Power control device and distributed power system

Abstract

The present invention provides a power control device that reduces power loss from inverters and improves ease of installation when introducing a distributed power supply system connected to the commercial power grid. [Solution] A power control device comprising: a distribution board section having a first terminal connected to a commercial power grid and a second terminal that serves as at least a power output terminal to a load; an inverter section connected to one or more distributed power sources and converting DC power output from the distributed power sources into AC power; and a housing that accommodates the distribution board section and the inverter section.

Description

Technical Field

[0005] , , ,

[0001] The present invention relates to a power control device and a distributed power system.

Background Art

[0002] In recent years, as distributed power systems operated in connection with commercial power systems, various distributed power systems such as photovoltaic (PV) power generation systems, vehicle-to-home (V2H) systems that connect the storage battery for driving electric vehicles to the electrical system of facilities, etc. have become widespread in ordinary households. In addition, it is also common to use multiple such distributed power systems together (for example, Patent Document 1, etc.).

[0003] When introducing such a distributed power system to each customer, a power conditioner (PCS: Power Conditioning System) equipped with an inverter that converts the DC power output from the distributed power into AC power is installed. The PCS is connected to the distribution board via a cable (AC power line) laid in the customer's home. And the AC power output from the PCS during grid connection is transmitted to the distribution board, supplied to the load, and the surplus for the load is reverse-fed to the commercial power system.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, in the conventional distributed power systems described above, the distribution board and the PCS are installed in separate locations within the customer's premises (typically the distribution board is installed on a wall near the ceiling indoors, and the PCS is installed on the exterior wall of the house), and are connected by a three-wire cable. However, there are limitations on the length of the cable connecting the distribution board and the PCS, and in some cases, due to limitations on the location where the PCS can be installed, it may not be possible to implement a distributed power system.

[0006] Furthermore, if the distance between the PCS and the distribution board (i.e., the point of power reception) is large, the impedance of the cable increases, which often leads to problems such as having to limit the output from the PCS due to the rise in the voltage at the point of power reception. Also, the greater the distance between the PCS and the distribution board, the higher the wiring costs.

[0007] Furthermore, because the PCS and the distribution board are installed in separate locations, work must be performed at each installation site, resulting in increased labor costs for two locations and the potential for errors in cable connections.

[0008] This invention has been made in view of the above-mentioned problems, and aims to provide a power control device that can reduce power loss from inverters and improve ease of installation when introducing a distributed power supply system connected to a commercial power grid. [Means for solving the problem]

[0009] To solve the above problems, the present invention adopts the following configuration as one embodiment. That is, An inverter unit that is connected to one or more distributed power sources and converts DC power output from the distributed power sources into AC power, A first terminal connected to the commercial power grid, and a second terminal which is at least the power output terminal to the load. A distribution board section equipped with a child, The power control device comprises a housing that accommodates the inverter unit and the distribution board unit.

[0010] Here, "a second terminal that is at least the power output terminal to the load" means not only an output terminal that outputs power to the load, but also a terminal that receives power input from other devices, i.e., an input / output terminal. Furthermore, it includes not only cases where it is directly connected to the load, but also cases where power is output to the load via other components such as a main distribution board.

[0011] With the above configuration, since the inverter unit and the distribution board unit are housed in the same enclosure, the length and number of cables between the inverter and the distribution board can be reduced compared to conventional systems. This significantly improves the ease of installation when introducing distributed power supplies. In other words, conventionally, the PCS (inverter) was installed in a location separate from the distribution board, which often caused difficulties in cable wiring depending on the installation location. However, it is now possible to introduce distributed power supplies without such constraints. In addition, since the inverter unit and the distribution board unit are housed in a single enclosure, it is possible to prevent cable connection errors.

[0012] Furthermore, since the impedance due to the cable between the inverter unit and the distribution board unit can be reduced, the rise in the voltage at the point of power reception can be suppressed, reducing the number of times output limiting is performed, and the output efficiency from the inverter unit can be improved.

[0013] Furthermore, the power control device has a main ammeter for measuring the current of the main line connected to the commercial power grid, and the main ammeter may be integrated with the inverter unit.

[0014] When using batteries as a distributed power source, an ammeter is installed to acquire current information from the main circuit (receiving point) for charge and discharge control. However, if the distance between the inverter and the ammeter is large, it negatively affects the measurement accuracy. With the above configuration, the distance between the ammeter and the main circuit can be shortened, and the calibration of the ammeter used can be performed at the time of manufacturing the device. Therefore, even an ammeter with low accuracy can be used without problems. This makes it possible to reduce product costs.

[0015] Furthermore, the housing is equipped with a lid that can be opened and closed, and is configured to allow operation of the equipment located in the distribution board section when the lid is open. The enclosure may further have a partition structure that separates the inverter section from the distribution board section and also covers the inverter section even when the lid is open.

[0016] The inverter section experiences high voltage, high current, and high temperatures (to the human body), making it dangerous if users can easily access it. However, with the structure described above, even if the cover can be opened and the distribution panel can be operated, contact with the inverter section can be prevented.

[0017] Furthermore, the distribution board section and the inverter section may be separated into left and right sections within the housing by the partition structure. Since the switches and switches arranged in the distribution board section are generally elongated, this shape allows for a more compact device size.

[0018] Furthermore, the distribution board section and the inverter section may be separated vertically within the housing by the partition structure, with the distribution board section located on the lower side. With such a configuration, if the device is installed on a wall near the ceiling, similar to a typical distribution board, the user can... The control panels, such as switches, circuit breakers, and controllers, can be easily accessed.

[0019] Furthermore, the distribution board section and the inverter section may be separated front to back within the housing by the partition structure, with the distribution board section positioned at the front. With such a configuration, the space above, below, left to right can be used efficiently when installing the device. In addition, easy access to the distribution board section can be ensured, while preventing user access to the inverter section in a natural manner.

[0020] Also, inside the housing, the distribution board section and the inverter section are partitioned so as to be in different layers, and the partition structure is provided with an opening that communicates the distribution board section and the inverter section. Among the components arranged in the distribution board section, the components connected to the components arranged in the inverter section via electric wires are arranged around the opening, and the location where the terminals of the electric wires are fixed in the inverter section may be arranged in a region corresponding to the position where the opening is provided in a plan view. According to such an aspect, the installation area of the device can be made space-saving, and the workability of wiring across layers can be improved.

[0021] Also, inside the housing, the distribution board section and the inverter section are partitioned so as to be in different layers, and at least the distribution board section includes double-layer connection components that are connected to same-layer components, which are other components arranged in the same layer, and also connected to other-layer components, which are components arranged in the other layer. The double-layer connection components are connected to at least one of the same-layer components by a bus bar and connected to the other-layer components by an electric wire, and the terminals on the double-layer connection component side of the bus bar and the electric wire may be fixed by co-fastening.

[0022] According to such a configuration, it is possible to suppress the intersection of wirings inside the device, and by performing the connection of components within the same layer with a bus bar, the strength against vibration and load can be improved, and by performing the connection across layers with an electric wire, it is possible to suppress the application of a load in the direction perpendicular to the panel surface through the connection part.

[0023] Also, the partition structure may be formed of resin. Further, the partition structure may include a heat insulating material. The switches and circuit breakers arranged in the distribution board section are vulnerable to heat, and even if there is no overcurrent or leakage due to being exposed to high temperatures, there is a risk of cutting off the circuit. In this regard, with the above configuration, it becomes possible to suppress such malfunction.

[0024] Further, the inverter unit is unitized and detachably arranged with respect to the housing, and the power control device may further include a manual switch that can open and close an electric circuit between the inverter unit, the commercial power system, and the load. Since components of the inverter unit (such as switching elements) are more likely to fail than components of the distribution board unit (such as circuit breakers), maintainability can be improved if only the inverter unit can be replaced. And with the above configuration, the inverter unit can be safely attached and detached while power is being supplied from the commercial power system to the load (without interrupting the load), thus enhancing convenience.

[0025] Further, the distributed power source may include a storage battery, and the inverter unit may include a bidirectional inverter configured to convert AC power supplied from the commercial power system into DC power and output it. Note that the storage battery as the distributed power source includes a storage battery that can be detached from the system, such as the storage battery of an electric vehicle in a V2H system. With such a configuration, when using a storage battery as the distributed power source, it is also possible to charge the storage battery with power from the commercial power system.

[0026] In addition, each of the above configurations can be combined with each other to constitute the present invention as long as no technical contradiction occurs.

Effects of the Invention

[0027] According to the present invention, when introducing a distributed power source system linked to a commercial power system, it is possible to provide a power control device that can reduce the loss of power output from the inverter and improve construction efficiency.

Brief Description of the Drawings

[0028] [Figure 1] FIG. 1 is a schematic diagram showing a schematic configuration of a distributed power source system according to an application example of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing a schematic configuration of a distributed power source system according to an embodiment of the present invention. [Figure 3] Figure 3A is a first diagram showing a schematic configuration of a power control device according to an embodiment of the present invention. Figure 3B is a second diagram showing a schematic configuration of a power control device according to an embodiment of the present invention. [Figure 4] Figure 4 is a schematic circuit diagram showing the circuit configuration of a power control device according to an embodiment of the present invention. [Figure 5] Figure 5A is a first diagram showing the schematic configuration of the power control device according to the first modified example. Figure 5B is a second diagram showing the schematic configuration of the power control device according to the first modified example. [Figure 6] Figure 6A is the first diagram showing the schematic configuration of the power control device according to the second modified example. Figure 6B is the second diagram showing the schematic configuration of the power control device according to the second modified example. [Figure 7] Figure 7A is a schematic diagram illustrating the configuration of the opening in the power control device according to the second modified example. Figure 7B is a schematic diagram illustrating the connection structure of the components of the power control device according to the second modified example. [Modes for carrying out the invention]

[0029] <Examples of application> (Overall system configuration related to the application example) The present invention can be applied, for example, to a power control device 90 used in a distributed power system 9, such as one equipped with small-scale power generation equipment and installed in a customer's house, as shown in Figure 1. The distributed power system 9 according to this application example comprises a solar cell 7 as a distributed power source, a DC / DC converter 71, a power control device 90, and a main distribution board 81, and is connected to the commercial power grid 8 and supplies power to a load 82 in a customer's house.

[0030] (Power control device) As shown in Figure 1, the power control device 90 comprises an inverter unit 92 including a DC / AC conversion circuit (not shown), and a distribution board unit 91 including power input / output terminals 911 connected to the commercial power grid 8 and power output terminals 912 connected to the main distribution board 81, all of which are housed in a single enclosure 93.

[0031] The power (DC power) generated by the solar cell 7 is transformed by the DC / DC converter 71 and input to the inverter unit 92 of the power control device 90. The inverter unit 92 then converts the DC power to AC power and outputs it to the distribution board unit 91. In addition to the DC / AC conversion circuit, the inverter unit 92 also includes a control unit containing a processor and a communication unit containing a communication interface (IF) (neither of which are shown).

[0032] The distribution board section 91 outputs power supplied from the solar cell 7 (inverter section 92) to the load 82 (main distribution board 81) or the commercial power grid 8, and also supplies power from the commercial power grid 8. Power is output to load 82 (main distribution board 81). Although not shown in the diagram, the distribution board 91 is equipped with circuit breakers such as earth leakage circuit breakers (main breakers) and overcurrent circuit breakers, as well as a switch to switch between grid-connected operation and standalone operation.

[0033] When supplying DC power output from distributed power sources to loads or the commercial power grid, it is necessary to convert DC power to AC power via a DC / AC conversion circuit (inverter). Traditionally, such inverters were installed separately as PCS (Power Conditioning Systems) in a location separate from the distribution board. However, when the PCS (inverter) and the distribution board are installed separately in different locations, there are several issues: installation difficulties (errors in cable connection, difficulties in the installation location and wiring of the PCS, etc.), power generation efficiency issues (a long distance between the PCS and the distribution board can cause an increase in the voltage at the point of power reception, potentially leading to output limitations), and cost issues (each PCS and distribution board requires components such as enclosures, and costs are incurred depending on the length of the cable connecting them).

[0034] In this regard, a power control device 90 like the one in this application example allows the distribution board and the inverter to be placed in close proximity within the same enclosure 93, thereby solving the above-mentioned problems and achieving improved workability when installing a distributed power supply system, improved output efficiency from the inverter, and cost reduction.

[0035] <Embodiment> (Overall system configuration) Next, embodiments of the present invention different from the above-described examples will be explained in detail with reference to the drawings. Figure 2 is a schematic diagram showing the general configuration of the distributed power supply system 1 according to this embodiment. In this specification, components of the same nature are denoted by the same reference numerals, and components that are the same as those already described will be omitted from description as appropriate.

[0036] The distributed power system 1 according to this embodiment is a system installed in a general consumer's home and has three types of distributed power sources: a solar cell 7, a stationary storage battery 72, and a storage battery mounted on an EV (Electric Vehicle) 70 (hereinafter, including the mounted storage battery, it will be referred to as EV70), a power control device 10, a main distribution board 81, and a load 82.

[0037] The power control device 10 is housed in a casing 13 with an openable / closable lid 131 and includes an inverter unit that converts DC power to AC power and a distribution board unit that connects to the commercial power grid 8 (neither of which are shown in Figure 2). It is installed, for example, on a wall near the ceiling inside a customer's house. The power control device 10 will be described in detail later.

[0038] The solar cell 7 outputs power to the inverter section of the power control device 10 via the DC / DC converter 71. The storage battery 72 has a built-in DC / DC converter circuit and performs DC power input and output (charging and discharging). The EV 70 performs DC power input and output (charging and discharging) via the EV DC / DC converter 73 (built into the EV unit, for example) which enables the EV 70 to function as a V2H system.

[0039] (Power control device) Next, the configuration of the power control device 10 according to this embodiment will be described based on Figures 3A, 3B and 4. Figure 3A is a schematic diagram (block diagram) showing the approximate configuration of the power control device 10 when viewed from the front through the cover 131. Figure 3B shows the approximate configuration of the power control device 10 when viewed from above through the cover 131. Figure 4 is a circuit diagram showing the approximate circuit configuration of the power control device 10. In this specification, assuming that the power control device 10 is installed in a wall inside a house, the ceiling side is defined as the upper side, the floor side as the lower side, and the side opposite the wall as the front, and the top, bottom, left, right, and front of the power control device 10 are defined accordingly.

[0040] (Distribution board section) The power control device 10 has a distribution board section 11 located on the right side inside the enclosure 13. The distribution board section 11 is equipped with power input / output terminals 111 connected to the commercial power grid 8, power output terminals 112 connected to the load 82 via the main distribution board 81, a ground fault circuit breaker 113, a manual switch 114 for maintenance, an overcurrent breaker 115, a grid-connected / standalone switch 116, and the like. Although not shown, it also includes a HEMS (Home Energy Management System). It may also be equipped with an operation panel for the system.

[0041] As shown in Figure 4, the manual switch 114 is a manually operated C-contact relay configured to allow switching of the connection destination to the load 82 (main distribution board 81). By switching the manual switch 114 to a circuit directly connected to the commercial power grid 8, maintenance work on the inverter unit 12 can be performed without interrupting the power supply from the commercial power grid 8 to the load 82 (without causing a power outage).

[0042] The grid-connected / standalone switch 116 is opened (turned off) when the power supply from the commercial power grid 8 is interrupted, for example, due to a power outage, so that power from each distributed power source supplied via the inverter unit 12 is supplied to the load 82.

[0043] (Inverter section) Furthermore, the power control device 10 has an inverter unit 12 located on the left side inside the housing 13. The inverter unit 12 has a power circuit including a bidirectional DC / AC inverter 122, a control unit 123 including a processor, a communication unit 124 including a communication IF, an ammeter 125 for measuring the current of the main power line, a PV input terminal 126, a battery input / output terminal 127, and an EV input / output terminal 128, and these components are covered by a resin partition 121. In Figures 3A and 3B, the shaded area indicates the area covered by the partition 121.

[0044] The bidirectional DC / AC inverter 122 is configured to convert between DC power and AC power in both directions. The AC side is connected to the earth leakage circuit breaker 113 of the distribution board 11, and the DC side is connected to the PV input terminal 126, the battery input / output terminal 127, and the EV input / output terminal 128. The bidirectional DC / AC inverter 122 can be constructed using any known technology. DC power from the solar cell 7 (DC / DC converter 71) is input to the PV input terminal 126, power input / output is performed with the battery 72 via the battery input / output terminal 127, and power input / output is performed with the EV 70 (EV DC / DC converter 73) via the EV input / output terminal 128.

[0045] The control unit 123 is responsible for controlling the entire device, including the output control of the bidirectional DC / AC inverter 122, based on sensor information such as voltmeters and ammeters located in various parts of the device, and setting information related to operation control. The communication unit 124 communicates with various sensors, distributed power supplies, protective relays, and external networks (cloud). Multiple different communication standards may be adopted depending on the connected equipment.

[0046] The ammeter 125 is an ammeter that measures the current in the main power line (point of power reception), and the charging and discharging of the storage battery 72, EV70 is performed using the current value measured by this ammeter. Since the ammeter 125 is installed in the inverter unit 12, it is possible to calibrate the ammeter used during the manufacturing of the device at the same time, so even an ammeter with low accuracy can be used without problems.

[0047] (Enclosure and partitions) The lid 131 of the housing 13 is provided to cover the top, bottom, left, right, and front of the power control device 10, and opens from the bottom to the top using a hinge (not shown) provided on the top of the housing 13 as an axis. It is configured to allow this.

[0048] With the cover 131 open, the operating parts (switches, control panel, etc.) of the distribution board section 11 on the right side are visible from the outside and can be operated. On the other hand, the inverter section 12 on the left side is separated from the distribution board section 11 by a resin partition 121, and is configured so that the various components of the inverter section 12 cannot be seen or touched. Note that the components enclosed by the dashed line in Figure 4 are the components included in the inverter section 12, i.e., the components that are covered by the partition 121.

[0049] The partition 121 may be configured to be detachable from the housing 13, but the entire inverter unit 12 can also be configured as a unit including the partition 121. By unitizing the inverter unit 12 in this way, it becomes easy to replace only the inverter unit 12.

[0050] (Effects specific to this embodiment) As described above, the power control device 10 according to this embodiment ensures safety because the inverter section 12, which generates high voltage, high current, and high temperatures, is covered by a partition 121, making it difficult for users to access. Furthermore, since the partition 121 is made of resin, the adverse effects of the heat from the inverter section 12 on the switches and breakers in the distribution board section 11 can be reduced. In addition, since the switches and breakers located in the distribution board section 11 are generally elongated, the distribution board section 11 and the inverter section 12 are separated left and right within the housing 13, allowing for a compact device size.

[0051] <Example 1> It should be noted that the above embodiments are merely examples of embodiments of the present invention, and the present invention is not limited to the above specific forms. The present invention can be modified in various ways within the scope of its technical concept. For example, in the above embodiments, the distribution board section 11 and the inverter section 12 were separated in the left-right direction within the housing 13 of the power control device 10, but as shown in Figures 5A and 5B, the distribution board section 11 and the inverter section 12 may be separated in the vertical direction.

[0052] Figure 5A is a schematic diagram of the power control device 20 according to this modified example, viewed from the front through the cover 131, and Figure 5B is a schematic diagram of the power control device 20 viewed from the right side through the cover 131. The configurations of the distribution board section 11 and the inverter section 12 are the same as those of the embodiment already described, so their description is omitted.

[0053] As shown in the modified power control device 20, by arranging the distribution board section 11 on the lower side of the housing 13 and the inverter section 12 on the upper side of the housing 13, thereby dividing the device into upper and lower sections, when the device is installed on a wall near the ceiling, the user can easily access the operating parts of the distribution board section 11, such as the switches, circuit breakers, and control panel.

[0054] <Modification 2> Figures 6A and 6B show the schematic configuration of the power control device 30 according to other modified examples. Figure 6A is a schematic view of the power control device 30 according to this modified example as seen from the front through the cover 131, and Figure 6B is a schematic view of the power control device 30 as seen from below through the cover 131.

[0055] In this modified example, the distribution board section 11 and the inverter section 12 are arranged in a front-to-back configuration, with the distribution board section 11 facing forward (further away from the wall). That is, when the cover section 131 is open, the inverter section 12 is hidden behind the distribution board section 11, creating a layered (two-layer) structure. With this configuration, the space required for installation of the device is reduced in all directions. This allows for efficient use of the inverter. Furthermore, it ensures easy access to the distribution board section 11 while preventing user access to the inverter section 12 in a natural manner.

[0056] Next, the wiring configuration of the power control device 30 according to this modified example will be described. Figure 7A is a schematic plan view illustrating the structure of the opening 230 and its surroundings for wiring the electric wires that connect the distribution board section 11 and the inverter section 12 in the power control device 30. Figure 7B is a schematic diagram illustrating the wiring configuration of the power control device 30 to the overcurrent breaker 115, showing the view from the direction of the arrow shown in Figure 7A.

[0057] The power control device 30 in this modified example has a hierarchical structure as described above, with the distribution board section 11 located on the front circuit board 210 and the inverter section 12 located on the rear circuit board 220. Therefore, after installation, the power control device 30 is in a state where it is not easy to access the inverter section 12 located at the rear because the distribution board section 11 is at the front. In other words, in this modified example, the front circuit board 210 also serves as (part of) the partition 121.

[0058] As shown in Figure 7A, the front substrate 210 is provided with an opening 230, and components that connect to components located on the rear substrate 220 (inverter section 12) (for example, an overcurrent breaker 115, a manual switch 114, etc.) are arranged around the opening 230.

[0059] On the other hand, on the rear circuit board 220 (inverter section 12), wiring connection terminals 221 for fixing the terminals of wires that connect to components (overcurrent breaker 115, manual switch 114, etc.) located in the distribution board section 11 are provided in an area visible through the opening 230. However, the diagram shown in Figure 7A shows a state in which some components have been omitted for the sake of clarity, and in reality, after the power control device 30 is installed, it is not possible to access the inverter section 12 through the opening 230 simply by opening the lid 131, as the wires and a cover (not shown) covering the opening are in place.

[0060] In this way, by arranging the components connected to the inverter unit 12 in the distribution board unit 11 around the opening 230, and by providing the wiring connection terminals 221 in the inverter unit 12 within the range corresponding to the opening 230, wiring work between the distribution board unit 11 and the inverter unit 12 can be easily performed, and the workability related to the installation of the device can be greatly improved.

[0061] Furthermore, as shown in Figures 7A and 7B, in the power control device 30 according to this modified example, the overcurrent breaker 115 located in the distribution board section 11 is connected to the manual switch 114, also located in the distribution board section 11, via a busbar 211, while it is connected to the connection terminals of the components located on the rear circuit board 220 (inverter section 12) via a wire 231. The connection terminals of the busbar 211 and the wire 231 on the overcurrent breaker 115 side are fixed together by fastening.

[0062] Note that Figure 7B shows an example in which the electric wire 231 is passed through a through-hole different from the opening 230 shown in Figure 7A. However, even without providing such a through-hole, the electric wire 231 may be wired to connect the overcurrent breaker 115 and the rear board 220 through the opening 230 (i.e., partially running over the front board 210).

[0063] This configuration prevents wiring from crossing within the device. Furthermore, connecting to the manual switch 114 on the same level with a rigid busbar 211 improves resistance to external forces (vibration and load). Additionally, connecting across levels with a flexible wire 231 prevents vertical external forces from being applied to each board via the connection point spanning the front board 210 and the rear board 220.

[0064] <Other> Furthermore, the present invention can be modified in various ways beyond those described above. For example, the partition 121 does not necessarily have to be made of resin. Also, the partition 121 can be formed to include an insulating material.

[0065] Furthermore, in the configuration described in Modification 2 above, the overcurrent breaker 115 and the manual switch 114 do not necessarily need to be connected by a busbar 211; they may also be connected by a wire 231. Also, although Modification 2 described a single large opening 230, multiple openings 230 may be provided.

[0066] Furthermore, although the above embodiment described a configuration example in which three different types of distributed power sources are connected, the type and number of distributed power sources can be arbitrarily determined. For example, not only solar cells and storage batteries, but also fuel cells and wind power generation systems can be used as distributed power sources.

[0067] Furthermore, while the power control devices in the above examples were configured to have a power output terminal 112 that outputs power to the load 82 via the main distribution board 81, the power output terminal 112 can also be changed to a power input / output terminal. In other words, the terminal connected to the load 82 in the power supply device only needs to be capable of outputting (supplying) power to the load 82, and does not need to be a terminal capable of power input. Specifically, for example, the main distribution board 81 can be configured to receive power from other distributed power sources and output it to the load 82 and the power control device as part of a distributed power system.

[0068] <Note 1>

[0069] A distribution board section (11, 91) having first terminals (111, 911) connected to a commercial power grid (8), and second terminals (112, 912) that serve as power output terminals to at least a load (82), An inverter unit (12, 92) connected to one or more distributed power sources (7, 70, 72) and converting DC power output from the distributed power sources into AC power, The distribution board section and the inverter section are housed in a housing (13, 93), Power control devices (10, 20, 30, 90).

[0070] <Note 2> It has a main ammeter (125) for measuring the current of the main line connected to the commercial power system, The main ammeter is configured to be integrated with the inverter unit. The power control device described in Appendix 1.

[0071] <Note 3> The housing is equipped with a lid (131) that can be opened and closed, and is configured to allow operation of the equipment located in the distribution board section when the lid is open. The enclosure further includes a partition structure (121) that separates the inverter section from the distribution board section and also covers the inverter section even when the lid is open. The power control device described in Appendix 1.

[0072] <Note 4> The distribution board section and the inverter section are separated into left and right sections within the housing by the partition structure. The power control device described in Appendix 3.

[0073] <Note 5> The distribution board section and the inverter section are separated vertically within the housing by the partition structure, with the distribution board section located on the lower side. The power control device described in Appendix 3.

[0074] <Note 6> The distribution board section and the inverter section are separated into front and rear sections within the housing by the partition structure, with the distribution board section positioned at the front. The power control device described in Appendix 3.

[0075] <Note 7> Within the aforementioned enclosure, the distribution board section and the inverter section are separated so as to be on different levels. The partition structure is provided with an opening (230) that connects the distribution board section and the inverter section. Of the components arranged in the distribution board section, the components (114, 115) that are connected to the components arranged in the inverter section via electric wires (231) are arranged around the opening, and the location (221) where the terminals of the electric wires are fixed in the inverter section is located in a region corresponding to the position where the opening is provided in a plan view. A power control device as described in any of the appendices 3, 5, or 6.

[0076] <Note 8> Within the aforementioned enclosure, the distribution board section and the inverter section are separated so as to be on different levels. At least the distribution board section includes a dual-layer connecting component (115) that is connected to other components located on the same layer, and also to components located on the other layer. The two-layer connecting component is connected to at least one of the same-layer components by a busbar (211) and to the other-layer component by a wire (231), and the terminals of the busbar and the wire on the two-layer connecting component side are fixed together by fastening. A power control device as described in any of the appendices 3, 5, 6, or 7.

[0077] <Note 9> The partition structure is formed of resin. A power control device as described in any of the appendices 3 to 8.

[0078] <Note 10> The aforementioned partition structure includes an insulating material. A power control device as described in any of the appendices 3 to 9.

[0079] <Note 11> The inverter unit is modularized and detachably arranged in the housing. The inverter unit further comprises a manual switch (114) capable of opening and closing the circuit between the inverter unit and the commercial power grid and the load. Power control devices as described in Appendix 1 to 10.

[0080] <Note 12> The aforementioned distributed power source includes storage batteries (70, 72), The inverter unit includes a bidirectional inverter (122) capable of converting AC power supplied from the commercial power grid into DC power and outputting it. A power control device as described in any of the appendices 1 to 11.

[0081] <Note 13> A distributed power system (1, 9) comprising a power control device (10, 20, 30, 90) as described in any of Appendix 1 to 12, and one or more distributed power sources (7, 70, 72) and loads (82), and connected to a commercial power grid (8). [Explanation of symbols]

[0082] 1.9. Distributed power systems 10, 20, 30, 90... Power control devices 11, 91... Distribution board section 111, 911... Power input / output terminals 112, 912... Power output terminals 113... Ground fault circuit breaker 114... Manual Switch 115... Overcurrent breaker 116... Interconnected / Independent Switch 12, 92... Inverter section 121... Divider 122...Bidirectional DC / AC Inverter 123... Control Unit 124... Communications Department 125...Main ammeter 126···PV input terminal 127...Battery input / output terminals 128...EV input / output terminal 13, 93... cabinet 131...Lid part 210...Front circuit board 211... Bus bar 220...Rear circuit board 221...Wiring connection terminals 230...Opening 231...Electric wire 7. Solar cells 70...EV 71. DC / DC Converter 72... Storage batteries 73. EV DC / DC Converter 8...Commercial power system 81... Main distribution board 82... Load

Claims

1. A distribution board section having a first terminal connected to the commercial power grid and a second terminal that serves as at least a power output terminal to the load, An inverter unit that is connected to one or more distributed power sources and converts DC power output from the distributed power sources into AC power, A housing comprising the distribution board section and the inverter section, Power control device.

2. It has a main ammeter for measuring the current of the main line connected to the aforementioned commercial power system, The main ammeter is configured to be integrated with the inverter unit. The power control device according to claim 1.

3. The housing is equipped with a lid that can be opened and closed, and is configured to allow operation of the equipment located in the distribution board section when the lid is open. The enclosure further includes a partition structure that separates the inverter section from the distribution board section and also covers the inverter section even when the lid is open. The power control device according to claim 1.

4. The distribution board section and the inverter section are separated into left and right sections within the housing by the partition structure. The power control device according to claim 3.

5. The distribution board section and the inverter section are separated vertically within the housing by the partition structure, with the distribution board section located on the lower side. The power control device according to claim 3.

6. The distribution board section and the inverter section are separated into front and rear sections within the housing by the partition structure, with the distribution board section positioned at the front. The power control device according to claim 3.

7. Within the aforementioned enclosure, the distribution board section and the inverter section are separated so as to be on different levels. The partition structure is provided with an opening that connects the distribution board section and the inverter section. Of the components arranged in the distribution board section, the components connected to the components arranged in the inverter section via electric wires are arranged around the opening, and the location where the terminals of the electric wires are fixed in the inverter section is located in the region corresponding to the position where the opening is provided in a plan view. The power control device according to claim 3.

8. Within the aforementioned enclosure, the distribution board section and the inverter section are separated so as to be on different levels. At least the distribution board section includes a dual-layer connecting component that connects to other components located on the same layer, and also to components located on the other layer. The two-layer connecting component is connected to at least one of the same-layer components by a busbar and to the other-layer component by a wire, and the terminals of the busbar and the wire on the two-layer connecting component side are fixed together by fastening. The power control device according to claim 3.

9. The partition structure is formed of resin. The power control device according to claim 3.

10. The aforementioned partition structure includes an insulating material. The power control device according to claim 3.

11. The inverter unit is modularized and detachably arranged in the housing. The inverter unit further comprises a manual switch capable of opening and closing the electrical circuit between the commercial power grid and the load. The power control device according to claim 1.

12. The aforementioned distributed power source includes a battery, The inverter unit includes a bidirectional inverter capable of converting AC power supplied from the commercial power grid into DC power and outputting it. The power control device according to claim 1.

13. A distributed power system comprising a power control device according to any one of claims 1 to 12, and one or more distributed power sources and loads, which is connected to a commercial power grid.

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