JP5596102B2 - Grid connection device for power purchase system capable of responding to abnormal situation of power system at the time of disaster, and method for emergency output of power at the time of emergency evacuation such as disaster using the grid interconnection device for power purchase system - Google Patents

Description

  The present invention relates to a grid interconnection device for a power purchase system that can cope with an abnormal situation of a power system caused by a disaster or the like, and uses the generated power of the grid interconnection device for the power purchase system to The present invention relates to an emergency output method for avoiding abnormal situations.

Each term used in the present invention is defined as follows.
The “system” means an electric power system for supplying electric power, and refers to an integrated system from power generation to power distribution for an electric power company to supply electric power to consumers of electric power. Further, the term “specific output system” may be used to indicate an electric power system from a specific power supply source to a specific power demand destination.
“Disasters” include human disasters (including wars, civil wars, acts of terrorism), natural disasters (including earthquakes, heavy rains, lightning strikes, tsunamis, tornadoes, etc.), accidents (including railway and traffic accidents, etc.), and power supply An event that causes an abnormal condition over a long period of time in the system. Moreover, when an abnormal state for a long time occurs in the power supply system due to such an abnormal situation, it is referred to as “at the time of disaster”.
The “power system abnormal situation” refers to a situation in which a serious abnormality occurs in the power system due to an event caused by a disaster, for example, a critical situation such as causing a life crisis. It does not include simple power outages, but it includes large-scale power outages such as power outages throughout the region.
“Emergency evacuation use” means that the power generated by the grid connection device for power purchase according to the present invention is used as a power system in order to obtain necessary power for maintaining public interests or maintaining lives in the event of a disaster. Means emergency evacuation in different systems.
"Power purchase grid interconnection device" is used for a system that purchases the generated power by supplying the power obtained by solar power generation or wind power generation to the existing power grid A grid interconnection device. A grid interconnection device used in a system that purchases the entire amount of generated electric power is referred to as a “full grid purchase grid interconnection device”.
There are two types of power purchase systems: a “surplus power purchase system” and a “total purchase system”. The “surplus power purchase system” is a system stipulated in the “Act on the Use of Non-Fossil Energy Sources and Effective Use of Petrified Energy Raw Materials by Energy Suppliers (November 1, 2009)” In this system, electric power companies purchase surplus power generated at homes and offices at a fixed price. The “total fixed purchase system” or “total purchase system” is a system stipulated by the Act on Special Measures concerning Renewable Energy Electricity Procurement by Electric Power Companies (August 26, 2011). It is a system that requires electric power companies to purchase all the power generated by renewable energy sources such as solar, wind, hydropower, geothermal, and biomass at a fixed price.
The present invention is effective when applied to a system of a power generation company in a power purchase system. In particular, it functions effectively under the total purchase system, but is also effective under the surplus power purchase system.

  In recent years, with increasing awareness of environmental conservation, international efforts to reduce CO2 to prevent global warming and the use of renewable energy sources such as solar power generation systems, wind power generation systems, and geothermal power generation have expanded. I am doing. A typical example is a solar power generation system. The solar light energy is converted into a direct current by the solar cell module, and this direct current is converted into alternating current power by the inverter of the power conditioner and used. At that time, the voltage is boosted in accordance with the voltage (output) to be used, and a low-voltage AC output is provided via an insulation and step-up transformer so that a DC component from the inverter does not flow into the system. Such power conditioners are already manufactured and sold by many manufacturers.

  Under the circumstances as described above, in recent years, systems for installing solar panels even in ordinary households to generate power and selling surplus power to electric power companies are increasing. In such a conventional surplus power purchase system, the AC power obtained thereby is linked to the low-voltage system (200V to 400V) of each home or factory, and the power company purchases surplus power exceeding the amount of self-consumption. It is a system.

In such a surplus power purchase system, the idea of effectively using the generated surplus power is already known in patent literature.
Patent Document 1 (Japanese Patent Laid-Open No. 2011-61970) divides the current power system into a plurality of independent power systems and enables them to be interconnected and stable in order to enable mass introduction of renewable energy. It is an object to construct a power system that can be used in the future and its operation means. This is configured by a multi-terminal type asynchronous interconnection device characterized in that a plurality of asynchronous power systems including the main power system are connected and the power control is performed so that the sum of the inflow power and the output power is zero. An asynchronous interconnection network system between a plurality of power grids, and a power network synchronous network system configured by a power equipment control terminal device having means for performing power control of a power equipment installed in an independent power grid. By connecting and integrating power control and communication control, a power network system is constructed that enables power interchange between different power system power devices and simultaneous and asynchronous power interchange between multiple power systems.

  Patent Document 2 (Japanese Patent Laid-Open No. 2011-182641) has the same problem as Patent Document 1, and connects a plurality of asynchronous power systems including a main power system, and the sum of inflow power and output power Power control of power equipment installed in a self-supporting power system, and an asynchronous interconnection network system between multiple power systems characterized by multi-terminal asynchronous interconnection devices characterized by controlling power to zero By connecting an in-power system synchronous network system composed of power device control terminal devices having means for performing power integration and integrating power control and communication control, power interchange between different power system power devices and multiple power systems We are building a power network system that enables simultaneous and asynchronous power interchange.

  Patent Document 3 (Japanese Patent Application Laid-Open No. 2012-10530) has a problem of suppressing the possibility of a chain power failure due to instability of a system due to a large amount of fluctuation of a natural energy power source. The power system is subdivided and an asynchronous power interchangeable device is developed between them, and the power is interchanged with the destination through a plurality of routes like the Internet. By connecting multiple power semiconductor device configurations that can convert power bidirectionally, a multi-terminal power conversion device that distributes and distributes power is devised, and asynchronous power connection of subdivided power systems is performed, thereby enabling chain power failure Suppress. By adding an information processing address, power can be accommodated to a target power system like the Internet. As a result, the power conversion related information and the transaction related information are associated with each other so that power transactions and transactions of derivative products can be performed.

  Patent Document 4 (WO2008 / 117392) aims to provide a power system that can stand on its own without relying on a conventional power system, and includes one or more power generation devices, one or more power storage devices, and 1 A self-sustained distributed type in which a plurality of power consumers including one or a plurality of power consuming devices and a power supply and demand control device are interconnected directly or indirectly, and each power supplier and demand can accommodate excess and deficient power. In the power system, each power demand control device determines whether or not a power shortage occurs in each power consumer, or whether or not a power surplus occurs. An invention has been disclosed in which electric power is received from a power supplier and demander, and when power surplus occurs in the power supplier and demander, the power is supplied to another power supplier and demander.

  Patent Document 5 (Japanese Patent Laid-Open No. 2012-60761) aims to appropriately trade power within a region even when the reverse power flow acceptance status varies from region to region. The power transmission / reception between the solar cell generated power, the power stored or discharged by the storage battery, the power received or transmitted via the commercial low voltage line, and the other residential or regional facilities via the shared low voltage line An invention is disclosed that includes a switching unit that switches a flow of power to be received and power supplied to a power load. The transaction device determines and switches the flow of power in the home power distributor based on the measurement results of the generated power of the solar cell measured by the home power distributor, the stored or stored power of the storage battery, and the power consumption of the power load. And the transaction rate of power is determined according to the flow of power. In addition, an invention is disclosed in which the transaction apparatus stores the surplus power in the local storage battery when there is surplus power in the area, and transmits the stored power of the local storage battery to the shared low voltage line when the surplus power decreases.

  Patent Document 6 (Japanese Patent Application Laid-Open No. 2011-101532) can accommodate the amount of electric power by suppressing the unclear ratio between the amount of electric power to be interchanged between electric power consumers and the amount of commercial AC power. The issue is to provide a power interchange system. In this power interchange system, the amount of solar power generated by solar cells is interchanged between housings in an apartment house. Each house receives supply of commercial AC power through the same power supply system, and also receives power supply from solar cells. The amount of power supplied to each house is managed by a power management device. The power management apparatus grasps the surplus power amount in one house and the required power amount of another house, and supplies the surplus power amount of one house to another house through the power supply system.

  Patent Document 7 (Japanese Patent Laid-Open No. 2011-101533) aims to provide a power distribution system that can contribute to the promotion of energy saving awareness, and generates electricity using solar cells and oil that supply power generated by sunlight. In a power supply system capable of driving a DC device and an AC device with power supplied from at least one of the commercial AC power supplies that supply the power, the power of the solar cell and the commercial AC power source when the DC device and the AC device are driven An invention provided with a light emitting element for notifying a power source in use as a supply source is disclosed.

  However, last year, the “Special Measures Law concerning Renewable Energy Electricity Procurement by Electric Power Companies” was enacted (August 26, 2011). According to this law, electricity companies are required to purchase electricity generated using renewable energy sources (solar, wind, small and medium hydropower, geothermal, and biomass) for a certain period of time and at a fixed price. Yes, starting from July 1st of this year (2012). These are reported by the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry in Non-Patent Document 1 and others on the Internet.

Under the total purchase system such as solar power generation, it is required to separate the power generation system from the low voltage system (200V to 400V) of the consumer and directly connect to the power system (6.6kV). Therefore, under this new system, it is necessary to install a power receiving / transforming facility equipped with a transformer, a circuit breaker, and relays that boost the voltage to the grid voltage of the power company. Therefore, the present applicant has already commercialized a package “BUY Denki Gateway (Hitachi Industrial Equipment Systems Co., Ltd.)” in which these and the power conditioner are integrated. This product achieves low loss and high efficiency by combining a high-efficiency power conditioner with an amorphous transformer with low no-load loss specialized for this application, making it a social infrastructure system under the new system. Manufactured and sold as a contributing product.
In this regard, the applicant has already filed a patent application (Japanese Patent Application No. 2012-001262). The present invention further improves this.

The present applicant has already applied for Patent Document 8 (Japanese Patent Laid-Open No. 2010-273489) as a power conditioner that has been miniaturized. The first object of the present invention is to provide a power conditioner that can improve partial load efficiency and improve system conversion efficiency in a photovoltaic power generation system in a power conditioner equipped with a transformer. A second object of the present invention is to provide a power conditioner that can be further reduced in size in a power conditioner configured by putting a transformer and an inverter in the same casing. Therefore, in one embodiment, in a power conditioner that includes a power conversion device that converts DC power from a solar cell to generate AC power, and that connects the power of the solar cell to a commercial power system power supply, An amorphous transformer that boosts the power generated by the power conversion circuit is provided between the commercial power systems.
Non-Patent Document 2 also discloses a power conditioner.

JP 2011-61970 A JP 2011-182641 A JP 2012-10530 A WO2008 / 117392 JP 2012-60761 A JP 2011-101532 A JP 2011-101533 A JP 2010-273489 A

http://www.enecho.meti.go.jp/saiene/kaitori/2011kaitori_gaiyo2.pdf Renewable energy feed-in tariff system https://sanyodenki.e-manager.jp/book-view/view/bookNum/97/ Power conditioner for solar power generation system with peak cut function SANUPS PMC-TD

  In this way, the surplus power purchase system has been promoted by local governments for a long time, and the total power purchase system, which is a new purchase system that has a different purpose from the surplus power purchase system that has been implemented in the past, was released on July 1, 2012. Effective from the day, administrative guidance is also being promoted. In this way, whether it is a surplus power purchase system or a full quantity purchase system, the power generated by a system different from the system of the power company is distributed in the system. However, the distribution is only between the systems of specific power generation companies and electric power companies. It is not a system that freely allows direct supply of surplus power from a specific power generation company that is a consumer of an electric power company to other consumers. Furthermore, in the total amount purchase system, in particular, the total amount of generated power is purchased directly connected to the high-voltage or special high-voltage system of the electric power company, not to the interconnection between the low-voltage systems of each home or factory. Therefore, it is considered that the future full purchase system will be introduced as a system that does not allow self-consumption of power generated by a solar power generation system or the like.

  On the other hand, considering abnormal weather in recent years, it is necessary to consider how to deal with disasters (for example, typhoons, tornadoes, earthquakes, tsunami damage, large-scale power outages, etc.). In other words, if the power supply from the power company is stopped for a long period of time, the power generated by your own solar power generation system or other equipment will be used for emergency evacuation by yourself or in a facility such as a hospital. The need to use it for is fully anticipated. Such actions are socially effective countermeasures for emergency evacuation under both the surplus power purchase system and the full quantity purchase system, and can only be used for emergency evacuation. In addition, there is a need to supply a system that can safely supply power even as a device that can handle high voltage.

  In particular, for public facilities such as hospitals, it seems highly desirable to be able to supply electric power generated by facilities such as the solar power generation system in the event of a disaster. In hospitals and the like, it is essential to supply power to related equipment during surgery, and delays in surgery are not allowed. In addition, a life support device, a dialysis device, a refrigerated storage device such as a vaccine, and the like are provided, and the continuous power supply to these devices is strongly related to the maintenance of human life. Of course, hospitals and the like often have a private power generator. However, considering the storage and supply of fuel, it is related to the degree of disaster and the time of emergency, but it does not always provide enough power for its own power generation facilities, and it has other power generation facilities. It is an effective means to supply generated power from a separate route.

  In addition, not only in hospitals and other organizations related to maintaining human life, but in the case of disasters, from the viewpoint of public and public interest, for example, in facilities such as water supply facilities and skyscraper elevators, rely on power from electric power companies. It is very important not only to have two facilities that can supply power separately from the power company.

  However, such an emergency evacuation demand for electric power usually does not feel necessary. Therefore, in the present invention, in the normal time, it is a facility for the power company system as a device corresponding to the power purchase system, but in the event of a disaster, the generated power can be safely separated by a predetermined configuration. It is an object of the present invention to provide equipment that can be connected to a low-pressure system. Furthermore, this invention makes it a subject to be able to perform safely also in the use of those construction methods or facilities, when connecting to another system.

  In this regard, a power conditioner that can supply power even during a power failure in a self-sustained operation is already known in Non-Patent Document 2. However, as described in this document, “a general grid-connected photovoltaic power generation system cannot use electricity when commercial power is interrupted” solves the problem of the present invention. It is not possible.

The grid connection device for power purchase of the present invention,
A power conditioner that converts DC power from a renewable energy source such as solar power generation or wind power generation into AC power, and a step-up transformer that converts AC power output from the power conditioner into high voltage power, A grid connection device for power purchase that outputs high voltage power from the step-up transformer to a high voltage power system,
In order to output the output from the grid connection device for power purchase to a connection destination of a system different from the high-voltage power system, a switch for switching the connection destination is provided.

Furthermore, in the grid interconnection device for power purchase of the present invention,
The switch is provided between the power conditioner and the step-up transformer, and the switching operation of the switch is limited.

Furthermore, in the grid interconnection device for power purchase of the present invention,
The output from the switch is branched from the output system so that it can be output to a plurality of output destinations.

Furthermore, in the grid interconnection device for power purchase of the present invention,
Each of the branched output systems includes a blocking unit, and connection / cutoff of the blocking unit is controlled by control of the output blocking control unit.

Furthermore, in the grid interconnection device for power purchase of the present invention,
The power conditioner, the step-up transformer, and the switch are arranged in the same casing.

In addition, the grid connection device for power purchase of the present invention,
A power conditioner that converts DC power from a renewable energy source such as solar power generation or wind power generation into AC power, and a step-up transformer that converts AC power output from the power conditioner into high voltage power, The power conditioner and the step-up transformer are arranged in the same housing, and are a power purchase system interconnection device that outputs high-voltage power from the step-up transformer to a high-voltage power system,
Provided in the same housing are a connection terminal for outputting the output from the grid connection device for power purchase to a system different from the high-voltage power system, and a switch for switching the connection destination of the output from the power conditioner. And
The switch is configured to switch the connection to the connection terminal that outputs the output from the power conditioner to the step-up transformer or the separate system, and the switching operation of the switch is limited. It is characterized by.

Furthermore, the grid connection device for power purchase of the present invention,
The switching device in which the switching operation is restricted includes a security mechanism unit that outputs a switching signal to the switching device,
A terminal box containing a connection terminal that outputs to the other system is provided, and the terminal box has a sealing structure covered with a destructible sealing cover. When the emergency evacuation such as a disaster, the sealing cover is opened. Connection with the connection terminal to the other system is possible, and an input unit for inputting the password to the security mechanism unit is provided.

Furthermore, the grid connection device for power purchase of the present invention is provided with a display device that displays the operating state,
The display mode displayed on the display device is
A safety work mode for displaying that the connection work with the connection terminal to the different system can be safely done; and
It has another system output mode which displays that the electric power is output with respect to another system from the connection terminal to said another system.

The output method to another system of power using the grid interconnection device for power purchase of the present invention,
A power conditioner that converts DC power from a renewable energy source such as solar power generation or wind power generation into AC power, and a step-up transformer that converts AC power output from the power conditioner into high voltage power, The power conditioner and the step-up transformer are arranged in the same enclosure, and a method for outputting power to another system using a power purchase system interconnection device that outputs high-voltage power from the step-up transformer to a high-voltage power system Because
A connection terminal that outputs the output from the grid connection device for power purchase to a system different from the high-voltage power system, and a switch that switches a connection destination of the output from the power conditioner, the switch is The power switching system interconnection device is configured to switch the connection from an output from the power conditioner to a connection terminal that outputs to the step-up transformer or the separate system, and the power purchase system interconnection device outputs a switching signal to the switch Part
The security mechanism performs password authentication processing consisting of letters or numbers input by an operator, and if it is authenticated as a legitimate operator, outputs a switching permission command signal,
After the switching permission command signal is output, the switch can switch the connection from the connection to the high-voltage power system to the connection terminal that outputs the connection from the high-voltage power system to the connection terminal of the output from the power conditioner. And

Furthermore, the output method to another system of power using the grid interconnection device for power purchase of the present invention,
In the display device that displays the operating state of the grid connection device for power purchase,
When the ID / password entered by a legitimate operator is authenticated and the switch detects that the output from the power conditioner has not switched the connection to the connection terminal to the other system Displays the safety work mode,
When the switch detects that the output from the power conditioner is switching the connection to the connection terminal to the other system, and it detects that the power is output from the connection terminal. The system output mode is displayed.

The grid connection device for power purchase of the present invention is particularly effective when applied to a total purchase system, and converts DC power from a renewable energy source such as solar power generation or wind power generation into AC power. A power conditioner, and a step-up transformer that converts AC power output from the power conditioner into high-voltage power, and the power conditioner and the step-up transformer are arranged in the same casing, and from the step-up transformer A high-voltage power grid interconnection device that outputs high-voltage power to a high-voltage power grid,
Provided in the same housing are a connection terminal for outputting the output from the total quantity purchase system interconnection device to a system different from the high-voltage power system, and a switch for switching the connection destination of the output from the power conditioner. And
The switch is configured to switch connection to a connection terminal that outputs the output from the power conditioner to the step-up transformer or the separate system, and the switching operation of the switch is limited. A security mechanism that outputs a switching signal to the switch is provided.
In addition, a terminal box is provided that encloses the connection terminals that are output to the separate system, and the terminal box has a sealing structure covered with a destructible sealing cover, and the sealing cover is destroyed during an emergency evacuation such as a disaster. Thus, it is possible to connect to a connection terminal to the other system, and an input unit for inputting the password to the security mechanism unit is provided.

The emergency output method of power at the time of emergency evacuation such as a disaster using the grid connection device for power purchase of the present invention is particularly effective when applied to the total purchase system,
A power conditioner that converts DC power from a renewable energy source such as solar power generation or wind power generation into AC power, and a step-up transformer that converts AC power output from the power conditioner into high voltage power, The power conditioner and the step-up transformer are arranged in the same housing, and the electric power at the time of emergency evacuation such as a disaster using a total quantity purchase system interconnection device that outputs the high-voltage power from the step-up transformer to the high-voltage power system Emergency output method,
Provided with a connection terminal for outputting the output from the total amount purchase grid interconnection device to a system different from the high-voltage power system, and a switch for switching the connection destination of the output from the power conditioner, the switch, The system is configured to switch the connection from the output from the power conditioner to the step-up transformer or a connection terminal that outputs to the separate system, and the total quantity purchase system interconnection device outputs a switching signal to the switch. Part
The security mechanism performs password authentication processing consisting of letters or numbers input by an operator, and if it is authenticated as a legitimate operator, outputs a switching permission command signal,
After the output of the switching permission command signal, the switch can be switched from the connection destination of the output from the power conditioner to the connection terminal outputting from the connection to the high-voltage power system to the connection terminal. It is characterized by providing.

  According to the present invention, it is a device that is used as a general grid connection device for power purchase in normal times, but has a configuration capable of switching the connection of the output power to a system other than the power system in an emergency evacuation during a disaster. Because it is equipped, it can cope with an abnormal situation at the time of a disaster.

In addition, when switching connections in the event of a disaster, construction, operation, operation, and the like for the power purchase grid interconnection device can be achieved without fail.
In addition, when operating as a facility that supports normal power purchase, a power factor of 1 is achieved at the time of receiving power, and even when power is output to a system other than the power system in the event of a disaster such as an earthquake disaster, The power factor of 1 can be realized.

It is a block diagram which shows the structure of the Example of the grid connection apparatus for electric power purchase of this invention. It is a flowchart of the control in the case of outputting to another system in the Example of the grid connection apparatus for power purchase of this invention. It is an implementation figure of apparatus arrangement | positioning of the Example of the grid connection apparatus for electric power purchase of this invention. It is a figure which shows the example of a display of the display apparatus in the Example of the grid connection apparatus for electric power purchase of this invention. It is a flowchart explaining the display of the display apparatus in the Example of the grid connection apparatus for electric power purchase of this invention. It is a figure which shows another example of a display of the display apparatus in the Example of the grid connection apparatus for electric power purchase of this invention. It is a block diagram of adjustment of the electric power phase of the power conditioner in the Example of the grid connection apparatus for power purchase of this invention. It is a block diagram explaining the multiple output structure of the Example of this invention, and its interruption | blocking structure. The relationship with FIG. 1 is shown in the figure. It is a flowchart explaining the 1st pattern of the multiple output function of the Example of this invention, and its interruption | blocking function. It is another flowchart explaining the 2nd pattern of the multiple output function of the Example of this invention, and its interruption | blocking function.

  In order to solve the above problems, the present invention provides a connection terminal for another system that is newly connected to another system, separately from a terminal that connects the generated power of solar power generation or wind power generation to a high-voltage power system of an electric power company. Shall be provided. There may be one or more connection terminals for different systems. As will be described in detail in the following embodiment, when a plurality of connection terminals for different systems are provided, it is necessary to consider ON / OFF of power supply to each connection terminal.

  In addition, the connection terminal for another system has a sealed structure so that it cannot be connected to the terminal during normal use from the viewpoint of safety. The sealing structure is, for example, covered with a sealing cover that performs sealing in order to suppress the free use of everyone and limit the use to a predetermined qualified person. Further, the sealing cover can be physically broken to enable connection to a connection terminal for another system. Further, the sealing cover may be configured to be opened only when a specific condition is satisfied, or may be configured to be opened only by a specific worker.

  Furthermore, this invention can provide the switch which switches a connection so that electric power is output from the connection terminal for another system | strains. This switch can be configured so that the connection is switched only when a specific condition is satisfied.

  Moreover, you may comprise this invention so that the display apparatus which notifies an operator that connection construction can be performed safely is provided with respect to the connection terminal for another systems.

  Further, the present invention is configured to provide two modes of an operation mode in which the operation is synchronized with the grid output phase at the time of power purchase and an operation mode in which the operation is performed independently (asynchronous) during private consumption, and the two operation modes are switched. You can also.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration example of an embodiment of the power purchase grid interconnection device of the present invention, and the same parts as those in FIGS. Hereinafter, the description of the embodiments does not limit the technical scope of the invention, and design modifications that can be easily made by those skilled in the art are included in the present invention within the scope of the inventive idea.

  In the grid connection device for power purchase shown in FIG. 1, the DC output power generated by the solar cell modules 1, 1 is converted into AC power by the inverter 3 in the power conditioner 2, and the waveform is passed through the reactor 4. Is converted to AC power with a sine wave. This AC power is transmitted to the step-up transformer 6 via the conductor (electric wire) 5. The step-up transformer 6 applies low-voltage (600 V or less, for example, 200 V or less) AC power output from the power conditioner 2 to a high voltage (600 to 7000 V or less, for example, 6.6 KV for AC) or extra high voltage (7000 V for AC). It is a transformer that converts to the above, and also plays the role of an isolation transformer.

  The electric power boosted to a high voltage or extra high voltage by the step-up transformer 6 takes out a power amount signal from the power line 19 via a vacuum circuit breaker (VCB) 7 and a disconnector (DS) 8. (VCT) 9 and a column top air switch (PAS) 10 are connected to the power system 11. A vacuum circuit breaker (VCB) 7 protects those connected devices by interrupting the step-up transformer 6 from the high-voltage system in the event of a short circuit or ground fault in the high-voltage system. A power meter 12 is connected to the power supply / demand meter transformer 9, and the amount of power transmitted to the power system 11 (the amount of power sold) is measured. As described above, in the system having the above-described configuration, the power conditioner 2 constitutes a low-voltage system (LS) device, which includes a step-up transformer 6 to a power supply / demand meter transformer 9 and a watt-hour meter 12. The apparatus of the high voltage | pressure system (HS) is comprised.

  In the present embodiment shown in FIG. 1, the low-voltage system (LS) and high-voltage system (HS) devices are housed in the same housing 13. That is, in the housing 13, the power conditioner 2, the step-up transformer 6, the vacuum circuit breaker 7, the disconnector 8, the power transformer 9 for power supply and demand, and the wattmeter 12 are housed. In an apparatus having a transformer capacity up to 300 kVA, an air load switch may be used as a load switch for protecting and switching the line instead of the vacuum circuit breaker 7 and the disconnecting switch 8. The load switch protects the line with a built-in fuse and serves as a vacuum circuit breaker 7 and a disconnecting switch 8. Note that the power supply / demand meter transformer 9 and the watt-hour meter 12 are not necessarily housed in the housing 13.

  The embodiment of the present invention relates to the grid interconnection device for power purchase as described above, and outputs the output power from the power conditioner 2 to a system separate from the power system in an emergency evacuation during a disaster such as an earthquake disaster. The present invention relates to an apparatus and a method that make it possible. Specifically, as shown in FIG. 1, a connection terminal 15 is provided between the low-voltage system (LS) and the high-voltage system (HS) of the grid connection device for power purchase so that power can be output in the event of a disaster. It is.

  As already described, during normal use, the power from the power conditioner 2 is connected to the step-up transformer 6 so that the power from the power conditioner 2 is boosted by the step-up transformer 6. This is required in the power purchase system interconnection device for power purchase. In the embodiment of the present invention, in the grid connection device for power purchase applied to the power purchase system as described above, by providing the switch 14 having a special configuration, it is urgent at the time of disaster such as an earthquake disaster. As an evacuation, the output power from the power conditioner 2 can be safely output not only to its own use but also to another system 18 different from the power system.

  That is, in the event of a disaster, the connection of the switch 14 can be switched in an emergency evacuation manner using a safe and simple method, and the output power output from the power conditioner 2 is different from the power system 11 in addition to the self-use. This allows safe output to another system 18. In addition, since the grid interconnection apparatus according to the embodiment of the present invention is a facility that can be used even in the total quantity purchase system, it is assumed that power to the separate system 18 is not output in normal times. For this purpose, the grid interconnection device for power purchase according to the embodiment of the present invention must output power to the separate grid 18 in an emergency evacuation only in the event of a disaster, for the purpose of the total fixed purchase system. Therefore, the application of the present invention is particularly effective.

  Therefore, in the embodiment of the present invention, emergency evacuation measures such as during a disaster can be safely achieved by the following two specific configurations.

  First, in the first embodiment, the switch 14 provided with the connection terminal 15 to the separate system 18 is configured by a sealing structure that restricts free use by everyone. In this way, the switch 14 is sealed, and is usually configured so that the connection terminal 15 cannot be physically connected to the other system 18. For example, although not particularly illustrated, this is possible by covering the switching lever of the switch 14 with a sealing cover. Since this seal cover is not intended to be impossible to use, it may be transparent so that the switching lever of the switch 14 is visible, but it is opaque and not visually visible. It may be one that restricts free use. In an emergency evacuation such as a disaster, a technician having electric construction qualification destroys the sealing cover and exposes the switching lever of the switch 14 to enable connection work with another system 18. You may do it. The box 16 in which the switch 14 shown in FIG. 1 is housed may have a locking structure that can be opened and closed only during an emergency evacuation such as a disaster. In that case, it is necessary to make it possible for a technician having a qualification for electrical work to release the lock.

  As described above, “the destruction of the sealing cover and enabling the connection work” is intended to allow the connection to the separate system 18 for emergency evacuation in the event of a disaster, etc. Since it is possible to use a technician having a construction qualification, it is intended to be shown explicitly from the exterior as the case 13 of the grid connection device for power purchase according to the embodiment of the present invention. is there. In addition, as with a seal cover such as a fire alarm, there is also an aim to make the operator psychologically and implicitly aware that it is an emergency evacuation action in the event of a disaster. In particular, if the equipment is compatible with the full-volume purchase system, it is allowed to be used outside of the electric power system as an emergency evacuation for disasters, etc. is there. Again, when using the present invention as a grid connection device for power purchase, it is necessary to achieve a safe configuration that can be applied not only to self-use during disasters but also to other systems. However, particularly when used as a system interconnection device for full purchase, it is necessary that the output of power to another system 18 that is not permitted be made possible in an emergency evacuation in the event of a disaster.

  Next, as a second embodiment, only when the switch 14 satisfies a certain limited condition, it is switched by software, and power is output from the connection terminal 15 to another system 18. It is comprised so that.

  That is, the above-described operation of “switch only by software only when a specific limited condition is satisfied” is configured to be performed by the security mechanism unit 17 of FIG. More specifically, the security mechanism unit 17 can be provided with an authentication system, and only a specific limited worker or a responsible person having a specific authority can issue a switch command to the switch 14. Configure as follows.

  The operation when this specific condition is satisfied will be described with reference to the flowchart of FIG. The flow chart of FIG. 2 is necessary when switching work is divided into a case where the grid interconnection device for power purchase according to the embodiment of the present invention is applied to the total purchase system and a case where it is applied to the surplus power purchase system. It is an example of the flow of processing until a switching permission command is issued. In the flowchart of FIG. 2, it is assumed that the authentication system according to the second embodiment of the present invention requests input of an ID that is an identifier for identifying a worker such as a person in charge and input of a password. The authentication of the person may be a system that can be authenticated by handing the IC card to a legitimate worker.

  This will be described based on the flowchart of FIG. First, in the case where the grid connection device for power purchase of the present invention is applied to the total purchase system, when the processing of the authentication system starts (step 200), the power from the grid connection device for power purchase is normally supplied by the power company. It is detected whether the power supply system 11 is supplied or stopped, that is, whether or not the power company system 11 is operating normally (step 210). If power is being supplied to the power company's grid 11 (NO in step 210), the power company's grid 11 is normal, and the above-mentioned "during emergency evacuation such as a disaster" described above. Does not correspond to Therefore, it is not permitted to switch the switch 14, that is, the process is terminated without outputting a switch permission command to the switch 14 because “the specific condition is not satisfied” (step 250). .

  On the other hand, if the electric power of the grid 11 of the electric power company is stopped (power failure state) (YES in step 210), this corresponds to the “emergency evacuation such as disaster” described above. Therefore, one of the “specific conditions” for switching the switch 14 is satisfied. However, the connection to the separate system 18 should be permitted only to a specific worker or responsible person, and it is necessary to provide a further safe working environment.

  Therefore, in the second embodiment of the present invention, the process waits for input of an ID and password by a specific worker (step 220). When the grid connection device for power purchase of the present invention is applied to the surplus power purchase system, step 210 is omitted, and the process directly waits for input of an ID and password by a specific worker (step 220). If the input ID and password are correct (YES in step 230), a switching permission command for permitting switching of the switch 14 is output (step 240), and the process ends (step 250). On the other hand, if the input ID and password are not correct (NO in step 230), the “specific condition” is not satisfied, and a switching permission command for permitting switching of the switch 14 is output. First, the process ends (step 250).

  In the above description, detecting whether power from the grid 11 of the electric power company is supplied or stopped (step 210) is to detect whether or not it corresponds to “emergency evacuation such as a disaster”. Yes, specifically, the power failure state of the grid 11 of the electric power company is detected. However, even if the grid 11 of the power company is in a power outage state, the instantaneous power failure state or the normal short time power outage state does not correspond to “emergency evacuation such as a disaster” in the present invention.

  When the grid connection device for power purchase of the present invention is applied to the total purchase system, that is, the grid interconnection device of the embodiment of the present invention corresponding to the total purchase system is allowed to output power to another system 18. Since this is exceptionally permitted only during “emergency evacuation such as a disaster”, strict detection, control, and processing must be performed. In addition, when the grid connection device for power purchase according to the present invention is applied to the surplus power purchase system, the connection work from the connection terminal 15 to the separate system 18 is performed in a safe state. Need to be able to provide. Therefore, there is an aim to confirm that the construction work is in a safe state. This is necessary both when applied to the full purchase system and when applied to the surplus power purchase system. This is because when power is supplied from the grid 11 of the power company, there is a risk that the worker / constructor may come into contact with equipment or terminals during the construction work, and is charged at a high voltage. In some cases, caution and consideration are necessary. In addition, when the voltage is extremely high, even if the worker / constructor is not in contact with the charging unit, attention may be required only by approaching the charging unit. It is necessary for ensuring safety to detect whether the vehicle is stopped or stopped.

  In the description of the first embodiment described above, a sealing cover having a sealing structure for the switching lever and the like of the connection terminal 15 is provided, which is destroyed in the event of a disaster to expose the switching lever and the like of the connection terminal 15, so that He explained that connection work to 18 would be done. However, both the first embodiment and the second embodiment described above may be used in combination without being carried out independently. That is, in the process of step 240 in the flowchart shown in FIG. 2, an opening permission command for opening the sealing structure may be output to the sealing mechanism unit when a switching permission command is issued to the switch 14. . For example, a step of outputting an opening permission command (without a flowchart) is provided, and the opening of the sealing cover is permitted by the opening permission command. Further, for safety, it is preferable to provide an opening mechanism portion that can be opened after the opening permission command is output.

  Further, the authentication system in the security mechanism unit 17 is not limited to an authentication method by inputting an ID / password. For example, the sealing structure may be based on locking of a key, and the one that is unlocked by inserting a dedicated key for unlocking may be used, or one that is used in combination with the authentication system described above may be used. In addition, biometric authentication systems that use biometric information such as fingerprints, iris patterns, retinal patterns, vein patterns, and voiceprints of specific authorized workers / responsible persons, systems that use IC cards, The system used together may be used.

Here, the reason for limiting the construction work to a specific authorized worker / responsible person is as follows.
Although it is one repetition, although it is the grid connection apparatus for power purchase of the Example of this invention which can switch an electric power grid | system, it is not made easy to connect to the separate system 18 by an unspecified person. In order to limit, the actor is limited.
Even if it is applied to the total purchase system or to the surplus power purchase system, it is usually a connection work related to the power system 11, so that the work can be performed safely. This is because it is limited to actors with specialized knowledge, technology, and qualifications necessary for the connection work. Therefore, only an actor who can safely perform the connection work to the separate system 18 is allowed to perform the work such as connection.
Next, in particular, when used as equipment corresponding to the total purchase system, connection / output to the separate system 18 is permitted exceptionally only during “emergency evacuation such as disaster”.

  Next, a device layout implementation form in the block diagram of the power purchase grid interconnection apparatus of the embodiment of the present invention shown in FIG. 1 will be described with reference to FIG. FIG. 3A is a front view showing a part of the grid connection device for power purchase according to the embodiment of the present invention, and FIG. 3B is a side view showing a part of the system. is there.

  The housing 13 is configured by connecting a plurality of three rectangular parallelepiped boxes 13a, 13b, and 13c. There is no wall at the boundary between the boxes 13a, 13b, 13c, and the outer wall of each box has a door structure that can be opened and closed to facilitate work during maintenance and setting. Of course, from the viewpoint of safety, a wall is provided at the boundary of each box 13a, 13b, 13c, and each box may be an independent box, and is a box between the low pressure system (LS) and the high pressure system (HS). A wall may be provided only at the boundary between 13a and 13b. Although the mounting arrangements in FIGS. 1 and 3 are reversed on the left and right, it does not affect the invention. In the present specification, the terms “upper”, “lower”, “right”, “right” are for explaining the arrangement in each drawing with good understanding, and are not essential requirements for the invention.

  In FIG. 3, the power conditioner 2 is disposed in the right box 13a, and the step-up transformer 6, the vacuum circuit breaker 7, and the disconnector 8 are disposed in the box 13b adjacent to the box 13a. Further, a power supply / demand transformer 9 and a watt hour meter 12 are disposed in the adjacent box 13c. Ventilation fans 24 and 24 are installed above the box body 13a and the box body 13b. By exhausting the heat generated from the power conditioner 2 and the step-up transformer 6 to the outside of the casing 13, the inside of the casing is I try not to get hot. When the total heat generation amount is small, one of the ventilation fans 24 may be omitted. In this case, it is desirable to omit the ventilation fan 24 of the box 13b and leave the ventilation fan 24 of the box 13a with the power conditioner 2 having a large calorific value. Moreover, you may comprise so that either of the two ventilation fans 24 and 24 may be stopped.

  Here, the box 16 provided in FIG. 3 is provided in a box 13a on the low-voltage system (LS) side, and is configured as a box-shaped structure including the switch 14 and the connection terminal 15. In the embodiment of FIG. 3A, the box 16 is provided in the box 13a on the low-voltage system (LS) side for ease of wiring. That is, the box 16 is provided in the box 13a in order to output the output power from the power conditioner 2 from the connection terminal 15 via the switch 14 by a short connection line. However, it is also conceivable that the box 16 is provided in the box 13c due to the arrangement space of each device in the housing 13.

  As described above, the box 16 has a sealed structure. Specifically, the cover is covered with a sealing cover.

  The equipment housed in the boxes 13a and 13b in the casing 13 is managed by the power selling side, and maintenance work is performed. In addition, the equipment stored in the box 13c is managed by the electric power company, and maintenance work is performed. In the case where the box 16 is provided in the box body 13a, this is suitable for the power selling side to perform connection work. Further, in the case of the configuration in which the box 16 is provided in the box 13c, even if the power company performs the connection work or the power selling side performs the connection work, it is suitable for performing the connection work under the management of the power company. Yes.

  In any case, according to the present embodiment, the low-voltage system (LS) device and the high-voltage system (HS) device are housed in the same housing, so that the installation area can be reduced and space saving can be achieved. Moreover, as shown in FIG. 1 or FIG. 3, a conventional low voltage system voltage is created by using the power purchase system interconnection device configured by placing the step-up transformer 6 and the power conditioner 2 in one casing. Therefore, the AC power passing through the reactor 4 of the power conditioner 2 can be transmitted to the step-up transformer 6 as it is, and the power conditioner unit can be transformerless.

  The conventional low-voltage transformer has a loss in itself, and by eliminating this transformer, the loss can be reduced and the power generation efficiency can be improved. The low-voltage transformer also has a function of insulation from the power company system. In the embodiment of the present invention, since the low-voltage transformer is not required, this insulation function is achieved by the step-up transformer 6. Devised to substitute.

  Here, a method for enabling the connection work to be safely performed on the connection terminal 15 for the separate system 18 will be described with reference to FIGS. 4 and 5. FIG. 4 shows an example of connection to another system 18 in order to supply output power from the grid interconnection apparatus according to the embodiment of the present invention to a highly public facility P such as a hospital as emergency evacuation such as a disaster. It is a figure explaining the status display in the step which permits construction.

  In FIG. 4, the status display panel 400 is provided so as to be visually seen at any position of the housing 13 of the grid interconnection device according to the embodiment of the present invention. The installation position of the state display panel 400 is preferably in the vicinity of the box 16. The status display panel 400 permits a “system power cut-off” display 410 indicating that power from the grid 11 of the power company is stopped (power failure status), and connection work to another grid 18 is permitted. An example is shown in which a “construction possible mode” display 420 indicating that the connection work has been completed and a “disaster output mode” display 430 indicating that power is being output to another system 18 is displayed as highlights. Yes. For example, characters such as “system power cut-off”, “construction possible mode”, and “disaster output mode” may be blinked by blinking the display LED.

  When connection switching work is performed in the grid connection device for power purchase according to the embodiment of the present invention, the “system power cut-off” display 410 and the “construction possible mode” display 420 are displayed on the status display panel 400. After confirming the above, connection work with the connection terminal 15 is performed toward the other system 18. Next, the flow until the “construction possible mode” display 420 is displayed will be described with reference to the flowchart of FIG.

  As shown in FIG. 5, first, when the process of displaying the “construction possible mode” display 420 on the status display panel 400 is started (step 500), power from the grid 11 of the power company is supplied or stopped. Is detected (step 510). If power is supplied from the grid 11 (NO in step 510), the usage state when applied to the total purchase system does not correspond to the above-mentioned "emergency evacuation such as disaster". . Therefore, since the output to the other system 18 is not permitted, that is, “the specific condition is not satisfied”, the transition to the “construction possible mode” display 420 is prohibited, and the processing is ended (step 590). . Further, even when applied to the surplus power purchase system, if power is supplied from the grid 11 (NO in step 510), it may not be safe to perform the construction, so the power grid stop process 515 I do. Thereby, the safety of construction can be secured.

  On the other hand, if the power from the grid 11 is stopped (power failure state) (YES in step 510), the construction safety is maintained, or “emergency evacuation such as disasters” in the total purchase system described above. Corresponds to "time". Therefore, in order to achieve a state satisfying one of “a construction safety ensuring state” or “a specific condition” in which power output to another system 18 is permitted, “construction indicating that connection switching work is permitted” The “possible mode” display 420 is displayed and the processing of the step may be advanced.

Moreover, it is detected whether the output power is output from the power conditioner 2 (step 520). If power is being output from the power conditioner 2 (NO in step 520), touching a device or terminal including the connection terminal 18 will touch a charged part due to power supply, and there is a risk of electric shock or the like. However, attention is required. In such a state of caution, it is not preferable to perform construction. Therefore, the process is terminated without displaying the “construction possible mode 420” (step 590).
On the other hand, if the output power of the power conditioner 2 is stopped (YES in step 520), it can be said that the environment is close to the wiring work, and the process proceeds to the next process.

  Next, it is necessary to provide a further safe working environment so that the connection switching work to the separate system 18 is permitted only to a specific worker. Therefore, it waits for input of ID / password by a specific worker (step 530). If the input ID / password is correct (YES in step 530), the process proceeds to the next process, and the absolute maximum rating of the power output from the power purchase grid interconnection device of the embodiment of the present invention is displayed (step). 550). The step of inputting the ID / password by this specific worker does not necessarily have to be performed at this timing, but can be input when it is necessary to be an authorized worker. It is also possible to input immediately after the start.

  Next, the magnitude of power required at the supply destination P connected as the separate system 18 and the magnitude of demand power are input (step 560). In general, construction is started after confirming the specifications of both powers in advance, but it is input for confirmation for safety. If the absolute maximum rated power of the output power from the grid interconnection device is larger than the demand power capacity of the power supply destination (YES in step 570), the “construction possible mode” display 420 as the next process is displayed. On the other hand, when the input of the demand power capacity of the power supply destination P is accepted (step 560), it is compared with the magnitude of the absolute maximum rating of the output power from the grid connection device for power purchase according to the embodiment of the present invention (step 560). 570), when the magnitude of the absolute maximum rating of the output power of the grid connection device for power purchase is smaller (NO in step 570), the process ends without shifting to the “construction possible mode” display 420. (Step 590).

  In the above description, if the input ID / password is not correct (NO in step 540), the “specific condition” is not satisfied, and the process does not proceed to the “construction possible mode” display 420. The process ends (step 590).

  Here, the display screen of the display device that contributes to efficiently executing the determination of the connection possibility in the flowchart of FIG. 5 will be described with reference to FIG.

  The display device 600 illustrated in FIG. 6 may be the same as the status display panel 400 illustrated in FIG. 4 or may be a different display device. The display screen of the display device 600 includes a display screen unit 605 for displaying comments and messages, a numeric keypad unit for inputting an ID / password, and a button input unit 640 as a touch panel. A key hole 645 for inserting a dedicated key for unlocking, and a biometric authentication operation unit 650 for authenticating a specific actor. Of course, the display device 600 may be configured by an input means such as a keyboard button for inputting an ID / password.

  When an ID / password or the like is input using the display device 600 as shown in FIG. 6 and the input ID / password is correct (YES in step 540), in step 550, the display screen 605 in FIG. Above, the display 610 of the value of the absolute maximum rating of the grid connection device for power purchase according to the embodiment of the present invention is displayed. In the next step 560, after the demand power capacity of the power supply destination is input, the display 615 of the input power demand capacity of the power supply destination is displayed.

  In step 570, if the power demand power capacity of the power supply destination is larger by comparing the absolute maximum rated power of the output power from the power purchase grid interconnection device of the embodiment of the present invention and the power demand capacity of the power supply destination. A display 620 in which the power demand capacity of the power supply destination exceeds the absolute maximum rating is displayed. In the embodiment of FIG. 6, 80% of the absolute maximum rating including the margin is used as a criterion for determination with the intention of increasing safety. Of course, the screen is not limited to 80%, and the safety value is judged and compared using the management value as a guideline that can be obtained from regulations on the handling of electric power, or a predetermined guideline that can be aimed at enhancing safety based on experience. It may be displayed on the screen.

  As a result of the determination, comparison, and processing in step 570, if it is determined that the power output to the other system 18 is not appropriate, a display 625 for prohibiting connection is displayed for safety. To do. In addition, as a message to the actor / worker who performs the construction, a display 630 indicating that the construction specifications are to be reconsidered is displayed, or a consultation destination display 635 for enabling connection work to another connection destination is displayed. May be displayed to support the construction. By touching the display part of the consultation destination display 635 and pressing the screen, it may be possible to automatically contact the consultation destination. For example, a configuration in which a telephone call is automatically made or an email is transmitted is possible.

Next, another third embodiment will be described with reference to FIG. FIG. 7 is a block diagram for adjusting the power phase of the plurality of power conditioners 2,... 2 corresponding to the plurality of power generation systems (solar panels 1,... 1). In FIG. 7, the same components as those in FIG.
In FIG. 7, the switchers 20 and 20 are provided with a switcher 14 that connects / cuts off a plurality of power generation systems (solar panels 1,... 1) and a line to the step-up transformer 6. The code | symbol 21 in FIG. 7 is a power phase detection apparatus connected to the connection point of the vacuum circuit breaker 7 and the disconnecting switch 8, and detecting the power phase of a high voltage | pressure system. Reference numeral 22 in FIG. 7 is an output phase adjustment device for feeding back the phase output from the power phase detection device 21 to the inverter 3 through the gate circuit 23. The inverter 3 generates an alternating current having a phase that matches the detected phase of the high-voltage system and supplies it to the step-up transformer 6.

  Since the connection point of the vacuum circuit breaker 7 and the disconnector 8 where this phase is detected is arranged in the housing 13 so as not to connect other loads, an unexpected load may be connected. Absent. Therefore, there is little delay in the power factor in the feedback detected from this connection point, and the power factor 1 at the power receiving point can be realized more reliably. In addition, since the connection point between the vacuum circuit breaker 7 and the disconnecting switch 8 is arranged in the same housing 13 as the inverter 3, the phase signal of the connection point (power receiving point, supply point) of the high voltage system is transmitted in the housing 13. Easy to capture.

  In addition, in a device having a transformer capacity up to 300 kVA, a load switch (LBS: air load switch) that protects and switches the line is used instead of the vacuum circuit breaker 7 and the disconnect switch 8. The power phase signal is taken from the high voltage system side of the load switch. The above is a description of a mechanism for realizing a power factor of 1 at a power receiving point by normal operation of facilities corresponding to a power purchase grid interconnection device.

  Here, a description will be given of a configuration that realizes a power factor of 1 when power is output to another system 18 by the grid connection device for power purchase shown in FIG.

  As shown in FIG. 7, the power phase detection device 21 obtains phase information used for feedback control of the inverter 3 via the switch 28. When the equipment corresponding to the grid connection device for power purchase is operated normally, the switch 28 is connected to the contact a, so that the phase is determined from the connection point of the vacuum circuit breaker 7 and the disconnecting switch 8 as described above. Is detected.

  On the other hand, in the case of emergency evacuation such as a disaster, when power is output to another system 18, the phase is detected from the input terminal to the switch 14 that switches to the connection terminal 15 as shown in FIG. To be. An input terminal for output power to the switch 14 is connected to the contact b of the switch 28. During an emergency evacuation such as a disaster, the switch 28 switches to the contact point b, and the phase of the output power input to the switch 14 detected by the power phase detector 21 (that is, the phase of the power output from the connection terminal 15). ), The inverter 3 is feedback-controlled. This makes it possible to achieve a power factor of 1 at the power receiving point even during an emergency evacuation such as a disaster.

  Further, an embodiment effective when the grid connection device for power purchase of the present invention is actually applied in the power purchase system will be described with reference to FIGS.

  In the description of the grid interconnection device for power purchase in the above embodiment, in the device used for the surplus power purchase system, surplus power is sold while supplying power to one's own facility as self-consumption, at the time of disaster, etc. It has been described that direct output to another power system is performed as necessary. On the other hand, in the explanation of the equipment used for the total purchase system, which is a new purchase system, the explanation was focused on supplying power to facilities other than oneself in an emergency evacuation, although it was a system for purchasing all the generated power. In this way, in the power purchase system, whether it is a full-volume purchase system or a surplus power purchase system, in addition to supplying power to the power system at the time of selling electricity, It is fully anticipated that there will be a demand for power to your facility. In order to realize this, this system can propose a configuration in which a plurality of output terminals are provided.

  That is, at least two output terminals are provided, the first output terminal is used as an output terminal for supplying emergency evacuation power to other facilities other than one's own facility, and the second output terminal is used as power for one's own facility. Can be used as an output terminal.

  FIG. 8 is a configuration block diagram of a power purchase grid interconnection device system that can output power from the power generation devices 1 and 1 such as solar power generation from a plurality of output terminals. In FIG. 8, as an example, an example of supplying power from the solar cell module 1 is illustrated as a power supply device, but it is not necessary to explain that this may be another power generation facility such as wind power generation. However, since the price of selling electricity varies depending on the power generation equipment, measures should be taken. Components common to those in FIG. 1 are given the same reference numerals to indicate the relationship with FIG. That is, the configuration common to the configuration shown in FIG. 1 is not explicitly shown.

  In FIG. 8, the output from the switch 14 can be output as a plurality of output destinations by branching to the output A and the output B. Moreover, although it is not necessarily obliged to provide and it is not obligatory, it is possible to provide the calibration instrument 83 and the calibration instrument 84 in each output A and B, respectively. The calibration instruments 83 and 84 can acquire, store, and record the output power value output from the output A and output B as the integrated value of the numerical data. Thereby, for example, when the emergency evacuation power supply is prolonged, the value of the power supply amount between both the supply source and the supply destination can be confirmed with respect to the power supply with the supply destination. It provides a means.

In such a power purchase grid interconnection system, for example, when solar cell modules 1 and 1 are used, the output of the solar panel itself fluctuates in the weather and day and night, so that it is not possible to guarantee a constant power supply. There is a case. Therefore, in the output of power, when the sum of the output power to both terminals of output A and output B exceeds the limit capacity of the supply power of the connected supply source, for output A and output B The case where it becomes difficult to continuously supply power and the supply is to be stopped should be considered. For example, when there are a plurality of power supply output destinations (output A and output B) as in the apparatus configuration shown in FIG. 8, it may not be preferable to stop power supply to both at the same time.
In other words, there is no problem in the operation of the system if the amount of photovoltaic power generation ≧ load, but if the amount of photovoltaic power generation <load, consider some system stoppage, that is, shut off the output to the output destination A or B There is a need.

As one of the countermeasures in this case, when stopping power supply from the power purchase grid interconnection system, one of the output destinations A and B is forcibly cut off, and the remaining One solution can be proposed to supply continuously.
For example, the output of the output terminal with the higher priority is continued and the output of the output terminal with the lower priority is shut off. Or, for example, the output of the terminal with the smaller required power supply capacity is continued within a range not exceeding the limit capacity of the supplied power of the solar cell modules 1, 1, and the required power supply capacity The larger output is cut off and stopped.

  The component that blocks the output is the blocking portion 81 or the blocking portion 82 in FIG. The output cutoff control unit 80 performs the control. In FIG. 8, the output cutoff control unit 80 acquires and stores the power generated by the solar cell modules 1 and 1 as the power value T, and sums the output power (a and b) from the output terminal A and the output terminal B. When compared with (a + b), when the power value T is exceeded ((a + b)> T), the blocking unit 81 or blocking unit 82 of one output circuit is blocked. In the state shown in FIG. 8, the interruption unit 81 is continuously supplied with power by the control signal of the output interruption control unit 80, but the interruption unit 82 is interrupted, so that the power supply to the output terminal B is not performed. The state of not being performed is shown.

  The procedure in this case is described in the flowchart of FIG. In this case, it is assumed that the power supply to the output terminal A has priority over the power supply to the output terminal B. Information on the priority of the output destination is stored in the output cutoff control unit 80. In FIG. 9, when the output cutoff control unit 80 starts processing (step 90), a power value T that is a value of supplied power (which may be the maximum value) that is acquired or stored in advance, and a plurality of values When the sum (a + b) of the output power to the supply destination is compared (step 92) and the sum (a + b) of the power exceeds the power value T (step 92-YES), for example, exceeds the limit capacity of the supplied power In that case, a shutoff control signal is output to the shutoff unit 82, and the output to the output terminal B is shut off, or the shutoff is continued (step 94). If the total output power (a + b) does not exceed the power value T (step 92-NO), the output to the output terminal B is continued or returned (step 93).

  Next, the power value T is compared with the output power a to the output terminal A (step 96), and the output power a exceeds the power value T (step 96-YES). When exceeding, the control signal of interruption is outputted to the interruption unit 81, and the output of the output terminal A is interrupted or, if already interrupted, the interruption is continued (step 98). If the output power a does not exceed the power value T (step 96-NO), the output to the output terminal A is continued or returned (step 97). However, the embodiment of the flowchart of FIG. 9 exemplifies an embodiment in which the output of the output terminal with the higher priority is continued and the output of the output terminal with the lower priority is mainly cut off. As described above, the output terminal A is an example in which the power supply priority is higher than that of the output terminal B. Once the output terminals A and / or B are shut off, they can be returned from the shut-off state based on appropriate judgment criteria (steps 93 and 97). When returning the output to the output terminal, it is important to check the condition that the total sum (a + b) of the output power does not exceed the power value T or the condition that the output power a does not exceed the power value T. After the connection state of the output terminals A and / or B is restored (after steps 93 and 97), the process returns to step 92, and the procedure for determining whether or not to shut off the output terminals A and B is entered again.

  On the other hand, in FIG. 10, for example, the output of the terminal having the smaller power supply capacity required is continued in a range that does not exceed the limit capacity of the power supply of the solar cell modules 1, 1. An embodiment in which the output with the larger power supply capacity is cut off will be described. In FIG. 10, when the output cutoff control unit 80 starts processing (step 100) under the condition of a> b, it is the value of supplied power (which may be the maximum value) acquired or stored in advance. The power value T is compared with the sum (a + b) of output power to a plurality of supply destinations (step 102), and the sum (a + b) of the power exceeds the power value T (step 102-YES). When the limit capacity of power is exceeded, a cutoff control signal is output to the cutoff unit 81, and when the output to the output terminal A is cut off or is already cut off, the cutoff is continued (step 104). If the total power (a + b) does not exceed the power value T (step 102 -NO), the output to the output terminal A is continued or returned (step 106). As described above, the output terminal A once shut off can be returned from the shut-off state based on an appropriate judgment criterion (step 106). After the connection state of the output terminal A is restored, the process returns to step 102 and the procedure for determining whether or not to shut off the output terminal A is entered again.

  The embodiment of the flowchart of FIG. 10 illustrates an embodiment in which the output terminal B requires a smaller power value to supply power than the output terminal A (a> b). An example in which the output of the output terminal B having the smaller power value required for power supply is continued and the output of the output terminal A having the larger power value required for power supply is cut off is illustrated. is there.

  Further, the power value T, the power value a, and the power value b in the above-described embodiments of FIGS. 8 to 10 are the maximum value, the specification value, the rated value, or the power value generated by the power generation facility such as the solar cell module, or the like. The maximum value, the specification value, and the rated value of the power used in the load required at the supply destination from the output terminals A and B may be used. Or the instantaneous value of power generated by a power generation facility such as a solar cell module, the average value over a certain period, or the instantaneous value of power used at the load required at the supply destination, or It is good also as an average value in a predetermined period.

  In the examples of the flowcharts of FIGS. 9 and 10, the output terminal B is blocked or the output terminal A is blocked. The procedure for performing the re-output of the output terminal B and the re-output of the output terminal A after the shut-off is described for the return operation. In this case, in Step 92, Step 96, and Step 102 in which the power values are compared and determined, if the output terminal B is re-output and the output terminal A is re-output, the output power is Under appropriate judgment such as confirmation of a state where the power value T is not exceeded, the output terminal connection is restored so that these outputs are output again. Furthermore, the embodiments of the flowcharts of FIGS. 9 and 10 may be changed as appropriate, and these embodiments are within a range that can be sufficiently predicted by those skilled in the art. .

  As described above, according to the present invention, in the grid connection device for power purchase using natural energy power generation such as solar power generation and wind power generation, it is usually a facility corresponding to the power purchase system. Therefore, it is possible to provide a configuration that can output power to another system such as a highly public facility as an emergency evacuation use at the time of emergency evacuation such as a disaster (for example, an earthquake disaster). Moreover, this invention can provide the safe environment of the connection construction to the said different system | strain. Furthermore, at the time of emergency evacuation such as a disaster, even when power is output to another system, a power factor of 1 at the power receiving point can be realized.

DESCRIPTION OF SYMBOLS 1 ... Solar cell module 2 ... Power conditioner 3 ... Inverter (electric power conversion circuit)
4 ... Reactor 5 ... Conductor (electric wire)
6 ... Step-up transformer 7 ... Vacuum circuit breaker (VCB)
8 ... Disconnector (DS)
9 ... Electric power supply / demand instrument transformer (VCT)
10… Pillar air switch (PAS)
DESCRIPTION OF SYMBOLS 11 ... Electric power system 12 ... Electricity meter 12a ... Display window 13 ... Housing | casing, 13a, 13b, 13c ... Box 14 ... Switch 15 ... Connection terminal 16 ... Box 17 ... Security mechanism part 18 ... Separate system 21 ... Voltage phase Detection device 22... Output phase adjustment device 23... Gate circuit 28.

Claims (9)

A power conditioner that converts DC power from a renewable energy source such as solar power generation or wind power generation into AC power, and a step-up transformer that converts AC power output from the power conditioner into high voltage power, A grid connection device for power purchase that outputs high voltage power from the step-up transformer to a high voltage power system,
In order to output the output from the grid connection device for power purchase to a connection destination of a system different from the high-voltage power system, a switch for switching the connection destination is provided,
The switching device is provided between the power conditioner and the step-up transformer, and has a configuration in which switching operation of the switching device is limited. .   2. The power purchase grid interconnection apparatus according to claim 1, wherein the output system is branched so that the output from the switch can be output to a plurality of output destinations. 3. The power purchase grid connection according to claim 2, wherein each of the branched output systems includes a cutoff unit, and connection / cutoff of the cutoff unit is controlled by control of the output cutoff control unit. System equipment. The power purchase grid interconnection apparatus according to claim 1, wherein the power conditioner, the step-up transformer, and the switch are arranged in the same casing. A power conditioner that converts DC power from a renewable energy source such as solar power generation or wind power generation into AC power, and a step-up transformer that converts AC power output from the power conditioner into high voltage power, The power conditioner and the step-up transformer are arranged in the same housing, and are a power purchase system interconnection device that outputs high-voltage power from the step-up transformer to a high-voltage power system,
Provided in the same housing are a connection terminal for outputting the output from the grid connection device for power purchase to a system different from the high-voltage power system, and a switch for switching the connection destination of the output from the power conditioner. And
The switch is configured to switch the connection to the connection terminal that outputs the output from the power conditioner to the step-up transformer or the separate system, and the switching operation of the switch is limited. A grid interconnection device for power purchases. The switching device in which the switching operation is restricted includes a security mechanism unit that outputs a switching signal to the switching device,
A terminal box containing a connection terminal that outputs to the other system is provided, and the terminal box has a sealing structure covered with a destructible sealing cover, and the sealing cover is opened to connect to the other system. 6. The grid connection device for power purchase according to claim 5, further comprising an input unit that can be connected to a terminal and that inputs the password to the security mechanism unit. The grid connection device for power purchase is provided with a display device for displaying an operation state,
The display mode displayed on the display device is
A safety work mode for displaying that the connection work with the connection terminal to the different system can be safely done; and
6. The grid connection device for power purchase according to claim 5, further comprising a separate system output mode for displaying that power is output from the connection terminal to the separate system to the separate system. A power conditioner that converts DC power from a renewable energy source such as solar power generation or wind power generation into AC power, and a step-up transformer that converts AC power output from the power conditioner into high voltage power, The power conditioner and the step-up transformer are arranged in the same enclosure, and a method for outputting power to another system using a power purchase system interconnection device that outputs high-voltage power from the step-up transformer to a high-voltage power system Because
A connection terminal that outputs the output from the grid connection device for power purchase to a system different from the high-voltage power system, and a switch that switches a connection destination of the output from the power conditioner, the switch is The power switching system interconnection device is configured to switch the connection from an output from the power conditioner to a connection terminal that outputs to the step-up transformer or the separate system, and the power purchase system interconnection device outputs a switching signal to the switch Part
The security mechanism performs password authentication processing consisting of letters or numbers input by an operator, and if it is authenticated as a legitimate operator, outputs a switching permission command signal,
After output of the switching permission command signal, and characterized in that to enable switching it to the switch a connection destination of the output from the power conditioner from the connection to the high voltage power system to a connection terminal for outputting the each of the channels A method of outputting power to another system using a grid interconnection device for power purchase. In the display device that displays the operating state of the grid connection device for power purchase,
When the ID / password entered by a legitimate operator is authenticated and the switch detects that the output from the power conditioner has not switched the connection to the connection terminal to the other system Displays the safety work mode,
When the switch detects that the output from the power conditioner is switching the connection to the connection terminal to the other system, and it detects that the power is output from the connection terminal. 9. A method for outputting power to another system using the grid connection device for power purchase according to claim 8, wherein the grid output mode is displayed.

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