JP6411189B2 - Inverter - Google Patents

Description

  The present invention relates to a power conditioner.

  2. Description of the Related Art Conventionally, a power conditioner that converts DC power generated by a solar cell or the like into AC power and supplies it to an electric power system has been developed.

  Since the power conditioner needs to be connected to a solar cell and a power system, it is necessary to perform wiring work at the time of installation. Generally, the wiring is drawn into the storage panel from the wiring port provided in the storage panel of the power conditioner and connected. In order to improve the work efficiency, all the doors on the front side of the storage board are opened and the work is performed. For example, Patent Document 1 describes an invention that facilitates connection work of wiring inside a storage board, and describes that all double-open front doors are opened when wiring is performed.

JP-A-8-19121

  However, when the power conditioner is directly arranged in a salt damage area such as near the coast, the inside of the storage panel is exposed to salty outside air during the installation work.

  The present invention has been conceived under the circumstances described above, and provides a power conditioner that can suppress the inside of a storage panel from being exposed to the outside air as much as possible without reducing work efficiency. That is the purpose.

  In order to solve the above problems, the present invention takes the following technical means.

  The power conditioner provided by the 1st side of the present invention is provided with the storage panel sealed and the inverter circuit stored in the storage panel, and the storage panel was provided with the opening in the front. A housing, a door disposed in the opening, and a wiring port for passing wiring disposed on an upper surface or a bottom surface of the housing on the back of the door, and viewing the housing from the front side. The left and right dimensions are substantially the same for the door and the wiring port.

  In a preferred embodiment of the present invention, the power conditioner further includes a second door disposed in the opening.

  The power conditioner provided by the second aspect of the present invention includes a storage cabinet that is hermetically sealed and an inverter circuit that is stored in the storage cabinet, and the storage cabinet is provided with an opening in the front. A housing, a door disposed in the opening, a second door disposed in the opening, and a wiring port for passing wiring disposed on the top or bottom surface of the housing behind the door When the housing is viewed from the front side, the left and right dimensions are substantially the same between the door and the wiring port, or the door is larger than the wiring port, and the door and the first It is characterized by being different from the door of No.2.

  In a preferred embodiment of the present invention, the power conditioner further includes a circuit breaker for cutting off the connection between the inverter circuit and a DC power source or a power system, and the circuit breaker includes the storage board. It arrange | positions in the position facing the back surface of the said inside door.

  In a preferred embodiment of the present invention, the power conditioner further includes an operation panel arranged at a location other than the door, in front of the storage board.

  In a preferred embodiment of the present invention, the vertical dimension of the door is smaller than the vertical dimension of the storage board.

  In a preferred embodiment of the present invention, the power conditioner includes an input side wiring port and an output side wiring port as the wiring port, and includes an input side door and an output side door as the door. The input side wiring port is disposed behind the input side door, and the output side wiring port is disposed behind the output side door.

  In a preferred embodiment of the present invention, the horizontal dimension of the input side wiring port when the casing is viewed from the front side is larger than the horizontal dimension of the output side wiring port.

  According to the present invention, the wiring port is disposed on the back of the door, and the width of the door is matched to the width of the wiring port. Therefore, wiring work can be performed by opening only the door. Thereby, the open part at the time of wiring work can be made small, without reducing working efficiency. Therefore, even when the power conditioner B is installed in a salt damage area, the inside of the storage board 6 can be prevented from being exposed to the outside air containing salt.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a figure which shows the circuit structure of the power conditioner which concerns on 1st Embodiment. It is a figure which shows the external appearance of the power conditioner which concerns on 1st Embodiment. It is the schematic of the state which opened the door of the power conditioner which concerns on 1st Embodiment. It is the IV-IV sectional view taken on the line in Fig.2 (a). (A) is the Va-Va sectional view taken on the line in FIG. 4, (b) is the Vb-Vb sectional view in FIG. 4, (c) is the Vc-Vc sectional view in FIG. 5 (b). . It is the VI-VI sectional view taken on the line in Fig.2 (a). It is another Example of the power conditioner which concerns on 1st Embodiment. It is another Example of the power conditioner which concerns on 1st Embodiment. It is another Example of the power conditioner which concerns on 1st Embodiment. It is a figure for demonstrating the power conditioner which concerns on 2nd Embodiment.

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

  FIG. 1 is a diagram illustrating a circuit configuration of the power conditioner according to the first embodiment.

  FIG. 1A shows the overall configuration of the power conditioner B. The power conditioner B converts DC power input from the DC power source A into AC power and outputs the AC power to a connected load or power system C. Further, the power conditioner B also has a function of disconnecting the connection with the power system C when an abnormality such as overvoltage or single operation is detected. As shown in FIG. 1A, the power conditioner B includes a DC circuit breaker 1, an inverter circuit 2, a filter 3, an AC circuit breaker 4, and a control device 5. In the present embodiment, the power conditioner B includes two units (parts surrounded by a broken line in FIG. 1A) including the DC circuit breaker 1, the inverter circuit 2, the filter 3, and the AC circuit breaker 4. . Each unit receives DC power from DC power supply A, converts it into AC power, and outputs it. Two units may be connected in parallel and connected to one DC power source A. In FIG. 1A, the description of each component of one unit (lower unit) is omitted.

  The direct current power source A outputs direct current power and includes, for example, a solar battery. A solar cell generates direct-current power by converting solar energy into electrical energy. In the present embodiment, the DC power source A is obtained by connecting a plurality of solar cell arrays to which a plurality of solar cell modules are connected. The DC power source A outputs the generated DC power to the inverter circuit 2. Note that the DC power source A is not limited to one that generates DC power from a solar cell. For example, the DC power source A may be a fuel cell, a storage battery, an electric double layer capacitor, a lithium ion battery, or AC power generated by a diesel engine generator, a micro gas turbine generator, a wind turbine generator, or the like. It may be a device that converts to DC power and outputs it.

  The inverter circuit 2 converts DC power input from the DC power source A into AC power and outputs the AC power. The inverter circuit 2 is a three-phase PWM control type inverter. The inverter circuit 2 converts the DC power input from the DC power source A into AC power by switching each switching element on and off based on the PWM signal input from the control device 5.

  As shown in FIG. 1B, the inverter circuit 2 includes six switching elements SW1 to SW6, six free wheel diodes, three snubber circuits C1 to C3, and a smoothing capacitor C. In the present embodiment, IGBTs (Insulated Gate Bipolar Transistors) are used as the switching elements SW1 to SW6. Note that the switching elements SW1 to SW6 are not limited to IGBTs, and may be bipolar transistors, MOSFETs, reverse blocking thyristors, or the like. Further, the types of the return diode, the snubber circuits C1 to C3, and the capacitor C are not limited.

  The switching elements SW1 and SW4 are connected in series by connecting the emitter terminal of the switching element SW1 and the collector terminal of the switching element SW4. The collector terminal of the switching element SW1 is connected to the positive side of the DC power source A, and the emitter terminal of the switching element SW4 is connected to the negative side of the DC power source A to form a bridge structure. Similarly, the switching elements SW2 and SW5 are connected in series to form a bridge structure, and the switching elements SW3 and SW6 are connected in series to form a bridge structure. PWM signals output from the control device 5 are input to the gate terminals of the switching elements SW1 to SW6, respectively. The bridge structure formed by the switching elements SW1 and SW4 is a U-phase arm, the bridge structure formed by the switching elements SW2 and SW5 is a V-phase arm, and the bridge structure formed by the switching elements SW3 and SW6 is a W-phase arm. Phase arm. The U-phase output line is connected to the connection point between the switching elements SW1 and SW4 of the U-phase arm, and the V-phase output line is connected to the connection point between the switching elements SW2 and SW5 of the V-phase arm. A W-phase output line is connected to a connection point between the arm switching elements SW3 and SW6. Each of the switching elements SW1 to SW6 can be switched between an on state and an off state based on the PWM signal.

  The free-wheeling diodes are connected in antiparallel between the collector terminals and the emitter terminals of the switching elements SW1 to SW6, respectively. That is, the anode terminal of the return diode is connected to the emitter terminals of the switching elements SW1 to SW6, respectively, and the cathode terminal of the return diode is connected to the collector terminals of the switching elements SW1 to SW6, respectively. The free-wheeling diode is for preventing a high reverse voltage due to the counter electromotive force generated by switching the switching elements SW1 to SW6 from being applied to the switching elements SW1 to SW6.

  Snubber circuit C1 is connected in parallel to both ends of the U-phase arm. Similarly, the snubber circuit C2 is connected in parallel to both ends of the V-phase arm, and the snubber circuit C3 is connected in parallel to both ends of the W-phase arm. In the present embodiment, the snubber circuits C1 to C3 are each configured by connecting six capacitors in three series and two in parallel. The snubber circuits C1 to C3 are for absorbing a surge voltage generated during switching.

  In the present embodiment, the switching elements SW1 and SW4 and the free wheeling diode are arranged in the power conditioner B as one IGBT module. Similarly, the IGBT module including the switching elements SW2 and SW5 and the free wheel diode and the IGBT module including the switching elements SW3 and SW6 and the free wheel diode are also arranged in the power conditioner B. A heat sink is attached to each IGBT module. Snubber circuits C1 to C3 are also connected to each IGBT module. In the internal arrangement of the power conditioner B described below, these IGBT modules and snubber circuits are collectively described as the inverter circuit 2. In this embodiment, since two units are provided, the power conditioner B includes two inverter circuits 2.

  In addition, the structure of the inverter circuit 2 is not limited to the above, For example, a multilevel inverter etc. may be sufficient.

  The filter 3 removes a high-frequency component due to switching from the output of the inverter circuit 2, and is a low-pass filter including a reactor 31 and a capacitor 32. Since the output of the inverter circuit 2 is three-phase, the filter 3 includes three reactors 31 and three capacitors 32. In the present embodiment, since two units are provided, the power conditioner B includes six reactors 31 and six capacitors 32. The six capacitors 32 are arranged in the power conditioner B as a single module. In the internal arrangement of the power conditioner B described below, the module is described as the capacitor 32. Yes.

  The DC breaker 1 cuts off the connection between the power conditioner B and the DC power source A. The DC circuit breaker 1 is normally closed, and the power conditioner B is connected to the DC power source A. However, when an abnormality of the DC power source A is detected, the DC circuit breaker 1 is opened based on the cutoff signal from the control device 5, and the connection between the power conditioner B and the DC power source A is cut off. In the present embodiment, since two units are provided, the power conditioner B includes two DC circuit breakers 1.

  The AC circuit breaker 4 cuts off the connection between the power conditioner B and the power system C. The AC circuit breaker 4 is normally closed, and the power conditioner B is connected to the power system C. However, when a system voltage abnormality or islanding operation is detected, the AC circuit breaker 4 is opened based on the shut-off signal from the control device 5, and the connection between the power conditioner B and the power system C is shut off. The In this embodiment, since two units are provided, the power conditioner B includes two AC circuit breakers 4.

  The control device 5 controls the power conditioner B. The control device 5 generates a PWM signal based on signals input from each current sensor and each voltage sensor and outputs the PWM signal to the inverter circuit 2. Further, an abnormality is detected from each signal, and a disconnection signal is output to the DC circuit breaker 1 or the AC circuit breaker 4 to disconnect the connection. In the internal arrangement of the power conditioner B described below, a circuit for controlling the inverter circuit 2 of each unit in the control device 5 is provided for each control device 5 (in the present embodiment, two units are provided). Therefore, there are two control devices 5).

  Next, the external appearance, internal structure, and internal arrangement of the power conditioner B will be described with reference to FIGS.

  FIG. 2 is a diagram illustrating an external appearance of the power conditioner B. FIG. FIG. 4A is a perspective view seen from the front side, and FIG. 4B is a perspective view seen from the back side. The surface on which the door is provided is the front. FIG. 3 is a schematic view of the door opened. 4 to 6 are schematic cross-sectional views of the power conditioner B. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. Fig.5 (a) is the Va-Va sectional view taken on the line in FIG. FIG. 5B is a cross-sectional view taken along the line Vb-Vb in FIG. FIG. 5C is a cross-sectional view taken along the line Vc-Vc in FIG. 6 is a cross-sectional view taken along line VI-VI in FIG.

  The power conditioner B is installed in, for example, a solar power plant, and is not directly installed in the outdoor storage panel but directly installed outdoors. Also, considering that it is installed in a salt damage area near the coast, it is operated in a sealed state so that outside air does not enter inside.

  The power conditioner B includes a storage board 6 (see FIG. 2). The storage board 6 has doors 61 to 64 attached to a box-shaped housing whose front side is open. The DC circuit breaker 1, the inverter circuit 2, the filter 3, the AC circuit breaker 4, the control device 5, and the like described above are disposed inside the storage panel 6. In this embodiment, the housing | casing and the doors 61-64 which comprise the storage board 6 are metal, such as stainless steel, for example. In addition, the raw material of the storage board 6 is not limited to a metal, What is necessary is just what has predetermined intensity | strength and can ensure sealing property. For example, it may be made of synthetic resin such as carbon-fiber-reinforced plastic (CFRP).

  An input-side wiring port 67 and an output-side wiring port 68 are provided on the bottom surface of the storage board 6 (the lower surface in FIG. 2A). In FIG. 2A, since it is not actually visible, it is indicated by a broken line. The input side wiring port 67 is a hole for drawing in the input side wiring (wiring connected to the DC power source A) from the outside of the storage board 6. The output-side wiring port 68 is a hole for drawing output-side wiring (such as wiring connected to the power system C) from the outside of the storage board 6. Since there are more input side wirings than output side wirings, the input side wiring port 67 is wider than the output side wiring port 68. The input-side wiring port 67 and the output-side wiring port 68 are closed so that there is no gap after wiring is passed.

  The door 61 and the door 62 are attached to the left side of the front surface of the housing of the storage board 6 so that so-called double doors can be opened. That is, the door 61 is fixed to the left end position of the housing opening of the storage board 6 so as to be rotatable about the left end side as an axis. Further, the door 62 is fixed to a central position in the left-right direction of the housing opening of the storage board 6 so as to be rotatable about the right end side. The door 63 and the door 64 are attached to the right side of the front surface of the housing of the storage board 6 so that so-called double doors can be opened. That is, the door 63 is fixed at the center in the left-right direction of the housing opening of the storage board 6 so as to be rotatable about the left end side as an axis. The door 64 is fixed to the right end position of the housing opening of the storage board 6 so as to be rotatable about the right end side. 3A shows a state where the doors 61 to 64 are opened, and FIG. 3A shows a state where the door 61 and the door 63 are closed and the door 62 and the door 64 are opened.

  The output-side wiring port 68 is disposed behind the door 62, that is, on the front side of the bottom surface of the storage board 6 and on the left side from the center in the left-right direction. The input side wiring port 67 is disposed behind the door 64, that is, at the right end on the near side of the bottom surface of the storage board 6. In the present embodiment, the width dimension of the door 62 (the dimension in the left-right direction in FIG. 2A) is smaller than the width dimension of the door 61. This is because the width dimension of the door 62 is matched to the width dimension of the output side wiring port 68. In the present embodiment, the width dimension of the door 64 is larger than the width dimension of the door 63. This is because the width dimension of the door 64 is adjusted to the width dimension of the input side wiring port 67. Further, when the doors 61 to 64 are closed, there is no gap between the doors 61 and 64 and the housing of the storage board 6.

  A roof 65 is disposed on the upper surface of the storage board 6 (upper surface in FIG. 2A). The roof 65 includes a heat insulating material, and suppresses heat from direct sunlight from being transmitted to the upper surface of the storage board 6. A stand 66 is disposed between the bottom surface of the storage board 6 and the ground. That is, the storage board 6 is installed on a stand 66 installed on the ground. The stand 66 fixes the storage board 6 and suppresses heat from the ground from being transmitted to the bottom surface of the storage board 6. An operation panel 69 is attached to the door 63. Actually, an operation panel containing the operation panel 69 is attached. When the operation panel 69 is not operated, the operation panel door is closed, and when the operation panel 69 is operated, the operation panel door is opened. Operate in the state. In FIG. 2A, the operation panel is omitted. 2A, the operation panel 69 may be directly attached to the door 63 without providing the operation panel. Further, the operation panel 69 may be attached to the door 61.

  As shown in FIG. 2B, four rectangular holes are provided below the back surface of the storage board 6, and a heat exchanger 7 is fitted in each hole. That is, four heat exchangers 7 are attached to the storage board 6. In the manufacturing process of the inverter B, the heat exchanger 7 is attached last. Until the heat exchanger 7 is attached, attachment work and adjustment work of members arranged on the back side inside the storage board 6 can be performed from the four rectangular holes provided in the storage board 6. Each heat exchanger 7 is attached so as to completely close the rectangular hole of the storage board 6 (so that there is no gap).

  The heat exchanger 7 is for cooling the air inside the storage panel 6. The heat exchanger 7 sucks the air inside the storage panel 6 and dissipates heat to the air sucked from the outside to lower the temperature. Discharge. As shown in FIG. 4, the inside of the heat exchanger 7 is divided into a heat receiving space 72 and a heat radiating space 73 by a heat radiating member 71. In the heat receiving space 72, the air inside the storage board 6 is sucked from the internal suction port 72a and discharged from the internal discharge port 72b (see the one-dot chain line arrow shown in FIG. 4). A fan is provided in the internal suction port 72a, and the air inside the storage panel 6 is sucked into the heat receiving space 72 from the internal suction port 72a by the fan, and the air inside the heat receiving space 72 is stored in the storage panel from the internal discharge port 72b. 6 is discharged inside. The fan may be provided in the internal discharge port 72b instead of or in addition to the internal suction port 72a. Outside air is sucked into the heat radiation space 73 from the external suction port 73a and is discharged from the external discharge port 73b (see the one-dot chain line arrow on the right side shown in FIG. 4). A fan is provided in the external suction port 73a, and outside air is sucked into the heat dissipation space 73 from the external suction port 73a, and air inside the heat dissipation space 73 is discharged to the outside from the external discharge port 73b. The fan may be provided in the external discharge port 73b instead of or in addition to the external suction port 73a. The heat of the air inside the storage board 6 sucked into the heat receiving space 72 is discharged to the outside air sucked into the heat radiating space 73 by the heat radiating member 71. The air in the heat receiving space 72 whose temperature has decreased due to heat dissipation is discharged into the storage panel 6. In practice, the heat radiating member 71, the heat receiving space 72, and the heat radiating space 73 have complicated shapes so that the heat energy can be exchanged more efficiently. However, in FIG. .

  Inside the heat exchanger 7, the heat receiving space 72 and the heat radiating space 73 are separated by the heat radiating member 71, so that the outside air does not enter the heat receiving space 72, and the outside air is stored via the heat exchanger 7. There is no intrusion into the board 6. Further, the input-side wiring port 67 and the output-side wiring port 68 are closed so that there is no gap after the wiring is passed. After the inverter B is installed, the doors 61 to 64 are closed except during maintenance or when a failure occurs. When the doors 61 to 64 are closed, there is no gap between the doors 61 and 64 and the housing of the storage board 6. Therefore, when the doors 61 to 64 are closed during operation of the power conditioner B or the like, the storage panel 6 is hermetically sealed, so that outside air, dust, dust, and the like do not enter inside.

  As shown in FIG. 4, a circulation guiding member 8 is disposed inside the storage board 6. The circulation guide member 8 is for circulating the air flow inside the storage board 6. The circulation guide member 8 is formed by fixing one end of a rectangular plate-shaped first member 8a to one surface of a rectangular plate-shaped second member 8b so as to be substantially orthogonal to each other, and has a substantially cross-sectional shape. It is T-shaped. In the present embodiment, the circulation guide member 8 is made of metal such as steel, like the storage board 6. Note that the material of the circulation guide member 8 may not be the same as that of the storage board 6, and may be, for example, a synthetic resin.

  The circulation guide member 8 is such that the second member 8b is substantially parallel to the front surface of the storage board 6, and the other end of the first member 8a is located between the internal suction port 72a and the internal discharge port 72b. And is fixed to the storage board 6 so as to be in contact with the heat exchanger 7. Clearances are respectively provided between the upper end of the second member 8b and the inside of the upper surface of the storage board 6 and between the lower end of the second member 8b and the inside of the bottom surface of the storage board 6.

  Further, the side ends of the circulation guide member 8 (the left end and the right end as viewed from the front of the storage board 6 when placed on the storage board 6) are the side surfaces of the storage board 6 (the left and right surfaces in FIG. ) On the inside. If there is a gap between the side end of the circulation guide member 8 and the inside of the side surface of the storage board 6, the cooled air discharged from the internal discharge port 72b is drawn into the internal suction port 72a through the gap. This is because the function of cooling the inside of the storage board 6 is reduced. In the present embodiment, since the housing of the storage board 6 is formed by fixing the outer wall to a frame assembled in a rectangular parallelepiped shape, the side end of the second member 8b is the center inside the side surface of the storage board 6. The frame 91 is in contact with the vertical frame 91. However, the side end of the first member 8a cannot contact the inside of the side surface of the storage board 6 (see FIG. 5B). Therefore, between the two frames between the side end of the first member 8a and the inside of the side surface of the storage board 6 (the frame 91 and the vertical frame on the back side inside the side surface of the storage board 6), The gap frame 92 is arranged so that no gap is formed (see FIGS. 5B and 5C). In the present embodiment, the gap frame 92 is a square frame having the same cross section as the other frames, but is not limited thereto. As long as there is no gap, the frame may have a U-shaped cross section, an angle with an L-shaped cross section, or a plate. It should be noted that there should be no gap between the side end of the circulation guide member 8 and the inside of the side surface of the storage board 6, so that the gap 92 is not disposed but the side end of the first member 8 a is stored. The side end of the first member 8a may protrude from the side end of the second member 8b so that the inside of the side surface of the board 6 is in direct contact.

  The first member 8a separates the internal discharge port 72b and the internal suction port 72a of the heat exchanger 7 so that the cooled air discharged from the internal discharge port 72b is immediately sucked into the internal suction port 72a. Play a role in preventing. The second member 8b divides the interior of the storage board 6 into a front side and a back side, forms an air flow path (see the broken line arrow shown in FIG. 4), and discharges air discharged from the internal discharge port 72b. It plays a role of circulating in the storage board 6.

  The fan provided in the internal suction port 72a of the heat exchanger 7 is always operating. Thereby, the air in the storage board 6 is circulated. On the other hand, the fan provided in the external suction port 73a operates only while the temperature inside the storage panel 6 is equal to or higher than a predetermined temperature, and during this time, the air inside the storage panel 6 is cooled. As a result, when the temperature inside the storage panel 6 is low, it is possible to prevent outside air from being taken into the heat radiation space 73 of the heat exchanger 7 and to prevent contamination of a filter (not shown) provided in the external suction port 73a. can do. Note that the fan provided in the external suction port 73a may also be operated at all times.

  As shown in FIG. 4, the reactor 31 is disposed near the back of the lowermost part of the storage board 6. The reactor 31 is the member that needs the most cooling because it generates a large amount of heat and tends to increase in temperature. Therefore, it arrange | positions near the internal discharge port 72b so that the air discharged | emitted from the internal discharge port 72b of the heat exchanger 7 may contact | win first. Moreover, since the reactor 31 is heavy, it is meaningful to arrange the reactor 31 at the lowermost part of the storage board 6 in order to stabilize the power conditioner B by lowering the center of gravity. As described above, the power conditioner B includes six reactors 31. In the present embodiment, as shown in FIG. 5A, the six reactors 31 are arranged in a row at intervals in the horizontal direction when viewed from the front side of the storage board 6. Further, the longitudinal direction of each reactor 31 is substantially parallel to the direction in which air is discharged from the internal discharge port 72 b of the heat exchanger 7, and the air discharged from the internal discharge port 72 b easily passes between the reactors 31. It is like that. Thereby, it can suppress that the flow path of the air discharged | emitted from the internal discharge port 72b is obstruct | occluded by the reactor 31, and the flow volume of air decreases.

  As described above, in the present embodiment, the power conditioner B includes two units. Three reactors 31 of one unit (hereinafter referred to as “first unit”) are arranged on the left side when viewed from the front side of the storage board 6, and the other unit (hereinafter referred to as “second unit”). 3 ”are arranged on the right side when viewed from the front side of the storage board 6. As will be described later, since the inverter circuit 2 of the first unit is arranged on the left side and the inverter circuit 2 of the second unit is arranged on the right side, the wiring between each reactor 31 of the first unit and the inverter circuit 2, and The wiring between each reactor 31 of the second unit and the inverter circuit 2 can be shortened. Further, in each reactor 31, the connection terminal 31 a for connecting to the inverter circuit 2 is on the back side of the storage panel 6, and the connection terminal 31 b for connecting to the AC circuit breaker 4 is on the front side of the storage panel 6. (See FIG. 6). Therefore, it is possible to shorten the wiring for connecting each reactor 31 and the inverter circuit 2 arranged on the back side surface of the second member 8b of the circulation guide member 8 (the back side surface of the storage board 6). it can. Moreover, shortening the wiring for connecting each reactor 31 and the AC circuit breaker 4 arrange | positioned at the surface (surface of the front side of the storage board 6) of the 2nd member 8b of the circulation induction member 8 Can do.

  As shown in FIG. 5A, the capacitor 32 (a module in which six capacitors 32 are combined into one) is disposed closer to the front of the left end when viewed from the front of the lowermost part of the storage board 6. Since the capacitor 32 needs to be connected to each reactor 31, the capacitor 32 is disposed in the vicinity of the reactor 31. In addition, you may make it arrange | position between the input side wiring port 67 and the output side wiring port 68. FIG.

  The inverter circuit 2 (IGBT module and snubber circuit) is disposed on the back surface of the second member 8b of the circulation guide member 8 as shown in FIG. A heat sink 21 is attached to the inverter circuit 2 (IGBT module), and a blower fan 22 for blowing air to the heat sink 21 is disposed above the heat sink 21. When the blower fan 22 blows air toward the heat sink 21 below, the flow rate of the air circulating inside the storage board 6 becomes larger. In addition, since there is an air flow by the fan provided in the internal suction port 72a of the heat exchanger 7, the blower fan 22 may not be provided. The air whose temperature has been increased by removing heat from the reactor 31 is radiated to the storage panel 6, so that the temperature is moderately reduced when reaching the heat sink 21. Therefore, heat can be taken away by the heat sink 21. The air whose temperature has been increased by taking heat away from the heat sink 21 is sucked from the internal suction port 72 a and cooled by the heat exchanger 7. Since the inverter circuit 2 is provided for each unit, the storage board 6 is provided with two inverters. The inverter circuit 2 of the first unit is disposed on the left side when viewed from the front of the storage panel 6, and the inverter circuit 2 of the second unit is disposed on the right side when viewed from the front of the storage panel 6.

  As shown in FIG. 4, the control device 5 is disposed on the front surface of the second member 8 b of the circulation guide member 8. As shown in FIG. 3, the control device 5 that controls the inverter circuit 2 of the first unit is arranged on the left side when viewed from the front of the storage board 6, and controls to control the inverter circuit 2 of the second unit. The device 5 is arranged on the right side when viewed from the front of the storage board 6. Thereby, the wiring between each inverter circuit 2 and the control device 5 can be shortened. Note that the control devices 5 may be combined into one to control the two inverter circuits 2.

  As shown in FIG. 3, the DC circuit breaker 1 (both the first unit and the second unit) is located on the front surface of the second member 8 b of the circulation guide member 8 so as to face the rear surface of the closed door 64. Has been placed. This makes it easy to connect input-side wiring (such as wiring connected to the DC power source A) drawn from the input-side wiring port 67 (see FIG. 2A) provided on the bottom surface of the storage board 6. Yes. Moreover, since the width dimension of the door 64 is matched with the width dimension of the input side wiring port 67 and the DC circuit breaker 1 is disposed at a position facing the back surface of the door 64, as shown in FIG. In addition, it is possible to perform the wiring work on the input side with only the door 64 opened with the door 63 closed.

  As shown in FIG. 3, the AC circuit breaker 4 (both the first unit and the second unit) is located on the front side surface of the second member 8 b of the circulation guide member 8 so as to face the back surface of the closed door 62. Has been placed. This makes it easier to connect output-side wiring (such as wiring connected to the power system C) drawn from the output-side wiring port 68 (see FIG. 2A) provided on the bottom surface of the storage board 6. Yes. Moreover, since the width dimension of the door 62 is matched with the width dimension of the output side wiring port 68 and the AC circuit breaker 4 is disposed at a position facing the back surface of the door 62, as shown in FIG. In addition, the wiring work on the output side can be performed with only the door 62 opened with the door 61 closed.

  Further, as shown in FIG. 2A, since the operation panel 69 is attached to the door 63, the operation panel 69 is operated with only the door 62 and the door 64 opened at the time of shipment setting. The work can be performed while looking at the monitor (see FIG. 3B).

  Next, the effect of this embodiment is demonstrated.

  According to the present embodiment, the storage panel 6 is sealed when the doors 61 to 64 are closed, for example, during the operation of the power conditioner B. Therefore, outside air, dust, dust and the like do not enter the storage board 6. Thereby, even when arrange | positioned in a salt damage area, it can prevent that members, such as the reactor 31 arrange | positioned inside the storage panel 6 or inside, by the external air containing salt are corroded. Further, it is possible to prevent dust and dust from being taken into the storage board 6.

  Further, according to the present embodiment, the circulation guide member 8 forms an air flow path that circulates from the internal discharge port 72b of the heat exchanger 7 through the inside of the storage board 6 to the internal suction port 72a. Therefore, it is possible to suppress the cooling function from being lowered due to the cooled air discharged from the internal discharge port 72b being immediately sucked into the internal suction port 72a. Furthermore, between the two frames between the side end of the first member 8a and the inside of the side surface of the storage board 6 (the frame 91 and the vertical frame on the back side inside the side surface of the storage board 6), A gap frame 92 is disposed. Therefore, air can be prevented from passing through the gap between the side end of the first member 8a and the inside of the side surface of the storage board 6, and the deterioration of the cooling function can be further suppressed.

  Moreover, according to this embodiment, the reactor 31 is arrange | positioned in the vicinity of the internal discharge port 72b of the heat exchanger 7, and the heat sink 21 attached to the inverter circuit 2 is arrange | positioned in the vicinity of the internal suction port 72a. The air whose temperature has been increased by removing heat from the reactor 31 is radiated by the storage panel 6 while flowing through the flow path formed inside the storage panel 6, and is moderately heated when reaching the heat sink 21. It is falling. Therefore, the reactor 31 and the inverter circuit 2 that require cooling can be efficiently cooled.

  Further, according to the present embodiment, the circulation guide member 8 divides the interior of the storage board 6 into a front side and a back side to form an air flow path. Therefore, it is not necessary to separately provide a duct for forming the air flow path. Thereby, compared with the case where a duct is provided separately, the magnitude | size of the storage board 6, especially depth (distance of the front and back of a storage board) can be made small.

  Moreover, according to this embodiment, the reactor 31 is arrange | positioned at the lowest part of the storage board 6. FIG. By arranging the reactor 31 having a large weight at the lowermost portion, the center of gravity of the power conditioner B is lowered and can be stabilized. The six reactors 31 are arranged in a row in the horizontal direction when viewed from the front side of the storage panel 6, and the longitudinal direction of each reactor 31 is in the direction in which air is discharged from the internal discharge port 72 b of the heat exchanger 7. It arrange | positions so that it may become substantially parallel. Moreover, each reactor 31 is arrange | positioned at intervals so that the air discharged | emitted from the internal discharge port 72b may pass between each reactor 31 easily. Thereby, it can suppress that the flow path of the air discharged | emitted from the internal discharge port 72b is obstruct | occluded by the reactor 31, and the flow volume of air decreases. Thereby, the reactor 31 can be efficiently cooled without increasing the air volume from the heat exchanger 7. Further, in each reactor 31, the connection terminal 31 a for connecting to the inverter circuit 2 is on the back side of the storage panel 6, and the connection terminal 31 b for connecting to the AC circuit breaker 4 is on the front side of the storage panel 6. Is arranged. Therefore, the wiring for connecting each reactor 31, inverter circuit 2 and AC circuit breaker 4 can be shortened. Moreover, since each reactor 31 is arrange | positioned at intervals at the lowest part and the space is ensured in front of each reactor 31 (front side of the storage board 6), workability | operativity is good.

  Further, according to the present embodiment, the output side wiring port 68 is arranged on the back of the door 62, and the width dimension of the door 62 is matched with the width dimension of the output side wiring port 68. Further, the input side wiring port 67 is disposed on the back of the door 64, and the width dimension of the door 64 matches the width dimension of the input side wiring port 67. Accordingly, by opening only the door 62 or the door 64 while the door 61 and the door 63 are closed, the wiring work can be performed without lowering the work efficiency. The DC breaker 1 is disposed at a position facing the back surface of the door 64, and the AC circuit breaker 4 is disposed at a position facing the back surface of the door 62. Therefore, the DC circuit breaker 1 and the AC circuit breaker 4 can be turned on again by opening only the door 62 or the door 64 while the door 61 and the door 63 are closed. Thereby, since the open part at the time of wiring work or the reopening of each circuit breaker can be made small, even when the power conditioner B is installed in a salt damage area, the inside of the storage panel 6 contains salt. Exposure to outside air can be suppressed. Further, when the door 61 and the door 63 are opened, the door 61 and the door 63 interfere with work. Since the work can be performed while the door 61 and the door 63 are closed, the work efficiency is improved. An operation panel 69 is attached to the door 63 that does not need to be opened. Therefore, the operation can be performed while operating the operation panel 69 (looking at the monitor) with only the door 62 and the door 64 opened at the time of shipment setting or the like.

  Moreover, according to this embodiment, in the manufacturing process of the power conditioner B, the heat exchanger 7 is attached last. Therefore, until the heat exchanger 7 is attached, it is possible to perform attachment work and adjustment work of members arranged on the back side inside the storage board 6 from the four rectangular holes provided in the storage board 6. it can. Thereby, the work efficiency in a manufacturing process improves.

  In the present embodiment, the case where the circulation guiding member 8 has a substantially T-shaped cross section has been described. However, the shape of the circulation guiding member 8 is not limited. The circulation guide member 8 may be any member that forms an air flow path that circulates from the internal discharge port 72b of the heat exchanger 7 through the inside of the storage board 6 to the internal suction port 72a. For example, as shown in FIG. 7 (a), another first member 8a substantially orthogonal to the second member 8b may be added so that the cross section has a substantially F-shape. When there is only one first member 8a, air may stagnate between the first member 8a and the internal suction port 72a and between the first member 8a and the internal discharge port 72b. In the case of the embodiment, each first member 8a is in contact with the heat exchanger 7 near the internal suction port 72a and the internal discharge port 72b, so that air stagnation is suppressed near the internal suction port 72a and the internal discharge port 72b. can do. Further, when the two first members 8a are not substantially orthogonal to the second member 8b but are fixed so as to be inclined as shown in FIG. 7B, the air flow becomes smoother. Further, the circulation guiding member 8 is not limited to the combination of the first member 8a and the second member 8b, and may be a single member as shown in FIGS. 7C and 7D. In FIGS. 7C and 7D, the description of other members disposed inside the storage board 6 is omitted.

  In the present embodiment, the case where the width dimension of the door 62 is matched with the width dimension of the output side wiring port 68 and the width dimension of the door 64 is matched with the width size of the input side wiring port 67 has been described. It is not limited to this. For example, when the width dimension of the output side wiring port 68 is set to be large enough to pass the wiring, if the width dimension of the door 62 is matched with the width dimension of the output side wiring port 68, workability is poor. It may become. In such a case, the width dimension of the door 62 may be made larger than the width dimension of the output side wiring port 68 so that the workability does not deteriorate. Similarly, the width dimension of the door 64 may be larger than the width dimension of the input side wiring port 67. Even in these cases, the wiring work can be performed by opening only the door 62 or the door 64 while the door 61 and the door 63 are closed. In addition, the DC circuit breaker 1 and the AC circuit breaker 4 can be turned on again by opening only the door 62 or the door 64 while the door 61 and the door 63 are closed. Therefore, the open part at the time of wiring work or when each circuit breaker is re-inserted can be reduced, and the inside of the storage board 6 can be prevented from being exposed to the outside air. Further, since the work can be performed with the door 61 and the door 63 closed, the work efficiency is improved.

  In this embodiment, although the arrangement | positioning of each reactor 31 when four heat exchangers 7 with two internal discharge ports 72b were provided was demonstrated, it is not restricted to this. What is necessary is just to arrange | position each reactor 31 suitably according to arrangement | positioning of the heat exchanger 7 and the internal discharge port 72b. Fig.8 (a) has shown about the example of arrangement | positioning of each reactor 31 at the time of providing two heat exchangers 7 with two internal discharge ports 72b. FIG. 8B shows an example of the arrangement of the reactors 31 when two heat exchangers 7 each having three internal discharge ports 72b are provided. Each reactor 31 should just be arrange | positioned so that the flow path of the air discharged | emitted from the internal discharge port 72b may not be blocked | interrupted.

  In this embodiment, although the case where each reactor 31 was arrange | positioned at the lowest part of the storage board 6 was demonstrated, it is not restricted to this. What is necessary is just to arrange | position each reactor 31 according to the position of the internal discharge port 72b of the heat exchanger 7. FIG. However, in order to lower and stabilize the center of gravity of the power conditioner B, it is desirable that each reactor 31 is disposed at the lowermost part of the storage panel 6, so that the internal discharge port 72 b of the heat exchanger 7 is provided in the storage panel 6. It is desirable to design it so that it may be arranged below.

  In the present embodiment, the case where the heat exchanger 7 cools the air inside the storage board 6 has been described, but the present invention is not limited thereto. For example, an air conditioner may be used instead of the heat exchanger 7. However, electric power for operating the air conditioner is required, and power generation efficiency is reduced. Further, when the power conditioner B is not installed in a salt damage area, a blower fan for taking in outside air may be used instead of the heat exchanger 7. However, it is necessary to perform maintenance such as providing a filter for removing dust and dust from the outside air and periodically replacing it. Therefore, it is desirable to use the heat exchanger 7.

  In the present embodiment, the case where the input side wiring port 67 and the output side wiring port 68 are arranged on the bottom surface of the storage board 6 has been described, but they may be arranged on the top surface of the storage board 6. In the present embodiment, the case where the input side wiring port 67 is disposed behind the door 64 and the output side wiring port 68 is disposed behind the door 62 has been described, but the present invention is not limited thereto. For example, the input side wiring port 67 may be disposed behind the door 63. In this case, it is necessary to match the width dimension of the door 63 with the width dimension of the input side wiring port 67. Further, the output-side wiring port 68 may be disposed behind the door 61. In this case, it is necessary to match the width dimension of the door 61 with the width dimension of the output side wiring port 68.

  In the present embodiment, the door 61 and the door 63 can also be opened. However, after the power conditioner B is manufactured, it is hardly necessary to open and close it. Therefore, as shown in FIG. 9A, instead of the door 61 and the door 63, outer walls 61 'and 63' fixed to the housing of the storage board 6 may be provided. Further, as shown in FIG. 9 (b), an outer wall 61 ″ is provided on the front side of the housing of the storage board 6, and the door 62 ′ and the door 64 ′ are reduced in the vertical dimension of the door 62 and the door 64. You may make it provide below the outer wall 61 "(the position of a horizontal direction is the same as that of the case of the door 62 and the door 64). Even in this case, if the door 62 ′ and the door 64 ′ are opened, wiring work and reopening of each circuit breaker can be performed. In the case of the door 62 ′ and the door 64 ′, the open area is smaller than in the case of the door 62 and the door 64. Therefore, it can suppress more that the inside of the storage board 6 is exposed to external air.

  In the said 1st Embodiment, although the case where the power conditioner B was provided with two units (a 1st unit and a 2nd unit) was demonstrated, it is not restricted to this. The power conditioner B may include only one unit, or may include three or more units. Hereinafter, a power conditioner having only one unit will be described as a second embodiment.

  FIG. 10 is a diagram for explaining a power conditioner B ′ according to the second embodiment. FIG. 10A corresponds to FIG. 2A, FIG. 10B corresponds to FIG. 3A, and FIG. 10C corresponds to FIG. FIG. In the same figure, the same code | symbol is attached | subjected to the same or similar element as the power conditioner B which concerns on 1st Embodiment.

  The power conditioner B ′ shown in FIG. 10 is different from the power conditioner B according to the first embodiment in that it includes only one unit.

  As shown in FIG. 10A, only the door 61 and the door 64 are attached to the storage board 6 of the power conditioner B ′. Only one wiring port 67 ′ is provided on the bottom surface of the storage board 6. Both the output side wiring and the input side wiring are drawn from the wiring port 67 '. The width dimension of the door 64 is matched to the width dimension of the wiring port 68 '. As shown in FIG. 10B, the power conditioner B ′ includes three reactors 31, one capacitor 32, one DC breaker 1, one AC breaker 4, and one control device 5. Although not shown, only one inverter circuit 2 is provided. Further, as shown in FIG. 10C, the power conditioner B ′ includes two heat exchangers 7.

  The width of the door 64 is matched to the width of the wiring port 67 '. Further, the DC circuit breaker 1 and the AC circuit breaker 4 are arranged at positions facing the back surface of the door 64. Therefore, the wiring work can be performed with the door 61 closed. Further, the DC circuit breaker 1 and the AC circuit breaker 4 can be turned on again with the door 61 closed. Thereby, since the open part at the time of wiring work or the reopening of each circuit breaker can be made small, even when the power conditioner B is installed in a salt damage area, the inside of the storage panel 6 contains salt. Exposure to outside air can be suppressed.

  Since the other configuration of the power conditioner B ′ is the same as that of the power conditioner B according to the first embodiment, the same effects as those of the first embodiment can be achieved in this embodiment.

  The power conditioner according to the present invention is not limited to the above-described embodiment. The specific configuration of each part of the power conditioner according to the present invention can be varied in design in various ways.

A DC power supply B, B 'Power conditioner 1 DC circuit breaker (breaker)
2 Inverter circuit SW1 to SW6 Switching element (IGBT)
C capacitor C1-C3 snubber circuit 21 heat sink 22 blower fan 3 filter 31 reactor 31a, 31b connection terminal 32 capacitor 4 AC circuit breaker (breaker)
5 Control device 6 Storage board 61, 63 Door (second door)
62, 62 'door (output side door)
64, 64 'door (input side door)
61 ', 63', 61 "outer wall 65 roof 66 stand 67 input side wiring port 67 'wiring port 68 output side wiring port 69 operation panel 7 heat exchanger 71 heat dissipation member 72 heat receiving space 72a internal suction port 72b internal exhaust port 73 heat dissipation Space 73a External suction port 73b External discharge port 8 Circulation guide member 8a First member 8b Second member 91 Frame 92 Frame for gap C Power system

Claims (7)

A storage cabinet to be sealed;
An inverter circuit stored in the storage board;
With
The storage board is
A housing with an opening in the front;
An input-side wiring port for passing the input-side wiring disposed on the top or bottom surface of the housing;
An output side wiring port for passing an output side wiring disposed on the top or bottom surface of the housing;
A first input-side door disposed in the opening, the left-right position when the housing is viewed from the front side overlaps the input-side wiring port;
A second input-side door disposed in the opening, wherein a position in a left-right direction when the housing is viewed from the front side does not overlap the input-side wiring port;
A first output-side door disposed in the opening, wherein a position in a left-right direction when the housing is viewed from the front side overlaps the output-side wiring port;
A second output side door disposed in the opening, wherein a position in a left-right direction when the housing is viewed from the front side does not overlap the output side wiring port;
Comprising
A power conditioner characterized by that. The dimensions in the left-right direction when the housing is viewed from the front side are different between the first input side door and the second input side door, and the first output side door and the second output side door are different. It is different from the output side door.
The power conditioner according to claim 1. A storage cabinet to be sealed;
An inverter circuit stored in the storage board;
With
The storage board is
A housing with an opening in the front;
An input-side wiring port for passing the input-side wiring disposed on the top or bottom surface of the housing;
An output side wiring port for passing an output side wiring disposed on the top or bottom surface of the housing;
A first input-side door disposed in the opening, the left-right position when the housing is viewed from the front side overlaps the input-side wiring port;
An input-side outer wall that is disposed in the opening and does not overlap the input-side wiring port at a position in the left-right direction when the housing is viewed from the front side;
A first output-side door disposed in the opening, wherein a position in a left-right direction when the housing is viewed from the front side overlaps the output-side wiring port;
An output-side outer wall that is disposed in the opening and does not overlap with the output-side wiring port at a position in the left-right direction when the housing is viewed from the front side;
Comprising
A power conditioner characterized by that. The horizontal dimension of the input side wiring port when the housing is viewed from the front side is larger than the horizontal dimension of the output side wiring port.
The power conditioner according to any one of claims 1 to 3. The circuit further comprises a circuit breaker for cutting off the connection between the inverter circuit and the DC power supply or power system,
The circuit breaker is disposed in a position facing the back surface of the door that overlaps each wiring port inside the storage board.
The power conditioner in any one of Claims 1 thru | or 4 . It further comprises an operation panel arranged at a location other than the door that overlaps each wiring port in front of the storage board.
The power conditioner in any one of Claim 1 thru | or 5 . The vertical dimension of the door overlapping the wiring openings is smaller than the vertical dimension of the storage board.
The power conditioner in any one of Claim 1 thru | or 6 .

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