JP2011050131A - Residential power supply system, and power supply controller therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a residential power supply system for storing power of a commercial AC power supply into a storage battery and enabling loads to use the stored power during the daytime, capable of selling the power in compliance with a power supply contract with a power company. <P>SOLUTION: The power feeding system includes a mode for supplying power of a commercial AC power supply (4) to a load (3) and storing the power in a power storage battery (23) at a time zone when power rate is most expensive, a mode for supplying the stored power to the load (3) and selling power from a natural energy generator (1) at a time zone when the power rate is inexpensive, a mode for supplying the power from the generator (1) and the commercial AC power supply (4) to the load (3) if the power from the power storage battery (23) becomes short in the load (3) side, and a mode for supplying the stored power to the load (3) when the generator does not generate power at power failure, supplying the stored power to the load (3) and storing power in the power storage battery (23) while the generator (1) generates power. The modes are each switched by the power feed controller (2) in accordance with a time schedule, or switched at power failure or not at power failure. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a residential power supply system and a power supply control device constituting the same. More specifically, using a natural energy power generation device, a storage battery, and a commercial AC power supply, the commercial power in the nighttime power supply time zone is stored in the storage battery, and the stored power is used on the load side in the daytime. In the residential power supply system, the residential power supply system that can perform power sale by reversely flowing power to the commercial AC power source in conformity with the power sale contract with the domestic power company and the power supply constituting the same The present invention relates to a control device.

  The power generation facilities of electric power companies are prepared to handle the maximum power consumption during summer daytime. For this reason, surplus power that cannot be consumed is generated at night. This surplus power is eventually discarded as heat and disappears. In order to reduce this surplus power, electric power companies are taking measures such as setting the nighttime electricity rate at a low price to promote its use, stopping some of the power generation facilities, and reducing the output. .

  However, the latter measure results in operating the generator with low efficiency, resulting in a significant loss of energy. In particular, in the operation of nuclear power generation facilities, the output is not changed from the viewpoint of safety, and the same output operation as in the daytime is performed at night. For this reason, even if adjustments as described above are made, a large amount of surplus power still occurs at night, and a great deal of energy is lost in vain.

  In order to improve such a situation, patent document as an example of a power feeding system that combines natural energy system power with a large variation factor and stable power such as midnight power, and effectively uses surplus power to save energy 1 is a “distributed power supply system”.

  This system uses a bidirectional DC-DC converter and a two-winding electronic transformer using at least one of a wind power generator, a solar power generator, and a fuel cell, a storage battery, and a commercial-side AC power supply, or This is a system that performs distributed power supply to the load side without going through, and at the time of full storage of the storage battery or power failure of the commercial AC power supply, the DC power from the DC power source and the storage battery is converted into a bidirectional DC-DC converter and two-winding electronics A sine wave AC output is generated using a transformer and supplied to the AC dedicated load.When the battery discharges, the power is supplied from the wind power generator, solar power generator, and fuel cell to the battery to supply power at night and midnight. During the time period, AC power from the commercial AC power supply is supplied to the AC dedicated load and the storage battery is stored. There If not a power failure is that to reverse power flow to the commercial side AC power supply to convert DC to AC power.

JP2004-80987

However, the conventional distributed power supply system has the following problems.
That is, in this distributed power supply system, as described above, when the storage battery is close to full storage at light load and the commercial AC power supply is not out of power, the electric power from the commercial AC power supply is stored during the night / midnight power supply time period. From the storage battery, power is sold by flowing power back to the commercial AC power source.

  However, at present, in a power sale contract with a domestic power company, it is not permitted to store night / midnight power supplied from commercial AC power and to reverse this power to commercial AC power. Therefore, it is naturally not permitted to store the natural energy power, the power from the fuel cell, etc. and the power supplied from the commercial AC power source in the same storage battery, and reversely flow this to the commercial AC power source. Thus, the distributed power supply system could not substantially sell power supplied from the storage battery.

(Object of the present invention)
The present invention uses a natural energy power generation device such as a solar power generation device, a storage battery, and a commercial-side AC power source to store power from a commercial-side AC power source during a midnight power supply time period in a storage battery. In a residential power supply system that enables power to be used on the load side during the day, power is sold by reversely flowing power to a commercial AC power source in compliance with a power sale contract with a domestic power company. An object of the present invention is to provide a residential power supply system and a power supply control device constituting the same.

Means taken by the present invention to solve the above problems are as follows.
The present invention
A residential power supply system that includes a natural energy power generation device, a commercial AC power supply, and a power supply control device including a storage battery, and supplies power to the load side,
A power storage operation mode for supplying AC power from the commercial AC power source to the load side and converting AC current to DC current and storing it in the storage battery in a time zone where the electricity charge of the commercial AC power source is the cheapest,
During the time when the electricity charge of the commercial AC power supply is expensive, the DC current discharged from the storage battery is converted to AC current and supplied to the load side, and the AC power from the natural energy generator is supplied to the commercial AC power supply side. A power selling operation mode in which power is sold by reverse current flow,
Including
In the power selling operation mode, when the power supplied by the discharge is insufficient on the load side when discharging from the storage battery, the supplement is performed to supply AC power from the natural energy power generation device and the commercial side AC power source to the load side. Including operation mode,
Furthermore, when the commercial AC power supply is blackout,
When the natural energy generator is not generating power, the direct current discharged from the storage battery is converted to an alternating current and supplied to the load side. While supplying AC power from the energy system power generator to the load side, the operation mode during a power failure that converts AC current into DC current and stores it in the storage battery,
Have
Each mode is switched by the power supply control device according to a preset time schedule, or is switched during a power failure / no power failure,
This is a residential power supply system.

The present invention
When the natural energy generator does not generate electricity during the time when the electricity charge of the commercial AC power supply is low, supply the AC power from the commercial AC power source to the load side and the natural energy generator generates power. When there is a secondary power selling operation mode in which the AC power from the natural energy power generation device is supplied to the load side, and the power is sold by reverse flow to the commercial AC power source side,
The power supply system for houses.

The present invention
The power supply control device is a commercial power failure changeover switch that switches between a commercial AC power source or an AC current output side of a natural energy power generation device and an AC current output side during a self-sustaining operation of the natural energy power generation device.
A timer switch that switches ON / OFF of an electrical path from the commercial power failure changeover switch to the storage converter according to a preset time schedule;
A storage converter that converts alternating current into direct current;
A storage battery for storing the electric power converted into direct current by the storage converter;
A discharge inverter that converts a direct current discharged from the storage battery into an alternating current; and
An output power supply switching switch for switching between an electrical path through which an alternating current supplied from the discharging inverter passes and an electrical path through which the alternating current passing through the switch during commercial power failure is directly connected to the load side;
It is the said electric power feeding system for houses provided with.

The present invention
A power supply control device constituting a residential power supply system having a natural energy power generation device, a commercial AC power supply, and a power supply control device including a storage battery,
A commercial power failure changeover switch that switches between the AC power output side of the commercial AC power supply or the natural energy power generator and the AC current output side during the self-sustaining operation of the natural energy power generator,
A timer switch that switches ON / OFF of an electrical path from the commercial power failure changeover switch to the storage converter according to a preset time schedule;
A storage converter that converts alternating current into direct current;
A storage battery for storing the electric power converted into direct current by the storage converter;
A discharge inverter that converts a direct current discharged from the storage battery into an alternating current; and
An output power supply switching switch for switching between an electrical path through which an alternating current supplied from the discharging inverter passes and an electrical path through which the alternating current passing through the switch during commercial power failure is directly connected to the load side;
A power supply control device.

  The “natural energy power generation device” referred to in the present invention is, for example, wind power generation or solar power generation. In addition, if a natural energy type | system | group electric power generating apparatus is an apparatus which can generate electric power using natural energy, it will not be limited to these.

  In each domestic power company, electricity charges are divided into three stages according to the time zone, for example, 10: 00-17: 00 (daytime), 7: 00-10: 00 (morning) and 17: 00-23 : 00 (night) and 23: 00-7: 00 (night). The hours from 10:00 to 17:00 (daytime) correspond to the “hours when electricity charges are expensive” in the claims, and from 7:00 to 10:00 (morning) and from 17:00 to 23:00 The (evening) time zone is also equivalent to the “hours when electricity charges are cheap”, and the time zone from 17:00 to 23:00 (evening) is also equivalent to the “hours when electricity rates are cheapest”.

  As an example of the difference in electricity charges in each time zone, if the charge in the summer daytime (hours where electricity charges are expensive) is 100, the morning and evening hours (electricity charges are cheaper) The charge for the night time zone is 69.3, and the charge for the night time zone (the time zone where the electricity bill is the cheapest) is 27.5.

(Function)
The operation of the residential power supply system according to the present invention will be described. Here, the constituent elements used in the description are assigned in correspondence with the reference numerals given to the respective parts in the embodiments described later. These reference numerals are the same as the reference numerals described in the claims of the claims. Similarly, it is only for the purpose of facilitating understanding of the contents, and the meaning of each component is not limited to the above-described parts.

The residential power supply system supplies the AC power from the commercial AC power supply (4) to the load side (3) during the time when electricity is the cheapest, for example, from 23:00 to 7:00. Then, alternating current is converted to direct current and stored in the storage battery (23).
In addition, when the electricity bill is expensive, for example, from 10:00 to 17:00, the direct current discharged from the storage battery (23) is converted into alternating current and supplied to the load side (3). Then, the AC power from the natural energy generator (1) is reversely flowed to the commercial AC power supply (4) side to sell power.
As described above, the residential power supply system according to the present invention performs power sale by causing power to flow backward to the commercial AC power supply (4) side in accordance with a surplus power sale contract with a domestic power company. Can do.

When discharging from the storage battery (23), if the power supplied by the discharge is insufficient on the load side (3), from the natural energy power generation device (1) and the commercial side AC power supply (4) to the load side (3) Supply AC power to
When the commercial AC power supply (4) fails and the natural energy generator (1) is not generating power, the DC current discharged from the storage battery (23) is converted to AC current and transferred to the load side (3). Supply.
In addition, when the natural energy generator (1) is generating power during a power failure, AC power from the natural energy generator (1) is supplied to the load side (3), and the AC current is converted to DC current. Conversion is performed to store electricity in the storage battery (23).

Residential power supply systems equipped with a secondary power operation mode can be used for renewable energy generators (e.g., 7: 00-10: 00, 17: 00-23: 00) when electricity charges are cheap. When 1) is not generating power, AC power is supplied from the commercial AC power source (4) to the load side, and when the natural energy generator (1) is generating power, the natural energy generator (1 ) Can be supplied to the load side (3), and the power can be sold by flowing backward to the commercial AC power source side (4).
Also in this case, it is in a form that complies with a surplus power sales contract with an electric power company, and power can be sold without any trouble.

  The power supply control device constituting the residential power supply system according to the present invention is a commercial-side AC power source in a midnight power supply time zone using a natural energy power generation device such as a solar power generation device, a storage battery, and a commercial-side AC power source. In the residential power supply system that stores the power from the battery in the storage battery and can use the stored power on the load side in the daytime, the AC power from the natural energy generator is supplied to the commercial AC power source. Since the power is reversed, power can be sold to a commercial AC power source in compliance with a power sale contract with a domestic power company.

Explanatory drawing which shows one Embodiment of the electric power feeding system for houses which concerns on this invention. The block diagram which shows one Embodiment of the electric power feeding control apparatus which concerns on this invention. Explanatory drawing which shows the control (1) in the time slot | zone of 7: 00-10: 00 and 17: 00-23: 00. Explanatory drawing which shows the control (2) in the time slot | zone of 7: 00-10: 00 and 17: 00-23: 00. Explanatory drawing which shows the control (1) in the time slot | zone of 10: 00-17: 00. Explanatory drawing which shows the control (2) in the time slot | zone of 10: 00-17: 00. Explanatory drawing which shows the control in the time zone of 23: 00-7: 00. Explanatory drawing which shows the control (1) at the time of a power failure of commercial side AC power supply. Explanatory drawing which shows the control (2) at the time of a power failure of commercial side AC power supply.

  The present invention will be described in detail based on the embodiments shown in the drawings.

Please refer to FIG.
The residential power supply system S includes a solar power generation device 1, a power supply control device 2, a switchboard 3, and a commercial AC power supply 4.

  The solar power generation device 1 includes a solar cell module 10. The solar cell module 10 converts sunlight (light energy) into electric power by the photovoltaic effect, and is a panel that creates a necessary voltage and current by connecting a plurality of cells in series in parallel.

  The direct current generated by the solar cell module 10 is sent to the input unit 120 of the power conditioner 12 through the wiring 50. A connection unit 11 is provided in the path of the wiring 50. The connection unit 11 sorts the output cable of the solar cell module 10 according to the system, and supplies a direct current with no voltage variation to the power conditioner 12.

  The power conditioner 12 converts a direct current generated by the solar cell module 10 into an alternating current, and outputs an alternating current of 103 V from the output unit 121. However, the current varies depending on the amount of power generated. Further, in the self-sustaining operation at the time of a power failure of the commercial-side AC power supply 4, 100 V AC current is output from the output unit 122.

  The wiring 51 from the output part 121 of the power conditioner 12 is connected to a path of a wiring 52 that leads from a surplus power watt-hour meter 30 to be described later to the main leakage breaker 31. A power generation leakage breaker 13 is provided. The solar power leakage breaker 13 is a breaker dedicated to the solar power generation device 1.

  A wire 54 connected to the outlet 14 for independent operation is connected to the route of the wire 53 connected from the output unit 122 of the power conditioner 12 to the commercial power failure changeover switch 20 described later. The stand-alone operation outlet 14 is provided only at one location such as indoors on the user side. 100V alternating current is supplied to the outlet 14 for exclusive use of independent operation, when the solar power generation device 1 is autonomously operated at the time of a power failure of the commercial AC power supply 4.

The solar power generation device 1 is connected to the watt-hour meter 40 and the contract power controller 41 of the commercial AC power source 4 owned by the power company as follows.
As described above, the wiring 51 from the output unit 121 is connected to the path of the wiring 52 that leads from the watt-hour meter 30 for surplus power to the main leakage breaker 31. One end of the wiring 52 is connected to the input unit 300 by providing the contract power controller 41 in the path to the portion to which the wiring 51 is connected. The contract power controller 41 is a breaker that controls the user power contract ampere.

  One end of a wiring 55 is connected to the output unit 301 of the surplus power watt-hour meter 30. The other end of the wiring 55 is connected to the output unit 401 of the watt-hour meter 40 for power purchase. A wiring 56 from the commercial AC power supply 4 is connected to the input unit 400 of the watt-hour meter 40 for power purchase.

The configuration of the power supply control device 2 will be described with reference to FIGS. 1 and 2.
The power feeding control device 2 includes a commercial power failure changeover switch 20. In the commercial power failure changeover switch 20, the wiring 53 from the output unit 122 of the power conditioner 12 is introduced through the photovoltaic power generation self-sustained operation power input terminal 26 as described above. In addition, a wiring 57 from the output section 311 on the 100 V side of the main earth leakage breaker 31 is introduced into the commercial power failure changeover switch 20 through the commercial power input terminal 27.

The commercial power failure changeover switch 20 is a switch that detects a power failure of the commercial AC power supply 4 and automatically switches between the commercial AC power supply 4 (wiring 57 side) and the solar power self-sustaining operation side (wiring 53 side). Yes, power for automatic switching of the commercial power failure changeover switch 20 is supplied from a storage battery 23 described later.
The wiring 58 from the commercial power failure changeover switch 20 is connected to the storage battery 23. The storage battery 23 employs a lithium polymer battery in the present embodiment, but other known types of storage battery can also be employed. The power that can be supplied by the storage battery 23 is not particularly limited, but is set to 3 kW, for example. Moreover, the discharge capacity of the storage battery 23 is also set as appropriate.

In the path of the wiring 58, a timer switch 21 and a power storage converter 22 are provided in order from the side closer to the commercial power failure changeover switch 20.
The timer switch 21 is a timer switch for storing power in the storage battery 23. In the present embodiment, the timer switch 21 is in an ON state from 23:00 to 7:00, and is in an OFF state from 7:00 to 23:00. Is set. However, when the power supply by the independent operation is started due to a power failure of the commercial AC power supply 4 during the photovoltaic power generation, the power supply is always turned on. Note that power for automatic switching of the timer switch 21 is supplied from the storage battery 23.

  The power storage converter 22 is a converter that converts an alternating current supplied from the commercial AC power supply 4 into a direct current of a specified voltage for power storage. It is a unidirectional converter that performs programmed power storage.

  In this embodiment, the storage battery 23 has a volume energy density of 380 Wh / L or less and a safety standard of 400 Wh / L or less, but is not limited to this if it is within the safety standard. Absent. The storage battery 23 is safe because the lithium electrolyte is a jelly-like polymer, and has fewer volatile organic components. For example, the package case is simpler than a lithium ion battery and can be molded freely. Note that the lithium polymer battery is not subject to the regulations of JIS C 8714/8712.

  One end of the wiring 59 is connected between the storage converter 22 and the storage battery 23 in the path of the wiring 58. The other end of the wiring 59 is introduced into the output power supply switch 25. A discharge inverter 24 is provided in the path of the wiring 59. The discharge inverter 24 is a unidirectional inverter that performs conversion from a direct current, which is output from the storage battery 23 and has a strictly programmed discharge voltage characteristic and discharge time, to an alternating current.

  In addition to the wiring 59, the output power supply switching switch 25 includes the other end of the wiring 60 which is a bypass having one end connected between the commercial power failure switching switch 20 and the timer switch 21 in the path of the wiring 58. Department has been introduced. The output power supply switch 25 automatically switches between the storage battery 23 side (wiring 59 side) supplied through the discharging inverter 24 and the commercial AC power supply 4 (wiring 60 side) supplied through the main leakage breaker 31. Switch.

  More specifically, the output power switch 25 is switched to the wiring 59 when the timer switch 21 is in an OFF state (from 7:00 to 23:00) and is output from the storage battery 23, and the other side is a commercial AC power supply. 4 (wiring 60 side). Further, the output power switch 25 is connected to the commercial AC power supply (wiring 60 side) when the timer switch 21 is turned on (from 23:00 to 7:00).

In addition, the output power changeover switch 25 is connected to the storage battery 23 side when the photovoltaic power generation apparatus 1 is in a self-sustaining operation state when the commercial AC power supply 4 is in a power failure state, and further, the power generation by the photovoltaic power generation apparatus 1 is stopped at night. Switch to (wiring 59 side).
Furthermore, in normal operation other than a power failure, when the output load is applied, for example, 3 kW or more while power is being supplied from the storage battery 23 side power source, the commercial AC power source 4 (wiring 60 side) is switched. The setting of the output load is not limited to 3 kW, and can be set as appropriate.

  The output power changeover switch 25 has a momentary power failure (the standard value of 1/400 seconds or less is uninterrupted) at the switch operation time lag, and even if there is no power failure below the reference value, it may affect home appliances. It also has a preventive action. The power for automatic switching of the output power switch 25 is supplied from the storage battery 23.

  The main earth leakage circuit breaker 31 is provided in the switchboard 3 on the user side (load side). The main earth leakage circuit breaker 31 supplies the electric power from the commercial side AC power supply 4 and the photovoltaic power generator 1 to the load side by a single-phase three-wire system. A 200 V alternating current is supplied from one output section 310 of the main earth leakage circuit breaker 31. The other end of the wiring 62 whose one end is connected to the output unit 310 is connected to the 200V branch breaker 32. It is to be noted that a breaker (not shown) for electrical equipment is connected to the downstream side of the 200V branch breaker 32.

Further, an AC current of 100 V is supplied from the other output unit 311 of the main earth leakage circuit breaker 31. The other end of the wiring 57 having one end connected to the output unit 311 is introduced into the commercial power failure changeover switch 20 as described above.
The wiring 61 from the output power supply switch 25 is connected to the 100 V branch breaker 33 in the switchboard 3 through the output terminal 28. It is to be noted that a breaker for electrical equipment (reference numeral omitted) is connected to the downstream side of the 100 V branch breaker 33.

Note that the wiring 51 that links the photovoltaic power generator 1 and the commercial AC power supply 4 is a wiring necessary for a surplus power contract (power sale contract) with an electric power company, and the photovoltaic power generator 1 is already installed. When only the cage power supply control device 2 is introduced, it is used as it is and is not modified.
Moreover, when the solar power generation device 1 performs a self-sustaining operation at the time of a power failure of the commercial-side AC power supply 4, the wiring 54 that supplies an AC current of 100V is used as it is and is not modified.

(Function)
With reference to FIG. 1 thru | or FIG. 9, the effect | action of the residential electric power feeding system S is demonstrated for every case.
Note that in FIGS. 3 to 9, charging portions (portions through which current flows) of each wiring during operation are represented by thick black lines.
In addition, the control for switching ON / OFF with the timer switch 21 needs to be matched to the time zone classification of each electric power company that provides services in the area where the residential power supply system S is installed. Are not necessarily the same in each power company, and may be different.

  In this embodiment, the service time zone is “7: 00-10: 00 (morning), 10: 00-17: 00 (daytime), 17: 00-23: 00 (evening), 23: 00-7 An example of installation in an area of a power company that is classified as ": 00 (nighttime)" will be described.

A. Control in the morning and evening hours, 7: 00-10: 00, 17: 00-23: 00 (1)
Please refer to FIG.
In this time zone, when the solar power generation device 1 is not generating power, electric power is supplied from the commercial-side AC power supply 4, and this electric power is supplied as it is to the load side. No power is sold to the commercial AC power supply 4 side. Hereinafter, the control of this case will be described in detail.

  First, the state of the switches is that the timer switch 21 of the power supply control device 2 is in the OFF state, the commercial power failure changeover switch 20 is switched to the wiring 57 side, and the output power supply switch 25 is switched to the wiring 60 side. . Power storage by the power supply control device 2 is in a stopped state.

  The AC current supplied from the commercial-side AC power source 4 through the wiring 56 and the purchased electricity meter 40 passes through the wiring 55, the surplus power energy meter 30, and the contract power controller 41 in the route of the wiring 52, and then is supplied to the distribution board. 3 is introduced into the main earth leakage circuit breaker 31. Then, an AC current of 200 V is supplied from the output unit 310 of the main circuit breaker 31 through the 200 V branch breaker 32 to the load side device.

  Further, the 100V AC current supplied from the output unit 311 of the main earth leakage circuit breaker 31 passes through the wiring 57 and is introduced into the commercial power failure changeover switch 20 of the power supply control device 2, and further passes through the wiring 58 and the wiring 60. Introduced into the output power source switch 25. Then, the 100V AC current is supplied to the load side device through the wiring 61 and the 100V branch breaker 33.

B. Control in the morning and evening hours, 7: 00-10: 00, 17: 00-23: 00 (2)
Please refer to FIG.
In this time zone, when the solar power generation device 1 is generating power, the power generated by the solar power generation device 1 is sold to the commercial AC power supply 4 on the one hand and supplied to the load side on the other hand ( (Secondary power operation mode) Hereinafter, the control of this case will be described in detail.

  First, the state of the switches is that the timer switch 21 of the power supply control device 2 is in the OFF state, the commercial power failure changeover switch 20 is switched to the wiring 57 side, and the output power supply switch 25 is switched to the wiring 60 side. . Further, the supply of power from the commercial AC power supply 4 is stopped, and the power storage by the power supply control device 2 is in a stopped state.

The direct current generated by the solar cell module 10 of the solar power generation device 1 is introduced into the power conditioner 12, the direct current is converted into an alternating current, and an alternating current of 103 V is output from the output unit 121.
The AC current of 103V passes through the photovoltaic power generation leakage breaker 13 on the wiring 51 path, and further on the one side (commercial AC power supply 4 side) on the wiring 52 path, the contract power controller 41 and the surplus power watt-hour meter. 30. Passing through the watt-hour meter 40 for power purchase, the power is reversely flowed to sell power.

  The AC current of 103 V is introduced into the main leakage breaker 31 in the switchboard 3 on the other side (the switchboard 3 side) on the wiring 52 path. Then, an AC current of 200 V is supplied from the output unit 310 of the main circuit breaker 31 through the 200 V branch breaker 32 to the load side device. In addition, the 100V AC current supplied from the output unit 311 is introduced into the commercial power failure changeover switch 20 of the power supply control device 2 through the wiring 57 and further through the wiring 58 and the wiring 60 to the output power supply switching switch 25. It is introduced, passes through the wiring 61, passes through the 100V branch breaker 33, and is supplied to the load side equipment.

C. Control during daytime, 10: 00-17: 00 (1)
Please refer to FIG.
In this time zone, when the power consumption on the load side is smaller than the power that can be discharged from the storage battery 23 (for example, 3 kW), power is supplied from the storage battery 23 to the 100 V output side on the load side, and the photovoltaic power generator 1 The generated electric power is sold on the one hand to the commercial AC power supply 4 side (power selling operation mode), and on the other hand, is supplied to the 200 V output side on the load side. Hereinafter, the control of this case will be described in detail.

  First, the state of the switches is that the timer switch 21 of the power supply control device 2 is in an OFF state, the commercial power failure changeover switch 20 is switched to the wiring 57 side, and the output power supply switch 25 is switched to the wiring 59 side. . Further, the supply of power from the commercial AC power supply 4 is stopped, and the power storage by the power supply control device 2 is in a stopped state.

The direct current generated by the solar cell module 10 of the solar power generation device 1 is introduced into the power conditioner 12, the direct current is converted into an alternating current, and an alternating current of 103 V is output from the output unit 121.
The AC current of 103V passes through the photovoltaic power generation leakage breaker 13 on the wiring 51 path, and further on the one side (commercial AC power supply 4 side) on the wiring 52 path, the contract power controller 41 and the surplus power watt-hour meter. 30. Passing through the watt-hour meter 40 for power purchase, the power is reversely flowed to sell power.

  The AC current of 103 V is introduced into the main leakage breaker 31 in the switchboard 3 on the other side (the switchboard 3 side) on the wiring 52 path. Then, an AC current of 200 V is supplied from the output unit 310 of the main circuit breaker 31 through the 200 V branch breaker 32 to the load side device. Note that the supply of 100V AC current from the output unit 311 is not performed.

  A direct current is supplied from the storage battery 23 of the power supply control device 2, is introduced into the discharging inverter 24 through the wiring 58 and the wiring 59, and is converted into an alternating current of 100V. Then, it is introduced into the output power supply changeover switch 25 through the wiring 59, supplied through the wiring 61 to the equipment on the load side through the 100 V branch breaker 33.

D. Daytime time, control from 10:00 to 17:00 (2)
Please refer to FIG.
In this time zone, when the power consumption on the load side is larger than the power that can be discharged from the storage battery 23 (for example, 3 kW), the discharge from the storage battery 23 is stopped, and the power generated by the solar power generation device 1 is Electric power is sold to the commercial AC power supply 4 side (power selling operation mode), and supplied to the load side (complementary operation mode). Hereinafter, the control of this case will be described in detail.

  First, the state of the switches is that the timer switch 21 of the power supply control device 2 is in the OFF state, the commercial power failure changeover switch 20 is switched to the wiring 57 side, and the output power supply switch 25 is switched to the wiring 60 side. . Further, the supply of power from the commercial AC power supply 4 is stopped, and the power storage by the power supply control device 2 is in a stopped state.

The direct current generated by the solar cell module 10 of the solar power generation device 1 is introduced into the power conditioner 12, the direct current is converted into an alternating current, and an alternating current of 103 V is output from the output unit 121.
The 103V AC current passes through the photovoltaic power leakage breaker 13 on the wiring 51 path, and on one side (commercial AC power supply 4 side) on the wiring 52 path, the contract power controller 41 and the surplus power watt-hour meter 30. Then, the electric power is passed through the watt-hour meter 40 for power purchase, and the power is sold in the reverse power flow.

  Further, the AC current of 103 V is introduced into the main leakage breaker 31 in the switchboard 3 on the other side (the switchboard 3 side) on the wiring 52 path. Then, an AC current of 200 V is supplied from the output unit 310 of the main circuit breaker 31 through the 200 V branch breaker 32 to the load side device. In addition, the 100V AC current supplied from the output unit 311 is introduced into the commercial power failure changeover switch 20 of the power supply control device 2 through the wiring 57 and further through the wiring 58 and the wiring 60 to the output power supply switching switch 25. It is introduced, passes through the wiring 61, passes through the 100V branch breaker 33, and is supplied to the load side equipment.

E. Control at night time, 23: 00-7: 00 Refer to FIG.
In this time zone, cheap nighttime electric power is supplied from the commercial-side AC power supply 4, and this electric power is supplied to the load side on the one hand and stored in the storage battery 23 on the other hand (power storage operation mode). No power is sold to the commercial AC power supply 4 side. Hereinafter, the control of this case will be described in detail.

  First, the state of the switches is that the timer switch 21 of the power supply control device 2 is in the ON state, the commercial power failure changeover switch 20 is switched to the wiring 57 side, and the output power supply switch 25 is switched to the wiring 60 side. .

  The AC current supplied from the commercial-side AC power source 4 through the wiring 56 and the purchased electricity meter 40 passes through the wiring 55, the surplus power energy meter 30, and the contract power controller 41 in the route of the wiring 52, and then is supplied to the distribution board. 3 is introduced into the main earth leakage circuit breaker 31. Then, an AC current of 200 V is supplied from the output unit 310 of the main circuit breaker 31 through the 200 V branch breaker 32 to the load side device.

  In addition, the 100V AC current supplied from the output unit 311 of the main earth leakage circuit breaker 31 passes through the wiring 57 and is introduced into the commercial power failure changeover switch 20 of the power supply control device 2. It is introduced into the power storage converter 22 via the timer switch 21 on the 58th path. The alternating current of 100 V is converted into the direct current of the specified voltage for power storage by the power storage converter 22 and stored in the storage battery 23.

  Thus, in this system S, since the lithium polymer battery is adopted as the storage battery 23, it is necessary to strictly control the power charge characteristic and the storage time for safety when storing the power. The direct current generated at 1 is not directly stored in the storage battery 23, but is stored after the alternating current is converted into direct current and the above control is performed.

  The AC current of 100V introduced into the changeover switch 20 at the time of commercial power failure is introduced into the output power supply changeover switch 25 through the wiring 58 and wiring 60 on the other side, through the wiring 61 and through the 100V branch breaker 33. Supplied to load side equipment.

F. Control at the time of power failure of commercial AC power supply (1)
Please refer to FIG.
When the power failure of the commercial AC power source 4 is nighttime and the solar power generation device 1 is not generating power, power is supplied from the storage battery 23 to the 100V output side on the load side (operation mode during power failure). Hereinafter, the control of this case will be described in detail.

  First, the state of the switches is that the timer switch 21 of the power supply control device 2 is in the OFF state, and the output power supply switch 25 is switched to the wiring 59 side. Power storage by the power supply control device 2 is in a stopped state. The commercial AC power supply 4 has a power failure, and no power is supplied from the commercial AC power supply 4.

  In this case, a direct current is supplied from the storage battery 23 of the power supply control device 2, is introduced into the discharge inverter 24 through the wiring 58, and is converted into an alternating current of 100V. Then, it is introduced into the output power supply changeover switch 25 through the wiring 59, supplied through the wiring 61 to the equipment on the load side through the 100 V branch breaker 33.

G. Control at the time of power failure of commercial AC power supply (2)
Please refer to FIG.
When the commercial power supply 4 has a power failure during the daytime and the solar power generation device 1 is generating power, the power generated by the solar power generation device 1 is supplied to the 100V output side on the load side and the storage battery on the other hand. 23 is stored (operation mode during power failure). Hereinafter, the control of this case will be described in detail.

  First, the state of the switches is such that the commercial power failure changeover switch 20 of the power supply control device 2 is switched to the wiring 53 side, the timer switch 21 is in the ON state, and the output power supply switch 25 is switched to the wiring 60 side. .

  The direct current generated by the solar cell module 10 of the solar power generation device 1 is introduced into the power conditioner 12, the direct current is converted into an alternating current by a self-sustained operation, and an alternating current of 100 V is output from the output unit 122. The AC current of 100 V supplied from the output unit 122 passes through the wiring 53 and is supplied to the outlet for exclusive use in autonomous operation 14 through the wiring 54.

  In addition, the 100V AC current is introduced into the commercial power failure changeover switch 20 of the power supply control device 2 through the wiring 53, passes through the wiring 58 on one side, and passes through the timer switch 21 on the wiring 58 path to the power storage converter 22. be introduced. The alternating current of 100 V is converted into the direct current of the specified voltage for power storage by the power storage converter 22 and stored in the storage battery 23.

  In addition, the 100V AC current introduced into the commercial power failure changeover switch 20 is introduced into the output power supply changeover switch 25 through the wiring 58 and the wiring 60 on the other side, through the wiring 61, and through the 100V branch breaker 33. Is supplied to the load side equipment.

In this case, since no alternating current is introduced into the main leakage breaker 31 in the switchboard 3, no 200 V alternating current is output from the output unit 310.
In addition, when the commercial side AC power supply 4 has a power failure, if the power generated by the photovoltaic power generation apparatus 1 is reversely flowed to the commercial side AC power supply 4, the transformer is damaged, so that power cannot be sold.

  As described above, the residential power supply system S according to the present embodiment uses commercial power from a storage battery that stores power from the commercial-side AC power supply 4 during the night power supply time period, as in the conventional distributed power supply system. Instead of making the reverse power flow to the side AC power supply 4, the power generated by the solar power generator 1 is made to reverse flow to the commercial AC power supply 4.

  Accordingly, the residential power supply system S uses a natural energy power generation device such as a solar power generation device, a storage battery, and a commercial-side AC power supply 4 to supply power from the commercial-side AC power supply 4 in the midnight power supply time zone to the storage battery 23. Can be used on the load side in the daytime, and the power can be sold in reverse flow to the commercial AC power supply 4 in accordance with a power sale contract with a domestic power company. Electricity can be done.

  The terms and expressions used in this specification are merely explanatory and are not limiting at all, and exclude terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to do. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

DESCRIPTION OF SYMBOLS S Residential electric power feeding system 1 Photovoltaic power generation device 10 Solar cell module 11 Connection unit 12 Power conditioner 120 Input part 121 Output part 122 Output part 13 Solar power leakage breaker 14 Stand-alone outlet 2 Power supply control device 20 Switching at the time of commercial power failure Switch 21 Timer switch 22 Storage converter 23 Storage battery 24 Discharge inverter 25 Output power source switch 26 Solar power generation self-sustained operation power input terminal 27 Commercial power input terminal 28 Output terminal 3 Switchboard 30 Power meter for surplus power 300 Input unit 301 Output Unit 31 Main earth leakage circuit breaker 310 Output unit 311 Output unit 32 200V branch circuit breaker 33 100V branch circuit breaker 4 Commercial AC power supply 40 Power meter for power purchase 400 Input unit 401 Output unit 41 Contract power controller 50 to 62 Wiring

Claims (4)

Residential power supply that has a natural energy generator (1), a commercial AC power supply (4), and a power supply control device (2) equipped with a storage battery (23) and supplies power to the load side (3) A system,
Supply the AC power from the commercial AC power source (4) to the load side (3) and convert the AC current to DC current during the time when the electricity charge of the commercial AC power source (4) is the cheapest. Power storage operation mode for storing in (23);
During the time when the electricity charge of the commercial AC power supply (4) is expensive, the direct current discharged from the storage battery (23) is converted into an alternating current and supplied to the load side (3). A power selling operation mode in which AC power from 1) is reversely flowed to the commercial AC power source (4) to sell power,
Including
In the power selling operation mode, when discharging from the storage battery (23), if the power supplied by the discharge is insufficient on the load side (3), the natural energy generator (1) and the commercial AC power supply ( 4) Complementary operation mode for supplying AC power from the load side to the load side (3)
Furthermore, when the commercial AC power supply (4) is blackout,
When the natural energy generator (1) is not generating power, the direct current discharged from the storage battery (23) is converted into an alternating current and supplied to the load side (3), and the natural energy generator (1) When power is generated, the AC power from the natural energy generator (1) is supplied to the load side (3), and the alternating current is converted to DC current and stored in the storage battery (23). Mode,
Including
Each mode is switched by the power supply control device (2) according to a preset time schedule, or can be switched at the time of a power failure or no power failure.
Residential power supply system. When the natural energy power generator (1) is not generating power during a time when the electricity charge of the commercial AC power supply (4) is low, supply AC power from the commercial AC power supply (4) to the load side, When the natural energy generator (1) is generating power, supply AC power from the natural energy generator (1) to the load side (3) and reverse power flow to the commercial AC power source (4). It has a secondary power selling operation mode to sell power
The residential power supply system according to claim 1. The power supply control device (2)
Commercial power supply that switches between the AC power output side (121) of the commercial AC power source (4) or the natural energy generator (1) and the AC current output side (122) during the self-sustaining operation of the natural energy generator (1) With a power failure changeover switch (20),
In accordance with a preset time schedule, a timer switch (21) for switching ON / OFF of the electrical path (58) from the commercial power failure switch (20) to the storage converter (22),
A power storage converter (22) that converts alternating current into direct current;
A storage battery (23) for storing the electric power converted into direct current by the storage converter (22);
A discharge inverter (24) for converting a direct current discharged from the storage battery (23) into an alternating current;
Output power switching that switches between the electrical path (59) through which the alternating current supplied from the discharge inverter (24) passes and the electrical path (60) that directly connects the alternating current through the changeover switch (20) during commercial power failure to the load side Switch (25),
With
The residential power supply system according to claim 1 or 2. A power supply control device constituting a residential power supply system having a natural energy power generation device, a commercial AC power supply, and a power supply control device including a storage battery,
Commercial power supply that switches between the AC power output side (121) of the commercial AC power source (4) or the natural energy generator (1) and the AC current output side (122) during the self-sustaining operation of the natural energy generator (1) With a power failure changeover switch (20),
In accordance with a preset time schedule, a timer switch (21) for switching ON / OFF of the electrical path (58) from the commercial power failure switch (20) to the storage converter (22),
A power storage converter (22) that converts alternating current into direct current;
A storage battery (23) for storing the electric power converted into direct current by the storage converter (22);
A discharge inverter (24) for converting a direct current discharged from the storage battery (23) into an alternating current;
Output power switching that switches between the electrical path (59) through which the alternating current supplied from the discharge inverter (24) passes and the electrical path (60) that directly connects the alternating current through the changeover switch (20) during commercial power failure to the load side Switch (25),
With
Power supply control device.

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