JP2015195655A - Power Conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conditioner capable of supplying a load with as much electric power as possible while avoiding excessive electric power supply to the load beyond its capacity.SOLUTION: A power conditioner includes: an electric power conversion part which converts DC electric power into single-phase AC electric power; an electric power supply line including a first electric power line comprising a first voltage line and a neutral line and a second electric power line comprising a second voltage line and a neutral line; a current measurement part which measures a current value of the first electric power line and a current value of the second electric power line; a voltage measurement part which measures a voltage value between the first voltage line and neutral line and a voltage value between the second voltage line and neutral line; and a control part. The control part includes an electric power calculation part which calculates a total electric power value based upon the respective current values and voltage values; and an instruction part which instructs the electric power conversion part to stop output of the single-phase AC electric power to one of the first electric power line and the second electric power line when the total electric power value is equal to or larger than a first threshold.

Description

  The present invention relates to a power conditioner, and more particularly to a power conditioner configured to be able to convert DC power into single-phase AC power.

  2. Description of the Related Art In recent years, distributed power supply systems including solar cells, fuel cells, and storage batteries such as lithium ion batteries, which have little impact on the environment from the viewpoint of protecting the global environment, have been widely used in ordinary homes. A power conditioner used in such a distributed power supply system uses a DC power generated by a solar cell or a fuel cell to convert an AC according to the frequency and voltage of a single-phase three-wire commercial system by an electric power company using an inverter. It is converted into electric power and supplied to household AC electrical equipment connected to the commercial system. The power conditioner also has a function of reversely flowing surplus power to the commercial system, and conversely, a function of converting the power of the commercial system into DC power and charging the storage battery.

  For example, Japanese Unexamined Patent Application Publication No. 2003-284355 (Patent Document 1) discloses a solar power generation system. This system includes a solar battery, a solar power conditioner having an inverter and a grid interconnection protection device, and a commercial power source. The inverter obtains an input current value of the inverter, and when the input current value of the inverter becomes larger than the rated input current value of the inverter, an abnormality is detected and the inverter is stopped.

  Japanese Unexamined Patent Publication No. 2000-102265 (Patent Document 2) discloses a power conversion device for photovoltaic power generation. In this power converter, a plurality of capacitors are connected in series between DC input sections, a switch is provided between the connection section of these capacitors and the output line of the inverter circuit, and this switch is opened and closed according to the system power supply. Thus, the control of the inverter circuit can be switched.

JP 2003-284355 A JP 2000-102265 A

  However, according to the technique of Patent Document 1, when the input current value of the inverter becomes larger than the rated input current value and an abnormality is detected, the inverter stops. For this reason, all AC outputs converted by the inverter are stopped, and no power is supplied to loads such as commercial power supplies and electric devices.

  Further, according to the technique of Patent Document 2, the control of the inverter circuit is switched by opening and closing the switch, but a countermeasure when an abnormality occurs during output from the inverter is not considered.

  The present invention has been made to solve the above-described problems, and supplies as much power as possible to the load while avoiding excessive power supply beyond its capacity to the load. An object is to provide a power conditioner capable of achieving the above.

  According to an embodiment, a power conditioner connected to a direct current power source is provided. The power conditioner includes a power converter that converts DC power output from a DC power source into single-phase AC power, a first power line composed of a first voltage line and a neutral line, and a second voltage. A power supply line that supplies single-phase AC power output from the power converter, a current value of the first voltage line, and a second voltage A current measuring unit for measuring a current value of the wire, a voltage measuring unit for measuring a voltage value between the first voltage line and the neutral line, and a voltage value between the second voltage line and the neutral line And a control unit that controls the power conversion unit. The control unit adds the power value of the first power line and the power value of the second power line based on each current value measured by the current measurement unit and each voltage value measured by the voltage measurement unit. When the total power value is equal to or greater than a predetermined first threshold value, the output of the single-phase AC power to at least one of the first power line and the second power line is calculated. And an instruction unit that instructs the power conversion unit to stop.

  According to the present invention, it is possible to supply as much power as possible to the load while avoiding excessive power supply exceeding the capacity of the power conditioner to the load.

It is a figure which shows schematically the whole structure of the electric power supply system with which the power conditioner according to Embodiment 1 is applied. It is the schematic which shows the structure of the power conditioner according to Embodiment 1. FIG. FIG. 3 is a schematic diagram showing a configuration of a control unit according to the first embodiment. It is a figure for demonstrating the influence on an electric equipment when the electric power supply to one phase stops. It is a figure for demonstrating the influence on an electric equipment when the electric power supply to the other phase stops. 6 is a flowchart for illustrating a processing procedure of a control unit according to the first embodiment. FIG. 7 is a schematic diagram showing a configuration of a control unit according to a second embodiment. 10 is a flowchart for illustrating a processing procedure of a control unit according to the second embodiment. FIG. 12 is a schematic diagram showing a configuration of a control unit according to a third embodiment. It is a figure which shows an example of the relationship between each electric power value before and after total electric power becomes more than a total electric power setting value, and the phase where electric power supply is stopped. 12 is a flowchart for illustrating a processing procedure of a control unit according to the third embodiment. It is a schematic diagram which shows the structure of the control part according to Embodiment 4. It is a figure which shows the other example of the relationship between each electric power value before and after total electric power becomes more than a total electric power setting value, and the phase where electric power supply is stopped. 10 is a flowchart for illustrating a processing procedure of a control unit according to the fourth embodiment. It is the schematic which shows the structure of the power conditioner according to Embodiment 5. FIG. FIG. 10 is a schematic diagram showing a configuration of a control unit according to a fifth embodiment. 10 is a flowchart for illustrating a processing procedure of a control unit according to a fifth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.
[Embodiment 1]
<Overall configuration>
FIG. 1 is a diagram schematically showing an overall configuration of a power supply system to which a power conditioner according to the first embodiment is applied.

  Referring to FIG. 1, the power supply system includes a power conditioner 100, a solar cell 200, a distribution board 400, a pole transformer 800, and a plurality of loads (electrical equipment, for example, provided in a house). , Air conditioner 300A, electric fan 300B, vacuum cleaner 300C, and refrigerator 300D). A part of the power supply system is installed in a house such as a house or an office, for example. Note that the electrical device is not limited to these, and may be a television, a personal computer, a microwave oven, or the like.

  The power system 900 is composed of, for example, a 6.6 kV high-voltage distribution line. The pole transformer 800 transforms AC power supplied from the power system 900 at a high voltage of 6.6 kV into a low voltage power of AC 200 V (AC 100 V is two phases) and supplies it to the home via the single-phase three-wire power line 3. To do.

  The power line 3 includes a voltage line L1, a voltage line L2, and a neutral line N. The power line 3 is wired in the house through the distribution board 400, and is connected between any two of the grounded neutral line N and the voltage lines L1 and L2 on both sides. Supply power to electrical equipment.

  The voltage between the voltage line L1 and the neutral line N (hereinafter also referred to as “L1 phase”) and the voltage between the voltage line L2 and the neutral line N (hereinafter also referred to as “L2 phase”) are AC100V. Is connected to an AC100V electric device. In the example of FIG. 1, the fan 300B and the cleaner 300C are connected to the L1 phase, and the refrigerator 300D is connected to the L2 phase. The voltage between the voltage line L1 and the voltage line L2 is AC200V, and an AC200V electric device such as an air conditioner 300A is connected between them.

  In other words, the AC100V electrical equipment includes a power line composed of the voltage line L1 and the neutral line N (hereinafter also referred to as “L1-phase power line”) or a voltage line L2 and the neutral line N. Power is supplied from a power line (hereinafter also referred to as “L2-phase power line”). In addition, since the electric device for AC200V is connected to the voltage line L1 and the voltage line L2, power is supplied to the electric device via the L1 phase power line and the L2 phase power line.

  The power conditioner 100 converts the DC power generated by the solar cell 200 into AC power, and supplies the AC power to an electrical device that is a load in the house via the power line 3. The power conditioner 100 is configured to be able to receive (purchase) AC power from the power system 900 and to reversely flow (sell power) to the power system 900. A detailed configuration of the power conditioner 100 will be described later.

  The solar cell 200 is composed of a crystalline solar cell, a polycrystalline solar cell, a thin film solar cell, or the like. For example, a DC / DC converter (not shown) is connected between the solar cell 200 and the power conditioner 100. The DC / DC converter converts the DC power received from the solar cell 200 into a voltage. The DC / DC converter performs control (so-called maximum power point tracking control) such that maximum power can be acquired from the solar cell 200, for example.

  Solar cell 200 is an example of a “DC power source” according to the first embodiment (and all the embodiments described later). The DC power source is not particularly limited to the solar cell 200 as long as it is a power source that supplies DC power. The DC power source according to the first embodiment is not particularly limited as long as it generates DC power, such as a fuel cell, a wind power generator, a storage battery, an electric vehicle, and a plasma power generator. The DC power source may be a combination of these.

<Configuration of power conditioner 100>
FIG. 2 is a schematic diagram showing a configuration of power conditioner 100 according to the first embodiment.

  Referring to FIG. 2, power conditioner 100 includes power line 3, control unit 10, power conversion unit 20, reactors 31 to 33, current measurement units 41 and 42, voltage measurement units 51 and 52, and DC bus 150.

  The DC bus 150 is a power line for transmitting DC power supplied from the solar battery 200 to the power conversion unit 20. DC bus 150 includes a positive bus PL and a negative bus SL, which are power line pairs.

  The power conversion unit 20 converts the DC power supplied from the solar cell 200 through the DC bus 150 into AC power in accordance with the switching control signals S1 to S6 from the control unit 10, and the AC obtained by the conversion Electric power is output to the power line 3. Power conversion unit 20 includes transistors Q1 to Q6, which are switching elements, and diodes D1 to D6. Transistors Q1 and Q2 are connected in series between positive bus PL and negative bus SL forming DC bus 150. An intermediate point between transistor Q1 and transistor Q2 is connected to neutral line N which is an N-phase line. Reactor 32 is provided on neutral line N.

  Transistors Q3 and Q4 are connected in series between positive bus PL and negative bus SL. An intermediate point between the transistors Q3 and Q4 is connected to a voltage line L1 that is an L1 phase line. Reactor 31 is provided on voltage line L1.

  Transistors Q5 and Q6 are connected in series between positive bus PL and negative bus SL. An intermediate point between the transistors Q5 and Q6 is connected to a voltage line L2 which is an L2 phase line. Reactor 33 is provided on voltage line L2.

As the transistors Q1 to Q6, for example, an IGBT (Insulated Gate Bipolar)
Transistor) can be used. Alternatively, a power switching element such as a power MOSFET (Metal Oxide Semiconductor Field-Effect Transistor) may be used.

  Transistors Q1-Q6 are turned on / off in response to switching control signals S1-S6 from control unit 10, respectively. By turning on / off the transistors Q1 to Q6 at a predetermined timing, the DC power supplied from the solar cell 200 can be converted into single-phase AC power.

  The current measurement unit 41 is provided on the voltage line L1, measures the current value Iac1 of the AC power output from the power conversion unit 20 to the L1 phase (that is, the current value flowing through the voltage line L1), and the measurement result is Output to the control unit 10. The current measuring unit 42 is provided on the voltage line L2, measures the current value Iac2 of AC power output from the power conversion unit 20 to the L2 phase (that is, the current value flowing through the voltage line L2), and the measurement result is Output to the control unit 10.

  The voltage measurement unit 51 is connected between the voltage line L1 and the neutral line N, and the voltage value Vac1 of the AC power output from the power conversion unit 20 to the L1 phase (that is, between the voltage line L1 and the neutral line N). And the measurement result is output to the control unit 10. The voltage measurement unit 52 is connected between the voltage line L2 and the neutral line N, and the voltage value Vac2 of the AC power output from the power conversion unit 20 to the L2 phase (that is, between the voltage line L2 and the neutral line N). And the measurement result is output to the control unit 10.

  The control part 10 controls the electric power supplied from the power conditioner 100 to the electric equipment in a house. The control unit 10 may have a hardware configuration such as a circuit, or may include a CPU (Central Processing Unit) (not shown) and be realized by the CPU executing a program stored in the memory. Good.

  Based on current values Iac1 and Iac2 received from current measuring units 41 and 42 and voltage values Vac1 and Vac2 respectively received from voltage measuring units 51 and 52, control unit 10 performs transistors according to a control method described later. Switching control signals S1 to S6 for controlling on / off of Q1 to Q6 are generated, and the power conversion unit 20 is controlled.

<Configuration of Control Unit 10A>
FIG. 3 is a schematic diagram showing a configuration of control unit 10A according to the first embodiment. Referring to FIG. 3, control unit 10A includes a power calculation unit 11A and an instruction unit 13A. The control unit 10A corresponds to the control unit 10 shown in FIG. 2, but for the sake of distinction from the other embodiments, an additional code such as “A” is attached for convenience. The same applies to the second to fourth embodiments.

  The power calculation unit 11A performs the L1 phase and the L2 phase (L1) from the power conversion unit 20 based on each current value measured by the current measurement units 41 and 42 and each voltage value measured by the voltage measurement units 51 and 52. Phase power line and L2 phase power line) is calculated.

  Specifically, the power calculation unit 11A calculates the power value P1 of the L1 phase power line based on the current value Iac1 measured by the current measurement unit 41 and the voltage value Vac1 measured by the voltage measurement unit 51. The power calculation unit 11A calculates the power value P2 of the L2-phase power line based on the current value Iac2 measured by the current measurement unit 42 and the voltage value Vac2 measured by the voltage measurement unit 52. The power calculation unit 11A calculates a total power value P that is a total value of the power value P1 and the power value P2. Then, power calculation unit 11A outputs power values P1, P2 and total power value P to instruction unit 13A.

  When the total power value P is equal to or greater than the predetermined total power set value Pw, the instruction unit 13A stops the output of the single-phase AC power to either the L1 phase power line or the L2 phase power line. The power converter 20 is instructed.

  Specifically, the instruction unit 13A compares the total power value P and the total power set value Pw, and determines whether or not the total power value P is equal to or greater than the total power set value Pw. When the total power value P is equal to or greater than the total power set value Pw, the instruction unit 13A performs power so as to stop the output of the single-phase AC power to either the L1-phase power line or the L2-phase power line. The conversion unit 20 is instructed. Note that if the instruction unit 13A determines that the power supply to one phase has already been stopped based on the power value P1 and the power value P2, the instruction unit 13A outputs the single-phase AC power output to the other phase. The power converter 20 is instructed to stop. When the total power value P is less than the total power setting value Pw, the instruction unit 13A instructs the power conversion unit 20 to execute power supply to the L1 phase and the L2 phase as usual. The total power set value Pw is set in advance by a user or the like, for example, and stored in a storage unit (not shown). In addition, the one phase and the other phase here are not particularly distinguished, but information indicating the phase in which the power supply is stopped by the instruction unit 13A (that is, to which of the L1 phase and the L2 phase is directed) Information indicating whether to stop power supply) may be stored in the storage unit in advance.

  Here, the stop instruction to the power conversion unit 20 of the instruction unit 13A will be described in more detail. The instruction unit 13A generates a switching control signal for stopping power supply to the L1 phase or the L2 phase, and outputs the generated switching control signal to the power conversion unit 20. For example, when instructing the power conversion unit 20 to stop power supply to the L1 phase, the instruction unit 13A generates switching control signals S3 and S4 that turn off the transistors Q3 and Q4, respectively. Output. In this case, the instruction unit 13A instructs the power conversion unit 20 to perform power supply to the L2 phase as usual. Specifically, the instruction unit 13A generates switching control signals S1, S2, S5, and S6 that are turned on / off at a predetermined timing for the transistors Q1, Q2, Q5, and Q6 and supplies them to the power conversion unit 20. Output.

  FIG. 4 is a diagram for explaining the influence on the electrical device when the power supply to one phase is stopped. 4 does not illustrate a part of the configuration of the power conditioner 100 for ease of explanation, it is assumed that these are configured as shown in FIG. 2 described above.

  Referring to FIG. 4, when power supply to L1 phase is stopped by an instruction to power conversion unit 20 of instruction unit 13A, electric fan 300B and vacuum cleaner 300C connected to L1 phase stop operation. . The operation of the air conditioner 300A that receives a part of the power from the L1 phase is also stopped. On the other hand, since the refrigerator 300D connected to the L2 phase can be continuously supplied with power, it does not stop.

  Referring to FIG. 3 again, instructing unit 13A generates switching control signals S5 and S6 for turning off transistors Q5 and Q6, respectively, when instructing power converter 20 to stop power supply to the L2 phase. Output to the power converter 20. In this case, the instruction unit 13A instructs the power conversion unit 20 to perform power supply to the L1 phase as usual. Specifically, the instruction unit 13A generates switching control signals S1 to S4 for turning on / off the transistors Q1 to Q4 at a predetermined timing, and outputs them to the power conversion unit 20.

  FIG. 5 is a diagram for explaining the influence on the electric device when the power supply to the other phase is stopped. Note that, in FIG. 5, a part of the configuration of the power conditioner 100 is not illustrated for ease of explanation as in FIG. 4.

  Referring to FIG. 5, when power supply to the L2 phase is stopped by an instruction to power conversion unit 20 of instruction unit 13A, refrigerator 300D connected to L2 phase stops operation. The operation of the air conditioner 300A that receives a part of the power from the L2 phase is also stopped. On the other hand, since the electric fan 300B and the vacuum cleaner 300C connected to the L1 phase can be continuously supplied with electric power, the operation is not stopped.

<Processing procedure>
FIG. 6 is a flowchart for illustrating a processing procedure of control unit 10A according to the first embodiment.

  Referring to FIG. 6, control unit 10A obtains current values Iac1 and Iac2 measured by current measuring units 41 and 42, respectively (step S2). The control unit 10A acquires the voltage values Vac1 and Vac2 measured by the voltage measuring units 51 and 52, respectively (step S4). The processes of steps S2 and S4 may be executed in parallel with each other, or may be executed in a different order.

  Control unit 10A calculates total power value P based on current values Iac1, Iac2 and voltage values Vac1, Vac2 (step S6). The control unit 10A determines whether or not the total power value P is equal to or greater than the total power set value Pw (step S8). When total power value P is less than total power set value Pw (NO in step S8), control unit 10A instructs power conversion unit 20 to operate normally (step S12), and ends the process. . If the power supply to one phase has already stopped, the power supply to the other phase is instructed to be performed normally.

  In contrast, when total power value P is equal to or greater than total power setting value Pw (YES in step S8), control unit 10A determines whether L1 phase or L2 phase is based on power value P1 and power value P2. It is determined whether power is supplied to one of the phases to be stopped (step S9). When power is supplied to the one phase (YES in step S9), control unit 10A instructs power conversion unit 20 to stop power supply to the one phase (step S10). ), The process is terminated. On the other hand, when power is not supplied to the one phase (NO in step S9), control unit 10A instructs power conversion unit 20 to stop power supply to the other phase. (Step S11), the process is terminated.

<Advantages>
According to the first embodiment, when the total power becomes equal to or greater than the total power set value, the power supply to either one of the L1 phase and the L2 phase is stopped. Therefore, it is possible to continue the power supply to the electrical device connected to the non-stopped phase while reducing the total power and avoiding excessive power supply exceeding the capacity of the power conditioner to the electrical device. .

[Embodiment 2]
In the second embodiment, a configuration in which the priority of a phase for stopping power supply can be set will be described. In addition, since <overall configuration> and <configuration of power conditioner> in Embodiment 2 are substantially the same as those in Embodiment 1, detailed description thereof will not be repeated. The same applies to the third and fourth embodiments.

<Configuration of Control Unit 10B>
FIG. 7 is a schematic diagram showing a configuration of control unit 10B according to the second embodiment. Referring to FIG. 7, control unit 10B includes a power calculation unit 11B, an instruction unit 13B, and a setting unit 15B. The power calculator 11B has substantially the same configuration as the power calculator 11A shown in FIG.

  Setting unit 15B sets the priority of each of the L1 phase power line and the L2 phase power line. Specifically, the setting unit 15B sets a priority for supplying power with priority among the L1 phase power line and the L2 phase power line. For example, the setting unit 15B sets the priority of the L1 phase power line higher than that of the L2 phase power line when receiving an instruction to give priority to the power supply to the L1 phase from the user via an operation unit (not shown).

  When the total power value P is equal to or greater than the total power set value Pw, the instruction unit 13B performs power conversion so as to stop the output of the single-phase AC power to the lower priority of the L1 phase power line and the L2 phase power line. The unit 20 is instructed. Note that if the instruction unit 13B determines that the power supply to the low priority phase has already stopped based on the power value P1 and the power value P2, the single-phase alternating current to the high priority phase is determined. The power converter 20 is instructed to stop the output of power. Specifically, when the priority of the L1 phase power line is lower than that of the L2 phase power line, the instruction unit 13B generates switching control signals S3 and S4 for turning off the transistors Q3 and Q4, respectively, to the power conversion unit 20 Output. In this case, as shown in FIG. 4, the operation of the air conditioner 300A, the electric fan 300B, and the cleaner 300C is stopped.

  On the other hand, when the priority of the L2 phase power line is lower than the L1 phase power line, the instruction unit 13B generates switching control signals S5 and S6 for turning off the transistors Q5 and Q6, respectively, to the power conversion unit 20 Output. In this case, as shown in FIG. 5, the operation of the air conditioner 300A and the refrigerator 300D is stopped.

<Processing procedure>
FIG. 8 is a flowchart for illustrating a processing procedure of control unit 10B according to the second embodiment. Since the processes of steps S22 to S28 and step S32 are the same as the processes of steps S2 to S8 and step S12 in FIG. 6, respectively, detailed description thereof will not be repeated.

  Referring to FIG. 8, when total power value P is equal to or greater than total power set value Pw (YES in step S28), control unit 10B has a higher priority for L1 phase than for L2 phase. Whether or not (step S30). When the priority of the L1 phase is higher than the priority of the L2 phase (YES in step S30), the control unit 10B determines whether power is supplied to the L2 phase based on the power value P2. Judgment is made (step S31). When power is supplied to the L2 phase (YES in step S31), the control unit 10B instructs the power conversion unit 20 to stop power supply to the L2 phase (step S34), and the process is performed. finish. On the other hand, when power is not supplied to the L2 phase (NO in step S31), the control unit 10B instructs the power conversion unit 20 to stop power supply to the L1 phase (step S31). S36), the process is terminated.

  In step S30, when the priority of the L2 phase is higher than the priority of the L1 phase (NO in step S30), the control unit 10B supplies power to the L1 phase based on the power value P1. It is determined whether or not it has been performed (step S33). When power is supplied to the L1 phase (YES in step S33), the control unit 10B instructs the power conversion unit 20 to stop power supply to the L1 phase (step S36), and performs processing. finish. In contrast, when power is not supplied to the L1 phase (NO in step S33), control unit 10B instructs power conversion unit 20 to stop power supply to L2 phase (step S33). S34), the process is terminated.

<Advantages>
According to the second embodiment, when the total power becomes equal to or greater than the total power set value, first, the power supply with the lower priority of the L1 phase and the L2 phase is stopped. Therefore, if you connect an important electrical device that you do not want to stop to the higher-priority phase, even if the total power exceeds the total power setting value, the higher-priority phase will not stop. Will continue to supply power to the important electrical equipment.

  In addition, the user can select a phase in which priority is given to power supply by appropriately setting the priority.

[Embodiment 3]
As a third embodiment, a configuration will be described in which the phase for stopping power supply is determined in consideration of the power value P1 of the L1 phase power line and the power value P2 of the L2 phase power line.

<Configuration of Control Unit 10C>
FIG. 9 is a schematic diagram showing a configuration of a control unit 10C according to the third embodiment. Referring to FIG. 9, control unit 10C includes a power calculation unit 11C and an instruction unit 13C. The power calculator 11C has substantially the same configuration as the power calculator 11A shown in FIG. The power calculator 11C outputs the power values P1, P2 and the total power value P to the instruction unit 13C.

  When at least one of the power value P1 of the L1 phase power line and the power value P2 of the L2 phase power line is greater than or equal to the total power set value Pw, the instructing unit 13C is a power line corresponding to the power value that is greater than or equal to the total power set value Pw The power conversion unit 20 is instructed to stop the output of the single-phase AC power. In addition, the instruction unit 13C determines that the power value P1 and the power value when the total power value P is equal to or greater than the total power set value Pw and the power value P1 and the power value P2 are less than the total power set value Pw. The power conversion unit 20 is instructed to stop the output of the single-phase AC power to the power line corresponding to the smaller power value of P2. Hereinafter, the reason why the instruction unit 13C performs the stop instruction in this way will be specifically described.

  FIG. 10 is a diagram illustrating an example of a relationship between each power value before and after the total power becomes equal to or greater than the total power setting value and a phase in which power supply is stopped. Referring to FIG. 10, time T1 is a time before the total power set value Pw or more, and time T2 is a time after the total power set value Pw or more. Here, the total power setting value Pw is set based on the power supply capability of the power conditioner, for example, and is assumed to be 5 kW. At time T1, among the power values P1 and P2 of the L1 phase and the L2 phase, the power value of the phase with the larger power value is Pb, and the power value of the phase with the smaller power value is Ps. .

  Pattern A shows a pattern in which the power value Pb at time T1 increases and the power value Pb at time T2 becomes equal to or greater than the total power setting value Pw. In this case, the power value Pb (5.5 kW) at time T2 is obtained by adding the increased power (3 kW) to the power value Pb (2.5 kW) at time T1. Since the power value Pb (5.5 kw) at the time T2 is equal to or greater than the total power setting value (5 kw), the power supply is excessive even in the phase corresponding to the power value Pb. Therefore, in the case of pattern A, power supply to the phase corresponding to the power value Pb is stopped.

  Pattern B shows a pattern in which the power value Pb at time T1 increases and the power value Pb at time T2 is less than the total power setting value Pw. In this case, the power value Pb (4.5 kW) at time T2 is obtained by adding the increased power (2 kW) to the power value Pb (2.5 kW) at time T1. In the case of pattern B, the power value Pb (4.5 kw) at time T2 is less than the total power setting value (5 kw), and therefore corresponds to a power value Ps (2.0 kw) that is smaller than the power value Pb. The power supply to the phase to be stopped is stopped. As a result, as much power as possible can be supplied to the electrical device.

  Pattern C shows a pattern in which the power value Ps at time T1 increases and the power value Ps at time T2 becomes equal to or greater than the total power setting value Pw. In this case, the power value Ps (5.5 kW) at time T2 is obtained by adding the increased power (3.5 kW) to the power value Ps (2.0 kW) at time T1. In the case of pattern C, the power value Ps (5.5 kw) at time T2 is equal to or greater than the total power setting value (5 kw), and thus power supply to the phase corresponding to the power value Ps is stopped.

  Pattern D shows a pattern in which the power value Ps at time T1 increases and the power value Ps at time T2 is less than the total power set value Pw and greater than or equal to the power value Pb. In this case, the power value Ps (4.5 kW) at time T2 is obtained by adding the increased power (2.5 kW) to the power value Ps (2.0 kW) at time T1. At time T2, the power value Ps (4.5 kW) is less than the total power set value (5 kW) and larger than the power value Pb (2.5 kW). Therefore, in the case of the pattern D, the power supply to the phase corresponding to the power value Pb is stopped. As a result, as much power as possible can be supplied to the electrical device.

  Pattern E shows a pattern in which the power value Ps at time T1 increases and the power value Ps at time T2 is less than the total power setting value Pw and less than the power value Pb. In this case, the power value Ps (2.5 kW) at time T2 is obtained by adding the increased power (1 kW) to the power value Ps (1.5 kW) at time T1. At time T2, the power value Ps (2.5 kW) is less than the total power set value (5 kW) and less than the power value Pb (3.0 kW). Therefore, in the case of the pattern E, the power supply to the phase corresponding to the power value Ps is stopped. As a result, as much power as possible can be supplied to the electrical device.

  In summary, when at least one of the power values Pb and Ps is greater than or equal to the total power set value Pw at time T2, power supply to the phase corresponding to the power value that is greater than or equal to the total power set value Pw is stopped. (Corresponding to patterns A and C). When both power values Pb and Ps are greater than or equal to the total power set value Pw, power supply to both phases is stopped. Further, at time T2, when the total power value P is equal to or greater than the total power set value Pw and the power value Pb and the power value Ps are less than the total power set value Pw, the power value Pb and the power value Ps Power supply to the phase corresponding to the smaller power value is stopped (corresponding to patterns B, D, and E).

  Here, for ease of explanation, one of the power values Pb and Ps increases and the other does not change, but the power values Pb and Ps constantly vary. Even when the power values Pb and Ps both change (increase / decrease), the method for determining the phase for stopping the power supply is the same.

<Processing procedure>
FIG. 11 is a flowchart for illustrating a processing procedure of control unit 10C according to the third embodiment. Since the processes of steps S42 to S48 and step S52 are the same as the processes of steps S2 to S8 and step S12 in FIG. 6, detailed description thereof will not be repeated.

  Referring to FIG. 11, when total power value P is equal to or greater than total power set value Pw (YES in step S48), control unit 10C determines that at least one of power value P1 and power value P2 is the total power set value. It is determined whether or not it is greater than or equal to Pw (step S50). When at least one of power value P1 and power value P2 is greater than or equal to total power set value Pw (YES in step S50), control unit 10C determines that the phase corresponding to the power value that is greater than or equal to total power set value Pw. The power conversion unit 20 is instructed to stop the power supply (step S54), and the process ends. Specifically, when only the power value P1 is greater than or equal to the total power setting value Pw, the control unit 10C instructs the power conversion unit 20 to stop power supply to the L1 phase, and only the power value P2 When the total power set value Pw is equal to or greater than, the power conversion unit 20 is instructed to stop the power supply to the L2 phase, and when both the power value P1 and the power value P2 are equal to or greater than the total power set value Pw The power converter 20 is instructed to stop the power supply to the L1 phase and the L2 phase.

  On the other hand, when both power value P1 and power value P2 are less than total power setting value Pw (NO in step S50), control unit 10C determines whether power value P1 is smaller than power value P2. Is determined (step S58). When power value P1 is smaller than power value P2 (YES in step S58), control unit 10C instructs power conversion unit 20 to stop power supply to the L1 phase (step S60) and performs processing. Exit. On the other hand, when power value P1 is not smaller than power value P2 (NO in step S58), control unit 10C instructs power conversion unit 20 to stop power supply to the L2 phase. (Step S62), the process ends.

  In step S58, when the power value P1 is the same as the power value P2, the control unit 10C may instruct the power conversion unit 20 to stop the power supply to the predetermined phase. .

<Advantages>
According to the third embodiment, when the total power becomes equal to or greater than the total power set value, the phase for stopping power supply is determined in consideration of the power value of each phase. Therefore, it is possible to prevent the total power from becoming excessive with higher accuracy and to increase the power supplied to the electric device as much as possible.

[Embodiment 4]
In Embodiment 4, in addition to the total power setting value Pw, when the single-phase power setting value Pe that is the reference threshold value for one phase is set, the power value P1 of the L1 phase power line and the power of the L2 phase power line A configuration for determining a phase for stopping power supply in consideration of the value P2 will be described.

<Configuration of Control Unit 10D>
FIG. 12 is a schematic diagram showing a configuration of a control unit 10D according to the fourth embodiment. Referring to FIG. 12, control unit 10D includes a power calculation unit 11D and an instruction unit 13D. The power calculation unit 11D has substantially the same configuration as the power calculation unit 11A illustrated in FIG. The power calculation unit 11D outputs the power values P1, P2 and the total power value P to the instruction unit 13D.

  When at least one of the power value P1 and the power value P2 is greater than or equal to the single-phase power set value Pe, the instructing unit 13D performs single-phase AC to the power line corresponding to the power value that is greater than or equal to the single-phase power set value Pe. The power converter 20 is instructed to stop the output of power. The single-phase power set value Pe is a value smaller than the total power set value Pw. This single-phase power set value Pe is set in advance by a user, for example, and stored in a storage unit (not shown).

  In addition, the instruction unit 13D determines that when the power value P1 and the power value P2 are less than the single-phase power set value Pe and the total power value P is equal to or greater than the total power set value Pw, the power value P1 and the power The power conversion unit 20 is instructed to stop the output of the single-phase AC power to the power line corresponding to the smaller power value among the values P2. Hereinafter, the reason why the instruction unit 13D performs the stop instruction in this way will be specifically described.

  FIG. 13 is a diagram illustrating another example of the relationship between each power value and the phase in which power supply is stopped before and after the total power becomes equal to or greater than the total power setting value. Referring to FIG. 13, time T1 is the time before the total power set value Pw or more, and time T2 is the time after the total power set value Pw or more. Here, the total power set value Pw is set to, for example, 5 kw based on the power supply capability of the power conditioner, and the single-phase power set value Pe is, for example, an extension regulation for a commercial system (single-phase three-wire output An allowable unbalance rate of 40%) is set to 3.5 kW.

  Pattern A1 shows a pattern in which the power value Pb at time T1 increases and the power value Pb at time T2 becomes equal to or greater than the single-phase power set value Pe. In this case, the power value Pb (4.0 kW) at time T2 is obtained by adding the increased power (1.5 kW) to the power value Pb (2.5 kW) at time T1. Since the power value Pb (4.0 kW) at time T2 is equal to or greater than the single-phase power set value Pe (3.5 kW), the power supply is single-phase and excessive. Therefore, in the case of pattern A1, the power supply to the phase corresponding to the power value Pb is stopped.

  Pattern B1 shows a pattern in which the power value Pb at time T1 increases and the power value Pb at time T2 is less than the single-phase power set value Pe. In this case, the power value Pb (3.2 kW) at time T2 is obtained by adding the increased power (0.7 kW) to the power value Pb (2.5 kW) at time T1. In the case of the pattern B1, the power value Pb (3.2 kW) at the time T2 is less than the single-phase power setting value (3.5 kW), and thus the power value Ps (2.0 kW) smaller than the power value Pb. The power supply to the phase corresponding to) is stopped. As a result, as much power as possible can be supplied to the electrical device.

  Pattern C1 shows a pattern in which the power value Ps at time T1 increases and the power value Ps at time T2 becomes equal to or greater than the single-phase power set value Pe. In this case, the power value Ps (4.0 kW) at time T2 is obtained by adding the increased power (2.0 kW) to the power value Ps (2.0 kW) at time T1. In the case of the pattern C1, the power value Ps (4.0 kW) at the time T2 is equal to or greater than the single-phase power setting value (3.5 kW), and thus power supply to the phase corresponding to the power value Ps is stopped. The

  The pattern D1 shows a pattern in which the power value Ps at time T1 increases and the power value Ps at time T2 is less than the single-phase power set value Pe and greater than or equal to the power value Pb. In this case, the power value Ps (3.2 kW) at time T2 is obtained by adding the increased power (1.2 kW) to the power value Ps (2.0 kW) at time T1. At time T2, power value Ps (3.2 kW) is less than single-phase power set value (3.5 kW) and greater than power value Pb (2.5 kW). Therefore, in the case of the pattern D1, the power supply to the phase corresponding to the power value Pb is stopped. As a result, as much power as possible can be supplied to the electrical device.

  Pattern E1 shows a pattern in which power value Ps at time T1 increases and power value Ps at time T2 is less than single-phase power set value Pe and less than power value Pb. In this case, the power value Ps (2.5 kW) at time T2 is obtained by adding the increased power (1 kW) to the power value Ps (1.5 kW) at time T1. At time T2, power value Ps (2.5 kW) is less than the single-phase power set value (3.5 kW) and less than power value Pb (3.0 kW). Therefore, in the case of the pattern E1, the power supply to the phase corresponding to the power value Ps is stopped. As a result, as much power as possible can be supplied to the electrical device.

  In summary, when at least one of the power values Pb and Ps is greater than or equal to the single-phase power set value Pe at time T2, the power to the phase corresponding to the power value greater than or equal to the single-phase power set value Pe Supply is stopped (corresponding to patterns A1 and C1). When both power values Pb and Ps are greater than or equal to the single-phase power set value Pe, power supply to both phases is stopped. Further, at time T2, when the total power value P is equal to or greater than the total power set value Pw and the power value Pb and the power value Ps are less than the single-phase power set value Pe, the power value Pb and the power value Power supply to the phase corresponding to the smaller power value of Ps is stopped (corresponding to patterns B1, D1, and E1).

  Here, for ease of explanation, one of the power values Pb and Ps increases and the other does not change, but the power values Pb and Ps constantly vary. Even when the power values Pb and Ps both change (increase / decrease), the method for determining the phase for stopping the power supply is the same. Moreover, although the case where the total power value P is equal to or greater than the total power set value Pw has been described, in the fourth embodiment, even if the total power value P is less than the total power set value Pw, the power value Pb and If at least one of the power values Ps is greater than or equal to the single-phase power set value Pe, power supply to the phase corresponding to the power value that is greater than or equal to the single-phase power set value Pe is stopped.

<Processing procedure>
FIG. 14 is a flowchart for illustrating a processing procedure of control unit 10C according to the fourth embodiment. In addition, since the process of step S72-S76 is the same as the process of step S2-S6 in FIG. 6, respectively, the detailed description is not repeated.

  Referring to FIG. 14, control unit 10D determines whether at least one of power value P1 and power value P2 is equal to or greater than single-phase power set value Pe (step S78). When at least one of power value P1 and power value P2 is greater than or equal to single-phase power set value Pe (YES in step S78), control unit 10D causes a phase corresponding to a power value that is greater than or equal to single-phase power set value Pe. The power conversion unit 20 is instructed to stop the power supply to (step S84), and the process is terminated. Specifically, when only the power value P1 is equal to or greater than the single-phase power set value Pe, the control unit 10D instructs the power conversion unit 20 to stop power supply to the L1 phase, and only the power value P2 Is greater than the single-phase power set value Pe, the power conversion unit 20 is instructed to stop the power supply to the L2 phase, and both the power value P1 and the power value P2 are greater than or equal to the single-phase power set value Pe. In this case, the power conversion unit 20 is instructed to stop the power supply to the L1 phase and the L2 phase.

  On the other hand, when both power value P1 and power value P2 are less than single-phase power set value Pe (NO in step S78), control unit 10D determines that total power value P is greater than or equal to total power set value Pw. Is determined (step S80). When total power value P is less than total power set value Pw (NO in step S80), control unit 10D instructs power conversion unit 20 to operate normally (step S82), and ends the process. . If the power supply to one phase has already stopped, the power supply to the other phase is instructed to be performed normally. In contrast, when total power value P is equal to or greater than total power setting value Pw (YES in step S80), control unit 10D determines whether power value P1 is smaller than power value P2 (step S80). S88).

  When power value P1 is smaller than power value P2 (YES in step S88), control unit 10D instructs power conversion unit 20 to stop power supply to the L1 phase (step S90) and performs processing. Exit. On the other hand, if power value P1 is not smaller than power value P2 (NO in step S88), control unit 10D instructs power conversion unit 20 to stop power supply to the L2 phase. (Step S92), the process ends.

  Here, the process of calculating the total power value P (step S76) is performed before step S78, but this process is not the above-described stage, and both the power value P1 and the power value P2 are the single-phase power set values. It may be performed before step S80 only when it is less than Pe (NO in step S78).

  In step S88, when the power value P1 is the same as the power value P2, the control unit 10D may instruct the power conversion unit 20 to stop the power supply to a predetermined phase. .

<Advantages>
According to the fourth embodiment, when the power supply to the L1 phase or the L2 phase is equal to or higher than the single phase power set value, or when the total power is equal to or higher than the total power set value, the power value of each phase is set. In consideration, the phase for stopping the power supply is determined. For this reason, it is possible to prevent the supply power in one phase from becoming excessive and to increase the power supplied to the electrical equipment as much as possible.

[Embodiment 5]
Embodiment 5 demonstrates the structure which interrupts | blocks the circuit breaker in the phase side by which electric power supply is stopped.

<Configuration of power conditioner 100E>
FIG. 15 is a schematic diagram showing a configuration of a power conditioner 100E according to the fifth embodiment. Referring to FIG. 15, a power conditioner 100E includes a power line 3, a control unit 10E, a power conversion unit 20, reactors 31 to 33, current measurement units 41 and 42, voltage measurement units 51 and 52, Circuit breakers 80 and 82 and a DC bus 150 are included. The configurations of the power line 3, the power conversion unit 20, the reactors 31 to 33, the current measurement units 41 and 42, the voltage measurement units 51 and 52, and the DC bus 150 are the same as those configurations in the power conditioner 100. Detailed description will not be repeated.

  The circuit breaker 80 is inserted and connected to the voltage line L1 between the power conversion unit 20 and the electric device. For example, circuit breaker 80 is connected between an intermediate point between transistors Q3 and Q4 and reactor 31. The circuit breaker 82 is inserted and connected to the voltage line L2 between the power conversion unit 20 and the electric device. For example, circuit breaker 82 is connected between an intermediate point between transistors Q5 and Q6 and reactor 33.

  Control unit 10E generates switching control signals S1 to S6 for controlling on / off of transistors Q1 to Q6 based on currents Iac1 and Iac2 and voltages Vac1 and Vac2, and controls power conversion unit 20 . The control is the same as that of the control unit according to the above-described embodiment. The control unit 10E further generates control signals C1 and C2 for operating the circuit breakers 80 and 82 in accordance with a control method described later, and controls the circuit breakers 80 and 82 using the control signals C1 and C2. .

<Configuration of Control Unit 10E>
FIG. 16 is a schematic diagram showing a configuration of control unit 10E according to the fifth embodiment. Referring to FIG. 16, control unit 10E includes a power calculation unit 11E, an instruction unit 13E, and a cutoff control unit 17E. The power calculator 11E has substantially the same configuration as the power calculator 11A shown in FIG. In addition, instructing unit 13E has substantially the same configuration as instructing unit 13A according to Embodiment 1 described above, for example. In addition, instructing unit 13E notifies cutoff control unit 17E whether the power conversion unit 20 has been instructed to stop power supply to the L1 phase or the L2 phase.

  When the instruction unit 13E instructs the power conversion unit 20 to stop the output of the single-phase AC power to the L1 phase power line, the interruption control unit 17E causes the circuit breaker 80 to perform an interruption operation. Specifically, the break control unit 17E generates a control signal C1 for causing the breaker 80 to perform a break operation, and outputs the control signal C1 to the breaker 80.

  Moreover, the interruption | blocking control part 17E carries out interruption | blocking operation | movement of the circuit breaker 82, when the instruction | indication part 13E instruct | indicates the power converter part 20 to stop the output of the single phase alternating current power to an L2 phase power line. Specifically, the break control unit 17E generates a control signal C2 for causing the breaker 82 to perform a break operation, and outputs the control signal C2 to the breaker 82.

  In addition, the configuration of instruction unit 13E may be substantially the same as any of instruction units 13B to 13D according to Embodiments 2 to 4 described above. Specifically, when the power conversion unit 20 is instructed to stop the power supply to the L1 phase by the instruction unit 13E having the same configuration as any of the instruction units 13B to 13D, the cutoff control unit 17E The circuit breaker 80 is caused to perform a breaking operation. When the power conversion unit 20 is instructed by the instruction unit 13E to stop the power supply to the L2 phase, the cutoff control unit 17E causes the circuit breaker 82 to perform a cutoff operation. However, when the configuration of the instruction unit 13E is the same as the configuration of the instruction unit 13B, the control unit 10E further includes a setting unit having the same configuration as the configuration of the setting unit 15B.

<Processing procedure>
FIG. 17 is a flowchart for illustrating a processing procedure of control unit 10E according to the fifth embodiment. Here, instructing unit 13E has, for example, substantially the same configuration as instructing unit 13A according to the first embodiment. Since the processes in steps S102 to S112 are the same as the processes in steps S2 to S12 in FIG. 6, detailed description thereof will not be repeated.

  In step S110, when the control unit 10E instructs the power conversion unit 20 to stop power supply to one phase, the control unit 10E causes the circuit breaker corresponding to the one phase to perform a cutoff operation (step S113). In step S111, when the control unit 10E instructs the power conversion unit 20 to stop the power supply to the other phase, the control unit 10E causes the circuit breaker corresponding to the other phase to perform a blocking operation (step S114). ). Specifically, when the control unit 10E instructs the power conversion unit 20 to stop the power supply to the L1 phase, the control unit 10E causes the circuit breaker 80 to perform a cutoff operation, and stops the power supply to the L2 phase. When the power converter 20 is instructed, the circuit breaker 82 is caused to perform a breaking operation. When the control unit 10E instructs the power conversion unit 20 to stop the power supply to both phases, the control unit 10E causes the circuit breakers 80 and 82 to perform a blocking operation.

  In the above description, the processing procedure of the control unit 10E is obtained by adding the blocking operation process to the process described in the first embodiment. However, when the configuration of the instruction unit 13E is the configuration of the instruction units 13B to 13D according to the second to fourth embodiments, the processing of the control unit 10E adds a blocking operation process to the processing described in the second to fourth embodiments. You may do.

<Advantages>
According to the fifth embodiment, the circuit breaker corresponding to the phase in which power supply is stopped is caused to perform a breaking operation. Therefore, when excessive power exceeding the capacity of the power conditioner is supplied to the electrical equipment, even if the switching element provided in the power converter breaks down and becomes always conductive, the DC power is supplied to the power line. Can be prevented from continuing to be output, so that it is possible to prevent a failure of the electrical device.

[Summary]
Embodiments of the present invention can be summarized as follows.

  (1) It is the power conditioner 100 connected to the solar cell 200, and includes a power conversion unit 20 that converts DC power output from the solar cell 200 into single-phase AC power, a voltage line L 1, and a neutral line N. A power line 3 that includes the L1 phase power line that is configured and the L2 phase power line that is configured by the voltage line L2 and the neutral line N, and that supplies the single-phase AC power output from the power conversion unit 20; Current measurement units 41 and 42 that measure the current value and the current value of the voltage line L2, the voltage value between the voltage line L1 and the neutral line N, and the voltage value between the voltage line L2 and the neutral line N And voltage control units 51 and 52 that measure the power and a control unit 10 that controls the power conversion unit 20. The control unit 10 determines the power value of the L1 phase power line and the power value of the L2 phase power line based on the current values measured by the current measuring units 41 and 42 and the voltage values measured by the voltage measuring units 51 and 52. When the total power value P is greater than or equal to a predetermined total power set value Pw, to the L1 phase power line or the L2 phase power line And an instruction unit 13 that instructs the power conversion unit 20 to stop the output of the single-phase AC power.

  According to the above configuration, when the total power becomes equal to or greater than the total power set value, the power supply to either the L1 phase or the L2 phase is stopped, and the total power is reduced to reduce the power condition to the electrical equipment. It is possible to continue supplying power to the electrical equipment connected to the non-stopped phase while avoiding excessive power supply exceeding the capacity of the controller.

  (2) The control unit 10B further includes a setting unit 15B that sets the priority of each of the L1 phase power line and the L2 phase power line, and the instruction unit 13B indicates that the total power value P is greater than or equal to the total power set value Pw. The power conversion unit 20 is instructed to stop the output of the single-phase AC power to the lower priority of the L1 phase power line and the L2 phase power line.

  According to the above configuration, if important electrical equipment is connected to the higher-priority phase, even if the total power exceeds the total power setting value, the higher-priority phase will not stop. Will continue to supply power to the important electrical equipment.

  (3) When at least one of the power value of the L1 phase power line and the power value of the L2 phase power line is equal to or greater than the total power set value Pw, the instruction unit 13C corresponds to the power value that is equal to or greater than the total power set value Pw. The power converter 20 is instructed to stop the output of the single-phase AC power to the power line.

  According to the above configuration, when the power supply to the L1 phase or the L2 phase becomes equal to or higher than the total power set value, the power supply to the phase that outputs power equal to or higher than the total power set value is stopped. Therefore, it is possible to more accurately prevent the total power from becoming excessive.

  (4) When the total power value P is equal to or greater than the total power set value Pw, the instructing unit 13C is when the power value of the L1 phase power line and the power value of the L2 phase power line are less than the total power set value Pw The power converter 20 is instructed to stop the output of the single-phase AC power to the power line corresponding to the smaller one of the power value of the L1 phase power line and the power value of the L2 phase power line.

  According to the said structure, the electric power supply to the phase with a smaller electric power supply among L1 phase and L2 phase is stopped. Therefore, the power supplied as a whole can be increased as much as possible, and the number of electrical devices that are stopped can be reduced.

  (5) The instruction unit 13D further determines the single-phase power when at least one of the power value of the L1 phase power line and the power value of the L2 phase power line is equal to or larger than the single phase power set value Pe smaller than the total power set value Pw. The power converter 20 is instructed to stop the output of the single-phase AC power to the power line corresponding to the power value that is equal to or greater than the set value Pe.

  According to the above configuration, when the power supply to the L1 phase or the L2 phase becomes equal to or higher than the single-phase power set value, the power supply to the phase that outputs power equal to or higher than the single-phase power set value is stopped. The Therefore, it is possible to prevent the supply power in one phase from becoming excessive.

  (6) The instruction unit 13D is a case where the power value of the L1 phase power line and the power value of the L2 phase power line are less than the single phase power set value Pe, and the total power value P is greater than or equal to the total power set value Pw The power conversion unit 20 is instructed to stop the output of the single-phase AC power to the power line corresponding to the smaller one of the power value of the L1 phase power line and the power value of the L2 phase power line.

  According to the said structure, the electric power supply to the phase with a smaller electric power supply among L1 phase and L2 phase is stopped. Therefore, the power supplied as a whole can be increased as much as possible, and the number of electrical devices that are stopped can be reduced.

  (7) The power conditioner 100E is provided on the circuit breaker 80 provided on the voltage line L1 between the power conversion unit 20 and the electric device, and on the voltage line L2 between the power conversion unit 20 and the electric device. And a circuit breaker 82. The control unit 10E further includes a cutoff control unit 17E that controls the circuit breakers 80 and 82. When the instruction unit 13E instructs the power conversion unit 20 to stop the output of the single-phase AC power to the L1 phase power line, the interruption control unit 17E causes the circuit breaker 80 to perform an interruption operation, and the instruction unit 13E When the power converter 20 is instructed to stop the output of the single-phase AC power to the power line, the circuit breaker 82 is cut off.

  According to the above configuration, even when the switching element provided in the power conversion unit fails and is always in a conductive state, it is possible to prevent a failure of the electrical device due to the supply of DC power.

  (8) A method for controlling the power conditioner 100 connected to the solar cell 200, which includes a step of converting DC power output from the solar cell 200 into single-phase AC power, the power conditioner 100 being a voltage line The power line 3 includes an L1 phase power line composed of L1 and a neutral line N and an L2 phase power line composed of a voltage line L2 and a neutral line N, and supplies converted single-phase AC power. The control method includes a step of measuring a current value of the voltage line L1 and a current value of the voltage line L2, a voltage value between the voltage line L1 and the neutral line N, and between the voltage line L2 and the neutral line N. A total power value P obtained by adding the power value of the L1 phase power line and the power value of the L2 phase power line based on the measured current value and each measured voltage value. A step of calculating, and a step of stopping output of single-phase AC power to either one of the L1 phase power line and the L2 phase power line when the total power value P is equal to or greater than a predetermined total power set value Pw; Further included.

  According to the above configuration, when the total power becomes equal to or greater than the total power set value, the power supply to either the L1 phase or the L2 phase is stopped, and the total power is reduced to reduce the power condition to the electrical equipment. It is possible to continue supplying power to the electrical equipment connected to the non-stopped phase while avoiding excessive power supply exceeding the capacity of the controller.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  3 power lines 10, 10A, 10B, 10C, 10D, 10E control unit, 11A, 11B, 11C, 11D, 11E power calculation unit, 13A, 13B, 13C, 13D, 13E instruction unit, 15B setting unit, 17E cutoff control unit , 20 Power conversion unit, 31, 32, 33 reactor, 41, 42 Current measurement unit, 51, 52 Voltage measurement unit, 80, 82 Circuit breaker, 100, 100E Power conditioner, 150 DC bus, 200 Solar cell, 300A Air conditioner , 300B electric fan, 300C vacuum cleaner, 300D refrigerator, 400 distribution board, 800 pole transformer, 900 power system.

Claims (5)

A power conditioner connected to a DC power source,
A power converter that converts DC power output from the DC power source into single-phase AC power;
A first power line composed of a first voltage line and a neutral line, and a second power line composed of a second voltage line and the neutral line, and output from the power converter. A power supply line for supplying phase AC power;
A current measurement unit that measures a current value of the first voltage line and a current value of the second voltage line;
A voltage measuring unit that measures a voltage value between the first voltage line and the neutral line and a voltage value between the second voltage line and the neutral line;
A control unit for controlling the power conversion unit,
The controller is
Based on each current value measured by the current measurement unit and each voltage value measured by the voltage measurement unit, a total sum of the power value of the first power line and the power value of the second power line is added. A power calculation unit for calculating a power value;
When the total power value is equal to or greater than a predetermined first threshold value, the power is set so as to stop the output of the single-phase AC power to at least one of the first power line and the second power line. A power conditioner including an instruction unit for instructing the conversion unit. The controller is
A setting unit configured to set the priority of each of the first and second power lines;
The instruction unit stops the output of the single-phase AC power to the lower one of the first and second power lines when the total power value is equal to or greater than the first threshold. The power conditioner according to claim 1, wherein the power converter is instructed to the power converter. The instruction unit corresponds to the power value that is equal to or greater than the first threshold when at least one of the power value of the first power line and the power value of the second power line is equal to or greater than the first threshold. Instructing the power converter to stop the output of the single-phase AC power to the power line to
When the total power value is greater than or equal to the first threshold, and when the power value of the first power line and the power value of the second power line are less than the first threshold, the first The power conversion unit is instructed to stop the output of the single-phase AC power to the power line corresponding to the smaller one of the power value of the power line and the power value of the second power line. The power conditioner described in 1. The instruction unit further includes the second power when at least one of a power value of the first power line and a power value of the second power line is equal to or greater than a second threshold value that is smaller than the first threshold value. Instructing the power converter to stop the output of the single-phase AC power to the power line corresponding to the power value that is equal to or greater than a threshold
When the power value of the first power line and the power value of the second power line are less than the second threshold and the total power value is equal to or greater than the first threshold, the first The power conversion unit is instructed to stop the output of the single-phase AC power to the power line corresponding to the smaller one of the power value of the power line and the power value of the second power line. The power conditioner described in 1. A first circuit breaker provided on the first voltage line between the power conversion unit and the load unit; and a second circuit line provided between the power conversion unit and the load unit. A second circuit breaker,
The controller is
A break controller for controlling the first and second breakers;
The interruption control unit causes the first circuit breaker to perform an interruption operation when the instruction unit instructs the power conversion unit to stop the output of the single-phase AC power to the first power line, 5. When the instruction unit instructs the power conversion unit to stop the output of the single-phase AC power to the second power line, the second circuit breaker is operated to be cut off. The power conditioner of any one of Claims.

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