JP5681069B2 - Multi-power conditioner system - Google Patents

Multi-power conditioner system Download PDF

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JP5681069B2
JP5681069B2 JP2011188810A JP2011188810A JP5681069B2 JP 5681069 B2 JP5681069 B2 JP 5681069B2 JP 2011188810 A JP2011188810 A JP 2011188810A JP 2011188810 A JP2011188810 A JP 2011188810A JP 5681069 B2 JP5681069 B2 JP 5681069B2
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power
storage
conditioner
output
line
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JP2013051833A (en
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富弘 小口
富弘 小口
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ニチコン株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

  The present invention relates to a separate multi-power conditioner system including a photovoltaic power generation system and a power storage system.

  In recent years, from the viewpoint of global warming prevention, new energy sources that do not rely on fossil fuels, in particular, power generation systems that use natural energy sources have been actively studied. Among them, the photovoltaic power generation system is expected to become more popular in the future because the power generation cost is approaching the same level as the power generation cost of the existing power generation system.

  Also, in recent years, power storage systems that aim at leveling of power demand and reducing electric charges by discharging storage batteries charged with inexpensive late-night power during the daytime when power demand is large are becoming widespread. The power storage system is designed to be retrofitted to an existing photovoltaic power generation system, and is designed to be integrated with the photovoltaic power generation system from the beginning and introduced at the same time as the photovoltaic power generation system. Some are designed intentionally.

  The latter power storage system and solar power generation system (hereinafter collectively referred to as “integrated multi-power conditioner system”) have the advantage that the power storage system and the solar power generation system can be controlled in a highly coordinated manner. is there. For example, in the integrated multi-power conditioner system 100 described in Patent Document 1 shown in FIG. 6, when the generated power of the solar battery 101 is larger than the power used by the load R, the surplus is transferred to the grid G in reverse power flow (power If the amount of power sold is too high and the system voltage rises, the power generated by the solar cell 101 is sent via the DC / DC converter 102 and the bidirectional DC / DC converter 103. It is also possible to charge the storage battery 104 by supplying it to the storage battery 104.

  On the other hand, the former power storage system and solar power generation system (hereinafter collectively referred to as “separate type multi-power conditioner system”) are small scales as needed without replacing the existing solar power generation system. There is a merit that the introduction cost is very cheap because it is only necessary to make a simple modification. For this reason, in the present day when the spread of solar power generation systems has progressed to some extent, there is a tendency that a separate type multi-power conditioner system is desired rather than an integrated type.

JP 2004-180467 A (particularly FIG. 5)

  By the way, if the amount of electric power sold increases with the spread of the solar power generation system, it is expected that the problem of the system voltage increase will become more apparent. Therefore, in the electric power industry, it is necessary to provide a solar power generation system in each home as an essential function with the function of stopping power sales when the system voltage rises above a specified voltage (hereinafter referred to as “output suppression function”). Are considering.

  The output suppression function itself can be technically realized relatively easily. For example, in the integrated multi-power conditioner system 100 shown in FIG. 6, the bi-directional AC / DC inverter 105 that converts the DC power that has been stepped up / down to an appropriate voltage by the DC / DC converter 102 into AC power is stopped. By doing, the path | route from the solar cell 101 to the system | strain G can be interrupted | blocked, and it can prevent that a system | strain voltage raises further. In the separate type multi-power conditioner system, the output suppression function can be realized by the same method.

  However, the conventional separate type multi-power conditioner system is not configured so that the photovoltaic power generation system and the power storage system can be highly coordinated. Therefore, when the above path is interrupted, the solar cell generates power. There was a problem that the generated electric power obtained thereby could not be supplied anywhere. In other words, the conventional separate multi-power conditioner system cannot effectively use the power generated by the photovoltaic power generation system when the output is suppressed, and from the user's standpoint, the merit of introducing the separate multi-power conditioner system The result was damaged.

  The present invention has been made in view of the above circumstances, and the problem is that a separate type multi-power conditioner system capable of effectively utilizing the generated power of the solar power generation system even when the output is suppressed. Is to provide.

In order to solve the above problems, a multi-power conditioner system according to the present invention includes a multi-power conditioner including a photovoltaic power generation system and a power storage system connected to power lines respectively branched from a main power line connecting a system and a load. The solar power generation system includes a solar battery and a power generation conditioner that supplies power from the solar battery to the main power line, and the power storage system supplies power to the storage battery and the storage battery. A power storage power conditioner that supplies power to the load while preventing the reverse power flow to the grid by reverse power flow prevention control, and each of the power generation power conditioner and the power storage power conditioner is Communication means capable of communicating with each other, and from the power generation power conditioner to the storage power conditioner. When the output is suppressed by suppressing the voltage rise of the system, the output suppression information is shared between the power generation power conditioner and the storage power conditioner by communication between the communication means. as output suppression operation, the power supply to the trunk power line is stopped from generating power conditioner, the DC power supplied from the power generating power conditioner through the bypass power line to the power storage power conditioner, the DC power is (1 ) When the storage battery is charged, it is supplied to the storage battery, and (2) when the storage battery is not charged, it is supplied to the load .

  According to such a configuration, when the output is suppressed, the power generation power conditioner stops the power supply to the main power line, and the voltage increase of the system is suppressed. Further, when the communication means performs communication, the output suppression information is shared by both the power generation power conditioner and the power storage power conditioner. As a result, it is possible to accept power supply on the power storage power conditioner side, and DC power is supplied from the power generation power conditioner to the power storage power conditioner via the bypass power line. For this reason, in the storage power conditioner, the generated power of the solar power generation system can be effectively utilized when the output is suppressed by supplying the supplied power to the load or storing it in the storage battery.

  In the above multi-power conditioner system, for example, a power generation power conditioner has a DC / DC converter whose input end is connected to a solar cell, and an input end connected to the output end of the DC / DC converter via a power generation side DC power line. And a DC / AC inverter having an output terminal connected to the main power line, and a power generation side control unit for controlling the DC / DC converter and the DC / AC inverter, and the storage power conditioner is connected to the storage battery. One input / output terminal is connected to the other input / output terminal of the bidirectional DC / DC converter and the other input to the main power line through the bidirectional DC / DC converter to which the output terminal is connected and the storage-side DC power line. Bidirectional DC / AC inverter with output terminal connected, bidirectional DC / DC converter and bidirectional DC / AC invar Whether or not the power generation side DC power line and the power storage side DC power line are connected by a bypass power line, and the power suppression condition is satisfied by either the power generation side control unit or the power storage side control unit. If the suppression condition determination unit that determines whether the suppression condition determination unit satisfies the output suppression condition, the above-described output suppression operation can be performed.

For example, the following two methods for determining the output suppression condition by the output suppression condition determination unit are conceivable.
(1) When at least one of the power generation power conditioner and the storage power conditioner is provided with a storage unit that stores in advance an output suppression date and time that requires output suppression, an output suppression date and time and a current date and time stored in the storage unit To determine whether or not the current date and time are included in the output suppression date and time.
(2) When at least one of the communication means included in the power generation power conditioner and the storage power conditioner is capable of receiving an output suppression command from the outside, the output is performed when the communication means receives the output suppression command. It is determined that the suppression condition is satisfied.

  In order to stop the power supply from the power generation conditioner to the main power line when the output is suppressed, the DC / AC inverter is stopped, or it is interposed between the output terminal of the DC / AC inverter and the main power line. Just disconnect the relay.

In addition, for example, the following two configurations are conceivable in which DC power is supplied via the bypass power line only when the output is suppressed.
(1) An input terminal is connected to the power generation side DC power line side and an output terminal is connected to the power storage side DC power line side between the power generation side DC power line and the bypass power line, or between the bypass power line and the power storage side power line. When the bypass DC / DC converter is installed, if the suppression condition determination unit determines that the output suppression condition is satisfied, the bypass DC is controlled under the control of the power generation side control unit or the storage side control unit. The DC / DC converter is operated so that direct-current power is supplied from the power generation power conditioner to the storage power conditioner.
(2) A diode having an anode connected to the power generation side DC power line side and a cathode connected to the power storage side DC power line side between the power generation side DC power line and the bypass power line or between the bypass power line and the power storage side power line When the suppression condition determination unit determines that the output suppression condition is satisfied, the DC / DC converter increases the potential of the power generation side DC power line under the control of the power generation side control unit. A potential adjustment operation and / or a second potential adjustment operation in which the bidirectional DC / DC inverter or the bidirectional DC / AC inverter lowers the potential of the storage-side DC power line under the control of the storage-side control unit is performed. The power generation conditioner is configured to be in a conductive state so that DC power is supplied from the power generation power conditioner to the storage power conditioner.

  ADVANTAGE OF THE INVENTION According to this invention, the separate type multi-power conditioner system which can utilize effectively the electric power generated of a solar power generation system also at the time of output suppression can be provided.

1 is a basic configuration diagram of a multi-power conditioner system according to the present invention. It is a block diagram which shows the detailed structure of the multi-power conditioner system which concerns on 1st Embodiment of this invention. It is a block diagram which shows the detailed structure of the multi-power conditioner system which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the detailed structure of the multi-power conditioner system which concerns on 3rd Embodiment of this invention. It is a figure which shows the modification of DC / DC converter for bypass. It is a block diagram of the conventional integrated multi-power conditioner system.

  Hereinafter, a preferred embodiment of a multi-power conditioner system according to the present invention will be described with reference to the accompanying drawings. In the following, when the system voltage is actually rising or there is a possibility that it is prohibited to sell power, it is referred to as “output suppression”, and other times are referred to as “normal time”. To do.

[Basic configuration and operation]
FIG. 1 shows a basic configuration of a multi-power conditioner system according to the present invention. As shown in the figure, the multi-power conditioner system 10 is mainly composed of a photovoltaic power generation system 20 and a power storage system 30. The solar power generation system 20 includes a solar battery 21 and a power generation power conditioner 22, and the power storage system 30 includes a storage battery 31 and a power storage power conditioner 32.

  The solar power generation system 20 and the power storage system 30 are connected to the main power line L1 branched from the system G via the power line L2 and the power line L3, respectively. When the grid G side is the upstream and the load R side is the downstream, the solar power generation system 20 is connected to the main power line L1 upstream of the power storage system 30.

  The main power line L1 is provided with current transformers CT1 and CT2. The current transformers CT1 and CT2 are for detecting the amount of current flowing through the main power line L1, and an output signal of the current transformer CT1, that is, a signal related to the current amount upstream from the connection point between the main power line L1 and the power line L2, It is input to the generated power conditioner 22. On the other hand, an output signal of the current transformer CT2, that is, a signal related to the current amount upstream from the connection point between the main power line L1 and the power line L3 (downstream from the connection point between the main power line L1 and the power line L2) is input to the power storage power conditioner 32. Is done.

  Moreover, in the multi-power conditioner system 10 which concerns on this invention, the solar power generation system 20 and the electrical storage system 30 are connected by the bypass electric power line LB. The bypass power line LB is configured to be able to supply power only in one direction from the solar power generation system 20 toward the power storage system 30. This will be described in detail later.

  Next, the basic operation of the multi-power conditioner system 10 according to the present invention will be described separately for the operation of the photovoltaic power generation system 20 and the operation of the power storage system 30.

  As indicated by arrows in FIG. 1, the photovoltaic power generation system 20 supplies the power generated by the solar cell 21 to the main power line L1 via the power line L2 or the power storage system 30 via the bypass power line LB. To supply. The electric power supplied to the main power line L1 is consumed by the load R or is reversely flowed (sold) into the grid G. The power supply to the power storage system 30 is performed only when the output is suppressed, and is not performed normally.

  The power storage system 30 charges the storage battery 31 using relatively inexpensive late-night power supplied from the system G and supplies the stored power of the storage battery 31 to the main power line L1 via the power line L3. The power supplied from the power storage system 30 to the main power line L1 is supplied only to the load R and is not sold. This is because the power storage system 30 performs so-called reverse power flow prevention control. In the reverse power flow prevention control, the product of the output voltage of the power storage system 30 (= the voltage of the power line L3) and the current flowing from upstream to downstream detected by the current transformer CT2, that is, the grid active power does not become negative. Thus, the output voltage of the power storage system 30 is controlled.

  The power storage system 30 also charges the storage battery 31 using the power supplied from the solar power generation system 20 when the output is suppressed, or supplies the power to the main power line L1 via the power line L3. That is, in the multi-power conditioner system 10 according to the present invention, even when the output is suppressed, the generated power of the solar cell 21 is supplied to the storage battery 31 or the load R and used effectively. In addition, since the electrical storage system 30 performs reverse power flow prevention control even when the output is suppressed, the power supplied from the solar power generation system 20 is not sold.

[First Embodiment]
With reference to FIG. 2, the structure of 10 A of multi-power conditioner systems which concern on 1st Embodiment of this invention is demonstrated. As shown in the figure, in this embodiment, the solar power generation system 20 is configured by a solar battery 21 and a power generation power conditioner 22A, and the power storage system 30 is configured by a storage battery 31 and a power storage power conditioner 32A.

  The generated power conditioner 22 </ b> A includes a DC / DC converter 23 whose input end is connected to the solar cell 21, and a DC / AC inverter 24 whose input end is connected to the output end of the DC / DC converter 23. . The output end of the DC / DC converter 23 and the input end of the DC / AC inverter 24 are connected via a power generation side DC power line L4. Further, the output terminal of the DC / AC inverter 24 is connected to the main power line L1 via the power line L2, and the photovoltaic power generation system 20 is disconnected from the system G between the DC / AC inverter 24 and the power line L2. Relay RL is interposed.

  The DC / DC converter 23 converts the DC generated power of the solar cell 21 input from the input end into DC power having a predetermined voltage value, and outputs the DC power from the output end. The DC / DC converter 23 is preferably of a type capable of maximum power point tracking control (MPPT control). The DC / AC inverter 24 converts the DC power input from the input end into AC power synchronized with the phase of the system G, and outputs the AC power from the output end.

  The power generation power conditioner 22A includes a power generation side control unit 25 that controls the DC / DC converter 23 and the DC / AC inverter 24 based on a signal relating to the amount of current output from the current transformer CT1, a storage unit 27, and a communication unit 28. And further. Moreover, the power generation side control unit 25 includes a suppression condition determination unit 26A, and the suppression condition determination unit 26A determines whether or not the output is being suppressed.

  The storage unit 27 stores output suppression date and time in advance. Here, the output suppression date and time refers to the date and time when the power sale amount is increased and the system voltage is expected to increase, that is, the period during which output suppression is required. This prediction is made based on past system voltage transitions, sunshine hours, the prevalence of solar power generation systems (multi-power conditioner systems), and the like. For example, during the day of a large holiday in early May, the power generated by the solar cell 21 is relatively large even though the load R requires little power due to going out. It is expected that the voltage will rise. In this case, “May 3, 12: 00-15: 00” is stored in the storage unit 27 as the output suppression date and time.

  The suppression condition determination unit 26A determines whether or not the current date and time are included in the output suppression date and time. When it is determined that the current date and time is included in the output suppression date and time, that is, when the output is suppressed, a signal indicating that output suppression is necessary (hereinafter referred to as “output suppression information”) is transmitted. On the other hand, when it is determined that the current date and time are not included in the output suppression date and time, that is, in the normal time, a signal indicating that output suppression is not necessary is transmitted.

  When the output suppression information is transmitted from the suppression condition determination unit 26A, the information is also transmitted to the power storage power conditioner 32A side via the communication unit 28. As a result, the output suppression information is shared by both the power generation power conditioner 22A and the power storage power conditioner 32A.

  The power generation side control unit 25 at the normal time controls the switching of power semiconductor switching elements such as IGBTs (Insulated Gate Bipolar Transistors) included in the DC / DC converter 23 and the DC / AC inverter 24 in order to perform the above-described operation. To do.

  On the other hand, the power generation side control unit 25 at the time of output suppression stops the control of the DC / AC inverter 24 based on the output suppression information and stops the operation of the DC / AC inverter 24 or Power is supplied from the photovoltaic power generation system 20 to the main power line L1 via the power line L2 by disconnecting the relay RL interposed between the power line L2 and performing these two operations. Stop. The power generation side control unit 25 also controls the bypass DC / DC converter 29 when the output is suppressed, which will be described later.

  The storage power conditioner 32 </ b> A has a bidirectional DC / DC converter 33 having one input / output terminal connected to the storage battery 31, and one input / output terminal connected to the other input / output terminal of the bidirectional DC / DC converter 33. The bidirectional DC / AC inverter 34 is provided. The other input / output terminal of the bidirectional DC / DC converter 33 and one input / output terminal of the bidirectional DC / AC inverter 34 are connected via a storage-side DC power line L5. The other input / output terminal of the bidirectional DC / AC inverter 34 is connected to the main power line L1 through the power line L3.

  When the storage battery 31 is discharged, the bidirectional DC / DC converter 33 converts the storage power of the storage battery 31 input from one input / output terminal into DC power having a predetermined voltage value, and converts the DC power to the other input. Output from the output terminal. The bidirectional DC / AC inverter 34 converts the DC power input from one input / output terminal into AC power synchronized with the phase of the system G, and outputs the AC power from the other input / output terminal.

  When the storage battery 31 is charged, the bidirectional DC / AC inverter 34 converts the AC power of the system G input from the other input / output terminal into DC power having a predetermined voltage value, and converts the DC power into one input power. Output from the output terminal. The bidirectional DC / DC converter 33 converts the DC power input from the other input / output terminal into DC power having an appropriate voltage value, and outputs the DC power from one input / output terminal.

  The power storage power conditioner 32A includes a power storage side control unit 35 that controls the bidirectional DC / DC converter 33 and the bidirectional DC / AC inverter 34 based on a signal related to the amount of current output from the current transformer CT2, a communication unit 38, Is further provided. The power storage side control unit 35 controls opening and closing of power semiconductor switching elements such as IGBTs included in the bidirectional DC / DC converter 33 and the bidirectional DC / AC inverter 34 so as to perform the above-described operation.

  The communication unit 38 can communicate with the communication unit 28 of the generated power conditioner 22A and receives the output suppression information transmitted from the suppression condition determination unit 26A. When the communication unit 38 receives the output suppression information, the power storage side control unit 35 receives the power supplied from the power generation system 20 side as necessary, so that the bidirectional DC / DC converter 33 and the bidirectional DC are received. / Change the control of the AC inverter 34.

  As shown in FIG. 2, the power generation side DC power line L4 of the power generation power conditioner 22A is connected to one end of the bypass power line LB, and the other end of the bypass power line LB is connected to the power storage side DC power line L5 of the power storage power conditioner 32A. Yes. Further, a bypass DC / DC converter having an input terminal connected to the power generation side DC power line L4 side and an output terminal connected to the power storage side DC power line L5 side between the power generation side DC power line L4 and the bypass power line LB. 29 is interposed. The bypass DC / DC converter 29 may be an insulating type or a non-insulating type.

  Like the other converters and inverters, the bypass DC / DC converter 29 includes at least one power semiconductor switching element that is controlled to be opened and closed by the power generation side control unit 25.

  In normal time, the bypass DC / DC converter 29 is stopped under the control of the power generation side control unit 25. Therefore, the DC power of the power generation side DC power line L4 is not supplied to the power storage side DC power line L5 via the bypass power line LB. On the other hand, when the output is suppressed, the bypass DC / DC converter 29 is brought into an operating state under the control of the power generation side control unit 25. Therefore, the DC power of the power generation side DC power line L4 is converted into DC power having a predetermined voltage value and then supplied to the power storage side DC power line L5.

  When the storage battery 31 is being charged, the DC power supplied to the storage-side DC power line L5 is supplied to the storage battery 31 via the bidirectional DC / DC converter 33. Thereby, the generated power of the solar cell 21 can be charged to the storage battery 31, and this generated power can be used effectively. On the other hand, in other cases, the DC power supplied to the storage-side DC power line L5 is supplied to the load R via the bidirectional DC / AC inverter 34, the power line L3, and the backbone power line L1. Thereby, the electric power supply from the system | strain G to the load R, ie, the quantity of the electric power purchased from an electric power company, can be reduced, and an electricity bill can be reduced.

[Second Embodiment]
As shown in FIG. 3, the multi-power conditioner system 10B according to the second embodiment of the present invention is that the power generation side control unit 25 has a suppression condition determination unit 26B, and the storage unit in the power generation power conditioner 22B. 27 is different from the first embodiment in that the communication unit 28 is connected to a network NT such as the Internet, but the other points are common.

  The communication unit 28 can receive various commands via the network NT. The network NT is also connected to a system voltage monitoring terminal (not shown) installed on the power company side. The system voltage monitoring terminal monitors the system voltage for each region, for example. And when a system voltage rises so that output suppression needs to be performed, an output suppression command is transmitted to communication part 28 of multi-power conditioner system 10B installed in the area concerned. The communication unit 28 that has received the instruction transmits a signal to that effect to the suppression condition determination unit 26B. And the suppression condition determination part 26B transmits output suppression information.

[Third Embodiment]
As shown in FIG. 4, in the multi-power conditioner system 10C according to the third embodiment of the present invention, the suppression condition determination unit 36 is provided in the storage-side control unit 35, and is stored in the storage power conditioner 32C. The second embodiment is different from the first embodiment in that the unit 37 and the bypass DC / DC converter 39 are provided, but the other points are common.

  The suppression condition determination unit 36 refers to the output suppression date and time stored in the storage unit 37 to determine whether or not the output is being suppressed, but based on an external command input via the communication unit 38. The same determination may be performed. When the output is suppressed, the suppression condition determination unit 36 transmits output suppression information. Along with this, the power storage side control unit 35 sets the bypass DC / DC converter 39 in an operating state and transmits output suppression information to the power generation side control unit 25 via the communication unit 38 and the communication unit 28. As a result, the output suppression information is shared by both the power generation power conditioner 22C and the power storage power conditioner 32C, and the power generation side control unit 25 stops the DC / AC inverter 24 or disconnects the relay RL.

  The preferred embodiments of the multi-power conditioner system according to the present invention have been described above, but the present invention is not limited to these configurations.

  For example, in each of the above embodiments, the bypass DC / DC converter 29 (39) is interposed between the power generation side DC power line L4 and the bypass power line LB or between the bypass power line LB and the power storage side DC power line L5. As shown in FIGS. 5A and 5B, the bypass DC / DC converter 29 (39) can be replaced with a simple diode. However, in such a configuration, when the output is suppressed, the power generation side control unit 25 controls the DC / DC converter 23 to increase the potential of the power generation side DC power line L4 and / or the power storage. The side control unit 35 needs to perform a second potential adjustment operation for controlling the bidirectional DC / DC converter 33 or the bidirectional DC / AC inverter 34 to lower the potential of the storage-side DC power line L5. That is, it is necessary to adjust the magnitude relationship between the potential of the power generation side DC power line L4 and the potential of the power storage side DC power line L5 so that the diode is in a conductive state only when the output is suppressed.

10, 10A, 10B, 10C Multi-power conditioner system 20 Solar power generation system 21 Solar cells 22, 22A, 22B, 22C Power generation power conditioner 23 DC / DC converter 24 DC / AC inverter 25 Power generation side control unit 26A, 26B Suppression Condition determination unit 27 Storage unit 28 Communication unit 29 Bypass DC / DC converter 30 Power storage system 31 Storage batteries 32, 32A, 32C Storage power conditioner 33 Bidirectional DC / DC converter 34 Bidirectional DC / AC inverter 35 Power storage side control unit 36 Suppression condition determination unit 37 Storage unit 38 Communication unit 39 Bypass DC / DC converter G System L1 Core power line L4 Power generation side DC power line L5 Power storage side DC power line LB Bypass power line R Load

Claims (6)

  1. A multi-power conditioner system including a photovoltaic power generation system and a power storage system connected to power lines branched from a main power line connecting a system and a load,
    The solar power generation system includes a solar cell, and a power generation power conditioner that supplies power from the solar cell to the main power line,
    The power storage system supplies and receives power to the storage battery and the storage battery, and stores power condition that supplies power to the load while preventing reverse power flow to the grid by reverse power flow prevention control. Have
    The power generation power conditioner and the power storage power conditioner include communication means capable of communicating with each other, and are connected by a bypass power line capable of supplying DC power from the power generation power conditioner to the power storage power conditioner,
    When the output is suppressed to suppress the voltage rise of the system, output suppression information is shared between the power generation power conditioner and the power storage power conditioner through communication between the communication means, and the output suppression operation is performed from the power generation power conditioner. wherein with the power supply to the trunk power line is stopped, the DC power is supplied from the power generating power conditioner through the bypass power line to said power storage power conditioner,
    The DC power is (1) supplied to the storage battery when the storage battery is charged, and (2) supplied to the load when the storage battery is not charged. Multi-power conditioner system featuring
  2. The power generation conditioner includes a DC / DC converter having an input terminal connected to the solar cell, an input terminal connected to the output terminal of the DC / DC converter via a power generation side DC power line, and the main power line. A DC / AC inverter to which an output terminal is connected; and a power generation side controller that controls the DC / DC converter and the DC / AC inverter;
    The storage power conditioner includes a bidirectional DC / DC converter having one input / output end connected to the storage battery and one input / output end of the bidirectional DC / DC converter via a storage-side DC power line. A bidirectional DC / AC inverter having an input / output terminal connected and the other input / output terminal connected to the main power line, and a storage-side control for controlling the bidirectional DC / DC converter and the bidirectional DC / AC inverter And further comprising
    The power generation side DC power line and the electricity storage side DC power line are connected by the bypass power line,
    When either of the power generation side control unit and the power storage side control unit is provided with a suppression condition determination unit that determines whether or not an output suppression condition is satisfied, and the suppression condition determination unit determines that the output suppression condition is satisfied The multi-power conditioner system according to claim 1, wherein the output suppression operation is executed.
  3. At least one of the power generation power conditioner and the power storage power conditioner is provided with a storage unit that stores in advance the output suppression date and time that requires the output suppression,
    The suppression condition determination unit compares the output suppression date and time stored in the storage unit with the current date and time, and whether or not the output suppression condition is satisfied depending on whether or not the output suppression date and time includes the current date and time. The multi-power conditioner system according to claim 2, wherein:
  4. At least one of the communication means of the power generation power conditioner and the power storage power conditioner is capable of receiving an output suppression command from the outside,
    The multi-power conditioner system according to claim 2, wherein the suppression condition determination unit determines that the output suppression condition is satisfied when the communication unit receives the output suppression command.
  5.   When the output is suppressed, the power generation side control unit stops the DC / AC inverter or disconnects a relay interposed between the output terminal of the DC / AC inverter and the main power line. The multi-power conditioner system according to any one of claims 2 to 4.
  6. An input end is connected to the power generation side DC power line side and an output end to the power storage side DC power line side between the power generation side DC power line and the bypass power line, or between the bypass power line and the power storage side power line. Is connected to the bypass DC / DC converter,
    When the suppression condition determination unit determines that the output suppression condition is satisfied, the bypass DC / DC converter operates under the control of the power generation side control unit or the power storage side control unit, and the power generation power condition is 6. The multi-power conditioner system according to claim 2, wherein DC power is supplied from a power source to the power storage power conditioner.
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