure which shows schematic structure of the distributed power supply system which concerns on 2nd Embodiment of this invention. It is a figure which shows schematic structure of the distributed power supply system which concerns on 3rd Embodiment of this invention. It is a figure which shows schematic structure of the distributed power supply system which concerns on 4th Embodiment of this invention.

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

[First Embodiment]
FIG. 1 is a diagram showing a schematic configuration of a distributed power supply system 1 according to the first embodiment of the present invention. In FIG. 1, a solid line connecting each functional block mainly indicates a power line, and a broken line mainly indicates a communication line or a signal line.

  The distributed power supply system 1 includes a power conditioner 100, a solar battery 10, a display device 20, a general load 30, and specific loads 40 and 50.

  The power conditioner 100 is used in connection with the system 60. The power conditioner 100 performs a self-sustained operation by opening the interconnection relay 103 and closing the independent relay 104 in the event of a power failure in the system 60, and converts the DC power supplied from the solar cell 10 into AC power. Supply to specific loads 40 and 50. In addition, the power conditioner 100 can usually sell the power by converting the DC power supplied from the solar cell 10 into AC power and flowing it back to the grid 60 (electric power company). Details of the configuration and functions of the inverter 100 will be described later. The reverse power flow refers to flowing power from the power conditioner 100 side to the grid 60 side.

  The solar cell 10 generates DC power from sunlight energy and supplies it to the power conditioner 100. The solar cell 10 is shown as an example of a distributed power source, and may be another type of distributed power source, for example, a fuel cell or a power storage device.

  The display device 20 displays information received from the power conditioner 100. The display device 20 may be, for example, a remote controller with a display unit for the power conditioner 100 or a communication terminal such as a smartphone. In FIG. 1, the display device 20 is illustrated as an external device of the power conditioner 100, but the display device 20 may be a display unit included in the power conditioner 100.

  The general load 30 is, for example, an electrical device connected to the system 60. FIG. 1 shows a configuration in which one general load 30 is connected between the U phase and the O phase, and one general load 30 is connected between the W phase and the O phase. The general load 30 connected between the W phase and the O phase may be two or more.

  The specific load 40 is an electric device connected to the first independent operation output terminal 107 of the power conditioner 100, and the specific load 50 is an electric device connected to the second independent operation output terminal 108 of the power conditioner 100. Etc. The specific loads 40 and 50 are highly important electric devices that are operated at the time of a power failure of the system 60, and are, for example, a charger or a television of a portable terminal.

  Next, the configuration and functions of the power conditioner 100 will be described in detail. The power conditioner 100 includes a DC / DC converter 101, an inverter 102, an interconnection relay 103, a self-supporting relay 104, a first current sensor 105, a second current sensor 106, and a first self-sustained operation output terminal 107. The 2nd independent operation output terminal 108, the memory | storage part 109, the communication part 110, and the control part 111 are provided.

  The DC / DC converter 101 steps up or steps down the voltage of the direct current power supplied from the solar cell 10 and supplies it to the inverter 102.

  The inverter 102 converts the DC power supplied from the DC / DC converter 101 into AC power, and supplies AC power to the general load 30 or sells the power to the system 60 via the interconnection relay 103 during normal operation. Can do. Further, the inverter 102 supplies AC power to the specific loads 40 and 50 via the self-supporting relay 104 during the self-supporting operation.

  The interconnection relay 103 turns on / off the connection between the inverter 102 and the system 60 under the control of the control unit 111.

  The autonomous relay 104 turns on / off connection between the inverter 102 and the first autonomous operation output terminal 107 and the second autonomous operation output terminal 108 under the control of the control unit 111.

  The first current sensor 105 detects a current output from the inverter 102.

  The second current sensor 106 detects a current supplied to the first independent operation output terminal 107, that is, a current supplied to the specific load 40.

  The first self-sustained operation output terminal 107 is a terminal that supplies power to the specific load 40 when the power conditioner 100 performs self-sustained operation during a power failure or the like. The first self-sustained operation output terminal 107 can have any configuration as long as it is a terminal capable of supplying electric power, and is, for example, an outlet terminal.

  The second self-sustained operation output terminal 108 is a terminal through which the power conditioner 100 supplies power to the specific load 50 during a self-sustained operation such as during a power failure. The second self-sustained operation output terminal 108 can take any configuration as long as it is a terminal capable of supplying power, and is, for example, a terminal block. The terminal block is usually set to have a higher rated current than the outlet terminal.

  The storage unit 109 stores priority information regarding which of the power supply to the first autonomous operation output terminal 107 and the power supply to the second autonomous operation output terminal 108 is prioritized during the autonomous operation. I remember it. The priority may be an initial setting or may be set by the user. The storage unit 109 is provided separately from the control unit 111 in FIG. 1, but may be configured as a part of the control unit 111.

  The communication unit 110 is connected to the display device 20 by wire or wireless and communicates with the display device 20. The communication unit 110 transmits information to be displayed on the display device 20 to the display device 20. The communication unit 110 is provided separately from the control unit 111 in FIG. 1, but may be configured as a part of the control unit 111.

  The control unit 111 controls and manages the entire power conditioner 100, and can be configured by a processor, for example.

  The control unit 111 controls the interconnection relay 103 to be in an open state during the independent operation, and disconnects the power conditioner 100 from the system 60. In addition, the control unit 111 controls the self-supporting relay 104 to be in a closed state during the self-sustained operation, and supplies the power generated by the solar cell 10 to the first self-sustained operation output terminal 107 and the second self-sustained operation output terminal 108. .

  The control unit 111 controls the inverter 102 so as to output AC 200V during normal operation, and controls the inverter 102 so as to output AC 100V during self-sustained operation.

  The control unit 111 acquires the value of the current output from the inverter 102 (hereinafter also referred to as “first current”) from the first current sensor 105, and the first independent operation output terminal 107 and the second current sensor 106. The value of the current (hereinafter also referred to as “second current”) supplied to one of the second independent operation output terminals is acquired. In this example, the second current is a current value acquired by the second current sensor 106. The control unit 111 subtracts the value of the second current from the acquired value of the first current, whereby the current supplied to the second autonomous operation output terminal 108 or the first autonomous operation output terminal 107 (hereinafter, “third A value of current).

  For overcurrent protection, the control unit 111 detects the first current value acquired from the first current sensor 105 equal to or greater than a predetermined threshold value (first threshold value), or the first current value acquired from the second current sensor 106. When the value of the two currents or the value obtained by subtracting the value of the second current from the value of the first current is equal to or greater than a predetermined threshold (second threshold), the display device 20 issues a warning or the operation of the inverter 102 Control to stop. Here, the first threshold is normally the rated current of the inverter 102 and is 27 A in the following description, but is not limited to this and can be set as appropriate.

  For example, the second threshold value can be set to the rated current of the independent operation output terminal having a high priority. Specifically, for example, when the first autonomous operation output terminal 107 has a high priority setting, and the second current sensor 106 is disposed on the first autonomous operation output terminal 107 side, the second threshold value is The rated current of the 1 self-sustained operation output terminal 107 can be used. When the second current sensor 106 is disposed on the second autonomous operation output terminal 108 side, the current value obtained by subtracting the current value of the second current sensor 106 from the current value of the first current sensor 105 is independent. Used as the current value of the operation output terminal 107.

  In the following description, it is assumed that the first autonomous operation output terminal 107 is an outlet terminal and the second autonomous operation output terminal 108 is a terminal block. It is assumed that the rated current of the first self-sustained operation output terminal 107 which is an outlet terminal is 15A. However, the rated current of the first self-sustained operation output terminal 107 is 15 A, which is a value in a steady state, and the inrush current is allowed to exceed 15 A for a short time when the specific load 40 is activated. I will do it. In the following description, it is assumed that the first autonomous operation output terminal 107 is set as an autonomous operation output terminal having a higher priority than the second autonomous operation output terminal 108.

  As described above, when the value of the second current acquired from the second current sensor 106 is equal to or greater than the second threshold, the control unit 111 issues a warning on the display device 20 or stops the operation of the inverter 102. . Since the rated current of the first self-sustained operation output terminal 107, which is an outlet terminal, is 15A, the control unit 111 sets the value of the second threshold value to 15A in a stable state after the specific load 40 is activated. However, there are not a few cases where the specific load 40 causes a large current to flow temporarily as an inrush current when starting up.

  The control unit 111 enables the activation of the specific load 40 in which only the inrush current exceeds 15A and the current consumption is less than 15A in the stable state. Is set to a predetermined current value (for example, 25 A) larger than 15 A, and after the elapse of a predetermined time, the second threshold value is set to 15 A. Hereinafter, a predetermined time after activation of the specific load 40 in which the second threshold is set to a large value to allow the inrush current is also referred to as “first time”. In addition, the time when the first load elapses after the specific load 40 is activated and the specific load 40 is in a stable operation state is also referred to as “second time”. The first time can be set to, for example, a value of 100 msec or more and 2 sec or less as a time for the inrush current to sufficiently converge, but is not limited thereto. Even when the first time is exceeded (even when the second time is reached), if the second threshold value is exceeded, a warning sound is emitted from the display device 20, a warning is displayed on the display device 20, or the inverter is forcibly The operation of 102 is stopped.

  Thus, the control unit 111 has two values, the second threshold for the first time and the second threshold for the second time, as the second threshold. The second threshold value for the first time set corresponding to the inrush current of the specific load 40 is larger than the second threshold value for the second time. In the following description, it is assumed that the second threshold for the first time is 25A and the second threshold for the second threshold is 15A.

  In the autonomous operation, the control unit 111 is configured such that the specific load 40 connected to the first autonomous operation output terminal 107 having a high priority is connected to the second autonomous operation output terminal 108 having a low priority. The current supplied to the second self-sustained operation output terminal 108 is limited so as not to be disabled due to the operation.

The control unit 111 limits the current supplied to the second autonomous operation output terminal 108, that is, the third current so as not to exceed a value obtained by subtracting the second threshold value for the first time from the first threshold value. When a current sensor is also disposed at the second autonomous output terminal 108 (not shown), the current value of the current sensor may be used as it is as the third current value. A description will be given assuming that the current is measured only by the sensor 105 and the second current sensor 106. That is,
3rd current ≤ 27A-25A = 2A
The third current is limited so that The value of the upper limit value of the third current calculated in this way is hereinafter also referred to as “third threshold value”. In the following embodiments, it is assumed that the current is measured only by the first current sensor 105 and the second current sensor 106.

  In the state where the specific load 40 is not activated, that is, the value of the second current acquired from the second current sensor 106 is zero, the control unit 111 sets the value of the third current flowing in the specific load 50 to the third threshold value. When (2A) or more is reached, a warning (for example, a warning such as “This load exceeds the allowable power consumption”) is displayed on the display device 20, and the user stops the specific load 50 or the specific load. Reduces power consumption by 50. Alternatively, the control unit 111 determines that the value of the third current flowing through the specific load 50 is the first value when the specific load 40 is not activated, that is, the value of the second current acquired from the second current sensor 106 is zero. When it becomes 3 threshold values (2A) or more, the operation of the inverter 102 is stopped.

  Next, an example of the operation of the power conditioner 100 according to the first embodiment will be described with reference to the flowchart shown in FIG.

  The control unit 111 reads the priority set by the user from the storage unit 109, and sets the priority (step S101). Here, the priority may be stored in the storage unit 109 as an initial value. In the description of FIG. 2, it is assumed that the first autonomous operation output terminal 107 is stored as an autonomous operation output terminal having a higher priority than the second autonomous operation output terminal 108.

  The control unit 111 reads out the first threshold value and the second threshold value stored in advance as set values from the storage unit 109 (step S102). Here, it is assumed that the first threshold is 27A. The second threshold for the first time is 25A, and the second threshold for the second time is 15A.

  The control unit 111 calculates the third threshold value by subtracting the second threshold value for the first time from the first threshold value (step S103). The third threshold value is 27A-25A = 2A.

  The control unit 111 calculates the third current by subtracting the second current acquired from the second current sensor 106 from the first current acquired from the first current sensor 105, and whether the third current is equal to or greater than the third threshold value. It is determined whether or not (step S104).

  When the third current is greater than or equal to the third threshold (Yes in Step S104), the control unit 111 displays a warning on the display device 20 and prompts the user to stop the operation of the specific load 50 (Step S105). Instead of displaying a warning on the display device 20, the control unit 111 may stop the operation of the inverter 102 simultaneously with the warning display and prompt the user to stop the operation of the specific load 50. Thereafter, the control unit 111 proceeds to step S106.

  When the third current is less than the third threshold (No in Step S104), the control unit 111 proceeds to Step S106.

  When the specific load 40 is activated, the control unit 111 sets the threshold value of the second current to 25A that is the second threshold value for the first time (step S106).

  The control unit 111 acquires the first current from the first current sensor 105, and determines whether or not the first current is greater than or equal to the first threshold (27A) (step S107).

  In step S107, when the first current is less than the first threshold (No in step S107), the control unit 111 acquires the second current from the second current sensor 106, and the second current is the second threshold (25A). It is determined whether or not this is the case (step S108).

  In step S108, when the second current is less than the second threshold (No in step S108), the control unit 111 determines whether or not a first time has elapsed since the activation of the specific load 40 (step S109).

  In step S109, when the first time has not elapsed (No in step S109), the control unit 111 returns to step S108.

  In step S109, when the first time has elapsed (Yes in step S109), the control unit 111 changes the second threshold value to 15A, which is a value for the second time (step S110).

  The control unit 111 determines whether the second current is equal to or greater than the second threshold (15A) (step S111).

  In step S111, when the second current is less than the second threshold (No in step S111), the control unit 111 ends the process.

  In step S107, if the first current is greater than or equal to the first threshold value (Yes in step S107), if the second current is greater than or equal to the second threshold value in step S108 (Yes in step S108), and in step S111 When the second current is equal to or greater than the second threshold (Yes in Step S111), the control unit 111 stops the inverter 102 and stops the self-sustained operation output, and then ends the process (Step S112). In addition, the control part 111 returns an independent operation output after predetermined time (for example, 300 second) progress after a self-sustained operation output stops.

  As described above, according to the present embodiment, the control unit 111 controls the display device 20 when the third current supplied to the specific load 50 from the second autonomous operation output terminal 108 having a low priority is equal to or greater than the third threshold. A warning is displayed or the inverter 102 is stopped. Thereby, it can prevent that the specific load 40 with high priority cannot be started by supplying an electric current to the specific load 50 with low priority.

  Further, according to the present embodiment, the control unit 111 sets the second threshold value for the first time to a value larger than the second threshold value for the second time. As a result, it is possible to prevent the specific load 40 having a high priority from being unable to start due to only the inrush current.

(Setting of third threshold considering actual inrush current)
In the above setting, the second threshold value for the first time is set to a fixed value of 25 A as a value considering the inrush current. However, the actual inrush current value of the specific load 40 may be a value smaller than 25A, for example, 20A. In such a case, even if the second threshold for the first time is set to 20A and the third threshold is set to 27A-20A = 7A, the specific load 40 can be activated. That is, a larger value can be assigned to the second independent operation output terminal 108 as the third threshold value. Therefore, the control unit 111 may store the maximum value of the second current during the first time in the storage unit 109, and set this value as the second threshold for the first time.

  With reference to the flowchart shown in FIG. 3, an example of operation | movement of the power conditioner 100 which concerns on 1st Embodiment in this case is demonstrated. In the following, the flow in FIG. 3 that is the same as that in FIG. 2 will be omitted as appropriate, and the content different from that in FIG. 2 will be mainly described.

  In step S <b> 202, the control unit 111 reads the first threshold value stored as the setting value from the storage unit 109. In addition, the control unit 111 stores the value stored in the storage unit 109 as the maximum current value during the first time when the specific load 40 was activated last time as the second threshold value for the first time (this value). Read 20A in the description). If the specific load 40 has not been activated before, the control unit 111 reads an initial value (for example, 25A) as the second threshold value for the first time.

  In step S203, the control unit 111 calculates a third threshold value by subtracting the second threshold value for the first time from the first threshold value. The third threshold value is 27A-20A = 7A.

  Steps S204 to S208 are the same processes as steps S104 to S108 in FIG.

  In step S209, the control unit 111 causes the storage unit 109 to store the second current for the first time. At this time, the control unit 111 stores the value of the second current in the storage unit 109 so as to be updated to the maximum value in the loop from step S208 to step S210. That is, the control unit 111 executes Step S209 so that the maximum current value during the first time is stored in the storage unit 109 as the inrush current value of the specific load 40.

  In step S211, the control unit 111 changes the second threshold value for the first time to the maximum second current value stored in step S209. For example, when the maximum current value stored in the storage unit 109 in step S209 is 17A, the second threshold value for the first time is changed from 20A to 17A. This value is read out in the next process of step S202. When the specific load 40 is stopped (current = 0), the maximum current value may increase due to replacement of the load device, etc., so the value of the second threshold value is temporarily returned to the initial value. It is good to do so.

  Steps S212 to S214 are the same processes as steps S110 to S112 in FIG.

  As described above, the control unit 111 calculates the third threshold value in consideration of the actual inrush current of the specific load 40, thereby ensuring the condition that the specific load 40 can be activated, and the specific load 50 having a low priority. The allocated current can be increased.

(Priority setting)
The priority stored in the storage unit 109 is not fixed and may be changed by user settings. For example, in the above description, the first autonomous operation output terminal 107 to which the specific load 40 is connected is described as having a high priority, but the second autonomous operation output terminal 108 to which the specific load 50 is connected is described. You may set a high priority. In this case, the value of the second threshold value is calculated by subtracting the third threshold value for the first time from the first threshold value.

  Also, the priority may be set to switch according to time by timer setting. This makes it possible to reliably start a specific load required at a required time. The start of the timer setting can be set, for example, to the start of independent operation. Specifically, the switching of the time can be set when a predetermined time has elapsed since the start of the independent operation.

(Relaxing the third threshold condition)
In the state where the specific load 40 is not activated and the second current is zero, when the specific load 50 having a low priority is activated, the definition of the first threshold is applied to the specific load 50 as well as the specific load 40. Then, during the first time after the specific load 50 is activated, the third threshold value is allowed to a value (for example, 27 A) larger than the normal third threshold value (2 A) in consideration of the inrush current. You may do it. Thereby, it is possible to prevent the specific load 50 from being inhibited from starting only due to the inrush current. If the value is larger than the normal third threshold value even at the second time, the operation of the inverter 102 is stopped. At this time, if a warning is displayed on the display device 20, the user can recognize that the loads cannot be used in combination.

[Second Embodiment]
FIG. 4 is a diagram showing a schematic configuration of the distributed power supply system 2 according to the second embodiment of the present invention. In FIG. 4, the solid lines connecting the functional blocks mainly indicate power lines, and the broken lines mainly indicate communication lines or signal lines.

  The distributed power supply system 2 includes a power conditioner 100, a solar cell 10, a display device 20, a general load 30, specific loads 40 and 50, and a power control device 70.

  In the second embodiment, portions that are different from the first embodiment will be mainly described, and description of contents that are the same as or similar to those of the first embodiment will be omitted as appropriate.

  The second embodiment is different from the first embodiment in that the distributed power supply system 2 includes a power control device 70.

  The power control device 70 is, for example, an EMS (Energy Management System) or a demand controller. The power control device 70 is connected to the power conditioner 100 and the specific loads 40 and 50 by wire or wireless, and for example, the power conditioner 100 and the specific loads 40 and 50 by a predetermined communication protocol such as ECHONET Lite (registered trademark). Communicate with.

  The control unit 111 can control the activation order of the specific loads 40 and 50 by transmitting a command to the power control device 70 via the communication unit 110. For example, the control unit 111 can control the specific loads 40 and 50 not to be activated at the same time.

  When the inrush currents of the specific loads 40 and 50 flow simultaneously, the probability that the first current becomes equal to or higher than the first threshold and both the specific loads 40 and 50 cannot be activated increases. By controlling so that 40 and 50 do not start simultaneously, the probability that specific load 40 and 50 can start can be raised.

  At this time, if the low-priority autonomous operation output terminal side is activated first, it is determined whether or not the load exceeds the third threshold, and then the high-priority autonomous operation output terminal side. Can be activated in advance, and a situation where a warning to the user or the operation of the inverter 102 is stopped can be avoided in advance.

[Third Embodiment]
FIG. 5 is a diagram showing a schematic configuration of the distributed power supply system 3 according to the third embodiment of the present invention. In FIG. 5, a solid line connecting the functional blocks mainly indicates a power line, and a broken line mainly indicates a communication line or a signal line.

  The distributed power supply system 3 includes a power conditioner 100, a solar battery 10, a display device 20, a general load 30, and specific loads 40 and 50.

  In the third embodiment, portions that are different from the first embodiment will be mainly described, and description of contents that are the same as or similar to those of the first embodiment will be omitted as appropriate.

  The power conditioner 100 according to the third embodiment is different from the power conditioner 100 according to the first embodiment in that it includes not only the self-supporting relay 104 but also the self-supporting relay 112. In the third embodiment, the self-supporting relay 104 turns on / off the connection between the inverter 102 and the first self-sustained operation output terminal 107 under the control of the control unit 111. The self-supporting relay 112 turns on / off the connection between the inverter 102 and the second self-sustained operation output terminal 108 under the control of the control unit 111.

  When the first current is equal to or higher than the first threshold, the power conditioner 100 according to the third embodiment opens the self-sustained relay that connects the self-sustained operation output terminal with the lower priority and the inverter 102. Switch.

  For example, when the priority of the first autonomous operation output terminal 107 is higher than that of the second autonomous operation output terminal 108, the control unit 111 switches the autonomous relay 112 to the open state when the first current becomes equal to or higher than the first threshold value. Further, for example, when the priority of the second autonomous operation output terminal 108 is higher than that of the first autonomous operation output terminal 107, the control unit 111 switches the autonomous relay 104 to the open state when the first current becomes equal to or higher than the first threshold value. .

  In this way, when the first current becomes equal to or greater than the first threshold, the control unit 111 switches the self-supporting relay that connects the self-supporting operation output terminal with the lower priority and the inverter 102 to the open state. The specific load with the higher priority can be surely activated if it does not exceed the second threshold value only with its own current consumption.

[Fourth Embodiment]
FIG. 6 is a diagram showing a schematic configuration of a distributed power supply system 4 according to the fourth embodiment of the present invention. In FIG. 6, the solid lines connecting the functional blocks mainly indicate power lines, and the broken lines mainly indicate communication lines or signal lines.

  The distributed power supply system 4 includes a power conditioner 100, a solar battery 10, a display device 20, a general load 30, and specific loads 40 and 50.

  In the fourth embodiment, portions that are different from the first embodiment will be mainly described, and description of contents that are the same as or similar to those of the first embodiment will be omitted as appropriate.

  In the power conditioner 100 according to the fourth embodiment, the second current sensor 106 measures the current supplied to the second autonomous operation output terminal 108 instead of the current supplied to the first autonomous operation output terminal 107. This is different from the power conditioner 100 according to the first embodiment.

  In the fourth embodiment, the control unit 111 acquires the third current from the second current sensor 106, and calculates the second current by subtracting the third current from the first current. The processing using the second current and the third current is the same in the fourth embodiment and the first embodiment.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each component, each step, etc. can be rearranged so that there is no logical contradiction, and multiple components, steps, etc. can be combined or divided into one It is. Further, although the present invention has been described mainly with respect to the apparatus, the present invention is a method including steps executed by each component of the apparatus, a method executed by a processor included in the apparatus, a program, or a storage medium storing the program. It should be understood that these can also be realized and are included in the scope of the present invention.

  In the above description, the first threshold value has been described using specific numerical values such as 27A. However, these specific numerical values are merely used as examples, and the numerical values used in the above description. It is not limited to. In the above description, the first current sensor 105 and the second current sensor 106 are used to calculate the third current. However, a third current sensor that measures the third current may be provided to directly acquire a numerical value.

1, 2, 3, 4 Distributed power supply system 10 Solar cell 20 Display device 30 General load 40 Specific load 50 Specific load 60 System 70 Power control device 100 Power conditioner 101 DC / DC converter 102 Inverter 103 Linkage relay 104 Autonomous relay 105 First current sensor 106 Second current sensor 107 First autonomous operation output terminal 108 Second autonomous operation output terminal 109 Storage unit 110 Communication unit 111 Control unit 112 Independent relay

Claims (12)

A first autonomous operation output terminal and a second autonomous operation output terminal capable of supplying electric power to a connected load during the autonomous operation;
An inverter that converts direct current power into alternating current power and supplies alternating current power to the first independent operation output terminal and the second independent operation output terminal;
A first current sensor for detecting a first current output from the inverter;
A second current sensor for detecting a second current supplied to any one of the first autonomous operation output terminal and the second autonomous operation output terminal;
When the first current exceeds a predetermined first threshold value or when the second current exceeds a predetermined second threshold value, a warning is issued or the operation of the inverter is stopped. A control unit;
A storage unit that stores a priority of which one of the outputs of the first autonomous operation output terminal and the second autonomous operation output terminal is prioritized;
The control unit controls the inverter according to a current flowing through the low-priority self-sustained operation output terminal and a load current connected to the high-priority self-sustained operation output terminal. Power conditioner characterized by   2. The power conditioner according to claim 1, wherein the control unit causes a current flowing in the independent operation output terminal on the lower priority side to flow from the first threshold to the independent operation output terminal on the higher priority side. A power conditioner that controls the inverter so as not to exceed a value obtained by subtracting a current value set corresponding to an inrush current of a connected load.   The power conditioner according to claim 2, wherein the current value set corresponding to an inrush current of a load connected to the high-priority self-sustained operation output terminal is a predetermined current value set in advance. A power conditioner characterized by   The power conditioner according to claim 2, wherein the control unit stores a value of an inrush current at the time of starting a load connected to the high-priority self-sustained operation output terminal in the storage unit, and then The value of the inrush current stored in the storage unit is used as the current value set corresponding to the inrush current of a load connected to the self-sustained operation output terminal on the higher priority side. Conditioner.   5. The power conditioner according to claim 2, wherein the control unit is configured such that a current flowing through the low-priority self-sustained operation output terminal is higher in priority than the first threshold value. A power conditioner which stops the operation of the inverter when a value obtained by subtracting a current value set corresponding to an inrush current of a load connected to the self-sustained operation output terminal on the side is exceeded.   5. The power conditioner according to claim 2, wherein the control unit is configured such that a current flowing through the low-priority self-sustained operation output terminal is higher in priority than the first threshold value. A warning is displayed on the display device connected to the inverter when the current value set corresponding to the inrush current of the load connected to the self-sustained operation output terminal is exceeded. Power conditioner to do. In the power conditioner of any one of Claim 2 to 4,
A first relay capable of switching a connection between the inverter and the first autonomous operation output terminal to an open state or a closed state;
A second relay capable of switching the connection between the inverter and the second independent operation output terminal to an open state or a closed state;
The control unit corresponds to an inrush current of a load connected to the high-priority self-sustained operation output terminal from the first threshold, when the current flowing through the low-priority self-sustained operation output terminal A power conditioner that switches a relay connected to a low-priority self-sustained operation output terminal to an open state when a value obtained by subtracting a set current value is exceeded.   The power conditioner according to any one of claims 1 to 7, wherein the control unit sets the second threshold value for a predetermined time after a load connected to the first autonomous operation output terminal is activated. A power conditioner that is set to a value larger than the normal value.   The power conditioner according to any one of claims 1 to 8, wherein the control unit switches the priority according to a timer setting. A distributed power supply system comprising a power conditioner and a power control device capable of controlling the operation of a load connected to the power conditioner,
The inverter is
A first autonomous operation output terminal and a second autonomous operation output terminal capable of supplying electric power to a connected load during the autonomous operation;
An inverter that converts direct current power into alternating current power and supplies alternating current power to the first independent operation output terminal and the second independent operation output terminal;
A first current sensor for detecting a first current output from the inverter;
A second current sensor for detecting a second current supplied to any one of the first autonomous operation output terminal and the second autonomous operation output terminal;
When the first current exceeds a predetermined first threshold value or when the second current exceeds a predetermined second threshold value, a warning is issued or the operation of the inverter is stopped. A control unit;
A storage unit that stores a priority of which one of the outputs of the first autonomous operation output terminal and the second autonomous operation output terminal is prioritized;
The control unit controls the inverter according to a current flowing through the low-priority self-sustained operation output terminal and a load current connected to the high-priority self-sustained operation output terminal,
The power control apparatus controls a starting order of a load connected to the first autonomous operation output terminal and a load connected to the second autonomous operation output terminal.   The distributed power supply system according to claim 10, wherein the control unit causes a current flowing through the low-priority side self-sustained operation output terminal from the first threshold value to the high-priority self-sustained operation output terminal. The distributed power supply system, wherein the inverter is controlled so as not to exceed a value obtained by subtracting a current value set corresponding to an inrush current of a connected load. 12. The distributed power supply system according to claim 10, wherein the power control device does not simultaneously activate a load connected to the first autonomous operation output terminal and a load connected to the second autonomous operation output terminal. As described above, the start-up sequence is controlled.

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