JP2017229173A - System interconnection apparatus and power distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system interconnection apparatus that can efficiently cool a device and reduce a temperature rise inside the apparatus.SOLUTION: A system interconnection apparatus comprises: a power conditioner including an inverter for converting generated DC power to AC power and a reactor; a step-up transformer for converting AC power output from the power conditioner to high-voltage power; and a breaker disposed between the step-up transformer and an existing high-voltage power system; the system interconnection apparatus supplying generated power to the high-voltage power system. The system interconnection apparatus includes: a ventilating fan disposed on a ceiling part of the apparatus; a heat shield duct disposed on the inner side of a wall surface of the apparatus; and an air intake aperture disposed on a lower part of the wall surface. The heat shield duct rises upwards from the lower part along the whole surface or part of the wall surface and is bent at the ceiling part toward the ventilating fan.SELECTED DRAWING: Figure 8

Description

  TECHNICAL FIELD The present invention relates to a system interconnection device and a switchboard composed of an air conditioner such as a ventilation fan for cooling the inside of a panel, and a power conditioner having a vent, a step-up transformer, and a circuit breaker.

  In the solar power generation system, a system interconnection device is provided that converts DC power obtained from the solar panel into AC power and connects it to the power system. Since the grid interconnection device is usually installed outdoors, a configuration is required to prevent the temperature in the device from rising due to solar heat.

  In order to prevent the temperature in the apparatus from rising due to solar heat, Patent Document 1 states that “a power conditioner having an inverter that converts DC power from a solar panel into AC power and the power conditioner” A switchboard that houses a transformer that boosts output AC power to high-voltage power, and a circuit breaker disposed between the transformer and an existing power system, and includes a door part, a side part, and a rear face of the switchboard The heat shield plate is disposed on the entire surface or a part of the portion, and "..." is described.

JP2015-89308A

  In the switchboard described in Patent Document 1, a heat shield plate is arranged on the surface so that the door of the switchboard is double, a space is provided between the door and the heat shield plate, an air layer is formed, and the indoor temperature rises I try not to. However, since the air layer between the door and the heat shield does not move, cooling is not sufficient. Moreover, although the gallery for intake is provided in the lower part of a door, there exists a problem that an intake air quantity will be restrict | limited because there exists a heat shield.

  An object of the present invention is to provide a system interconnection device capable of efficiently cooling equipment and reducing a temperature rise inside the device.

  In order to achieve the above object, the grid interconnection apparatus of the present invention usually has a heat shield structure attached to the outside of the apparatus, and a simple air layer provided with the duct structure to generate heat by an air flow operation. Cool the part efficiently.

  If an example of the system connection apparatus of this invention is given, the inverter which converts the generated direct-current power into alternating current power, the power conditioner which has a reactor, and the alternating current power output from the said power conditioner into high voltage power A step-up transformer for converting, and a circuit breaker provided between the step-up transformer and the existing high-voltage power system, and supplying the generated power to the high-voltage power system. A ventilation fan disposed on the ceiling, a heat shield duct disposed on the inside of the wall surface of the apparatus, and an air intake opening disposed at a lower portion of the wall surface. It rises upward from the lower part along the part, and is bent toward the ventilation fan at the ceiling part.

  According to the present invention, by providing a simple air layer inside the apparatus, temperature rise inside the apparatus due to external factors of the apparatus such as sunlight can be suppressed, and efficient equipment cooling can be performed by airflow operation. .

It is an example of the block block diagram of the apparatus for grid connection which has air conditioning equipment, such as a ventilation fan. It is the external view (rear view) of the apparatus for grid connection which has air conditioning equipment, such as a ventilation fan. It is the external view (left view) of the system connection apparatus which has air conditioning equipment, such as a ventilation fan. It is an external view (front view) of the apparatus for grid connection which has air conditioning equipment, such as a ventilation fan. It is an external view (right view) of the system connection apparatus which has air conditioning equipment, such as a ventilation fan. It is a panel ventilation structure (right side view) of Example 1. It is a figure which shows the flow of the wind by the panel ventilation structure of Example 1. FIG. It is a conventional panel ventilation structure (right side view). It is a figure which shows the flow of the wind by the panel ventilation structure of conventional structure. It is a panel ventilation structure (front view) of Example 2. It is a figure which shows the flow of the wind by the panel ventilation structure of Example 2. FIG. It is a panel ventilation structure (right side view) of Example 3. It is a figure which shows the flow of the wind by the panel ventilation structure of Example 3. FIG.

  Normally, the grid interconnection device installed outdoors is required to have a structure that can block the temperature rise outside the panel in order to suppress the temperature rise from an external factor caused by sunlight or the like. Moreover, when performing the apparatus cooling structure by a ventilation fan etc., the structure which arrange | positions a ventilation fan in the board upper part, and provides an opening in the board lower part side surface is required. Therefore, there has conventionally been a structure as shown in FIG. 8 as a structure that can block temperature rise outside the panel and a cooling structure that uses a ventilation fan. In this structure, heat shields 16 are provided on the front and back of the panel, an air layer is formed between the casing, air is sucked from the vent 14 provided on the door, and exhaust is exhausted from the ventilation fan 12 installed on the ceiling of the panel. Do. Therefore, the inventor of the present application devised a new heat shield structure and studied the circulation structure of the air in the panel.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example of a block configuration diagram of a system interconnection device having air conditioning equipment such as a ventilation fan according to the present embodiment. The DC power generated by the solar cell module 1 is converted into AC power by the inverter 3 in the power conditioner 2, and after being converted into AC power having a waveform sine wave via the reactor 4, the AC power is Power is transmitted to the step-up transformer 5. The step-up transformer 5 is an insulating transformer that converts low-voltage AC power output from the power conditioner 2 into high voltage. The electric power boosted to a high voltage by the step-up transformer 5 includes an LBS (air load switch) 6, a VCT (electric power meter transformer) 7 that takes out a signal of electric energy from the power line, and a PAS (pillar air switch). Connected to the high-voltage power system 9 via the device 8. The LBS (air load switch) 6 protects the step-up transformer 5 and its connecting wires by a fuse built in the high-voltage system in the event of a short circuit or a ground fault in the high-voltage system. In a device having a transformer capacity of 300 kVA or more, a VCB (vacuum circuit breaker) and a DS (disconnector) are required instead of the LBS (air load switch) 6. An electric energy meter 10 is connected to the VCT 7 and the amount of electric power transmitted to the electric power system is measured. A ventilation fan 12 is connected to the AC power via a power transformer 11.

  As shown in FIG. 2, the housing 13 is composed of rectangular parallelepiped boards 13a and 13b, and the power conditioner 2 and the ventilation fan are connected to the board 13a, the step-up transformer 5 and the LBS (air load switch). 6 is arranged on the line 13b.

  FIG. 2 is a view of the system interconnection device of the present embodiment as viewed from the back. FIG. 3 is a view of the system interconnection device of the present embodiment as viewed from the left side, and shows only the device arranged in the row 13b. In general, the power conditioner 2 is composed of electronic components such as an inverter 3 and needs to be protected from dust, high humidity and high temperature, whereas the step-up transformer 5 is exposed to dust, high humidity and high temperature. Used outdoors. Since the use conditions are different from each other in this way, the board is housed in a board using a partition, and the board cooling structure and method are selected for each board.

The row 13b has a natural heat dissipation structure with a sealed structure. Since the step-up transformer 5 is arranged so that the tank portion is exposed to the outside, the heat generated from the step-up transformer 5 is radiated to the outside of the panel, and there are devices such as an LBS (air load switch) 6. A structure in which the temperature inside the row 13b does not become high is used.
Wiring from the step-up transformer 5 to the LBS (air load switch) 6 can be made by connecting the bus duct connection flange on the upper side of the step-up transformer 5 arranged on the back side of the panel and the row board 13b.

  FIG. 4 is a front view of the system interconnection device of the present embodiment. FIG. 5 is a view of the system interconnection device of the present embodiment as viewed from the right side, and shows only the device arranged in the row 13a. The row board 13a has an exhaust ventilation fan 12 on the ceiling of the row board 13a, a power conditioner 2 near the center of the row board 13a, and a gallery 14 on the front and rear doors of the row board 13a. It has a cooling structure.

  In particular, since many electronic components are mounted on the inverter 3 that is a device in the power conditioner 2 and it is necessary to protect it from the heat generated from the reactor 4, the power conditioner 2 connects the inverter 3 to the panel 13a. The reactor 4 having a large amount of heat with respect to the other devices arranged in the power conditioner 2 is placed away from the inverter 3 with the lower floor on the back side.

  Further, in order to increase the suction efficiency from the lower panel inlet, it is necessary to increase the degree of sealing in the panel. Therefore, the frame connection part is connected by all welding, the number of bolt fastening points is reduced, and the confidentiality of the frame connection part is improved. For the packing at the contact portion between the door and the frame flange, a hollow packing with excellent weather resistance is used to improve the confidentiality of the door.

  Usually, as a heat shield structure outdoors, a heat shield structure such as a heat shield plate 16 is provided outside the panel (panel front and back) as shown in FIG. FIG. 9 shows the wind flow of the conventional structure of FIG. In the conventional structure, the gallery 14 is provided at the panel door portion for intake, but the intake air amount is limited because the heat shield plate 16 exists. For this reason, since air in a panel is forcedly discharged when exhausting by the ventilation fan 12, the ventilation fan 12 may be loaded and power consumption may increase.

In FIG. 6, the structural example about the thermal-insulation structure of Example 1 is shown.
In this embodiment, as shown in FIG. 6, the heat shield plate 16 attached to the outer surface of the panel is eliminated, and the heat shield duct 17 is attached inside the panel. The heat shield duct 17 extends along the door portions on the front and back of the panel, and is bent toward the ventilation fan 12 at the ceiling. For example, the shielding duct 17 is closed on the side surface and opened at the lower and upper portions, so that air can flow upward from the lower portion. And the heat insulation duct 17 is arrange | positioned in the space before and behind the row | line | column 13a and the power conditioner 2, and about the intake, it performs using the intake duct 18 provided in the lower part. A gallery 14 is provided outside the intake duct 18. Reference numeral 15 denotes an inverter upper fan disposed on the upper portion of the inverter 3.

  FIG. 7 shows the flow of wind in this embodiment structure. The intake duct 18 needs two intake routes for cooling the internal equipment of the row board 13a and venting to the heat shield duct 17. Therefore, the wind direction plate 19 is attached in the intake duct 18. With this wind direction plate, it becomes possible to divide the flow of wind in the intake duct 18 into two directions: the internal equipment direction and the heat shield duct direction. A part of the wind sucked from the intake duct 18 rises through the heat shield duct 17 and is discharged from the ventilation fan 12 to the outside. Moreover, a part of the sucked air cools internal devices such as the power conditioner 2 and is discharged from the ventilation fan 12 to the outside.

  The heat shield duct 17 is attached by, for example, fastening with a hinge provided on one side, and sealing and fixing each side with packing. Alternatively, a hole may be provided in the door, and the hole may be bent so as to be integrated with the door.

  As a result, two types of wind, that is, air that has cooled the inside of the housing and air that passes through the inside of the heat shield duct 17, can be discharged from the exhaust fan 12 to the outside of the panel. And since the wind sucked from the outside through the shielding duct provided on the whole or part of the door part flows, heat can be effectively shielded, and the temperature rise inside the device due to external factors of the device such as sunlight. It becomes possible to suppress.

  Further, by removing the heat shield plate 16, the exposed area of the gallery 14 can be increased. As a result, it is possible to reduce the load on the ventilation fan 12 and to reduce power consumption, thereby extending the life of the device.

  In Example 2, the heat shield structure of the present invention is provided on the side of the panel. In FIG. 10, the structural example at the time of providing the thermal-insulation structure of a present Example in the board side surface is shown. In the present embodiment, when the panel has the same structure as that of the first embodiment, the heat shield plate 16 attached to the outer surface of the panel is eliminated as shown in FIG. 10, and the heat shield duct 17 is attached inside the panel. The heat shield duct 17 rises from the lower part toward the upper part along the board side surface, and is bent toward the ventilation fan 12 at the upper part. An intake duct 18 is provided at the lower part of the side of the panel, and a gallery 14 is provided outside the intake duct 18.

  In FIG. 11, the flow of the wind of a present Example is shown. A wind direction plate 19 is attached to the inside of the intake duct 18, and the wind direction plate 19 divides the flow of wind sucked from the outside into two directions, that is, the internal device direction and the heat shield duct direction. The flow that has risen along the heat shield duct 17 flows toward the ventilation fan 12 at the top, and is discharged from the ventilation fan 12 to the outside. Further, the flow toward the internal device cools the power conditioner 2 and the like and is discharged from the ventilation fan 12 to the outside.

  According to the present embodiment, the heat shielding duct 17 is disposed near the power conditioner 2 by arranging the heat shielding duct 17 on the side surface portion of the switchboard, so that air outside the panel can be supplied to the intake duct 18. The cooling efficiency is higher than in Example 1. That is, by blocking the warmed air near the board and the air supplied from the intake duct 18, the outside air can be taken in efficiently. As a result, it is possible to reduce the load on the ventilation fan 12 and to reduce power consumption, thereby extending the life of the device.

Further, by disposing the heat shielding duct 17 on the side surface, the standing area in the depth direction can be reduced, and the distribution board can be easily arranged.
When the heat shield duct 17 is disposed only on the side surface portion, the heat shield duct 17 is not provided at the door portion of the front portion, so that the work efficiency when the door is opened and the power conditioner 2 and the like are maintained is improved.
If the heat insulation duct 17 is arrange | positioned in the south side where sunlight is illuminated among the installed switchboards, cooling efficiency will rise further. This is because the south side of the switchboard that is exposed to sunlight is likely to generate heat.
Moreover, when there exists another heat generating apparatus in the vicinity of a switchboard, it is good to arrange | position the heat insulation duct 17 in the said heat generating apparatus side.

Furthermore, as a modification, a configuration in which the heat shield duct 17 of the first embodiment is arranged on the front and the back and a configuration in which the heat shield duct 17 of the second embodiment is arranged on the side are adopted, and both the front, the rear and the side are adopted. It is also possible to arrange them. In the case where the front side and the first side surface adjacent to the front side face the south side, the heat shield duct 17 may be arranged on the front side and the first side surface. In this case, the heat shield duct 17 may not be disposed on the second side surface (the surface facing the first side surface) adjacent to the front surface and the back surface.
Further, depending on the arrangement state of the switchboard, the heat shield duct 17 may be arranged only on the front surface or the first side surface. Also in this case, outside air can be efficiently taken from the intake duct 18 and the power conditioner 2 can be efficiently cooled.
Furthermore, it is also possible to provide the heat shielding duct 17 on all of the front, first side, second side and back of the switchboard.

  In the third embodiment, the gallery 14 is divided into a heat shield duct and an internal device. FIG. 12 shows a configuration example in which the intake route is changed based on the duct structure used in the first and second embodiments. In this embodiment, taking advantage of the fact that the gallery 14 is installed in two stages, upper and lower, two intake routes are provided. As shown in FIG. 12, the gallery 14a installed in the upper stage is dedicated to intake air to the heat shield duct 17, and the gallery 14b installed in the lower stage is dedicated to cooling in the panel. Thereby, it becomes possible to make two wind flows without using the wind direction plate 19 in the first and second embodiments.

  FIG. 13 shows the flow of wind in this embodiment structure. The outside air drawn in by the gallery 14a rises through the heat shield duct 17 and is guided to the exhaust ventilation fan 12 at the top of the panel at the upper part. Moreover, the outside air sucked by the gallery 14b rises while cooling internal devices such as a power conditioner and is guided to the exhaust ventilation fan 12 at the ceiling of the panel. As a result, two types of wind can be discharged from the exhaust ventilation fan 12 to the outside of the panel.

  According to the present embodiment, by dividing the gallery 14 for the heat shield duct and the internal device, a wind direction plate is not required, and cooling air can be reliably supplied to the heat shield duct and the internal device.

DESCRIPTION OF SYMBOLS 1 ... Solar cell module 2 ... Power conditioner 3 ... Inverter (power conversion circuit)
4 ... Reactor 5 ... Step-up transformer 6 ... LBS (air load switch)
7 ... VCT (Transformer for electricity supply and demand instrument)
8… PAS (post air switch)
DESCRIPTION OF SYMBOLS 9 ... High voltage electric power system 10 ... Electricity meter 11 ... Power supply transformer 12 ... Ventilation fan 13 ... Housing | casing 13a, 13b ... Row board 14 ... Ventilation opening (gallery)
14a, 14b ... Ventilation port (gallery) up and down 15 ... Inverter upper fan 16 ... Heat shield (heat shield panel)
17 ... Thermal insulation duct 18 ... Intake duct 19 ... Wind direction plate

Claims (15)

A power conditioner having an inverter and a reactor that convert the generated DC power into AC power; and
A step-up transformer that converts AC power output from the power conditioner into high-voltage power;
A circuit breaker disposed between the step-up transformer and the existing high-voltage power system,
A system interconnection device for supplying generated power to a high-voltage power system,
A ventilation fan placed on the ceiling of the device;
A heat shield duct placed inside the wall of the device;
An intake opening disposed at a lower portion of the wall surface,
The grid connection device, wherein the heat insulation duct rises upward from the lower part along the entire surface or a part of the wall surface, and is bent toward the ventilation fan at a ceiling part. In the grid connection apparatus according to claim 1,
A part of the wind sucked from the intake opening rises through the heat shield duct and is discharged from the ventilation fan to the outside.
The other part of the wind sucked from the intake opening cools internal equipment including the power conditioner and is discharged from the ventilation fan to the outside. In the grid connection apparatus according to claim 1,
An air intake duct is provided at a lower portion of the wall surface, and a wind direction plate is disposed in the air intake duct.
The wind direction plate distributes the wind sucked from the intake opening to the shielding duct direction and the internal equipment direction, and is a system interconnection device. In the grid connection apparatus according to claim 1,
The grid connection device, wherein the heat shielding duct is provided on a front surface of the device and / or a back surface of the device. In the grid connection apparatus according to claim 1,
The grid connection device, wherein the heat shielding duct is provided at least on a side surface of the device. In the grid connection apparatus according to claim 2,
The intake opening includes an opening for a shielding duct and an opening for an internal device,
The wind sucked from the opening for the shielding duct rises through the heat shielding duct and is discharged from the ventilation fan to the outside.
The system interconnection device characterized in that the wind sucked from the opening for the internal device cools the internal device including the power conditioner and is discharged to the outside from the ventilation fan. In the grid connection apparatus according to claim 1,
An apparatus for system interconnection characterized in that a panel constituting the casing of the apparatus has a partition inside, and the power conditioner and the ventilation fan are arranged in the same panel. In the system interconnection device according to claim 7,
The system interconnection device, wherein the inverter and the reactor are arranged apart from each other in the same panel. A power conditioner having an inverter and a reactor that convert the generated DC power into AC power; and
A step-up transformer that converts AC power output from the power conditioner into high-voltage power;
A switchboard comprising a circuit breaker disposed between the step-up transformer and an existing high-voltage power system,
A ventilation fan placed on the ceiling of the panel;
A heat-insulating duct placed inside the panel wall;
An intake opening disposed at a lower portion of the panel wall surface,
The distribution board characterized in that the heat insulation duct rises upward from the bottom along the entire or part of the wall surface of the panel, and is bent toward the ventilation fan at the ceiling. The switchboard according to claim 9,
A part of the wind sucked from the intake opening rises through the heat shield duct and is discharged from the ventilation fan to the outside.
The other part of the wind sucked from the intake opening cools internal equipment including the power conditioner and is discharged from the ventilation fan to the outside. The switchboard according to claim 9,
An air intake duct is provided at a lower portion of the panel wall surface, and a wind direction plate is disposed in the air intake duct.
The switchboard is characterized in that the wind direction plate distributes the wind sucked from the intake opening to the shielding duct direction and the internal device direction. The switchboard according to claim 9,
The distribution board characterized in that the heat insulation duct is provided on the front and / or back of the panel. The switchboard according to claim 9,
The heat distribution duct is provided on at least a side surface of the panel. The switchboard according to claim 10,
The intake opening includes an opening for a shielding duct and an opening for an internal device,
The wind sucked from the opening for the shielding duct rises through the heat shielding duct and is discharged from the ventilation fan to the outside.
The wind blown from the opening for the internal device cools the internal device including the power conditioner and is discharged to the outside from the ventilation fan. A switchboard having a power conditioner,
A ventilation fan that blows the air inside the switchboard to the outside at the top, and an opening that connects the inside and the outside of the switchboard at the bottom,
The power conditioner has an inverter mounted on the first wall surface,
Between the inner wall surface of the switchboard and the first wall surface, a second wall surface is provided,
The switchboard characterized in that air flowing from the opening toward the ventilation fan flows between the inner wall surface and the second wall surface and between the first wall surface and the second wall surface. .

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