JP2016144314A - Controller, power conversion device, power supply system, and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more effectively suppress power output from a power conversion unit interconnecting with a power supply, when power suppression is necessary.SOLUTION: A controller for controlling power output from a power conversion unit interconnecting with a power supply comprises: a power value acquisition unit for acquiring a power value indicating the magnitude of the power output from the power conversion unit; and a power control unit for executing power suppression control of suppressing the power output from the power conversion unit on the basis of at least one power value, of a plurality of power values acquired by the power value acquisition unit, in a reference period determined on the basis of timing at which the power output from the power conversion unit should be suppressed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a control device, a power conversion device, a power supply system, and a control method.

A power generation system including thermal power generation and nuclear power generation generates power based on a power generation plan based on power demand prediction.
Patent Document 1 JP 2013-172537 A

  When a distributed power source such as a solar cell is connected to such a power generation system via a power conversion device such as a power conditioner, it is necessary to suppress the power based on a power generation plan. It is desirable for the converter to effectively suppress power from the distributed power source.

  A control device according to one aspect of the present invention is a control device that controls power output from a power conversion unit that is linked to a power supply, and obtains a power value that indicates the magnitude of power output from the power conversion unit. To at least one power value within a reference period determined based on a timing at which power output from the power conversion unit should be suppressed among a plurality of power values acquired by the power value acquisition unit And a power control unit that executes power suppression control that suppresses the power output from the power conversion unit.

  The control device further includes a reference power value deriving unit that derives a reference power value based on at least one power value within a reference period among a plurality of power values acquired by the power value acquiring unit, The unit may control the power suppression control based on the reference power value.

  In the control device, the power control unit may control the power output from the power conversion unit so that the power value does not exceed the reference power value.

  The control apparatus further includes a reference power amount deriving unit that derives a reference power amount based on at least one power value within a reference period among a plurality of power values acquired by the power value acquiring unit, The unit may control the power suppression control based on the reference power amount.

  In the control device, the power control unit may control the power output from the power conversion unit so that the amount of power output from the power conversion unit does not exceed the reference power amount.

  The control device includes a reference power value deriving unit that derives a reference power value based on at least one power value within a reference period among a plurality of power values acquired by the power value acquiring unit, and a power value acquiring unit A reference power amount deriving unit for deriving a reference power amount based on at least one power value within the reference period among the plurality of power values acquired by the power control unit, wherein the power control unit includes the reference power value and the reference The power suppression control may be controlled based on the amount of power.

  The control device may further include a receiving unit that receives a command signal instructing to suppress power output from the power conversion unit, and the power control unit may specify timing based on the command signal.

  In the control device, the power control unit may specify the timing based on a power suppression schedule for suppressing the power output from the power conversion unit.

  The power converter device which concerns on 1 aspect of this invention is equipped with the said control apparatus and the power converter part which is controlled by the control apparatus and converts the direct current from a distributed power supply into alternating current.

  The power supply system which concerns on 1 aspect of this invention is provided with the said power converter device and a distributed power supply.

  The power supply system may further include a power generation management device that transmits a command signal instructing to suppress power based on a power generation plan to the power conversion device.

  A control method according to an aspect of the present invention is a control method for controlling power output from a power converter linked to a power supply, and obtains a power value indicating the magnitude of power output from the power converter. And at least one power value within a reference period that is determined based on the timing at which the power output from the power conversion unit should be suppressed among the plurality of power values acquired in the step of acquiring the power value And executing power suppression control for suppressing power output from the power converter.

  The summary of the invention does not enumerate all the features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

It is a figure showing a system configuration figure showing an example of the whole power supply system composition concerning a 1st embodiment. It is a figure which shows an example of the circuit structure of the power converter device which concerns on 1st Embodiment. An example of the functional block of the control apparatus which concerns on 1st Embodiment is shown. It is a flowchart which shows an example of the electric power suppression control which the control apparatus which concerns on 1st Embodiment performs. It is a figure which shows typically the time change of the electric power value of the electric power output from a power converter device when electric power suppression control is performed based on a reference electric power value. It is a figure which shows the functional block of the control apparatus which concerns on 2nd Embodiment. It is a figure which shows the functional block of the control apparatus which concerns on 3rd Embodiment. It is a flowchart which shows an example of the electric power suppression control which the control apparatus which concerns on 3rd Embodiment performs. It is a figure which shows typically the time change of the electric power value of the electric power output from a power converter device when electric power suppression control is performed based on reference | standard electric energy. It is a figure which shows the functional block of the control apparatus which concerns on 4th Embodiment. It is a flowchart which shows an example of the electric power suppression control which the control apparatus which concerns on 4th Embodiment performs.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is a system configuration diagram illustrating an example of the overall configuration of a power supply system 10 according to the first embodiment. The power supply system 10 includes a plurality of power conversion devices 100, a plurality of solar cell arrays 200, a system power supply 300, and a power generation management device 400.

  The power conversion apparatus 100 links the solar cell array 200 and the system power supply 300 to each other. The power conversion device 100 boosts the DC voltage output from the solar cell array 200, converts the boosted DC voltage into an AC voltage, and outputs the AC voltage to the system power supply 300 side. The power conversion device 100 may be a power conditioner.

  In the solar cell array 200, a plurality of solar cell strings in which a plurality of solar cell modules are connected in series are connected in parallel. The solar cell array 200 is an example of a distributed power source. As the distributed power source, a gas engine, a gas turbine, a micro gas turbine, a fuel cell, a wind power generator, an electric vehicle, a power storage system, or the like may be used. The system power supply 300 is an example of a power supply. The system power source 300 is, for example, a power source operated by an electric power supplier, and may be a power generation system such as thermal power, nuclear power, and hydropower.

  The power conversion device 100 is connected to the power generation management device 400 via the network 350. The power generation management device 400 communicates with the power conversion device 100 via the network 350. The power conversion device 100 may communicate with the power conversion device 100 via the network 350 in a wired or wireless manner.

  The power generation management device 400 predicts the power demand according to at least one parameter that affects the power demand such as season, temperature, humidity, and day of the week, and generates power so as to realize a supply amount corresponding to the predicted power demand. Create a plan. The system power supply 300 generates power based on the power generation plan. Furthermore, the power generation management device 400 transmits a command signal for instructing to suppress the power output from the power conversion device 100 via the network 350 when the power demand is small based on the power generation plan. To 100.

  The power conversion device 100 suppresses the output power in response to the command signal from the power generation management device 400. The power conversion device 100 specifies the timing for suppressing the power based on the received command signal. The power conversion device 100 may start the power suppression control in response to receiving the command signal. The power conversion device 100 may start the power suppression control from timing such as the time indicated by the received command signal. The power conversion device 100 may execute power suppression control during the power suppression period indicated in the received command signal.

  Here, the power conversion device 100 becomes equal to or lower than a reference output (W) that is lower by a predetermined rate than a maximum rated output (W) predetermined with respect to the power conversion device 100 according to the command signal. Thus, it is conceivable to execute the power suppression control. However, according to such control, for example, due to the influence of cloudy weather, the power output from the solar cell array 200 is already greater than the reference output without performing the power suppression control in the period of executing the power suppression control. It may be small. In such a case, even if a request for power suppression control is received, the power conversion apparatus 100 does not substantially execute power suppression control during the power suppression control period. As described above, when the power conversion device 100 executes the power suppression control based on the reference output determined in advance from the maximum rated output (W) or the like, the power suppression control is effectively performed due to external factors such as weather. It may not be executed.

  So, in 1st Embodiment, the power converter device 100 is based on the command signal from the electric power generation management apparatus 400, the reference period defined based on the timing which should carry out power suppression control, for example, until the timing which should carry out power suppression control. During the reference period, power suppression control is executed based on at least one of a power value (W) indicating the magnitude of the power output from the power conversion device 100 and a power amount (Wh) indicating the integrated power per unit time.

  For example, the power conversion apparatus 100 derives at least one of an average power value (W) and an average power amount (Wh) in the past 30 minutes, 1 hour, 2 hours, etc. until the timing at which power suppression control is to be performed. For example, the power conversion apparatus 100 derives a reference power value (W) or a reference power amount (Wh) that is reduced by a predetermined ratio from the average power value (W) or the average power amount (Wh). Then, the power conversion device 100 outputs the output power (W) or the power amount (Wh) from the timing at which the power suppression control is performed so that the output power (W) or the power amount (Wh) does not exceed the reference power value (W) or the reference power amount (Wh). To control the power. The reference power value (W) or the reference power amount (Wh) is derived based on the power or power amount actually output by the power conversion apparatus 100 immediately before starting the power suppression control. It is possible to prevent the power suppression control from being effectively executed due to the physical factor.

  FIG. 2 is a diagram illustrating an example of a circuit configuration of the power conversion device 100 according to the first embodiment. The power conversion device 100 includes a power conversion unit 60 and a control device 70. The power conversion unit 60 boosts the DC voltage output from the solar cell array 200, converts the boosted DC voltage into an AC voltage, and outputs the AC voltage to the load 310 and the system power supply 300 side. The power conversion unit 60 is connected to the system power supply 300. The control device 70 controls the power conversion unit 60. The power conversion unit 60 includes a capacitor C1, a booster circuit 20, a capacitor C2, an inverter 40, a coil L2, a capacitor C3, and a relay 50.

  One end and the other end of the capacitor C <b> 1 are electrically connected to the positive terminal and the negative terminal of the solar cell array 200 to smooth the DC voltage output from the solar cell array 200. The booster circuit 20 may be a so-called chopper type switching regulator. The booster circuit 20 boosts the voltage from the solar cell array 200. The booster circuit 20 may be constituted by an insulating booster circuit having a transformer winding such as a half-bridge booster circuit or a full-bridge booster circuit.

  Capacitor C2 smoothes the DC voltage output from booster circuit 20. The inverter 40 includes a switch. When the switch is turned on / off, the inverter 40 converts the DC voltage output from the booster circuit 20 into an AC voltage and outputs the AC voltage to the system power supply 300 side. The inverter 40 may be constituted by, for example, a single-phase full-bridge PWM inverter that includes four semiconductor switches that are bridge-connected. Of the four semiconductor switches, one pair of semiconductor switches is connected in series. Of the four semiconductor switches, the other pair of semiconductor switches are connected in series and connected in parallel with the one pair of semiconductor switches.

  A coil L2 and a capacitor C3 are provided between the inverter 40 and the system power supply 300. The coil L2 and the capacitor C3 remove noise from the AC voltage output from the inverter 40. A relay 50 is provided between the capacitor C3 and the system power supply 300. Relay 50 switches whether to electrically disconnect between inverter 40 and system power supply 300. When the relay 50 is turned on, the power conversion apparatus 100 and the system power supply 300 are electrically connected, and when the relay 50 is turned off, the power conversion apparatus 100 and the system power supply 300 are electrically disconnected.

  The power conversion device 100 further includes voltage sensors 12, 16, and 22 and current sensors 14, 18, and 19. The voltage sensor 12 detects a voltage V1 corresponding to a potential difference between both ends of the solar cell array 200. The voltage sensor 16 detects a voltage V2 corresponding to a potential difference between both ends on the output side of the booster circuit 20. The voltage sensor 22 detects a voltage V3 corresponding to a potential difference between both ends on the output side of the inverter 40.

  The current sensor 14 detects a current I1 output from the solar cell array 200 and flowing to the input side of the booster circuit 20. The current sensor 18 detects the current I2 output from the booster circuit 20. The current sensor 19 detects the current I3 output from the inverter 40.

  Control device 70 includes voltage booster circuit 20 and an inverter based on voltage and current detected by voltage sensors 12, 16 and 22 and current sensors 14, 18 and 19 so that maximum power can be obtained from solar cell array 200. The switching operation of 40 is controlled, the DC voltage output from the solar cell array 200 is boosted, the boosted DC voltage is converted into an AC voltage, and output to the system power supply 300 side.

  FIG. 3 shows an example of functional blocks of the control device 70. The control device 70 includes a current value acquisition unit 72, a voltage value acquisition unit 74, a power value acquisition unit 76, a power value storage unit 78, a reception unit 80, a reference power value derivation unit 82, and a power control unit 84.

  The current value acquisition unit 72 sequentially acquires a current value indicating the magnitude of the current I3 output from the inverter 40 via the current sensor 19. The voltage value acquisition unit 74 sequentially acquires a voltage value indicating the magnitude of the voltage V3 corresponding to the potential difference between both ends on the output side of the inverter 40 via the voltage sensor 22.

  The power value acquisition unit 76 multiplies the current value acquired by the current value acquisition unit 72 by the voltage value acquired by the voltage value acquisition unit 74, thereby obtaining the magnitude of power output from the power conversion unit 60. The indicated power value (W) is acquired sequentially. The power value acquisition unit 76 registers the sequentially acquired power values (W) in the power value storage unit 78 in association with the respective times corresponding to the sequentially acquired power values (W). The power value storage unit 78 stores the power value (W) and time in association with each other.

  The receiving unit 80 receives a command signal instructing to suppress the power output from the power conversion unit 60 from the power generation management device 400 via the network 350. For example, the command signal may indicate the timing at which the power output from the power conversion unit 60 should be suppressed. The command signal may indicate the timing at which the power conversion unit 60 should start the power suppression control. The command signal may indicate the timing at which the power conversion unit 60 should start the power suppression control and the timing at which the power conversion unit 60 should end the power suppression control. The command signal may indicate a command indicating that the power conversion unit 60 executes the power suppression control when the receiving unit 80 receives the command signal.

  Here, the timing at which the power output from the power conversion unit 60 should be suppressed may be, for example, the time when the power suppression control is started or the period during which the power suppression control is executed. The timing at which the power output from the power conversion unit 60 should be suppressed may be any time within the period in which the power suppression control is executed.

  The power control unit 84 includes at least one of a plurality of power values (W) acquired by the power value acquisition unit 76 within a reference period determined based on the timing at which the power output from the power conversion unit 60 should be suppressed. Based on the two power values (W), the power output from the power converter 60 is controlled. The power control unit 84 includes at least one power in a reference period before the timing at which the power output from the power conversion unit 60 should be suppressed among the plurality of power values (W) acquired by the power value acquisition unit 76. Based on the value (W), the power output from the power converter 60 is controlled.

  The power control unit 84 at least within a predetermined reference period until the timing at which the power output from the power conversion unit 60 should be suppressed among the plurality of power values (W) acquired by the power value acquisition unit 76. The power output from the power converter 60 may be controlled based on one power value (W).

  The reference power value deriving unit 82 derives a reference power value (W) based on at least one power value within the reference period among the plurality of power values acquired by the power value acquiring unit 76. The reference power value deriving unit 82 may derive a reference power value (W) based on a plurality of power values within the reference period among the plurality of power values acquired by the power value acquiring unit 76. The reference power value deriving unit 82 derives an average power value from each of the power values within the reference period among the plurality of power values acquired by the power value acquiring unit 76, and based on the average power value (W) The power value (W) may be derived. The reference power value deriving unit 82 uses the value obtained by multiplying the average power value (W) by a predetermined ratio F (F <1, for example, 0.8, 0.7, etc.) as the reference power. It may be derived as a value (W).

  The power control unit 84 may control the power output from the power conversion unit 60 based on the reference power value (W). The power control unit 84 may execute power suppression control that suppresses the power output from the power conversion unit 60 based on the reference power value (W). The power control unit 84 may specify the timing at which the power output from the power conversion unit 60 should be suppressed based on the command signal received by the receiving unit 80. And the electric power control part 84 may perform the electric power suppression control which suppresses the electric power output from the electric power conversion part 60 based on a reference | standard electric power value (W) from the identified timing. The power control unit 84 starts power suppression control for controlling the power output from the power conversion unit 60 based on the reference power value (W) from the timing at which the power output from the power conversion unit 60 should be suppressed. Good. The power control unit 84 suppresses the power output from the power conversion unit 60 so that the power value (W) indicating the magnitude of the power output from the power conversion unit 60 does not exceed the reference power value (W). Power suppression control may be executed.

  When the power suppression control is started and the power value (W) exceeds the reference power value (W), the power control unit 84 immediately converts the power value (W) to the reference power value (W ) The power conversion unit 60 may be controlled to be as follows. Alternatively, when the power value (W) exceeds the reference power value (W) at the time when the power suppression control is started, the power control unit 84 gradually increases the power value (W) from that point. (W) You may control the power converter 60 so that it may become below.

  FIG. 4 is a flowchart illustrating an example of power suppression control executed by the control device 70 according to the first embodiment. First, the receiving unit 80 receives a command signal from the power generation management device 400 via the network 350 (S100). The receiving unit 80 may receive a command signal indicating whether or not the power suppression control should be executed from the power generation management device 400 at a predetermined cycle (for example, every 30 minutes).

  The power control unit 84 specifies the timing of power suppression based on the command signal (S102). The power control unit 84 may specify the timing of power suppression by specifying the time when the power suppression control indicated by the command signal should be started. The power control unit 84 may specify the time when the receiving unit 80 receives the command signal as the timing at which power suppression should be started. The power control unit 84 may specify the time when the power control unit 84 confirms that the reception unit 80 has received the command signal as a timing at which power suppression should be started.

  Next, the reference power value deriving unit 82 specifies a reference period based on the specified timing (S104). The reference power value deriving unit 82 may specify a predetermined period until the specified timing as the reference period. The reference power value deriving unit 82 may specify a predetermined period until the time when the power suppression control is started as the reference period.

  The reference power value deriving unit 82 acquires a plurality of power values corresponding to the specified reference period from the power value storage unit 78, and derives an average power value based on the plurality of power values in the acquired reference period. The reference power value deriving unit 82 derives a reference power value by multiplying the average power value by a predetermined ratio F (S108). The reference power value deriving unit 82 may derive the reference power value at a constant rate F over the entire period for executing the power suppression control. The reference power value deriving unit 82 multiplies the average power value by a first ratio F1 (for example, 0.8) for the first period included in the suppression period in which the power suppression control is executed, so that the reference for the first period For the second period different from the first period included in the suppression period in which the power value is derived and the power suppression control is executed, the second ratio F2 (for example, 0.7) that is different from the first ratio F1 in the average power value. May be used to derive the reference power value for the second period. That is, the reference power value deriving unit 82 may dynamically change the reference power value during the suppression period in which the power suppression control is executed.

  The power control unit 84 performs power suppression control by controlling the power output from the power conversion unit 60 based on the derived reference power value from the identified timing (S110). The power control unit 84 controls the power output from the power conversion unit 60 so that the power value of the power output from the power conversion unit 60 does not exceed the derived reference power value from the specified timing. Good.

  FIG. 5 schematically shows a temporal change in the power value of the power output from the power conversion device 100 when the power suppression control is executed based on the reference power value.

  A curve L10 shows a change in the power value of the power output from the power conversion device 100 when the power suppression control is not executed in fine weather. A curve L12 shows a change in the power value of the power output from the power conversion device 100 when the power suppression control is executed in fine weather.

  A curve L20 shows a change in the power value of the power output from the power conversion device 100 when the power suppression control is not executed during cloudy weather. A curve L22 shows a change in the power value of the power output from the power conversion device 100 when power suppression control is executed during cloudy weather.

  The hatched region R10 indicates the amount of power suppressed by the power conversion device 100 when power suppression control is executed in fine weather. The hatched region R20 indicates the amount of power suppressed by the power conversion device 100 when power suppression control is executed during cloudy weather. In this way, the amount of power output from the power conversion device 100 can be effectively suppressed in both cases of fine weather and cloudy weather.

  According to the first embodiment, the power suppression control is executed based on the reference power value derived based on the average power value in a predetermined reference period until the power suppression start timing. Therefore, it is possible to prevent the power suppression control from being effectively executed due to external factors such as the weather.

  FIG. 6 shows functional blocks of the control device 70 according to the second embodiment. The control device 70 according to the second embodiment controls the power output from the power conversion unit 60 according to a predetermined power suppression schedule, and is based on a command signal received from the power generation management device 400. It differs from the control apparatus 70 which concerns on 1st Embodiment which specifies the timing which the conversion part 60 should suppress electric power.

  The control device 70 includes a power suppression schedule storage unit 86 instead of the reception unit 80. Note that the control device 70 may include both the receiving unit 80 and the power suppression schedule storage unit 86. The power suppression schedule storage unit 86 stores a power suppression schedule indicating a period during which the power conversion unit 60 should suppress power. The control device 70 may receive the power suppression schedule from the power generation management device 400 via the network 350 and register it in the power suppression schedule storage unit 86. The power suppression schedule may indicate the timing at which the power conversion unit 60 should start the power suppression control and the timing at which the power conversion unit 60 should end the power suppression control. The power suppression schedule may indicate a condition in which the power conversion unit 60 should start the power suppression control, for example, a condition that is determined with parameters such as season, temperature, humidity, and day of the week. For example, when the season is summer, the temperature is below the reference temperature, and the humidity is below the reference humidity, a condition for starting the power suppression control may be indicated in the power suppression schedule. The power control unit 84 refers to the power suppression schedule stored in the power suppression schedule storage unit 86 and specifies the timing at which the power conversion unit 60 should suppress power.

  The power control unit 84 includes at least one power value (W) within a reference period determined based on the timing specified by the power suppression schedule among the plurality of power values (W) acquired by the power value acquisition unit 76. Based on the above, the power output from the power converter 60 is controlled to execute the power suppression control. The power control unit 84 at least within a predetermined reference period until the timing at which the power output from the power conversion unit 60 should be suppressed among the plurality of power values (W) acquired by the power value acquisition unit 76. Based on one power value (W), the power output from the power conversion unit 60 may be controlled to execute power suppression control. The reference power value deriving unit 82 derives an average power value from each of the power values within the reference period among the plurality of power values acquired by the power value acquiring unit 76, and based on the average power value (W) The power value (W) may be derived. The reference power value deriving unit 82 uses the value obtained by multiplying the average power value (W) by a predetermined ratio F (F <1, for example, 0.8, 0.7, etc.) as the reference power. It may be derived as a value (W).

  FIG. 7 shows functional blocks of the control device 70 according to the third embodiment. The control device 70 according to the third embodiment controls the power output from the power conversion unit 60 based on the reference power amount determined based on the power value within the reference period. This is different from the control device 70 according to the second embodiment.

  The control device 70 according to the third embodiment includes a reference power amount deriving unit 90 instead of the reference power value deriving unit 82. The reference power amount deriving unit 90 calculates the reference power amount (Wh) based on at least one power value (W) within the reference period among the plurality of power values (W) acquired by the power value acquiring unit 76. To derive. The reference power amount deriving unit 90 derives the reference power amount (Wh) based on the plurality of power values (W) within the reference period among the plurality of power values (W) acquired by the power value acquiring unit 76. You can do it. The reference power amount deriving unit 90 derives an average power amount (Wh) within the reference period based on an integrated value obtained by integrating a plurality of power values (W) within the reference period, and performs a reference based on the average power amount (Wh). The amount of power (Wh) may be derived. The reference power amount deriving unit 90 uses the value obtained by multiplying the reference power amount (Wh) by a predetermined ratio F (F <1, for example, 0.8, 0.7, etc.) as a reference. You may derive | lead-out as electric energy (Wh).

  The power control unit 84 may execute the power suppression control by controlling the power output from the power conversion unit 60 based on the reference power amount (Wh). The power control unit 84 may specify the timing at which the power output from the power conversion unit 60 should be suppressed based on the command signal received by the receiving unit 80. And the electric power control part 84 may control the electric power output from the electric power conversion part 60 based on reference | standard electric energy (Wh) from the identified timing, and may perform electric power suppression control. The power control unit 84 starts power suppression control for controlling the power output from the power conversion unit 60 based on the reference power amount (Wh) from the timing at which the power output from the power conversion unit 60 should be suppressed. Good. The power control unit 84 sequentially derives a power amount (Wh) indicating an integrated value of power per unit time based on the power value (W) acquired by the power value acquisition unit 76, and the derived power amount ( The power output from the power converter 60 may be controlled so that Wh) does not exceed the reference power value (W).

  FIG. 8 is a flowchart illustrating an example of the power suppression control executed by the control device 70 according to the third embodiment. First, the receiving unit 80 receives a command signal from the power generation management device 400 via the network 350 (S200). The receiving unit 80 may receive a command signal indicating whether or not the power suppression control should be executed from the power generation management device 400 at a predetermined cycle (for example, every 30 minutes).

  The power control unit 84 specifies the timing of power suppression based on the command signal (S202). The power control unit 84 may specify the timing of power suppression by specifying the time at which the power conversion unit 60 indicated by the command signal should start the power suppression control. The power control unit 84 may specify the time when the receiving unit 80 receives the command signal as the timing at which power suppression should be started. The power control unit 84 may specify the time when the power control unit 84 confirms that the reception unit 80 has received the command signal as a timing at which power suppression should be started.

  Next, the reference power amount deriving unit 90 specifies a reference period based on the specified timing (S204). The reference power value deriving unit 82 may specify a predetermined period until the specified timing as the reference period. The reference power value deriving unit 82 may specify a predetermined period until the time when the power suppression control is started as the reference period.

  The reference power amount deriving unit 90 acquires a plurality of power values corresponding to the specified reference period from the power value storage unit 78, and derives the average power amount based on the plurality of power values in the acquired reference period. The reference power amount deriving unit 90 derives the reference power amount by multiplying the average power amount by a predetermined ratio F (S208). The reference power amount deriving unit 90 may derive the reference power amount at a constant rate F over the entire period for executing the power suppression control. The reference power amount deriving unit 90 multiplies the average power amount by a first ratio F1 (for example, 0.8) for the first period included in the suppression period in which the power suppression control is executed, thereby determining the reference for the first period. For the second period different from the first period included in the suppression period in which the power amount is derived and the power suppression control is executed, the second rate F2 (for example, 0.7) different from the first rate F1 in the average power amount. May be used to derive the reference power amount for the second period. That is, the reference power amount deriving unit 90 may dynamically change the reference power amount during the suppression period in which the power suppression control is executed.

  The power control unit 84 controls the power output from the power conversion unit 60 based on the derived reference power amount from the identified timing, and executes power suppression control (S210). The power control unit 84 controls the power output from the power conversion unit 60 so that the amount of power output from the power conversion unit 60 does not exceed the derived reference power amount from the specified timing. Good.

  FIG. 9 schematically shows a temporal change in the power value of the power output from the power conversion device 100 when the power suppression control is executed based on the reference power amount.

  A curve L30 shows a change in the power value output from the power conversion device 100 when the power suppression control is not executed. A curve L32 shows how the power value output from the power conversion device 100 changes when power suppression control is executed.

  According to 3rd Embodiment, the control apparatus 70 controls the electric power output from the power converter 60 based on reference | standard electric energy (Wh), and performs electric power suppression control. When the control device 70 controls the power output from the power conversion unit 60 based on the reference power value (W) as in the first embodiment and the second embodiment, the maximum power that can be output by the power conversion unit 60 Even if there is a period during which the power value is lower than the reference power value, the control device 70 can reduce the power value even if the maximum power value that can be output by the power conversion unit 60 can exceed the reference power value in the subsequent period. The power conversion unit 60 is controlled so as not to exceed the reference power value.

  However, when the control device 70 controls the power output from the power conversion unit 60 based on the reference power amount (Wh), the power amount may not exceed the reference power amount in the entire power suppression control period. . Therefore, when there is a period in which the maximum power that can be output by the power conversion unit 60 is lower than the reference power value, if the power amount (W) does not exceed the reference power amount (Wh), the control device 70 In this case, it is possible to cause the power conversion unit 60 to output power equal to or higher than the reference power value (W).

  For example, during the period indicated by the hatched region R12, the maximum power value that can be output by the power conversion unit 60 is lower than the reference power value. That is, for the period indicated by the hatched region R12, the amount of power to be suppressed is larger than the required suppression amount. When the control device 70 controls the power output from the power conversion unit 60 based on the reference power amount (Wh), the power amount (W) must exceed the reference power amount (Wh) for the period indicated by the hatched region R14. For example, the power conversion unit 60 can output power that is equal to or higher than the reference power value (W). Therefore, it can prevent that the electric power output from the power conversion part 60 is suppressed more than necessary because the control apparatus 70 performs power suppression control based on reference | standard electric energy (Wh). For example, when the control device 70 executes the power suppression control based on the reference power amount (Wh), the power amount indicated by the hatched region R14 is not unnecessarily suppressed.

  FIG. 10 shows functional blocks of the control device 70 according to the fourth embodiment. The control device 70 according to the fourth embodiment is different from the control device 70 according to each of the above embodiments in that it includes a reference power value deriving unit 82 and a reference power amount deriving unit 90, respectively.

  The power control unit 84 according to the fourth embodiment generates power based on the reference power value (W) derived by the reference power value deriving unit 82 and the reference power amount (Wh) derived by the reference power amount deriving unit 90. The power output from the conversion unit 60 is controlled to execute power suppression control.

  FIG. 11 is a flowchart illustrating an example of power suppression control executed by the control device 70 according to the fourth embodiment. First, the receiving unit 80 receives a command signal from the power generation management device 400 via the network 350 (S300). The receiving unit 80 may receive a command signal indicating whether or not the power suppression control should be executed from the power generation management device 400 at a predetermined cycle (for example, every 30 minutes).

  The power control unit 84 specifies the timing of power suppression based on the command signal (S302). The power control unit 84 may specify the timing of power suppression by specifying the time at which the power conversion unit 60 indicated by the command signal should start the power suppression control. The power control unit 84 may specify the time when the receiving unit 80 receives the command signal as the timing at which power suppression should be started.

  Next, the reference power value deriving unit 82 and the reference power amount deriving unit 90 identify the reference period based on the identified timing (S304). The reference power value deriving unit 82 and the reference power value deriving unit 82 may specify a predetermined period until the specified timing as the reference period. The reference power value deriving unit 82 may specify a predetermined period until the time when the power suppression control is started as the reference period.

  The reference power value deriving unit 82 acquires a plurality of power values corresponding to the specified reference period from the power value storage unit 78, and derives an average power value based on the plurality of power values in the acquired reference period. The reference power value deriving unit 82 derives the reference power value by multiplying the average power value by a predetermined ratio F. The reference power amount deriving unit 90 acquires a plurality of power values corresponding to the specified reference period from the power value storage unit 78, and derives the average power amount based on the acquired plurality of power values within the reference period. To do. The reference power amount deriving unit 90 derives the reference power amount by multiplying the average power amount by a predetermined ratio F (S308).

  The power control unit 84 performs power suppression control by controlling the power output from the power conversion unit 60 based on the derived reference power value (W) and the reference power amount (Wh) from the specified timing. (S310). The power control unit 84 determines that the power value (W) output from the power conversion unit 60 does not exceed the reference power value (W) from the specified timing, and the power amount (Wh) output from the power conversion unit 60. The power output from the power conversion unit 60 may be controlled so as not to exceed the derived reference power amount (Wh).

  The power control unit 84 controls the power output from the power conversion unit 60 so that the amount of power output from the power conversion unit 60 does not exceed the derived reference power amount. Here, in the first half of the power suppression period, when the maximum power value that can be output from the power conversion unit 60 is low due to the influence of cloudy weather or the like, and the amount of power to be suppressed in the power suppression period is excessively suppressed The power control unit 84 may increase the power output from the power conversion unit 60 so as to cancel out the suppressed excess power amount in the latter half of the power suppression period. However, if the power output from the power conversion unit 60 is extremely large in the second half period, for example, there is a possibility of adversely affecting a planned power generation plan. Therefore, when the amount of power to be suppressed in the power suppression period is excessively suppressed, the power control unit 84 may increase the power output from the power conversion unit 60 within a range that does not exceed the reference power value.

  The power supply system according to the second embodiment, the third embodiment, and the fourth embodiment may have the same system configuration as the power supply system according to the first embodiment shown in FIG. Further, the circuit configuration of the power conversion device 100 according to the second embodiment, the third embodiment, and the fourth embodiment may be the same as the circuit configuration of the power conversion device 100 according to the first embodiment shown in FIG.

  In addition, the control device 70 includes a receiving unit 80 that receives a command signal and a power suppression schedule storage unit 86, and performs power suppression control at each of the timing specified according to the power suppression schedule and the timing specified according to the command signal. May be performed.

  As described above, according to each embodiment, at least one of the reference power value (W) and the reference power amount (Wh) is based on at least one power value within a reference period determined based on the timing of executing power suppression control. Since the power output from the power converter 100 is controlled based on at least one of the reference power value (W) and the reference power amount (Wh), the power suppression control is effective due to external factors such as weather. Can be prevented from being executed automatically.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Power supply system 12 Voltage sensor 14 Current sensor 16 Voltage sensor 18 Current sensor 19 Current sensor 20 Booster circuit 22 Voltage sensor 40 Inverter 50 Relay 60 Power conversion part 70 Control apparatus 72 Current value acquisition part 74 Voltage value acquisition part 76 Electric power value acquisition part 78 Power value storage unit 80 Reception unit 82 Reference power value deriving unit 84 Power control unit 86 Power suppression schedule storage unit 90 Reference power amount deriving unit 100 Power conversion device 200 Solar cell array 300 System power source 310 Load 350 Network 400 Power generation management device

Claims (12)

A control device that controls power output from a power converter linked to a power source,
A power value acquisition unit for acquiring a power value indicating the magnitude of power output from the power conversion unit;
Of the plurality of power values acquired by the power value acquisition unit, the power based on at least one power value within a reference period determined based on a timing at which the power output from the power conversion unit should be suppressed A control apparatus provided with the electric power control part which performs the electric power suppression control which suppresses the electric power output from a conversion part. A reference power value deriving unit for deriving a reference power value based on at least one power value within the reference period among the plurality of power values acquired by the power value acquiring unit;
The control device according to claim 1, wherein the power control unit executes the power suppression control based on the reference power value.   The control device according to claim 2, wherein the power control unit controls the power output from the power conversion unit so that the power value does not exceed the reference power value. A reference power amount deriving unit for deriving a reference power amount based on at least one power value within the reference period among the plurality of power values acquired by the power value acquiring unit;
The control device according to claim 1, wherein the power control unit controls the power suppression control based on the reference power amount.   The control device according to claim 4, wherein the power control unit controls the power output from the power conversion unit so that the amount of power output from the power conversion unit does not exceed the reference power amount. A reference power value deriving unit for deriving a reference power value based on at least one power value within the reference period among a plurality of power values acquired by the power value acquiring unit;
A reference power amount deriving unit for deriving a reference power amount based on at least one power value within the reference period among a plurality of power values acquired by the power value acquiring unit;
The control device according to claim 1, wherein the power control unit executes the power suppression control based on the reference power value and the reference power amount. A receiver for receiving a command signal for instructing to suppress power output from the power converter;
The control device according to claim 1, wherein the power control unit specifies the timing based on the command signal.   The control device according to any one of claims 1 to 7, wherein the power control unit identifies the timing based on a power suppression schedule for suppressing power output from the power conversion unit. A control device according to any one of claims 1 to 8,
A power conversion device comprising: the power conversion unit that is controlled by the control device and converts direct current from a distributed power source into alternating current. The power conversion device according to claim 9,
A power supply system comprising the distributed power supply.   The power supply system according to claim 10, further comprising a power generation management device that transmits a command signal instructing to suppress power based on a power generation plan to the power conversion device. A control method for controlling power output from a power converter linked to a power source,
Obtaining a power value indicating the magnitude of power output from the power converter;
Based on at least one power value within a reference period determined based on the timing to suppress the power output from the power conversion unit among the plurality of power values acquired in the step of acquiring the power value, And a step of executing power suppression control for suppressing power output from the power converter.

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