JP2018143038A - Photovoltaic power generation system and power generation control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control technology for a power generation system using a solar panel capable of suppressing output fluctuation of a photovoltaic power generation system caused by solar radiation fluctuation.SOLUTION: A main controller 600 appropriately controls charge/discharge of a storage battery 300 in such a manner that input power to a power conditioner 500 is prevented from being suddenly fluctuated (namely, is settled equal to or less than a fixed fluctuation rate) while taking a charge/discharge state of the storage battery 300 into account regardless of fluctuation in generation power of a solar panel 100. Based on a solar radiation value representing a solar radiation amount by a solar radiation gauge 800 and a measurement of a panel temperature by a panel thermometer 700, the main controller 600 calculates a prediction value P(t+Δt) of generation power and derives an inclination SI of generation power.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a technology for controlling a power generation system using a solar panel.

The photovoltaic power generation system is attracting attention as infinite energy that does not depend on fossil fuels such as oil, and its value is expected to be further improved in the future. On the other hand, since a solar power generation system is a very unstable power generation facility whose power generation amount varies depending on weather conditions, it is important how efficiently the generated power can be used.
A solar power generation system supplies power generated by a solar panel to a household or industrial power system (hereinafter also collectively referred to as a “load”) while charging a surplus power to a storage battery. Loss of generated power is suppressed (see, for example, Patent Document 1).

  In general, a photovoltaic power generation system that uses the generated power of a solar panel and the discharged power of a storage battery includes a power conditioner (PCS). The power conditioner converts direct-current power such as generated power of the solar panel and discharge power of the storage battery into alternating-current power, and supplies the converted alternating-current power to the load.

JP 2008-48544 A

  By the way, since the power generation of the solar panel depends on unstable solar radiation, for example, if the amount of solar radiation suddenly increases, the power generated by the solar panel rapidly increases and the voltage of the power system abnormally increases. Invite. Although solar power generation is expected as one of the promising solutions to the energy resource problem that is getting worse year by year, it has been pointed out that a stable power supply of the solar power generation system is difficult due to fluctuations in solar radiation.

  The present invention has been made in view of the circumstances described above, and it is an object of the present invention to provide a power generation system control technique using a solar panel capable of suppressing the output fluctuation of the solar power generation system due to solar radiation fluctuations. And

  A photovoltaic power generation system according to one embodiment of the present invention charges a storage battery with a DC power generated by the solar panel based on a solar panel that generates direct-current power corresponding to solar radiation, a storage battery, and a given instruction. On the other hand, a charge / discharge control unit that discharges DC power charged in the storage battery, a central control unit that instructs the charge / discharge control unit to charge / discharge the storage battery according to the power generation state of the solar panel, and power generation by the solar panel A power conditioner that converts the generated DC power and the DC power discharged from the storage battery into AC power and supplies it to the load, and the central control unit has a rate of increase in DC power generated by the solar panel. Then, it is determined whether or not the preset upper limit threshold of the DC power fluctuation rate has been exceeded. If the rate of increase in DC power exceeds the upper limit threshold, the power conditioner As variation rate of the input power input to the burner is within the set range, indicating that control the charging of the storage battery to the charging and discharging control unit.

  In the above aspect, the central control unit detects whether or not the rate of increase in solar radiation intensity exceeds the upper solar radiation threshold, and exceeds the upper limit of solar radiation in consideration of the state of charge of the storage battery at that point in time. It is good also as a structure which instruct | indicates to a charging / discharging control part that the direct-current power equivalent to quantity is charged to a storage battery.

  In the above configuration, the central control unit determines whether the DC power generated by the solar panel or the DC power estimated to be generated exceeds a preset input upper limit threshold, and the DC power When the threshold value is exceeded, taking into consideration the state of charge of the storage battery at that time, the charge / discharge control unit is instructed to charge the storage battery with DC power corresponding to the excess amount or DC power estimated to be generated. It is good also as composition to do.

  A solar power generation system according to another aspect of the present invention charges a storage battery with DC power generated by the solar panel based on a solar panel that generates direct-current power according to solar radiation, a storage battery, and a given instruction. On the other hand, the charge / discharge control unit that discharges the DC power charged in the storage battery, the central control unit that instructs the charge / discharge control of the storage battery to the charge / discharge control unit according to the power generation state of the solar panel, and the solar panel A power conditioner that converts the generated DC power and the DC power discharged from the storage battery into AC power and supplies it to the load, and the central control unit reduces the DC power generated by the solar panel. Determines whether or not the DC power fluctuation rate falls below a preset lower threshold, and if the DC power falls below the lower threshold, the power condition is Rate of change in the input power to be input to fit the set range, instructs the charging and discharging control unit to control the discharging of the storage battery.

  In the above configuration, the central control unit detects whether or not the rate of decrease in solar radiation intensity is below the lower solar radiation threshold value, and when the solar radiation intensity falls below the lower solar radiation threshold value, it falls below in consideration of the discharge state of the storage battery at that time. It is good also as a structure which instruct | indicates to the charging / discharging control part that the direct-current power equivalent to quantity is discharged from a storage battery.

  In the above configuration, the central control unit determines whether the direct-current power generated by the solar panel or the direct-current power estimated to be generated falls below a preset input lower limit threshold, and the direct-current power is lower than the input lower limit. Instructs the charge / discharge control unit to discharge from the storage battery the DC power corresponding to the amount below or the DC power estimated to be generated in consideration of the discharge state of the storage battery at the time when the threshold is below the threshold. It is good also as composition to do.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the control technique of the power generation system using the solar panel which can suppress the output fluctuation | variation of the solar power generation system by a solar radiation fluctuation | variation.

It is a figure which shows the structure of the solar energy power generation system 1000 which concerns on this embodiment. It is a flowchart which shows the charging / discharging control process of a storage battery. It is a transition graph which shows the relationship between the electric power generated by a solar panel, and charging / discharging control.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. Further, the following embodiments are exemplifications for explaining the present invention, and are not intended to limit the present invention only to the embodiments. Furthermore, the present invention can be variously modified without departing from the gist thereof.

A. This embodiment <1. Configuration>
FIG. 1 is a diagram illustrating a configuration of a photovoltaic power generation system 1000 according to the present embodiment. The solar power generation system 1000 is a system that efficiently drives the load 900 using the power generated by the solar panel 100 and the power charged in the storage battery 300. The solar power generation system 1000 includes a solar panel 100, a current collection box 200, a storage battery 300, a DC / DC converter 400, a power conditioner 500, a main controller 600, a panel thermometer 700, a solar radiation meter 800, and a load 900. Is done.

  The solar panel 100 converts solar energy corresponding to solar radiation into electric energy to generate DC power. In the present embodiment, a solar panel array structure in which a plurality of solar panels are connected in series or in parallel and installed on a gantry or the like is abbreviated as a solar panel 100, but may be a single solar panel. . The solar panel 100 is connected to the power conditioner 500 through the current collection box 200.

  The current collection box 200 is a device that collects output (DC power) from the solar panel 100 or the storage battery 300.

  The storage battery 300 is a chargeable / dischargeable secondary battery that stores the generated power (DC power) of the solar panel 100. The storage battery 300 is connected to the power conditioner 500 through the DC / DC converter 400 and the backflow prevention diode D1. The DC / DC converter (charge / discharge control unit) 400 is a bidirectional converter, and boosts the output voltage of the storage battery 300 to a desired voltage under the control of the main controller 600, while the solar panel 100 It plays the role of reducing the generated voltage to the input voltage of the storage battery 300. The DC / DC converter 400 is configured by, for example, an IPM (Intelligent Power Module).

  The power conditioner 500 is a device that converts DC power supplied from the solar panel 100 or the storage battery 300 via the current collection box 200 into AC power. The AC power converted by the power conditioner 500 is supplied to various loads 900 such as a factory or an office building for commercial use.

  The main controller (central control unit) 600 includes an I / O interface, a CPU, a ROM, a RAM, and the like, and centrally controls each unit constituting the photovoltaic power generation system 1000. Specifically, the main controller 600 executes various programs stored in a ROM or the like, thereby controlling power input from the solar panel 100 to the power conditioner 500 or charging / discharging control of the storage battery 400. The DC / DC converter 400 controls the step-up operation, the step-down operation, the power supply to the load 900 by the power conditioner 500, and the like. Such a program is distributed in a state of being stored in a computer-readable recording medium such as a memory card or an optical disk, or provided through the Internet. Note that the program according to the present embodiment may be provided as a single application program, or may be provided as a module incorporated in a part of another program. Further, a part or all of the functions may be replaced by a dedicated circuit such as an ASIC.

  The output current of the solar panel 100 is detected by a current sensor C installed in the power supply path between the solar panel 100 and the current collection box 200. When the current sensor C detects the output current (generated current) of the solar panel 100, the current sensor C supplies a current detection signal representing the current value of the output current to the main controller 600. In FIG. 1, three current sensors C are illustrated, but one or more current sensors C may be used.

  The panel thermometer 700 automatically measures the panel temperature of the solar panel 100, stores the measured value of the panel temperature for a certain period in the internal memory, and stores the measured value of the panel temperature at a predetermined time interval (or on / off). Supply to the main controller 600 on demand.

  The solar radiation meter 800 is a device that measures the amount of solar radiation (irradiance intensity). In this embodiment, a semiconductor solar radiation meter using a semiconductor photodetector is used. Instead of the semiconductor type pyranometer, a thermal pyranometer using a thermopile (a plurality of thermocouples) may be used. However, since the thermal pyranometer has a slow response speed, it is desirable to use a semiconductor type pyranometer with higher sensitivity and higher response speed.

  The pyranometer 800 sequentially measures the amount of solar radiation (that is, irradiance), and supplies a solar radiation value indicating the measurement result to the main controller 600 at predetermined time intervals (or on-demand).

<2. Operation>
FIG. 2 is a flowchart showing a charge / discharge control process of the storage battery 300 that is executed intermittently by the main controller 600.
The main controller 600 reads information such as the generated power of the solar panel 100 (hereinafter simply referred to as “generated power”), the solar radiation value of the pyranometer 800, the measured value of the panel temperature of the panel thermometer 700, and the like (step) S100). The generated power of the solar panel 100 is the generated current, generated voltage of the solar panel 100 supplied from the current sensor C or voltage sensor (not shown) shown in FIG. 1, or the DC input voltage measured by the power conditioner 500. It can be obtained from the value and current value.

  Next, the main controller 600 calculates generated power P (t + Δt) ahead of Δt (step S110). That is, the main controller 600 determines delays (communication delays) in signals supplied from the sensors (ammeters, panel thermometers, pyranometers, etc.), attachment positions of the pyranometer 800, delays in control by the main controller 600, and the like. Considering this, the predicted value P (t + Δt) of the generated power ahead of Δt in anticipation of the delay Δt is calculated. Here, the predicted value P (t + Δt) of the generated power is obtained, for example, by applying n-order spline interpolation, a quadratic polynomial approximation model, or the like to the time when the generated power is obtained and the power value data set. Anyway. Of course, the method for obtaining the predicted value P (t + Δt) of the generated power shown in the present embodiment is merely an example, and various methods can be employed depending on the system design and the like, including a neural network method.

When the main controller 600 proceeds to step S120, the main controller 600 determines whether or not the predicted value P (t + Δt) of the generated power exceeds the maximum input power value (input upper limit threshold value) Pmx set in the power conditioner 500. (See formula (A)).
P (t + Δt)> Pmx (A)

  When the main controller 600 determines that the predicted value P (t + Δt) of the generated power exceeds the maximum input power value Pmx determined based on the DC input rated power of the power conditioner 500 (step S120; YES), the battery Based on the charge state detection information of the storage battery 300 supplied from a sensor (not shown) or the like, it is determined whether or not the storage battery 300 can be charged at that time (step S210). When the main controller 600 determines that the storage battery 300 is not in a chargeable state (step S210; NO), the main controller 600 stops charging without charging the storage battery 300 or if it has already been charged ( Step S240), the process ends. In this case, the main controller 600 may be controlled so that the surplus power Pss (= predicted value P (t + Δt) −maximum input power value Pmx of generated power) is discharged or consumed by a DC load or the like.

  On the other hand, if the main controller 600 determines in step S210 that the storage battery 300 can be charged (step S210; YES), the surplus power Pss (= predicted value P (t + Δt) of generated power−maximum input power value Pmx) and the time point The charging power Pch of the storage battery 300 is calculated based on the allowable charge amount (charging state) of the storage battery 300 at (Step S220). The main controller 600 controls the charging operation of the storage battery 300 (step S230), and ends the process when detecting that the charging power Pch is charged in the storage battery 300. As described above, when the predicted value P (t + Δt) of the generated power exceeds the maximum input power value Pmx determined based on the DC input rated power of the power conditioner 500, the main controller 600 at that time. In consideration of the state of charge of the storage battery 300, the DC / DC converter 400 is instructed to charge the storage battery 300 with the surplus power Pss.

  Further, when the main controller 600 determines in step S120 that the predicted value P (t + Δt) of the generated power is lower than the maximum input power value Pmx set in the power conditioner 500 (step S120; NO). It is determined whether or not the predicted value P (t + Δt) of the generated power is below a predetermined value Pmn (step S130). As the predetermined value Pmn, for example, an input power value to the power conditioner 500 set according to the required power of the load 900 can be considered, but any value can be set.

  When the main controller 600 determines that the predicted value P (t + Δt) of the generated power is below the predetermined value Pmn (step S130; YES), the main controller 600 determines whether or not the storage battery 300 can be discharged at that time (step S510). ). When the main controller 600 determines that the storage battery 300 is not in a dischargeable state (step S510; NO), the main controller 600 stops the discharge without discharging the storage battery 300 or when it has already been discharged ( Step S530), the process ends.

  On the other hand, when the main controller 600 determines that the storage battery 300 is in a dischargeable state (step S510; YES), the insufficient power Pst (= predetermined value Pmn−predicted value P (t + Δt) of generated power) and the current time Based on the allowable discharge amount of the storage battery 300, the discharge power Pdh of the storage battery 300 is calculated (step S520). The main controller 600 controls the discharge operation of the storage battery 300 (step S430), and ends the process when detecting that the discharge power Pdh is discharged from the storage battery 300. Thus, when the predicted value P (t + Δt) of the generated power is lower than the minimum input power value Pmn set in the power conditioner 500, the main controller 600 discharges the storage battery 300 at that time. In consideration of the state, the DC / DC converter 400 is instructed to supplement (ie, discharge) the insufficient power Pst with the storage battery 300.

  Further, when the main controller 600 determines that the predicted value P (t + Δt) of the generated power is not lower than the minimum input power value Pmn, that is, exceeds the predetermined value Pmn (step S130; NO), the generated power is predicted. It is determined whether or not the differential value of the value P (t + Δt), that is, the slope S1 of the generated power (= dP (t + Δt) / dt; here, the rate of increase of the generated power) exceeds the predetermined value Pdx (step S140). ). The predetermined value Pdx is set within a range in which the input power to the power conditioner 500 does not fluctuate (here, as an upper limit value that prevents a sudden increase in input power). In the present embodiment, the main controller 600 uses the solar radiation value representing the amount of solar radiation by the solar radiation meter 800 and the measured value of the panel temperature by the panel thermometer 700, and the predicted value P (t + Δt) of the generated power and the slope S1 of the generated power. Ask for. However, if a strong correlation is observed between the solar radiation value and the predicted value P (t + Δt) of the generated power, the slope S1 of the generated power can be estimated using the solar radiation value P (t + Δt) or power generation. The power gradient S1 may be obtained.

  The predetermined value Pmx may be a maximum input power value (fixed value) determined based on the DC input rated power of the power conditioner 500, but is set as a variable value according to the charging state detection information of the storage battery 300 and the like. It is also possible. When the charge amount of the storage battery 300 is low, the value of the predetermined value Pmx is set low so that the storage battery 300 is easily charged. Similarly, the predetermined value Pmn can also be set as a variable value instead of a fixed value, and when the charge amount of the storage battery 300 is high, the predetermined value Pmn can be set higher to facilitate the discharge of the storage battery 300. . As a result, it is possible to realize an efficient solar power generation system in which the fluctuation of the input power to the power conditioner 500 is small.

  When the main controller 600 determines that the slope S1 of the generated power exceeds the predetermined value Pdx (step S140; YES), based on the charge state detection information of the storage battery 300 supplied from a battery sensor (not shown) or the like, It is determined whether or not the storage battery 300 can be charged at that time (step S310). When the main controller 600 determines that the storage battery 300 is not in a chargeable state (step S310; NO), the main controller 600 stops charging / discharging without charging / discharging the storage battery 300 or when it has already been charged / discharged. (Step S160), and the process ends. In this case, the main controller 600 may be controlled so that the surplus power Pss is discharged or consumed by a DC load or the like.

  On the other hand, when the main controller 600 determines in step S310 that the storage battery 300 can be charged (step S310; YES), the slope S1 of generated power (= dP (t + Δt) / dt; here, the rate of increase of generated power), Based on the allowable charge amount of the storage battery 300 at the time, the charging power Pch of the storage battery 300 is calculated (step S320). The main controller 600 controls the charging operation of the storage battery 300 (step S230), and ends the process when detecting that the charging power Pch is charged in the storage battery 300.

  If the main controller 600 determines in step S140 that the slope S1 of the generated power is below the predetermined value Pdx (step S140; NO), the differential value of the predicted value P (t + Δt) of the generated power, that is, power generation It is determined whether or not the power slope Sl (= dP (t + Δt) / dt) is below a predetermined value −Pdx (step S150). The predetermined value -Pdx is set in a range where the input power to the power conditioner 500 does not fluctuate (here, as a lower limit value that prevents a sudden drop in input power). In addition, since the method for obtaining the slope S1 of the generated power has already been described, the description is omitted here.

  When the main controller 600 determines that the slope S1 (= dP (t + Δt) / dt) of the generated power is not lower than the predetermined value −Pdx (step S150; NO), the main controller 600 performs control to stop charging / discharging of the storage battery 300. (Step S160), the process ends. That is, if the slope S1 of the generated power is not less than the predetermined value −Pdx, it can be determined that the input power to the power conditioner 500 is within a range that does not change suddenly. Control to stop charging / discharging.

On the other hand, when the main controller 600 determines that the slope S1 of generated power (= dP (t + Δt) / dt; here, the rate of decrease in generated power) is below a predetermined value −Pdx (step S150; YES). It is determined whether or not the storage battery 300 can be discharged at that time (step S410). When the main controller 600 determines that the storage battery 300 is not in a dischargeable state (step S410; NO), the main controller 600 stops charging / discharging without charging / discharging the storage battery 300 or when it has already been charged / discharged. (Step S160), and the process ends.

  On the other hand, when the main controller 600 determines that the storage battery 300 is in a dischargeable state (step S410; YES), the slope of the generated power Sl (= dP (t + Δt) / dt; ) And the discharge power Pdh of the storage battery 300 is calculated based on the allowable discharge amount of the storage battery 300 at the time (step S420). The main controller 600 controls the discharge operation of the storage battery 300 (step S430), and ends the process when detecting that the discharge power Pdh is discharged from the storage battery 300. Note that the predetermined values Pdx and -Pdx may also be variable according to the charge state detection information of the storage battery 300, similarly to the predetermined values Pmx and the predetermined values Pmn.

<Relationship between generated power and charge / discharge control>
FIG. 3 is a transition graph showing the relationship between the power generated by the solar panel 100 and the charge / discharge control. The upper graph in FIG. 3 shows the transition of the generated power of the solar panel 100 (one-dot chain line) and the input power of the power conditioner 500 (thick solid line) in a certain time zone, and the lower graph in FIG. The transition of charge / discharge power is shown. The horizontal axis represents time, and the vertical axis represents power.

  As shown in FIG. 3, the charge / discharge control of the storage battery 300 is appropriately performed so that the fluctuation rate of the input power to the power conditioner 500 falls within a certain range regardless of the fluctuation of the generated power of the solar panel 100. (See FIG. 2).

  For example, as shown in FIG. 3A, when the rise (= positive slope S1) of the generated power of the solar panel 100 becomes larger than a predetermined value Pdx (here, the rate of increase of the generated power increases), the main The controller 600 performs charging control of the storage battery 300 so that the input power to the power conditioner 500 increases slowly (see a part in FIG. 3).

  On the other hand, as shown in FIG. 3B, when the fall of the generated power of the solar panel 100 (= negative slope S1) becomes larger than the predetermined value −Pdx (here, the rate of decrease of the generated power becomes large). The main controller 600 controls the discharge of the storage battery 300 so that the input power to the power conditioner 500 is slowly lowered (see part b in FIG. 3).

  However, as indicated by Z in FIG. 3, the rising of the generated power of the solar panel 100 is steep, but even if the generated power falls from the middle, the storage battery 300 must continue to be charged. A case arises (see z portion in FIG. 3).

  In this case, if the charge / discharge control of the storage battery 300 is determined based on the inclination of the generated power, and the charging of the storage battery 300 is stopped when the generated power falls, the storage battery 300 can be charged only in a very short time. This is not performed, and as a result, the input power of the power conditioner 500 fluctuates rapidly. In order to solve such a problem, the charge / discharge control of the storage battery 300 is appropriately performed so that the input power to the power conditioner 500 is kept below a certain fluctuation rate while considering the amount of power charged / discharged to the storage battery 300. Realize what to do. In addition, in order to keep the input to the power conditioner 500 below a certain fluctuation rate, the charging / discharging of the storage battery 300 is controlled not only based on the gradient of the generated power but also based on the history of the generated power. You may do it.

  As described above, according to the present embodiment, the input power to the power conditioner 500 does not change suddenly regardless of fluctuations in the generated power of the solar panel 100 (that is, falls within a certain fluctuation rate). Thus, charging / discharging of the storage battery 300 is controlled. As a result, it is possible to stably supply power to the load connected to the power conditioner 500.

B. Others The slope Sl of the power generated by the solar panel 100 may be estimated as follows. For example, it is detected whether or not the solar radiation value (solar radiation intensity) obtained by the solar radiation meter 800 exceeds a set upper solar radiation threshold, and when the upper solar radiation threshold is exceeded, the slope S1 of the generated power is a predetermined value. While it is determined that Pdx has been exceeded (step S140; YES), it is detected whether the solar radiation value (solar radiation intensity) has fallen below the set lower solar radiation threshold, and if it falls below the lower solar radiation threshold, It may be determined that the power slope S1 is below a predetermined value −Pdx (step S150; YES).

  When it is determined that the power conditioner 500 is out of order, the main controller 600 may control the storage battery 300 to charge the power generated by the solar panel 100. For example, in the case where the power conditioner 500 is in a stopped state without inputting the power generation output of the solar panel 100 even though the solar radiation intensity of a predetermined level or more is detected in the solar radiation meter 800, the main controller 600 By controlling the generated power of the optical panel 100 to charge the storage battery 300, the generated power of the solar panel 100 can be used without waste.

  Further, the main controller 600 may perform the following control in order to maximize the generated power of the solar panel 100. That is, the main controller 600 performs maximum power point tracking control for maximizing the generated power of the solar panel 100, while charging the storage battery 300 from the solar panel 100 while the power conditioner 500 is stopped. Determines the charging voltage for the storage battery 300 by learning the DC voltage at the time of power generation of the solar panel from the solar radiation value of the solar radiation meter 800 and the panel temperature of the panel thermometer 700 at the time of maximum power tracking control. Also good. In addition, when the power conditioner 500 is in an operating state and the main controller 600 is charged or discharged from the solar panel 100 to the storage battery 300, the main controller 600 follows the voltage determined by the power conditioner 500 to charge the storage battery 300. The voltage or discharge voltage may be determined.

  Here, the steps in each process described above in this specification can be arbitrarily changed in order or executed in parallel as long as the process contents do not contradict each other.

  In addition, a program for performing each process described in this specification may be stored in a recording medium. If this recording medium is used, the program can be installed in a computer including the main controller 600. Here, the recording medium storing the program may be a non-transitory recording medium. The non-transitory recording medium is not particularly limited, but may be a recording medium such as a CD-ROM.

DESCRIPTION OF SYMBOLS 1000 ... Solar power generation system, 100 ... Solar panel, 200 ... Current collection box, 300 ... Storage battery, 400 ... DC / DC converter, D1 ... Backflow prevention diode, 500 ... Power conditioner, 600 ... Main controller, 700 ... Panel Thermometer, 800 ... Pirometer, 900 ... Load

Claims (12)

A solar panel that generates direct-current power in response to solar radiation;
A storage battery,
Based on a given instruction, while charging the storage battery with DC power generated by the solar panel, a charge / discharge control unit that discharges the DC power charged in the storage battery;
A central control unit that instructs charging / discharging of the storage battery to the charge / discharge control unit according to a power generation state of the solar panel,
DC power generated by the solar panel and DC power discharged from the storage battery are converted into AC power, and a power conditioner that supplies the load is provided.
The central control unit
When the rate of increase of DC power generated by the solar panel exceeds a preset upper limit threshold value of DC power fluctuation rate, the rate of increase of DC power exceeds the upper limit threshold value Is a photovoltaic power generation system that instructs the charge / discharge control unit to control charging of the storage battery so that the fluctuation rate of input power input from the solar panel to the power conditioner falls within a set range. . A solar panel that generates direct-current power in response to solar radiation;
A storage battery,
Based on a given instruction, while charging the storage battery with DC power generated by the solar panel, a charge / discharge control unit that discharges the DC power charged in the storage battery;
A central control unit that instructs charging / discharging of the storage battery to the charge / discharge control unit according to a power generation state of the solar panel,
DC power generated by the solar panel and DC power discharged from the storage battery are converted into AC power, and a power conditioner that supplies the load is provided.
The central control unit
When the rate of decrease in DC power generated by the solar panel is less than a preset lower limit threshold of DC power fluctuation rate, the rate of decrease in DC power is below the lower limit threshold Is a photovoltaic power generation system that instructs the charge / discharge control unit to control discharge to the storage battery so that a variation rate of input power input from the solar panel to the power conditioner falls within a set range. . The central control unit
The solar radiation intensity is acquired, and the DC power increase rate is obtained based on the acquired solar radiation intensity increase rate, while detecting whether the solar radiation intensity increase rate exceeds an upper solar radiation threshold, and the upper limit solar radiation intensity is detected. The charge / discharge control unit is instructed to charge the storage battery with the DC power corresponding to the excess amount in consideration of the state of charge of the storage battery at the time when the value is exceeded. The photovoltaic power generation system described in 1. The central control unit
The solar radiation intensity is acquired, and the DC power decrease rate is obtained based on the acquired solar radiation intensity decrease rate, while it is detected whether the solar radiation intensity decrease rate is below a lower solar radiation threshold, and the lower solar radiation intensity is detected. The charging / discharging control unit is instructed to discharge the direct-current power corresponding to the reduced amount from the storage battery in consideration of a discharge state of the storage battery at the time when the value is lower than the value. The photovoltaic power generation system described in 1. The central control unit
Along with the solar radiation intensity, the panel temperature of the solar panel is acquired, the direct current power generated by the solar panel is estimated based on the acquired solar radiation intensity and the panel temperature, and the rate of increase of the estimated direct current power is estimated. When the battery exceeds the upper threshold, the charge / discharge control unit is instructed to charge the storage battery with the DC power corresponding to the excess amount in consideration of the state of charge of the storage battery at the time. Item 4. The photovoltaic power generation system according to item 3. The central control unit
Along with the solar radiation intensity, the panel temperature of the solar panel is acquired, and based on the acquired solar radiation intensity and the panel temperature, the direct current power generated by the solar panel is estimated, and the estimated rate of decrease in the direct current power When the battery is below the lower limit threshold, the charge / discharge control unit is instructed to discharge the direct-current power corresponding to the reduced amount from the storage battery in consideration of the discharge state of the storage battery at the time. Item 5. A photovoltaic power generation system according to item 4.   The solar power generation system according to any one of claims 3 to 6, further comprising a semiconductor type solar radiation meter for measuring the solar radiation intensity. The central control unit
When the power conditioner is in a stopped state without inputting the DC power generated by the solar panel even though the solar radiation intensity of a predetermined level or more is detected, the DC power is stored in the storage battery. The photovoltaic power generation system according to claim 3 or 5, wherein the charge / discharge control unit is instructed to be charged. A solar panel that generates direct-current power in response to solar radiation;
A storage battery,
A measuring unit for measuring the panel temperature and the amount of solar radiation of the solar panel;
Based on a given instruction, while charging the storage battery with DC power generated by the solar panel, a charge / discharge control unit that discharges the DC power charged in the storage battery;
A central control unit that instructs charging / discharging of the storage battery to the charge / discharge control unit according to a power generation state of the solar panel,
DC power generated by the solar panel and DC power discharged from the storage battery are converted into AC power, and a power conditioner that supplies the load is provided.
The central control unit
A controller that performs maximum power point tracking control for maximizing the DC power generated by the solar panel;
When the power conditioner is in a stopped state and the battery is charged from the solar panel, the direct current during power generation by the solar panel is calculated from the solar radiation amount and the panel temperature at the time of the maximum power point tracking control. A solar power generation system comprising: a determination unit that determines a charging voltage for the storage battery by learning a voltage. The determination unit is
When the power conditioner is in an operating state and the storage battery is charged or discharged from the solar panel, the charging voltage or discharging voltage of the storage battery is determined following the voltage determined by the power conditioner. The solar power generation system according to claim 9. Based on a solar panel that generates direct-current power corresponding to solar radiation, a storage battery, and a given instruction, the direct-current power generated by the solar panel is charged into the storage battery, while the direct-current power charged in the storage battery A central control unit for instructing charging / discharging of the storage battery to the charge / discharge control unit according to a power generation state of the solar panel, DC power generated by the solar panel, And a power generation control program for a photovoltaic power generation system comprising a power conditioner that converts DC power discharged from the storage battery into AC power and supplies the power to a load,
In the central control unit,
If the rate of increase in DC power generated by the solar panel exceeds a preset upper threshold, and if the DC power exceeds the upper threshold, the solar panel A power generation control program for instructing the charge / discharge control unit to control charging of the storage battery so that a fluctuation rate of input power input to a power conditioner falls within a set range. Based on a solar panel that generates direct-current power corresponding to solar radiation, a storage battery, and a given instruction, the direct-current power generated by the solar panel is charged into the storage battery, while the direct-current power charged in the storage battery A central control unit for instructing charging / discharging of the storage battery to the charge / discharge control unit according to a power generation state of the solar panel, DC power generated by the solar panel, And a power generation control program for a photovoltaic power generation system comprising a power conditioner that converts DC power discharged from the storage battery into AC power and supplies the power to a load,
In the central control unit,
When the rate of decrease in the DC power generated by the solar panel is less than a preset lower threshold, if the DC power is lower than the lower threshold, the solar panel A power generation control program for instructing the charge / discharge control unit to control discharge of the storage battery so that a fluctuation rate of input power input to a power conditioner falls within a set range.