JP2014100050A - Power-feeding system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power-feeding system capable of generating a stable voltage for operating a connection circuit.SOLUTION: A bus voltage setting section 701 superimposes an AC voltage to a DC voltage generated by a solar cell 10 and outputs the superimposed voltage to a voltage bus 81. Connection control circuits 7-1 to 7-4 receive the superimposed voltage through the voltage bus 81, extract an AC voltage from the superimposed voltage, generate a DC voltage from the AC voltage, and connect or disconnect between storage batteries 6-1 to 6-4 and the voltage bus 81 by using the generated DC voltage as an operating voltage.

Description

  The present invention relates to a power feeding system.

  There is known a direct current power feeding system that transmits direct current power generated by a distributed power supply device such as a solar battery to devices and storage batteries through a direct current bus without converting the direct current power into alternating current.

  For example, in a DC power supply system described in Patent Document 1 (Japanese Patent Laid-Open No. 2012-50167), a storage battery is directly connected to a DC power supply unit to which a distributed power supply device, a load, and a system power system are connected. The storage battery includes a storage battery current detection unit that detects the input / output current. The system power system includes a power converter that converts direct current to alternating current and alternating current to direct current between the system power and the direct current power supply unit. A power converter controls the output of a power converter based on the storage battery current information obtained from a storage battery current detection part, and controls a storage battery current or electric power to predetermined value.

JP2012-50167A

  By the way, when connecting or disconnecting a storage battery or device to a DC bus, or when adding a new storage battery or device, connecting a DC power supply line to which a DC bus voltage during system operation is applied directly to the storage battery or device, Since an inrush current to the storage battery or the device may occur and a device damage failure or an electric shock may occur, it is necessary to provide a connection circuit for controlling connection and disconnection with the storage battery or the device. Alternatively, it may be necessary to provide a storage battery and an accompanying circuit for controlling the operation of the device. The power supply voltage for operating this connection circuit or the accompanying circuit is 3.3V to 24V, and a DC voltage lower than the DC voltage of 330V to 400V supplied by the DC bus is required.

  The DC voltage for operating the connection circuit or the accompanying circuit can be generated from, for example, a DC voltage supplied by a DC bus. However, in a power conditioner in which DC power from a distributed power source such as photovoltaic power generation is connected to AC200V system power by a DC / AC inverter, the DC bus voltage that is input to the DC / AC inverter efficiently performs DC / AC conversion. In order to do so, voltage of 330V to 400V is often taken. When a DC voltage for a low-voltage connection circuit power supply is generated from this high-voltage DC bus voltage by a switching power supply circuit, the duty cycle of the pulse width modulation by the switching regulator is shortened and the adjustment region is narrowed, making control difficult. There is a problem that it is easily affected by noise.

  Therefore, an object of the present invention is to provide a power feeding system capable of generating a stable voltage for operating a connection circuit or an accompanying circuit.

  In order to solve the above-described problem, the power supply system of the present invention is based on a voltage bus, a DC voltage generated by a distributed power source, and an AC voltage. The voltage of the voltage bus is superimposed on the DC voltage. A bus voltage setting unit for generating a voltage, a control circuit that extracts an AC voltage from the voltage of the voltage bus and generates a DC voltage from the AC voltage, and the generated DC voltage is supplied as an operating voltage, and a device or a storage battery and a voltage bus A connection circuit for connecting or disconnecting the battery or an associated circuit for controlling the device or the storage battery.

  Preferably, the bus voltage setting unit includes a power conditioner that superimposes an AC voltage on a DC voltage generated by the distributed power supply and outputs the superimposed voltage to the voltage bus.

  Preferably, a plurality of devices or storage batteries are provided. The connection circuit or the accompanying circuit is provided for each device or storage battery. The control circuit is provided for each connection circuit or associated circuit. Each control circuit supplies a DC voltage to a corresponding connection circuit or an associated circuit.

  Preferably, a plurality of devices or storage batteries are provided. The control circuit is provided for each connection circuit or associated circuit, or for each of a plurality of connection circuits or associated circuits. Each control circuit supplies a DC voltage to a corresponding connection circuit or a plurality of connection circuits or associated circuits.

  Preferably, the power conditioner includes an oscillation circuit that generates an AC voltage using the voltage of the voltage bus, an AC voltage that is output from the oscillation circuit, and a superimposing unit that superimposes the DC voltage generated by the distributed power supply. Including.

  Preferably, the power conditioner is connected to the system and uses the voltage from the system to superimpose an oscillation circuit that generates an AC voltage, an AC voltage output from the oscillation circuit, and a DC voltage generated by the distributed power supply. And a superimposing unit.

  Preferably, the power feeding system is connected to the storage battery. The power conditioner includes an oscillation circuit that generates an AC voltage using the voltage of the storage battery, an AC voltage that is output from the oscillation circuit, and a superimposing unit that superimposes the DC voltage generated by the distributed power supply.

  Preferably, the bus voltage setting unit includes a power conditioner that outputs a DC voltage generated by the distributed power supply to the voltage bus, an AC / AC converter that converts an AC voltage from the system into a low AC voltage, and an AC / AC converter. And a superimposing unit that superimposes the AC voltage generated on the voltage of the voltage bus.

  Preferably, the bus voltage setting unit superimposes an AC voltage on the DC voltage generated by the distributed power supply and outputs the power conditioner to the voltage bus, and an AC / AC that converts the AC voltage from the system into a low AC voltage. The converter includes a superimposing unit that superimposes the AC voltage generated by the AC / AC converter on the voltage of the voltage bus.

  Preferably, the bus voltage setting unit includes a switch, a power conditioner that superimposes an AC voltage on a DC voltage generated by the distributed power supply, and outputs the voltage to the voltage bus through the switch, and a low AC voltage from the system. An AC / AC converter that converts the voltage into a voltage and a superimposing unit that superimposes an AC voltage generated by the AC / AC converter on the voltage of the voltage bus.

  Preferably, the AC / AC converter performs the conversion when the switch is off. The superimposing unit performs superimposing of the AC voltage when the switch is off.

Preferably, the power feeding system includes a device or a storage battery.
Preferably, a storage battery is provided, and the bus voltage setting unit includes a power conditioner that outputs a DC voltage generated by the distributed power source to the voltage bus, a DC / AC converter that converts the DC voltage from the storage battery into an AC voltage, and DC A superimposing unit that superimposes the AC voltage generated by the AC converter on the voltage of the voltage bus.

  Preferably, a storage battery is provided, and the bus voltage setting unit superimposes an AC voltage on a DC voltage generated by the distributed power source, and converts the DC voltage from the storage battery into an AC voltage. A DC / AC converter, and a superimposing unit that superimposes an AC voltage generated by the DC / AC converter on a voltage of the voltage bus.

  Preferably, a storage battery is provided, and the bus voltage setting unit includes a switch, a power conditioner that superimposes an AC voltage on a DC voltage generated by the distributed power supply, and outputs the voltage to the voltage bus through the switch, and a DC from the storage battery. A DC / AC converter that converts the voltage into an AC voltage and a superimposing unit that superimposes the AC voltage generated by the DC / AC converter on the voltage of the voltage bus are included.

  Preferably, the DC / AC converter performs the conversion when the switch is off. The superimposing unit performs superimposing of the AC voltage when the switch is off.

  Preferably, the bus voltage setting unit generates AC voltages having frequencies different from each other, and superimposes at least one AC voltage of the plurality and the DC voltage generated by the distributed power source, and the device or the storage battery is A plurality of connection circuits or associated circuits are provided for each device or storage battery, and a control circuit is provided for each connection circuit or associated circuit, or for each of a plurality of connection circuits or associated circuits, and generated alternating current. Provided for each voltage, each control circuit supplies a DC voltage to one or more corresponding connection circuits or associated circuits, and each control circuit outputs a corresponding oscillation circuit included in the superimposed voltage. The control circuit includes a band-pass filter that passes a frequency component of the AC voltage to be supplied, and each control circuit supplies a DC voltage to a corresponding connection circuit or an associated circuit.

  Preferably, each oscillation circuit outputs an AC voltage having an amplitude corresponding to a DC voltage for driving the corresponding connection circuit or associated circuit.

  Preferably, the connection circuit or the accompanying circuit includes a switch that is provided between the voltage bus and the device or the storage battery and whose opening and closing is controlled by a DC voltage sent from the control circuit.

  Preferably, the power conditioner controls the amplitude of the alternating voltage to be superimposed so that no inrush current flows when the device or the storage battery is connected to the voltage bus.

  Preferably, the power conditioner includes a first oscillation circuit and a second oscillation circuit as the oscillation circuit. Each oscillation circuit generates an alternating voltage having a different frequency. The superimposing unit superimposes the AC voltage output from at least one of the two oscillation circuits and the DC voltage generated by the distributed power supply. The connection circuit or the accompanying circuit is provided for each device or storage battery. The control circuit is provided for each connection circuit or associated circuit, or for each of a plurality of connection circuits or associated circuits. Each control circuit supplies a DC voltage to a corresponding one or connection circuit or associated circuit. Each control circuit passes a frequency component of the AC voltage output from the first oscillation circuit included in the superimposed voltage, rectifies and smoothes, and outputs a first DC voltage; A second rectifier circuit that passes the frequency component of the AC voltage output from the second oscillation circuit included in the superimposed voltage, rectifies and smoothes, and outputs the second DC voltage. The connection circuit or the accompanying circuit is provided between the voltage bus and the corresponding device or storage battery, and the first switch whose switching is controlled by the first DC voltage sent from the corresponding control circuit, and the voltage bus And a second switch provided between the corresponding device or the storage battery and controlled to be opened and closed by a second DC voltage sent from the corresponding control circuit. A current from the device or the storage battery to the voltage bus flows through the first switch, and a current from the voltage bus to the device or the storage battery flows through the second switch.

  According to the present invention, a stable voltage for operating the connection circuit can be generated.

It is a figure showing the structure of the electric power feeding system of 1st Embodiment. It is a figure showing the structure of the power conditioner contained in FIG. FIG. 2 is a diagram illustrating a configuration of a connection control circuit included in FIG. 1. (A) is a figure showing the voltage waveform in the node A of FIG. (B) is a diagram showing a voltage waveform at node B in FIG. 2. (C) is a figure showing the voltage waveform in the node C of FIG. (D) is a figure showing the voltage waveform in the node D of FIG. It is a figure showing the structure of the power conditioner of the modification 1 of 1st Embodiment. It is a figure showing the structure of the power conditioner of the modification 2 of 1st Embodiment. It is a figure showing the structure of the power conditioner of the modification 3 of 1st Embodiment. It is a figure showing the structure of the electric power feeding system of 2nd Embodiment. It is a figure showing the structure of the electric power feeding system of 3rd Embodiment. It is a figure showing the structure of the electric power feeding system of 4th Embodiment. It is a figure showing the structure of the power conditioner of 4th Embodiment. It is a figure showing the structure of the electric power feeding system of the modification 1 of 4th Embodiment. It is a figure showing the structure of the electric power feeding system of the modification 3 of 4th Embodiment. It is a figure showing the structure of the electric power feeding system of 5th Embodiment. It is a figure showing the structure of the electric power feeding system of the modification 1 of 5th Embodiment. It is a figure showing the structure of the electric power feeding system of the modification 3 of 5th Embodiment. It is a figure showing the structure of the electric power feeding system of the other modification of 1st-5th embodiment. It is a figure showing the structure of the electric power feeding system of 6th Embodiment. It is a figure showing the structure of the power conditioner of FIG. It is a figure showing the structure of the connection control circuit or the accompanying control circuit 63-1 contained in FIG. It is a figure showing the structure of the connection control circuit or the accompanying control circuit 63-2 contained in FIG. It is a figure showing the structure of the connection control circuit or the accompanying control circuit 63-3 contained in FIG. It is a figure showing the structure of the 1st band pass filter of 6th Embodiment. It is a figure showing a voltage waveform in a plurality of places when a power conditioner superimposes an alternating voltage of frequency f1, f2, and f3 on a direct current voltage. (A) is a figure showing the alternating voltage whose frequency is f1 and whose amplitude is 30V. (B) is a figure showing the alternating voltage whose frequency is f2 and whose amplitude is 48V. (C) is a figure showing the alternating voltage whose frequency is f3 and whose amplitude is 10V. It is a figure showing the structure of the electric power feeding system of 7th Embodiment. FIG. 27 is a diagram illustrating a configuration of a connection control circuit or an accompanying control circuit included in FIG. 26. FIG. 28 is a diagram illustrating a configuration of a connection circuit or an accompanying circuit included in FIG. 27. It is a figure showing the gate-collector current characteristic of the switch for charge control, and the switch for discharge control. It is a figure showing the structure of the electric power feeding system of 8th Embodiment. It is a figure showing the structure of the power conditioner contained in FIG. FIG. 31 is a diagram illustrating a configuration of a connection control circuit or an accompanying control circuit included in FIG. 30. It is a figure showing the structure of the connection circuit contained in FIG. 32, or an accompanying circuit. It is a figure showing the voltage waveform in a several location in case a power conditioner has superimposed the alternating voltage of frequency f1, f2 on direct current voltage.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a diagram illustrating a configuration of a power feeding system according to the first embodiment.

  Referring to FIG. 1, this power supply system 1 includes a voltage bus 81, a control line 82, a solar cell 10, a system power 12, a bus voltage setting unit 701 including a power conditioner 11, a connection control circuit or Attached control circuits 7-1 to 7-4, storage batteries 6-1 to 6-4, and a DC load 99 are provided.

  The power conditioner 11 buys system power from an electric power company or the like (power purchase), supplies power to the DC load 99 through the voltage bus 81, and charges the storage batteries 6-1 to 6-4 as necessary. Alternatively, discharge is performed to accommodate power. Moreover, the power conditioner 11 performs control for selling surplus power to an electric power company or the like (power sale). The main function of the power conditioner 11 is to superimpose an AC voltage on the DC voltage generated by the solar cell 10 and output it to the voltage bus 81.

  The connection control circuit or the accompanying control circuits 7-1 to 7-4 controls connection / disconnection between the storage batteries 6-1 to 6-4 and the voltage bus 81. It also controls operations such as operation / stop of the storage battery.

  The storage batteries 6-1 to 6-4 store the surplus power output from the power conditioner 11, and discharge and store the stored power when power is insufficient.

  The voltage bus 81 supplies DC power to the storage battery. Voltage bus 81 includes a positive bus and a negative bus that are a pair of power lines.

The solar cell 10 is a distributed power source and supplies a direct-current voltage (for example, DC 200V).
The grid power 12 supplies an AC voltage (for example, AC 200V) received from an electric power company or the like. The system power 12 is supplied from a single-phase three-wire commercial AC power system. In the single-phase three-wire commercial AC power system, the neutral wire is grounded via a resistor, and AC 200 V is supplied using two wires (R-phase wire and T-phase wire) other than the neutral wire.

FIG. 2 is a diagram illustrating the configuration of the power conditioner of FIG.
Referring to FIG. 2, power conditioner 11 includes a DC / DC converter 41, an oscillation circuit 43, a superimposing unit 44, a bidirectional AC / DC converter 42, and a command unit 151.

  The DC / DC converter 41 converts a direct voltage (for example, DC 200V) output from the solar cell 10 into a direct voltage (DC 400V).

  The oscillation circuit 43 is supplied with the voltage at the node B of the voltage bus 81 and generates an AC voltage (AC 20 V).

  The superimposing unit 44 superimposes the AC voltage (AC 20 V) output from the oscillation circuit 43 and the DC voltage (DC 400 V) output from the DC / DC converter 41. The superimposing unit 44 is constituted by a transformer, for example.

  Bidirectional AC / DC converter 42 converts the DC voltage received from voltage bus 81 into an AC voltage and supplies it to system power 12. Bidirectional AC / DC converter 42 converts the AC voltage received from system power 12 into a DC voltage and supplies it to voltage bus 81.

  The instruction unit 151 controls connection of control signals for controlling connection / disconnection between the storage batteries 6-1 to 6-4 and the voltage bus 81 according to a predetermined schedule or an instruction from the user through the control line 82. This is supplied to the circuit or the accompanying control circuits 7-1 to 7-4.

  FIG. 3 is a diagram illustrating the configuration of the connection control circuit or the accompanying control circuit 7-1 in FIG. The connection control circuit or the accompanying control circuits 7-2 to 7-4 are the same as this.

  The connection control circuit or associated control circuit 7-1 includes a connection circuit or associated circuit 13-1 and a control circuit 14-1.

  The control circuit 14-1 receives the superimposed voltage through the voltage bus 81, extracts an alternating voltage from the superimposed voltage, and generates a direct voltage from the alternating voltage.

  Control circuit 14-1 includes a transformer 59, a resistor R <b> 1, and a rectifier circuit 53. Rectifier circuit 53-1 includes capacitors C1 to C4 and a diode bridge 52.

  One of the primary sides of the transformer 59 is connected to the voltage bus 81, and the other is connected to the ground via a resistor R1 (DC load such as a DC device).

  On the secondary side of the transformer 59, only an alternating voltage (AC 20V) is generated. The secondary side of the transformer 59 is connected to capacitors C2, C3, and C4. A voltage C is generated between one end of the capacitor C3 and one end of the capacitor C4.

  The diode bridge 52 includes diodes D1 to D4, and rectifies the voltage C in full wave.

  The smoothing capacitor C1 is connected to the node N1 and the node N2 of the diode bridge 52, and smoothes the voltage between the node N1 and the node N2 to generate a DC voltage (DC12V).

  The connection circuit or the accompanying circuit 13-1 is supplied with a DC voltage (DC 12 V) as an operating voltage, and connects or disconnects the storage battery 6-1 and the voltage bus 81 or controls the storage battery, equipment, and the like.

  The connection circuit or the accompanying circuit 13-1 is connected to the power conditioner 11 through the control line 82, and connects between the storage battery 6-1 and the voltage bus 81 based on a control signal transmitted through the control line 82. Or it controls cutting or a storage battery, equipment, etc.

Next, voltages at a plurality of nodes in the above power supply system will be described.
FIG. 4A shows a voltage waveform at node A in FIG. The voltage at the node A is a direct current voltage (DC 400 V) output from the DC / DC converter 41.

  FIG. 4B shows a voltage waveform at node B in FIG. The voltage at the node B is a voltage obtained by superimposing the AC voltage (AC 20 V) output from the oscillation circuit 43 and the DC voltage (DC 400 V) output from the DC / DC converter 41.

  FIG. 4C shows a voltage waveform at node C in FIG. The voltage at node C is an AC voltage (AC 20 V) extracted from the superimposed voltage at node B.

  FIG. 4D shows a voltage waveform at node D in FIG. The voltage at the node D is a DC voltage (DC12V) obtained by smoothing the voltage at the node C.

  As described above, according to this embodiment, it is possible to generate a stable voltage for operating a connection circuit or an accompanying circuit. Since this voltage is transmitted using a voltage bus sent to the storage battery, it is not necessary to separately provide wiring for transmitting this voltage, so that the cost can be reduced.

[Modification 1 of the first embodiment]
FIG. 5 is a diagram illustrating a configuration of a power conditioner according to the first modification of the first embodiment.

  The power conditioner 101 is different from the power conditioner 11 shown in FIG. 2 in the voltage for operating the oscillation circuit 43. That is, the oscillating circuit 43 is supplied with the DC voltage (DC 400 V) output from the DC / DC converter 41 and generates an AC voltage (AC 20 V).

[Modification 2 of the first embodiment]
FIG. 6 is a diagram illustrating a configuration of a power conditioner according to a second modification of the first embodiment.

  The difference between the power conditioner 102 and the power conditioner 11 shown in FIG. 2 is a voltage for operating the oscillation circuit 43. That is, the oscillation circuit 43 is supplied with the AC voltage (AC200V) output from the system power 12, and generates the AC voltage (AC20V).

[Modification 3 of the first embodiment]
FIG. 7 is a diagram illustrating a configuration of a power conditioner according to Modification 3 of the first embodiment.

  The difference between the power conditioner 103 and the power conditioner 11 shown in FIG. 2 is the voltage for operating the oscillation circuit 43. That is, the oscillating circuit 43 is supplied with the DC voltage (DC384V) output from the storage battery 6-1, and generates an AC voltage (AC20V).

[Second Embodiment]
FIG. 8 is a diagram illustrating a configuration of a power feeding system according to the second embodiment.

  The power supply system 2 is different from the power supply system 1 of the first embodiment in FIG. 1 in that devices 8-1 to 8-4 are connected instead of the storage batteries 6-1 to 6-4. It is.

  Here, the devices 8-1 to 8-4 are an air conditioner used at home, a refrigerator, a washing machine, a television, a lighting device, an electric device such as a personal computer, a computer used in an office, a copying machine, It is an electric device such as a facsimile, a showcase used in a store, or an illumination device. The electric device includes a device having a function of controlling operation / stop or the like by a control signal from an associated control circuit, and is activated or stopped by a control signal from the associated control circuit.

  Even when the devices 8-1 to 8-4 are connected instead of the storage batteries 6-1 to 6-4, the DC voltage for operating the connection circuit or the accompanying circuit is connected as in the first embodiment. Supplied to a circuit or an accompanying circuit. The connection control circuit or the accompanying control circuits 7-1 to 7-4 controls connection / disconnection between the devices 8-1 to 8-4 and the voltage bus 81. It also controls operations such as device activation / deactivation.

[Third Embodiment]
FIG. 9 is a diagram illustrating a configuration of a power feeding system according to the third embodiment.

  The power feeding system 3 is different from the power feeding system 1 of the first embodiment in FIG. 1 in that four connection control circuits or associated control circuits 7-1 to 7-4 each composed of a connection circuit or an associated circuit and a control circuit. Instead, one control circuit 14 and four connection circuits or associated circuits 13-1 to 13-4 are provided.

The control circuit 14 in FIG. 9 is the same as the control circuit 14-1 in FIG.
The connection circuit or associated circuit 13-1 to 13-4 in FIG. 9 is the same as the connection circuit or associated circuit 13-1 in FIG.

  In the first embodiment, the voltage bus 81 is connected to the four control circuits 14-1 to 14-4, and the DC voltage (DC12V) generated by each control circuit 14-1 to 14-4 is a corresponding connection. It was supplied to the circuit or the accompanying circuits 13-1 to 13-4.

  On the other hand, in the present embodiment, the voltage bus 81 is connected to one control circuit 14, and the DC voltage (DC 12V) generated by one control circuit 14 is four connection circuits or associated circuits 13-1. To 13-4.

  As described above, according to the present embodiment, a single control circuit generates a DC voltage and supplies it to a plurality of connection circuits or associated circuits, so that the number of components constituting the power feeding system can be reduced. . In particular, it is effective when a plurality of connection circuits or associated circuits and storage batteries are provided at close positions.

[Fourth Embodiment]
FIG. 10 is a diagram illustrating a configuration of a power feeding system according to the fourth embodiment.

  The power supply system 4 is different from the power supply system 1 of the first embodiment in FIG. 1 in a bus voltage setting unit 702. The bus voltage setting unit 702 includes a power conditioner 31, an AC / AC converter 32, and a superposition unit 34.

FIG. 11 is a diagram illustrating a configuration of a power conditioner according to the fourth embodiment.
The power conditioner 31 does not include the oscillation circuit 43 and the superimposing unit 44 included in the power conditioner 11 of FIG. The DC / DC converter 41 of the power conditioner 31 converts a DC voltage (for example, DC 200 V) output from the solar cell 10 into a DC voltage (DC 400 V) and outputs the DC voltage to the voltage bus 81.

  The AC / AC converter 32 converts the AC voltage (AC 200 V) received from the system power 12 into an AC voltage (AC 20 V) and supplies the AC voltage to the voltage bus 81.

  The superimposing unit 34 superimposes the AC voltage (AC 20 V) output from the AC / AC converter 32 on the voltage of the voltage bus 81. In other words, in the normal state, the superimposing unit 34 receives the DC voltage (DC 400 V) output from the DC / DC converter 41 of the power conditioner 31 to the voltage bus 81 and the AC voltage (AC 20 V) output from the AC / AC converter 32. Is superimposed. When an abnormality occurs in the power conditioner 31 or the bus between the power conditioner 31 and the superimposing unit 34 is disconnected, the DC voltage (DC 400 V) is not supplied from the power conditioner 31 to the superimposing unit 34. In this case, the superimposing unit 34 supplies the AC voltage (AC 20 V) output from the AC / AC converter 32 to the voltage bus 81.

  As described above, according to the present embodiment, even when no voltage is supplied from the power conditioner to the voltage bus, the connection or disconnection of the connection circuit can be controlled using the voltage of the system power. it can.

[Modification 1 of Fourth Embodiment]
FIG. 12 is a diagram illustrating a configuration of a power feeding system according to Modification 1 of the fourth embodiment.

  The power supply system 404 is different from the power supply system 4 in FIG. 10 in a bus voltage setting unit 703. The bus voltage setting unit 703 includes the power conditioner 11, the AC / AC converter 32, and the superimposing unit 34.

  In this modification, the power conditioner 11 is the same as the power conditioner 11 of the first embodiment.

  That is, the power conditioner 11 according to this modification outputs a voltage obtained by superimposing the DC voltage (DC 400 V) and the AC voltage (AC 20 V) to the voltage bus 81.

  The superimposing unit 34 superimposes the AC voltage (AC 20 V) output from the AC / AC converter 32 on the voltage of the voltage bus 81. That is, at the normal time, the superimposing unit 34 is configured to superimpose a DC voltage (DC 400 V) output from the power conditioner 11 to the voltage bus 81 and an AC voltage (AC 20 V), and an AC output from the AC / AC converter 32. The voltage (AC20V) is superimposed. When an abnormality occurs in the power conditioner 11 or the bus between the power conditioner 11 and the superimposing unit 34 is disconnected, no voltage is supplied from the power conditioner 11 to the superimposing unit 34. In this case, the superimposing unit 34 supplies the AC voltage (AC 20 V) output from the AC / AC converter 32 to the voltage bus 81.

[Modification 2 of the fourth embodiment]
The AC / AC converter 32 and the superimposing unit 34 included in the power supply system 4 of the fourth embodiment may operate only when no voltage is supplied from the power conditioner 31 to the voltage bus 81.

  Similarly, the AC / AC converter 32 and the superimposing unit 34 included in the power supply system 404 according to the first modification of the fourth embodiment are only when no voltage is supplied from the power conditioner 11 to the voltage bus 81. It may be operated.

[Modification 3 of the fourth embodiment]
FIG. 13 is a diagram illustrating a configuration of a power feeding system according to Modification 3 of the fourth embodiment.

  In the bus voltage setting unit 704 of the power supply system 405 of this modification, a switch SWA is provided between the power conditioner 11 and the voltage bus 81.

  When it is not appropriate to supply the voltage from the power conditioner 11 to the voltage bus (for example, when it is desired to operate the DC load 99 with the power from the storage batteries 6-1 to 6-4), or the storage battery 6-1. When the power from ˜6-4 is not desired to flow to the grid power 12, the switch SWA is turned off by the control by the command unit 151 in the power conditioner 11. Further, the command unit 151 controls the AC / AC converter 32 to perform conversion and the superimposing unit 34 to superimpose AC voltage when the switch SWA is OFF.

[Fifth Embodiment]
FIG. 14 is a diagram illustrating a configuration of a power supply system according to the fifth embodiment.

  The power supply system 5 is different from the power supply system 1 of the first embodiment in FIG. 1 in a bus voltage setting unit 705. The bus voltage setting unit 705 includes a power conditioner 31, a DC / AC converter 33, and a superposition unit 34.

  The power conditioner 31 is the same as the power conditioner 31 of the fourth embodiment shown in FIG.

  The power conditioner 31 does not include the oscillation circuit 43 and the superimposing unit 44 included in the power conditioner 11 of FIG. The DC / DC converter 41 of the power conditioner 31 converts a DC voltage (for example, DC 200 V) output from the solar cell 10 into a DC voltage (DC 400 V) and outputs the DC voltage to the voltage bus 81.

  The DC / AC converter 33 converts the DC voltage (DC384V) output from the storage battery 6-4 into an AC voltage (AC20V).

  The superimposing unit 34 superimposes the AC voltage (AC 20 V) output from the DC / AC converter 33 on the voltage of the voltage bus 81. That is, at the normal time, the superimposing unit 34 receives the DC voltage (DC 400V) output from the DC / DC converter 41 of the power conditioner 31 to the voltage bus 81 and the AC voltage (AC 20V) output from the DC / AC converter 33. Is superimposed. When an abnormality occurs in the power conditioner 31 or the bus between the power conditioner 31 and the superimposing unit 34 is disconnected, the DC voltage (DC 400 V) is not supplied from the power conditioner 31 to the superimposing unit 34. In this case, the superimposing unit 34 supplies the AC voltage (AC 20 V) output from the DC / AC converter 33 to the voltage bus 81.

  As described above, according to the present embodiment, even when there is no voltage supply from the power conditioner to the voltage bus, the connection circuit connection or disconnection control or the storage battery operation is performed using the storage battery voltage. Can be controlled.

[First Modification of Fifth Embodiment]
FIG. 15 is a diagram illustrating a configuration of a power feeding system according to Modification 1 of the fifth embodiment.

  The power supply system 504 is different from the power supply system 5 in FIG. 14 in a bus voltage setting unit 706. The bus voltage setting unit 706 includes the power conditioner 11, the DC / AC converter 33, and the superimposing unit 34.

  In this modification, the power conditioner 11 is the same as the power conditioner 11 of the first embodiment.

  That is, the power conditioner 11 according to this modification outputs a voltage obtained by superimposing the DC voltage (DC 400 V) and the AC voltage (AC 20 V) to the voltage bus 81.

  The superimposing unit 34 superimposes the AC voltage (AC 20 V) output from the DC / AC converter 33 on the voltage of the voltage bus 81. That is, at the normal time, the superimposing unit 34 is configured to superimpose a DC voltage (DC 400 V) output from the power conditioner 11 to the voltage bus 81 and an AC voltage (AC 20 V), and an AC output from the DC / AC converter 33. The voltage (AC20V) is superimposed. When an abnormality occurs in the power conditioner 11 or the bus between the power conditioner 11 and the superimposing unit 34 is disconnected, no voltage is supplied from the power conditioner 11 to the superimposing unit 34. In this case, the superimposing unit 34 supplies the AC voltage (AC 20 V) output from the DC / AC converter 33 to the voltage bus 81.

[Modification 2 of Fifth Embodiment]
The DC / AC converter 33 and the superimposing unit 34 included in the power supply system 5 of the fifth embodiment may operate only when no voltage is supplied from the power conditioner 31 to the voltage bus 81.

  Similarly, the DC / AC converter 33 and the superimposing unit 34 included in the power supply system 504 according to the first modification of the fifth embodiment are only provided when no voltage is supplied from the power conditioner 11 to the voltage bus 81. It may be operated.

[Modification 3 of Fifth Embodiment]
FIG. 16 is a diagram illustrating a configuration of a power feeding system according to Modification 3 of the fifth embodiment.

  In the bus voltage setting unit 707 of the power supply system 505 according to this modification, a switch SW <b> 1 is provided between the power conditioner 11 and the voltage bus 81.

  When it is not appropriate to supply the voltage from the power conditioner 11 to the voltage bus (for example, when it is desired to operate the DC load 99 with the power from the storage batteries 6-1 to 6-4), or the storage battery 6-1. When the power from ˜6-4 is not desired to flow to the grid power 12, the switch SW <b> 1 is turned off under the control of the command unit 151 in the power conditioner 11. The command unit 151 controls the DC / AC converter 33 to perform conversion and the superimposing unit 34 to superimpose an AC voltage when the switch SWA is off.

[Other Modifications of First to Fifth Embodiments]
FIG. 17 is a diagram illustrating a configuration of a power feeding system according to another modification.

  The AC / AC converter that generates the AC voltage (AC 20 V) superimposed on the voltage bus exemplified in the above-described embodiment of the present invention is configured by a voltage conversion circuit.

  However, as shown in FIG. 17, the coupling transformer of the superimposing unit 340 included in the bus voltage setting unit 708 is configured by an insulating transformer having an output voltage ratio of 10: 1 in order to realize a function with a lower cost and easier configuration. It is good as well. That is, the superimposing unit 340 also has the function of an AC / AC converter. Thereby, AC200V can be converted into AC20V and directly superimposed on the voltage bus.

[Sixth Embodiment]
FIG. 18 is a diagram illustrating a configuration of a power feeding system according to the sixth embodiment.

  The power supply system 61 is different from the power supply system 2 of the second embodiment in FIG. 8 in that the power conditioner 11, the devices 8-1 to 8-4, and the connection control circuit that constitute the bus voltage setting unit 701 are different. Alternatively, instead of the associated control circuits 7-1 to 7-4, the power conditioner 62, the devices 8-1 to 8-3, and the connection control circuit or the associated control circuits 63-1 to 63 that constitute the bus voltage setting unit 709. -3.

  The power conditioner 62 superimposes AC voltages having a plurality of frequencies and outputs the superimposed voltage to the voltage bus 81.

  The connection control circuit or the accompanying control circuits 63-1 to 63-3 has a band-pass filter that passes AC power of a specific frequency. As a result, it is possible to supply power suitable for the power source that individually operates the connection circuit for each device or the associated circuits 13-1 to 13-3.

FIG. 19 is a diagram illustrating the configuration of the power conditioner 62.
The power conditioner 62 of FIG. 19 differs from the power conditioner 11 of the first embodiment of FIG. 2 in that instead of the oscillation circuit 43 and the superimposing unit 44, the first oscillation circuit 43-1 and the second oscillation circuit are provided. The circuit 43-2, the third oscillation circuit 43-3, and the superimposing unit 94 are provided.

  The first oscillation circuit 43-1 is supplied with the voltage at the node B of the voltage bus 81, and generates an AC voltage (for example, AC 20V) having the frequency f1. The second oscillation circuit 43-2 is supplied with the voltage at the node B of the voltage bus 81, and generates an AC voltage (for example, AC 20V) having a frequency f2. The third oscillation circuit 43-3 is supplied with the voltage at the node B of the voltage bus 81, and generates an AC voltage (for example, AC 20V) having the frequency f3. The frequencies f1, f2, and f3 of these oscillation circuits 43-1 to 43-3 can be set to arbitrary values by adjusting parameters in the oscillation circuits 43-1 to 43-3. f1, f2, and f3 are different from each other.

  The superimposing unit 94 outputs the AC voltage having the frequency f1 output from the first oscillation circuit 43-1, the AC voltage having the frequency f2 output from the second oscillation circuit 43-2, and the output from the third oscillation circuit 43-3. The AC voltage having the frequency f3 and the DC voltage (DC 400V) output from the DC / DC converter 41 are superimposed.

FIG. 20 is a diagram illustrating the configuration of the connection control circuit or the accompanying control circuit 63-1.
A control circuit 64-1 in the connection control circuit or the accompanying control circuit 63-1 corresponds to the first oscillation circuit 43-1.

  The connection control circuit or associated control circuit 63-1 is different from the connection control circuit or associated control circuit 7-1 in FIG. 3 in that the rectifier circuit 68-1 includes a first bandpass filter 65-1. is there.

  The first band pass filter 65-1 is provided between one end of the capacitor C2 and one end of the capacitor C3, and between the other end of the capacitor C2 and one end of the capacitor C4. The first bandpass filter 65-1 passes an AC voltage having a frequency f1.

FIG. 21 is a diagram illustrating the configuration of the connection control circuit or the accompanying control circuit 63-2.
A control circuit 64-2 in the connection control circuit or the accompanying control circuit 63-2 corresponds to the second oscillation circuit 43-2.

  The connection control circuit or associated control circuit 63-2 is different from the connection control circuit or associated control circuit 7-1 in FIG. 3 in that the rectifier circuit 68-2 includes a second bandpass filter 65-2. is there.

  The second band pass filter 65-2 is provided between one end of the capacitor C2 and one end of the capacitor C3, and between the other end of the capacitor C2 and one end of the capacitor C4. The second band pass filter 65-2 passes an AC voltage having a frequency f2.

FIG. 22 is a diagram illustrating the configuration of the connection control circuit or the accompanying control circuit 63-3.
The control circuit 64-3 in the connection control circuit or the accompanying control circuit 63-3 corresponds to the third oscillation circuit 43-3.

  The connection control circuit or associated control circuit 63-3 is different from the connection control circuit or associated control circuit 7-1 of FIG. 3 in that the rectifier circuit 68-3 includes a third bandpass filter 65-3. is there.

  The third band pass filter 65-3 is provided between one end of the capacitor C2 and one end of the capacitor C3, and between the other end of the capacitor C2 and one end of the capacitor C4. The third band pass filter 65-3 passes an AC voltage having a frequency f3.

  FIG. 23 is a diagram illustrating the configuration of the first bandpass filter 65-1. The configurations of the second bandpass filter 65-2 and the third bandpass filter 65-3 are the same as this.

  The first band pass filter 65-1 includes an operational amplifier OP, resistance elements R2 to R4, and capacitors C5 and C6. The pass frequency of the first band-pass filter 65-1 is matched with the oscillation frequency f1 of the first oscillation circuit 43-1 by adjusting the resistance values of the resistance elements R2 to R4 and the capacitance values of the capacitors C5 and C6. be able to.

  Similarly, the pass frequency of the second band-pass filter 65-2 is adjusted by adjusting the resistance values of the resistance elements R2 to R4 and the capacitance values of the capacitors C5 and C6, thereby causing the oscillation frequency f2 of the second oscillation circuit 43-2. Can be matched. The pass frequency of the third band pass filter 65-3 is matched with the oscillation frequency f3 of the third oscillation circuit 43-3 by adjusting the resistance values of the resistance elements R2 to R4 and the capacitance values of the capacitors C5 and C6. be able to.

  For example, when driving the connection circuit connected to the device 8-1 or the accompanying circuit 13-1, the power conditioner 62 superimposes the AC voltage having the frequency f <b> 1 on the DC voltage. The control circuit 64-1 that controls the connection circuit or the associated circuit 13-1 extracts the alternating voltage of the frequency f1 superimposed on the direct current voltage, and the connection circuit or the associated circuit 13-1 with the rectified and smoothed direct current voltage. Drive.

  Further, when driving the connection circuit connected to the device 8-2 or the accompanying circuit 13-2, the power conditioner 62 superimposes the AC voltage having the frequency f2 on the DC voltage. The control circuit 64-2 that controls the connection circuit or the accompanying circuit 13-2 extracts the alternating voltage of the frequency f2 superimposed on the direct current voltage, and the connection circuit or the accompanying circuit 13-2 with the rectified and smoothed direct current voltage. Drive.

  Further, when driving the connection circuit connected to the device 8-3 or the accompanying circuit 13-3, the power conditioner 62 superimposes the AC voltage having the frequency f3 on the DC voltage. The control circuit 64-3 that controls the connection circuit or the associated circuit 13-3 extracts the alternating voltage of the frequency f3 superimposed on the direct current voltage, and the connection circuit or the associated circuit 13-3 with the rectified and smoothed direct current voltage. Drive.

  FIG. 24 is a diagram illustrating voltage waveforms at a plurality of locations when the power conditioner 62 superimposes AC voltages having frequencies f1, f2, and f3 on a DC voltage.

FIG. 24A shows a voltage waveform at node B. FIG.
The voltage of the node B includes the AC voltage having the frequency f1 output from the first oscillation circuit 43-1, the AC voltage having the frequency f2 output from the second oscillation circuit 43-2, and the third oscillation circuit 43-3. This is a voltage obtained by superimposing the output AC voltage of frequency f3 and the DC voltage output from the bidirectional AC / DC converter 42.

  FIG. 24B shows a voltage waveform at node C of the connection control circuit or the accompanying control circuit 63-1.

  The voltage at the node C of the connection control circuit or the accompanying control circuit 63-1 is an AC voltage having the frequency f1 extracted by the first band pass filter 65-1.

  FIG. 24C shows a voltage waveform at the node D of the connection control circuit or the accompanying control circuit 63-1.

  The voltage at the node D of the connection control circuit or the accompanying control circuit 63-1 is a voltage obtained by rectifying and smoothing the voltage at the node C. The voltage at the node D is a voltage for driving the connection circuit or the accompanying circuit 13-1.

  FIG. 24D shows a voltage waveform at the node C of the connection control circuit or the accompanying control circuit 63-2.

  The voltage at the node C of the connection control circuit or the accompanying control circuit 63-2 is an AC voltage having the frequency f2 extracted by the second band pass filter 65-2.

  FIG. 24E shows a voltage waveform at the node D of the connection control circuit or the accompanying control circuit 63-2.

  The voltage at the node D of the connection control circuit or the accompanying control circuit 63-2 is a voltage obtained by rectifying and smoothing the voltage at the node C. The voltage at the node D is a voltage for driving the connection circuit or the accompanying circuit 13-2.

  FIG. 24F shows a voltage waveform at node C of the connection control circuit or the accompanying control circuit 63-3.

  The voltage at the node C of the connection control circuit or the accompanying control circuit 63-3 is an AC voltage having the frequency f3 extracted by the third band pass filter 65-3.

  FIG. 24G is a diagram illustrating a voltage waveform at the node D of the connection control circuit or the accompanying control circuit 63-3.

  The voltage at the node D of the connection control circuit or the accompanying control circuit 63-3 is a voltage obtained by rectifying and smoothing the voltage at the node C. The voltage at the node D is a voltage for driving the connection circuit or the accompanying circuit 13-3.

  As described above, according to the present embodiment, by changing the frequency of the alternating voltage to be superimposed and providing a band-pass filter at the supply destination, power is selectively supplied to the connection circuit or the associated circuit of the designated device. Can supply. As a result, the supply destination of the superimposed power can be designated, and can also be used when the operating voltage of the connection circuit or the accompanying circuit voltage is different. Further, even when an additional device is installed, power can be selectively supplied to the connection circuit or the accompanying circuit via the DC bus for each additional device, so that it is not necessary to newly install another power supply line.

  In the sixth embodiment, the power conditioner 62 includes a plurality of transmission circuits 43-1 to 43-3, but is not limited thereto. For example, the AC voltages having the frequencies f1, f2, and f3 (FIG. 24B, FIG. 24D, and FIG. 24F) are converted into the band-pass filters 65-1 of the connection control circuit or the associated control circuits 63-1 to 63-3. As long as it is a transmission circuit having a function capable of generating the composite waveform shown in FIG. In this case, if the carrier wave has a frequency sufficiently higher than the highest frequency (frequency f1 in this embodiment) extracted on the band-pass filter side, the same waveform as the synthesized waveform in FIG. Is possible.

  In the sixth embodiment, the voltages supplied to the transmission circuits 43-1 to 43-3 are supplied with the voltage at the node B of the voltage bus 81 as in the first embodiment. However, the present invention is not limited to this. For example, as in the first modification of the first embodiment, the transmission circuits 43-1 to 43-3 are supplied with the DC voltage output from the DC / DC converter 41, and the respective transmission circuits have their respective frequencies. AC voltage may be generated. Similarly to the second modification of the first embodiment, the transmission circuits 43-1 to 43-3 are supplied with an AC voltage output from the system power 12, and each transmission circuit has an AC of each frequency. A voltage may be generated. Similarly to the third modification of the first embodiment, the transmission circuits 43-1 to 43-3 are supplied with the DC voltage output from the storage battery 6-1, and each of the transmission circuits has a frequency. An alternating voltage may be generated.

  In the sixth embodiment, the power conditioner 62 includes the transmission circuits 43-1 to 43-3 and the superimposing unit 84. However, the configuration is not limited thereto. For example, as in the fourth embodiment, the power conditioner 31 does not include a transmission circuit and a superimposition unit, and includes a plurality (three) of AC / AC converters each having transmission circuits 43-1 to 43-3, and It is good also as a structure which has the superimposition part 34. FIG. In this case, the superimposing unit 34 outputs a DC voltage output from the DC / DC converter 41 in the power conditioner 31 to the voltage bus 81 and an AC having a different frequency output from each of a plurality (three) of AC / AC converters. Superimpose voltage. Similarly to the fifth embodiment, the power conditioner 31 does not include a transmission circuit and a superimposing unit, and includes a plurality (three) of DC / AC converters each having a transmission circuit 43-1 to 43-3, and It is good also as a structure which has the superimposition part 34. FIG. In this case, the superimposing unit 34 outputs a DC voltage output from the DC / DC converter 41 in the power conditioner 31 to the voltage bus 81 and an AC having a different frequency output from each of a plurality (three) of DC / AC converters. Superimpose voltage.

[Modification 1 of the sixth embodiment]
In 6th Embodiment, although the electric power feeding system connected with the some apparatus was demonstrated, it is not limited to this, The electric power feeding system connected with the some storage battery, or one or more apparatuses and one or more ones The present invention can also be applied to a power supply system connected to a storage battery.

[Modification 2 of the sixth embodiment]
In the sixth embodiment, the voltage bus 81 is connected to the three control circuits 64-1 to 64-3, and the DC voltage generated by each control circuit 63-1 to 63-3 is connected to the corresponding connection circuit or associated circuit. Although supplied to the circuits 13-1 to 13-3, the present invention is not limited to this.

  For example, when the device 8-1 and the device 8-2 always operate at the same time, an oscillation circuit A that outputs an AC voltage having a frequency f1 and an oscillation circuit that outputs an AC voltage having a frequency f2 in the power conditioner 62. B is provided. The voltage bus 81 is connected to the control circuit A corresponding to the oscillation circuit A and including the bandpass filter having the pass frequency f1 and the control circuit B corresponding to the oscillation circuit B and including the bandpass filter having the pass frequency f2. Is done. Then, the DC voltage generated by the control circuit A is supplied to the connection circuit or the accompanying circuits 13-1 and 13-2, and the DC voltage generated by the control circuit B is supplied to the connection circuit or the accompanying circuit 13-3. It may be a thing.

[Modification 3 of the sixth embodiment]
In the example of FIG. 24, the superimposing unit 94 includes an alternating voltage of frequency f1 output from the first oscillation circuit 43-1, an alternating voltage of frequency f2 output from the second oscillation circuit 43-2, and a third oscillation. Although the AC voltage having the frequency f3 output from the circuit 43-3 and the DC voltage output from the bidirectional AC / DC converter 42 are superimposed, the present invention is not limited to this.

The superimposing unit 94 outputs the AC voltage having the frequency f1 output from the first oscillation circuit 43-1, the AC voltage having the frequency f2 output from the second oscillation circuit 43-2, and the output from the third oscillation circuit 43-3. It is only necessary to superimpose at least one of the AC voltages having the frequency f3 and the DC voltage output from the bidirectional AC / DC converter 42.
For example, when it is desired to operate only the device 8-2, the superimposing unit 94 uses the AC voltage having the frequency f 2 output from the second oscillation circuit 43-2 and the DC voltage output from the bidirectional AC / DC converter 42. What is necessary is just to superimpose a voltage.

[Modification 4 of the sixth embodiment]
In the sixth embodiment, since it is assumed that the connection circuits connected to the devices 8-1 to 8-3 or the accompanying circuits 13-1 to 13-3 are all driven by a DC voltage having the same magnitude. Although the first oscillation circuit 43-1, the second oscillation circuit 43-2, and the third oscillation circuit 43-3 all output AC voltages having the same amplitude, the present invention is not limited to this.

  When the magnitude of the DC voltage for driving the connection circuit or the accompanying circuits 13-1 to 13-3 is different, the first oscillation circuit 43-1, the second oscillation circuit 43-2, and the third oscillation circuit 43-3 should just output the alternating voltage of the amplitude according to the magnitude | size of the direct voltage for driving the corresponding connection circuit or the accompanying circuits 13-1 to 13-3.

  As shown in FIG. 25A, the first oscillation circuit 43-1 outputs an AC voltage having a frequency of f1 and an amplitude of 30V. As shown in FIG. 25B, the second oscillation circuit 43-2 outputs an AC voltage having a frequency of f2 and an amplitude of 48V. As shown in FIG. 25C, the second oscillation circuit 43-3 outputs an AC voltage having a frequency of f3 and an amplitude of 10V.

  For example, when driving a 15V drive connection circuit connected to the device 8-1 or the accompanying circuit 13-1, the power conditioner 62 superimposes an AC voltage with a frequency f1 and an amplitude of 30V on the DC voltage. The control circuit 64-1 that controls the connection circuit or the associated circuit 13-1 extracts an AC voltage having an amplitude of 30 V at the frequency f1 superimposed on the DC voltage, and the connection circuit or the associated circuit is obtained by the rectified and smoothed DC voltage. Drive 13-1.

  When driving a connection circuit of 24V drive connected to the device 8-2 or the accompanying circuit 13-2, the power conditioner 62 superimposes an AC voltage with a frequency of f2 and an amplitude of 48V on the DC voltage. The control circuit 64-2 that controls the connection circuit or the accompanying circuit 13-2 extracts an AC voltage having an amplitude of 48V at the frequency f2 superimposed on the DC voltage, and the connection circuit or the accompanying circuit is obtained by the rectified and smoothed DC voltage. 13-2 is driven.

  When driving the 5V drive connection circuit connected to the device 8-3 or the accompanying circuit 13-3, the power conditioner 62 superimposes an AC voltage having a frequency of f3 and an amplitude of 10V on the DC voltage. The control circuit 64-3 that controls the connection circuit or the accompanying circuit 13-3 extracts an AC voltage having an amplitude of 10 V at the frequency f3 superimposed on the DC voltage, and the connection circuit or the accompanying circuit is obtained by the rectified and smoothed DC voltage. 13-3 is driven.

[Seventh Embodiment]
FIG. 26 is a diagram illustrating a configuration of a power feeding system according to the seventh embodiment.

  The power supply system 71 is different from the power supply system 1 of the first embodiment in FIG. 1 in that the power conditioner 11, the connection control circuit, or the associated control circuits 7-1 to 7- constituting the bus voltage setting unit 701. 4 is provided with a power conditioner 79, a connection control circuit, or an associated control circuit 72-1 to 72-4 constituting the bus voltage setting unit 710. Further, in the power feeding system 1 of the first embodiment of FIG. 1, the connection control circuit or the accompanying control circuits 7-1 to 7-4 and the power conditioner 11 are connected by the control line 82. In the power supply system 71 of the seventh embodiment in FIG. 26, the connection control circuit or the accompanying control circuits 72-1 to 72-4 and the power conditioner 79 are not connected by a control line.

  FIG. 27 is a diagram illustrating the configuration of the connection control circuit or the accompanying control circuit 72-1. The configuration of the connection control circuit or the associated control circuits 72-2 and 72-3 is the same as this.

  The connection control circuit or associated control circuit 72-1 is different from the connection control circuit or associated control circuit 7-1 in FIG. 3 in that a connection circuit or associated circuit 73 is used instead of the connection circuit or associated circuit 13-1. −1.

  The connection circuit or the accompanying circuit 13-1 of the first embodiment is connected to the power conditioner 11 through the control line 82, and based on a control signal transmitted through the control line 82, the storage battery 6-1 and the voltage bus. 81 was connected or disconnected.

  On the other hand, the connection circuit or the accompanying circuit 73-1 according to the present embodiment is connected to the storage battery 6-1 and the voltage based on the voltage-current characteristics of the internal switch without depending on the control signal from the power conditioner 79. Connection to or disconnection from the bus 81 is made.

FIG. 28 is a diagram illustrating the configuration of the connection circuit or the accompanying circuit 73-1.
The connection circuit or the accompanying control circuit 73-1 includes a charge control switch SW1 and a discharge control switch SW2 formed of IGBTs.

  The gates of the charge control switch SW1 and the discharge control switch SW2 receive the DC voltage GE generated by the rectifier circuit 53-1.

  When the gate of the charge control switch SW1 is turned on, the storage battery 6-1 and the voltage bus 81 are connected, current flows from the voltage bus 81 to the storage battery 6-1, and the storage battery 6-1 is charged. When the gate of the charge control switch SW1 is turned off, the connection between the storage battery 6-1 and the voltage bus 81 is disconnected, and the storage battery 6-1 is not charged.

  When the gate of the discharge control switch SW2 is turned on, the storage battery 6-1 and the voltage bus 81 are connected, current flows from the storage battery 6-1 to the voltage bus 81, and the storage battery 6-1 is discharged. When the gate of the discharge control switch SW2 is turned off, the connection between the storage battery 6-1 and the voltage bus 81 is disconnected, and the storage battery 6-1 is not discharged.

  The command unit in the power conditioner 79 is given to the charge control switch SW1 and the discharge control switch SW2 by controlling the amplitude of the AC voltage output from the oscillation circuit during charging of the storage battery 6-1 and during power generation. The gate voltage is set to a voltage that does not cause an inrush current when the storage battery 6-1 and the voltage bus 81 are connected.

  For example, it is assumed that the charge control switch SW1 and the discharge control switch SW2 have gate-collector current characteristics as shown in FIG.

  In the switches SW1 and SW2 having such characteristics, the collector current hardly flows in the range of the gate voltage from 0V to 4V, and the collector voltage is controlled by controlling the gate voltage in the range of the gate voltage from 4V to 8V. The current can be limited to a desired current value or less.

  For example, the command unit 151 in the power conditioner 79 outputs an AC voltage with an amplitude such that the gate voltage of the switches SW1 and SW2 is 4 V or less from the oscillation circuit 43 at the beginning of the connection between the storage battery 6-1 and the voltage bus 81. Let After a certain time has elapsed, the command unit 151 in the power conditioner 79 causes the gate voltage of the switches SW1 and SW2 to gradually increase, and causes the oscillation circuit 43 to output an AC voltage having an amplitude of 8V or more.

  As described above, according to the present embodiment, it is possible to provide a power feeding system capable of connecting rated power with low loss while suppressing inrush current. Further, since the connection circuit or the accompanying circuit of the power supply system is not controlled by the control signal from the power conditioner or the like, it can be installed in a place where the control signal line cannot be wired.

[Modification 1 of the seventh embodiment]
In the seventh embodiment, a power supply system connected to a plurality of storage batteries has been described. However, the present invention is not limited to this, and a power supply system connected to a plurality of devices, one or more devices, and one or more storage batteries. It can also be applied to a power supply system connected to.

[Eighth Embodiment]
In the DC power supply system, there may occur overdischarge in which the remaining amount of the storage battery becomes equal to or less than the first specified value or overcharge in which the storage battery becomes equal to or more than the second specified value. In this embodiment, in overdischarge, the switch that controls the current flow in the charging direction is turned on, and the switch that controls the current flow in the discharging direction is turned off to allow charging but not discharge. Further, in overcharging, a switch that controls the flow of current in the discharging direction is turned on, and a switch that controls the flow of current in the charging direction is turned off so that discharging can be performed but charging is not performed. As a result, the remaining amount of the storage battery can be maintained at an appropriate value.

FIG. 30 is a diagram illustrating a configuration of a power feeding system according to the eighth embodiment.
The power supply system 74 is different from the power supply system 1 of the first embodiment in FIG. 1 in that the power conditioner 11, the connection control circuit, or the associated control circuits 7-1 to 7- constituting the bus voltage setting unit 701. 4 is provided with a power conditioner 85, a connection control circuit, or associated control circuits 82-1 to 82-4 constituting the bus voltage setting unit 711. Further, in the power feeding system 1 of the first embodiment of FIG. 1, the connection control circuit or the accompanying control circuits 7-1 to 7-4 and the power conditioner 11 are connected by the control line 82. In the power supply system 74 of the eighth embodiment in FIG. 30, the connection control circuit or the accompanying control circuits 82-1 to 82-4 and the power conditioner 85 are not connected by a control line.

FIG. 31 is a diagram illustrating the configuration of the power conditioner 85.
The power conditioner 85 of FIG. 31 is different from the power conditioner 11 of the first embodiment of FIG. 2 in that instead of the oscillation circuit 43 and the superimposing unit 44, the first oscillation circuit 93-1, the second oscillation The circuit 93-2 and the superimposing unit 84 are provided.

  The first oscillation circuit 93-1 is supplied with the voltage at the node B of the voltage bus 81, and generates an AC voltage having the frequency f1. The second oscillation circuit 93-2 is supplied with the voltage at the node B of the voltage bus 81, and generates an AC voltage having a frequency f2. f1 and f2 are different.

  The superimposing unit 84 outputs the AC voltage having the frequency f1 output from the first oscillation circuit 93-1, the AC voltage having the frequency f2 output from the second oscillation circuit 93-2, and the DC / DC converter 41. DC voltage (DC400V) is superimposed.

  Command unit 151 causes first oscillation circuit 93-1 to generate an alternating voltage of frequency f 1 when charging storage batteries 6-1 to 6-4, for example, when the remaining capacity of the storage battery becomes equal to or less than the first specified value. . When discharging the storage batteries 6-1 to 6-4, for example, when the remaining amount of the storage battery becomes equal to or greater than the second specified value, the command unit 151 applies an alternating voltage of frequency f2 to the second oscillation circuit 93-2. Generate.

  FIG. 32 is a diagram showing the configuration of the connection control circuit or the accompanying control circuit 82-1. The configuration of the connection control circuit or the accompanying control circuits 82-2 and 82-3 is the same as this.

  The connection control circuit or associated control circuit 82-1 is different from the connection control circuit or associated control circuit 7-1 of FIG. 3 in that it includes two rectifier circuits 89-A and 89-B.

  The rectifier circuit 89-A includes a first band pass filter 65-A similar to the first band pass filter 65-1 included in the rectifier circuit 68-1 of FIG. The rectifier circuit 89-B includes a second bandpass filter 65-B similar to the second bandpass filter 65-2 included in the rectifier circuit 68-2 of FIG.

  The first band pass filter 65-A is provided between one end of the capacitor C2 and one end of the capacitor C3 in the rectifier circuit 89-A, and between the other end of the capacitor C2 and one end of the capacitor C4. The first band pass filter 65-A passes an AC voltage having a frequency f1. The AC voltage having the frequency f1 is rectified and smoothed by the diode bridge 52 and the smoothing capacitor C1 in the rectifier circuit 89-A, and the DC voltage GE1 is supplied to the connection circuit or the accompanying circuit 173-1.

  The second band pass filter 65-B is provided between one end of the capacitor C2 and one end of the capacitor C3 in the rectifier circuit 89-B, and between the other end of the capacitor C2 and one end of the capacitor C4. The second band pass filter 65-B passes the AC voltage having the frequency f2. The AC voltage having the frequency f2 is rectified and smoothed by the diode bridge 52 and the smoothing capacitor C1 in the rectifier circuit 89-B, and the DC voltage GE2 is supplied to the connection circuit or the accompanying circuit 173-1.

FIG. 33 is a diagram illustrating the configuration of the connection circuit or the accompanying circuit 173-1.
The connection circuit or the accompanying control circuit 173-1 includes a charge control switch SW1 and a discharge control switch SW2 formed of an IGBT.

  The DC voltage GE1 generated by the rectifier circuit 89-A is received at the gate of the charge control switch SW1. When the gate of the charge control switch SW1 is turned on, the storage battery 6-1 and the voltage bus 81 are connected, current flows from the voltage bus 81 to the storage battery 6-1, and the storage battery 6-1 is charged. When the gate of the charge control switch SW1 is turned off, the connection between the storage battery 6-1 and the voltage bus 81 is disconnected, and the storage battery 6-1 is not charged.

  The DC voltage GE2 generated by the rectifier circuit 89-B is received at the gate of the discharge control switch SW2. When the gate of the discharge control switch SW2 is turned on, the storage battery 6-1 and the voltage bus 81 are connected, current flows from the storage battery 6-1 to the voltage bus 81, and the storage battery 6-1 is discharged. When the gate of the discharge control switch SW2 is turned off, the connection between the storage battery 6-1 and the voltage bus 81 is disconnected, and the storage battery 6-1 is not discharged.

  As in the seventh embodiment, the command unit 151 in the power conditioner 85 controls the amplitude of the AC voltage output from the first oscillation circuit 93-1, thereby providing the gate voltage applied to the charge control switch SW1. GE1 is set to a voltage that does not generate inrush power when the storage battery 6-1 and the voltage bus 81 are connected.

  As in the seventh embodiment, the command unit 151 in the power conditioner 85 controls the amplitude of the AC voltage output from the second oscillation circuit 93-2, thereby providing the gate voltage applied to the discharge control switch SW2. GE2 is set to a voltage that does not generate inrush power when the storage battery 6-1 and the voltage bus 81 are connected.

  FIG. 34 is a diagram illustrating voltage waveforms at a plurality of locations in the case where the power conditioner 85 superimposes AC voltages having frequencies f1 and f2 on a DC voltage.

FIG. 34A shows a voltage waveform at node B. FIG.
The voltage at the node B is obtained from the AC voltage having the frequency f1 output from the first oscillation circuit 93-1, the AC voltage having the frequency f2 output from the second oscillation circuit 93-2, and the bidirectional AC / DC converter 42. This is a voltage in which the output DC voltage is superimposed.

  FIG. 34B is a diagram illustrating a voltage waveform at the node C of the rectifier circuit 89-A of the connection control circuit or the accompanying control circuit 82-1.

  The voltage at the node C of the rectifier circuit 89-A is an AC voltage having the frequency f1 extracted by the first bandpass filter 65-A.

  FIG. 34C is a diagram illustrating a voltage waveform at the node D of the rectifier circuit 89-A of the connection control circuit or the accompanying control circuit 82-1.

  The voltage at the node D of the rectifier circuit 89-A is a voltage obtained by rectifying and smoothing the voltage at the node C. The voltage GE1 of the node D is sent to the gate of the charge control switch SW1 in the connection circuit or the accompanying circuit 173-1.

  FIG. 34D is a diagram illustrating a voltage waveform at the node C of the rectifier circuit 89-B of the connection control circuit or the accompanying control circuit 82-1.

  The voltage at the node C of the rectifier circuit 89-B is an AC voltage having the frequency f2 extracted by the second bandpass filter 65-B.

  FIG. 34E shows a voltage waveform at node D of the rectifier circuit 89-B of the connection control circuit or the accompanying control circuit 82-1.

  The voltage at the node D of the rectifier circuit 89-B is a voltage obtained by rectifying and smoothing the voltage at the node C. The voltage GE2 of the node D is sent to the gate of the discharge control switch SW2 in the connection circuit or the accompanying circuit 173-1.

  As described above, according to the present embodiment, a DC power feeding system that transmits DC power generated by a distributed power supply device such as a solar battery to equipment or a storage battery through a DC bus without converting DC power into AC. When connecting or expanding the storage battery, connection and disconnection between the DC bus and the storage battery or equipment can be controlled independently in the charge direction and the discharge direction, and the inrush current can be controlled at the time of connection with a simple configuration.

[Modification 1 of Eighth Embodiment]
In the eighth embodiment, the power supply system connected to a plurality of storage batteries has been described. However, the present invention is not limited to this, and the power supply system connected to a plurality of devices, or one or more devices and one or more power supplies. The present invention can also be applied to a power supply system connected to a storage battery.

[Modification 2 of Eighth Embodiment]
In the eighth embodiment, the voltage bus 81 is connected to four control circuits, and the DC voltage generated by each control circuit is supplied to the corresponding connection circuit or associated circuit. However, the present invention is not limited to this. .

  For example, the voltage bus 81 may be connected to one control circuit, and a DC voltage generated by one control circuit may be supplied to four connection circuits or associated circuits. Further, the voltage bus 81 is connected to the two control circuits A and B, the DC voltage generated by the control circuit A is supplied to the two connection circuits or the accompanying circuits, and the DC voltage generated by the control circuit B is It may be supplied to the remaining two connection circuits or associated circuits.

In addition, a part of the contents described in the embodiment will be described below.
(1) Claim A
A voltage bus;
A bus voltage setting unit that changes the voltage of the voltage bus to a voltage in which the AC voltage is superimposed on the DC voltage, based on the DC voltage generated by the distributed power supply and the AC voltage;
A control circuit that extracts an AC voltage from the voltage of the voltage bus and generates a DC voltage from the AC voltage;
A power supply system comprising: a connection circuit that connects or disconnects a device or a storage battery and the voltage bus, or an associated circuit that controls the device or the storage battery, wherein the generated DC voltage is supplied as an operating voltage.

  According to the present invention, a stable voltage for operating the connection circuit or the associated circuit can be generated.

(2) Claim B
The bus voltage setting unit includes:
The power feeding system according to claim A, further comprising a power conditioner that superimposes an AC voltage on a DC voltage generated by the distributed power source and outputs the superimposed voltage to the voltage bus.

  According to the present invention, it is possible to superimpose the DC voltage and the AC voltage path of the distributed power supply in the power conditioner.

(3) Claim C
A plurality of the devices or the storage batteries are provided,
The connection circuit or the accompanying circuit is provided for each device or the storage battery,
The control circuit is provided for each of the connection circuit or the accompanying circuit,
The power supply system according to claim B, wherein each control circuit supplies the DC voltage to a corresponding connection circuit or an associated circuit.

  According to the present invention, one device or a storage battery can be connected to one connection circuit or an accompanying circuit, and one connection circuit or an accompanying circuit can be connected to one control circuit.

(4) Claim D
A plurality of the devices or the storage batteries are provided,
The control circuit is provided for each of the connection circuits or the associated circuits, or for each of a plurality of connection circuits or associated circuits,
The power supply system according to claim B, wherein each control circuit supplies the DC voltage to one or a plurality of corresponding connection circuits or associated circuits.

  According to the present invention, one device or a storage battery can be connected to one connection circuit or an accompanying circuit, and one or a plurality of connection circuits or an accompanying circuit can be connected to one control circuit.

(5) Claim E
The inverter is
An oscillation circuit that generates the AC voltage using the voltage of the voltage bus;
The power feeding system according to claim B, further comprising: an alternating voltage output from the oscillation circuit; and a superimposing unit that superimposes the direct current voltage generated by the distributed power source.

According to the present invention, an AC voltage can be generated using the voltage of the voltage bus.
(6) Claim F
The inverter is connected to the grid,
An oscillation circuit that generates the AC voltage using a voltage from the system;
The power feeding system according to claim B, further comprising: an alternating voltage output from the oscillation circuit; and a superimposing unit that superimposes the direct current voltage generated by the distributed power source.

According to the present invention, an AC voltage can be generated using a system voltage.
(7) Claim G
The power supply system is connected to the storage battery,
The inverter is
An oscillation circuit that generates the AC voltage using the voltage of the storage battery;
The power feeding system according to claim B, further comprising: an alternating voltage output from the oscillation circuit; and a superimposing unit that superimposes the direct current voltage generated by the distributed power source.

According to this invention, an alternating voltage can be generated using the voltage of the storage battery.
(8) Claim H
The bus voltage setting unit includes:
A power conditioner that outputs a DC voltage generated by the distributed power source to the voltage bus;
An AC / AC converter that converts an AC voltage from the system into a low AC voltage;
The power feeding system according to claim A, further comprising: a superimposing unit that superimposes an AC voltage generated by the AC / AC converter on a voltage of the voltage bus.

  According to the present invention, the voltage obtained by down-converting the AC voltage from the system can be superimposed on the voltage of the voltage bus.

(9) Claim I
The bus voltage setting unit includes:
A power conditioner that superimposes an AC voltage on the DC voltage generated by the distributed power supply and outputs the voltage to the voltage bus;
An AC / AC converter that converts an AC voltage from the system into a low AC voltage;
The power feeding system according to claim A, further comprising: a superimposing unit that superimposes an AC voltage generated by the AC / AC converter on a voltage of the voltage bus.

  According to the present invention, the voltage obtained by down-converting the AC voltage from the system can be superimposed on the voltage of the voltage bus in which the AC voltage is superimposed on the DC voltage generated by the distributed power source output from the power conditioner.

(10) Claim J
The bus voltage setting unit includes:
A switch,
A power conditioner that superimposes an AC voltage on a DC voltage generated by a distributed power supply and outputs the voltage to the voltage bus via the switch;
An AC / AC converter that converts an AC voltage from the system into a low AC voltage;
The power feeding system according to claim A, further comprising: a superimposing unit that superimposes an AC voltage generated by the AC / AC converter on a voltage of the voltage bus.

  According to the present invention, when it is desired to operate a DC load with the electric power from the storage battery, the switch is turned off so that the voltage from the power conditioner is not supplied to the voltage bus.

(11) Claim K
The AC / AC converter performs the conversion when the switch is off;
The power feeding system according to claim J, wherein the superposition unit performs superposition of the AC voltage when the switch is off.

  According to the present invention, when the switch is turned off, the voltage obtained by down-converting the AC voltage from the system can be superimposed on the voltage of the voltage bus.

(12) Claim L
The power feeding system according to any one of claims A to K, wherein the power feeding system includes the device or the storage battery.

According to the present invention, the power supply system can include a device or a storage battery.
(13) Claim M
With a storage battery,
The bus voltage setting unit includes:
A power conditioner that outputs a DC voltage generated by a distributed power supply to the voltage bus;
A DC / AC converter for converting a DC voltage from the storage battery into an AC voltage;
The power feeding system according to claim A, further comprising: a superimposing unit that superimposes an AC voltage generated by the DC / AC converter on a voltage of the voltage bus.

  According to the present invention, an AC voltage obtained by DC / AC conversion of a DC voltage from a storage battery can be superimposed on the voltage of the voltage bus.

(14) Claim N
With a storage battery,
The bus voltage setting unit includes:
A power conditioner that superimposes an AC voltage on a DC voltage generated by a distributed power supply and outputs the voltage to the voltage bus;
A DC / AC converter for converting a DC voltage from the storage battery into an AC voltage;
The power feeding system according to claim A, further comprising: a superimposing unit that superimposes an AC voltage generated by the DC / AC converter on a voltage of the voltage bus.

  According to the present invention, an AC voltage obtained by DC / AC conversion of a DC voltage from a storage battery can be superimposed on a voltage of a voltage bus in which an AC voltage is superimposed on a DC voltage generated by a distributed power source output from a power conditioner. .

(15) Claim O
With a storage battery,
The bus voltage setting unit includes:
A switch,
A power conditioner that superimposes an AC voltage on a DC voltage generated by a distributed power supply and outputs the voltage to the voltage bus via the switch;
A DC / AC converter for converting a DC voltage from the storage battery into an AC voltage;
The power feeding system according to claim A, further comprising: a superimposing unit that superimposes an AC voltage generated by the DC / AC converter on a voltage of the voltage bus.

  According to the present invention, when it is desired to operate a DC load with the electric power from the storage battery, the switch is turned off so that the voltage from the power conditioner is not supplied to the voltage bus.

(16) Claim P
The DC / AC converter performs the conversion when the switch is off;
The power feeding system according to claim O, wherein the superposition unit performs superposition of the AC voltage when the switch is off.

  According to the present invention, when the switch is turned off, an AC voltage obtained by DC / AC conversion of the DC voltage from the storage battery can be superimposed on the voltage of the voltage bus.

(17) Claim Q
The bus voltage setting unit generates AC voltages having different frequencies, and superimposes at least one AC voltage of a plurality of the DC voltages generated by the distributed power source,
A plurality of the devices or the storage batteries are provided,
The connection circuit or the accompanying circuit is provided for each device or the storage battery,
The control circuit is provided for each of the connection circuits or the associated circuits, or for each of the plurality of connection circuits or the associated circuits, and is provided for each of the generated AC voltages.
Each control circuit supplies the DC voltage to one or more corresponding connection circuits or associated circuits,
Each control circuit includes a band-pass filter that passes the frequency component of the alternating voltage output from the corresponding oscillation circuit included in the superimposed voltage,
The power supply system according to claim A, wherein each control circuit supplies the DC voltage to a corresponding connection circuit or an associated circuit.

  According to this invention, only a specific connection circuit or an accompanying circuit can be driven, and the apparatus or storage battery connected to it can be operated.

(18) Claim R
The power feeding system according to claim Q, wherein each of the oscillation circuits outputs an AC voltage having an amplitude corresponding to a DC voltage for driving a corresponding connection circuit or an associated circuit.

  According to the present invention, it is possible to operate even when the driving voltage differs for each connection circuit or associated circuit.

(19) Claim S
The power supply according to claim B, wherein the connection circuit or the accompanying circuit includes a switch that is provided between the voltage bus and the device or the storage battery and that is controlled to be opened and closed by a DC voltage sent from the control circuit. system.

  According to the present invention, the connection between the voltage bus and the device or the storage battery can be controlled by the DC voltage sent from the control circuit without using the control signal from the control line.

(20) Claim T
The power supply system according to claim S, wherein the power conditioner controls the amplitude of the superimposed AC voltage so that an inrush current does not flow when the device or the storage battery is connected to the voltage bus.

  According to the present invention, it is possible to prevent an inrush current from flowing when the device or the storage battery is connected to the voltage bus.

(21) Claim U
The power conditioner includes a first oscillation circuit and a second oscillation circuit as the oscillation circuit, and each oscillation circuit generates an alternating voltage having a frequency different from each other,
The superimposing unit superimposes an AC voltage output from at least one of two oscillation circuits and a DC voltage generated by the distributed power source,
The connection circuit or the accompanying circuit is provided for each device or the storage battery,
The control circuit is provided for each of the connection circuits or the associated circuits, or for each of the plurality of connection circuits or the associated circuits.
Each control circuit supplies the DC voltage to a corresponding one or connection circuit or associated circuit,
Each control circuit
A first rectifier circuit that passes a frequency component of an AC voltage output from the first oscillation circuit included in the superimposed voltage, rectifies and smoothes, and outputs a first DC voltage;
A second rectifier circuit that passes the frequency component of the AC voltage output from the second oscillation circuit included in the superimposed voltage, rectifies and smoothes, and outputs a second DC voltage;
The connection circuit or the accompanying circuit is
A first switch provided between the voltage bus and a corresponding device or storage battery, the opening and closing of which is controlled by the first DC voltage sent from a corresponding control circuit;
A second switch provided between the voltage bus and a corresponding device or storage battery and controlled to be opened and closed by the second DC voltage sent from a corresponding control circuit;
The current from the device or the storage battery to the voltage bus flows through the first switch, and the current from the voltage bus to the device or the storage battery flows through the second switch. Power supply system.

  According to the present invention, the battery can be charged but not discharged in overdischarge, and the overcharge can be discharged but not charged, so that the remaining amount of storage battery can be maintained at an appropriate value.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1, 2, 3, 4, 5, 61, 71, 74, 404, 405, 504, 505, 400 Power feeding system, 6-1 to 6-4 storage battery, 7-1 to 7-4, 63-1 to 63 -3, 72-1 to 72-4, 82-1 to 82-4 Connection control circuit or accompanying control circuit, 8-1 to 8-4 equipment, 10 solar cell, 11, 31, 62, 79, 85, 101 , 102, 103 Power conditioner, 12 system power, 13-1 to 13-4, 73-1, 173-1 Connection circuit or associated circuit, 14, 14-1, 64-1 to 64-3, 114-1 Control circuit, 32 AC / AC converter, 33 DC / AC converter, 41 DC / DC converter, 42 Bidirectional AC / DC converter, 43, 43-1 to 43-3, 93-1, 93-2 Oscillator circuit, 44 , 34, 84, 3 40 superposition part, 52 diode bridge, 53, 68-1 to 68-3, 89-A, 89-B rectifier circuit, 59 transformer, 65-1 to 65-3 band pass filter, 81 voltage bus, 82 control line, 99 DC load, 151 command unit, D1-D4 diode, R1-R4 resistance element, 65-A, 65-B, C1-C6 capacitor, SWA, SW1, SW2 switch, 701-711 bus voltage setting unit.

Claims (5)

A voltage bus;
A bus voltage setting unit that changes the voltage of the voltage bus to a voltage in which the AC voltage is superimposed on the DC voltage, based on the DC voltage generated by the distributed power supply and the AC voltage;
A control circuit that extracts an AC voltage from the voltage of the voltage bus and generates a DC voltage from the AC voltage;
A power supply system comprising: a connection circuit that connects or disconnects a device or a storage battery and the voltage bus, or an associated circuit that controls the device or the storage battery, wherein the generated DC voltage is supplied as an operating voltage. The bus voltage setting unit includes:
The power supply system according to claim 1, further comprising a power conditioner that superimposes an AC voltage on a DC voltage generated by the distributed power source and outputs the superimposed voltage to the voltage bus. The inverter is
An oscillation circuit that generates the AC voltage using the voltage of the voltage bus;
The power feeding system according to claim 2, comprising: an alternating voltage output from the oscillation circuit; and a superimposing unit that superimposes a direct current voltage generated by the distributed power source. The bus voltage setting unit generates AC voltages having different frequencies, and superimposes at least one AC voltage of a plurality of the DC voltages generated by the distributed power source,
A plurality of the devices or the storage batteries are provided,
The connection circuit or the accompanying circuit is provided for each device or the storage battery,
The control circuit is provided for each of the connection circuits or the associated circuits, or for each of the plurality of connection circuits or the associated circuits, and is provided for each of the generated AC voltages.
Each control circuit supplies the DC voltage to one or more corresponding connection circuits or associated circuits,
Each control circuit includes a band-pass filter that passes the frequency component of the alternating voltage output from the corresponding oscillation circuit included in the superimposed voltage,
The power supply system according to claim 1, wherein each control circuit supplies the DC voltage to a corresponding connection circuit or an associated circuit. The power conditioner includes a first oscillation circuit and a second oscillation circuit as the oscillation circuit, and each oscillation circuit generates an alternating voltage having a frequency different from each other,
The superimposing unit superimposes an AC voltage output from at least one of two oscillation circuits and a DC voltage generated by the distributed power source,
The connection circuit or the accompanying circuit is provided for each device or the storage battery,
The control circuit is provided for each of the connection circuits or the associated circuits, or for each of the plurality of connection circuits or the associated circuits.
Each control circuit supplies the DC voltage to a corresponding one or connection circuit or associated circuit,
Each control circuit
A first rectifier circuit that passes a frequency component of an AC voltage output from the first oscillation circuit included in the superimposed voltage, rectifies and smoothes, and outputs a first DC voltage;
A second rectifier circuit that passes the frequency component of the AC voltage output from the second oscillation circuit included in the superimposed voltage, rectifies and smoothes, and outputs a second DC voltage;
The connection circuit or the accompanying circuit is
A first switch provided between the voltage bus and a corresponding device or storage battery, the opening and closing of which is controlled by the first DC voltage sent from a corresponding control circuit;
A second switch provided between the voltage bus and a corresponding device or storage battery and controlled to be opened and closed by the second DC voltage sent from a corresponding control circuit;
The current from the device or the storage battery to the voltage bus flows through the first switch, and the current from the voltage bus to the device or the storage battery flows through the second switch. Power supply system.

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