JP2013070585A - Power supply apparatus and power supply system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of supplying electric power with high quality to a load side and delivering electric power with the same high quality in an inverse load flow to a commercial power supply side as well, while a photovoltaic power generation apparatus or a wind power generation apparatus is generating electric power.SOLUTION: The present invention comprises: a photovoltaic power generation apparatus (1); a DC-DC converter (20) that converts DC power supplied from the photovoltaic power generation apparatus (1) to DC power in which a voltage has been adjusted within a fixed range according to characteristics of a storage battery to be charged; storage batteries (21, 22) that charge DC power output from the DC-DC converter (20); and a DC-AC inverter (23) that converts DC power discharged from the storage batteries (21, 22) to AC power. The storage batteries (21, 22) have a plurality of circuits and link a power supply apparatus (D) that concurrently performs charging and discharging using the storage battery with different circuits to a commercial power (4) side and a load (3) side.

Description

The present invention relates to a power supply apparatus and a power supply system using the same.
More specifically, unstable DC power generated by a solar power generation device or a wind power generation device (hereinafter, only the solar power generation device may be described) is converted into stable DC power, and the stable DC power A power supply device linked to the commercial power supply side and the load side, and a power supply system using the same, which is generated by the solar power generation device or the wind power generation device In some cases, power of sufficient quality is supplied to the load side, and power of sufficient quality can also be transmitted in the case of reverse power flow to the commercial power source side.

  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 have taken measures such as setting nighttime electricity prices at low prices to promote their use, stopping some of the power generation facilities, and reducing output. Yes.

  However, the latter measure results in a low efficiency operation of the generator, resulting in a significant energy loss. 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 this situation, renewable energy system power such as photovoltaic power generation devices with large fluctuation factors were linked to stable power such as midnight power, and surplus power was used effectively to save energy. As a power feeding system, for example, there is a “housing power feeding system” disclosed in Patent Document 1 proposed by the present inventor.

  This residential power supply system supplies power from the commercial power source to the load side at a time when the charge is low and charges the storage battery, and supplies charge power to the load side at a time when the charge is normal. A mode in which power from the power generator or wind power generator is sold, a mode in which power is supplied from the power generator and commercial power source to the load side when power from the storage battery is insufficient on the load side, and a power generator generates power during a power outage If not, the charging power is supplied to the load side, and when generating electricity, the power supply is also supplied to the load side and the storage battery is charged.Each mode can be switched according to the time schedule by the power supply control device or at the time of power failure / It has a configuration that can be switched during an uninterruptible power failure.

JP2011-50131A

However, the conventional residential power supply system has the following problems.
That is, when a renewable energy power generation device such as a solar power generation device is operating and generating power, the generated power is converted from direct current power to alternating current power by a power conditioner equipped with a DC / AC inverter in the supply path. By doing so, it is directly linked to the commercial power side and supplied to the load side. Further, when the remaining power that is not consumed on the load side of the generated power is caused to flow backward to the commercial power source side, the power is also supplied in the same manner.

The electric power supplied in this way is such that the direct current power generated by the photovoltaic power generation device is not easily constant in voltage, and the current is similarly unstable. There is a problem that it is difficult to stabilize and sufficient quality cannot be obtained as electric power to be used on the load side or electric power to be reversely flowed to the commercial power source side.
For this reason, various electric equipment on the load side may be damaged by the unstable power supplied to the load side of other users or the reverse power flow to the load side or commercial power supply side of the system installation consumer, or the power company The electric equipment on the power pole on the side may require measures such as increasing the capacity, and various electric equipment on the other consumer side may be damaged.

  Further, the conventional residential power supply system has a structure in which the power conditioner is used as described above in the path for supplying the generated power. In this structure, for example, in the daytime, when the commercial power supply side fails during power generation by the solar power generator, the solar power generator is forcibly stopped.

  In other words, when the operation of the solar power generation device is continued in the above situation, for example, when it becomes rainy or cloudy, when the power generation output decreases and insufficient power supply to the load side occurs, the various types used on the load side There is a possibility that various inconveniences may occur due to the use of electrical equipment by the consumer side recognizing that power is supplied, such as failure of electrical equipment or data corruption on personal computers etc. there were.

For this reason, in the above situation, the power conditioner stops the supply of the power generated by the solar power generation device to prevent the above inconveniences. As a result, the generated power is not supplied to the load side. The supply could not be made.
Therefore, the conventional residential power supply system is equipped with a solar power generation device that has a sufficient amount of power generation with respect to the power demand in ordinary households during sunshine (especially in clear daytime). This could not be used effectively, and the load side was eventually in a power outage state.

(Object of the present invention)
The present invention is a commercial power supply that converts unstable DC power generated in a solar power generation device or wind power generation device into stable DC power, converts the stable DC power into AC power, and supplies the AC power to a load side. Power supply apparatus linked to the load side and the load side, and a power supply system using the same, supplying sufficient quality power to the load side when the solar power generator or wind power generator is generating power It is another object of the present invention to provide a power supply apparatus and a power supply system using the same, which can send power of sufficient quality even when a reverse power flow is made to the commercial power source.

  Another object of the present invention is to meet the demand for electric power in general households, especially in the daytime on a fine day, even if the commercial power supply side fails when the solar power generator is generating power during sunshine. A power supply device having a power storage function that enables normal operation without stopping operation of a photovoltaic power generator with sufficient margin for power generation, and prevents a power outage or power shortage on the load side, and the power supply device It is to provide a power supply system using the.

  Means taken by the present invention to solve the above problems are as follows.

(1) The present invention
Linked with the commercial power supply side and the load side, converts the unstable DC power generated by the solar power generator or wind power generator into stable DC power, converts the stable DC power into AC power, A power supply device for supplying,
A solar power generator or a wind power generator;
A DC / DC converter that converts direct-current power supplied from the solar power generation device or wind power generation device into direct-current power adjusted to a specified voltage in accordance with the characteristics of the storage battery to be charged;
A storage battery for charging DC power output from the DC / DC converter;
A DC / AC inverter that converts the DC power discharged from the storage battery into AC power;
The AC power converted by the DC / AC inverter is supplied to the load side.
It is a power supply device.

(2) The present invention
The power supply device has a control means, and when the commercial power supply side fails when the solar power generation device or the wind power generation device is generating power, the control means causes the solar power generation device or the wind power generation to be generated. Includes control to charge the power from the device to one of the multiple storage batteries, simultaneously discharge from the other storage battery and supply to the load side, avoiding power outages or power shortages on the load side ,
The power supply device according to (1).

(3) The present invention
In the control of charging the power from the solar power generation device or the wind power generation device to one storage battery among the storage batteries composed of a plurality of systems, and simultaneously discharging from the storage battery of another system, the control means,
Before the discharging storage battery reaches the discharge limit, the discharging storage battery is switched to the charging side, and the storage battery of another system different from the discharging storage battery is switched to the discharging side. Including control,
The power supply device of (2).

(4) The present invention
The power supply apparatus includes a control unit, and the control unit includes:
(A. Normal time, midnight)
When the solar power generation device or the wind power generation device is not generating power, the AC power input from the commercial power supply side is supplied to the load side, and the AC power is converted into DC power and the storage battery is charged. A first operation mode;
(B. Normal time, morning and afternoon)
When the solar power generator or wind power generator is generating power, the storage battery is charged with DC power input from the solar power generator or wind power generator, and the DC power is discharged from the storage battery and converted to AC power. When the discharge power is greater than the demand power on the load side, the surplus is reversed to the commercial power supply side, and when the discharge power is less than the demand power on the load side, the insufficient power is supplied to the load side. A second operation mode in which the supply is supplemented from the commercial power supply side and supplied to the load side;
(C. Normal time, night)
When the solar power generation device or the wind power generation device is not generating power, the DC power discharged from the storage battery is converted to AC power and supplied to the load side, and when the discharge power is less than the load side demand power, A third operation mode in which the shortage of electric power is supplemented from the commercial power source side and supplied to the load side;
(D.F. at the time of a power failure, midnight, night)
A fourth operation mode for performing control to convert the DC power discharged from the storage battery into AC power and supply it to the load side when the commercial power supply side fails and the solar power generator or the wind power generator is not generating power; ,
(E. Power outage, morning and noon)
When the commercial power supply side has a power failure and the solar power generator or wind power generator is generating power, the DC power discharged from the storage battery is converted to AC power and supplied to the load side. A fifth operation mode for performing control for charging the storage battery with DC power input from the device;
Including control to do
The power supply device according to (1).

(5) The present invention
Between the commercial power supply side and the load side, the power supply device according to any one of the above (1) to (4) is arranged in cooperation with each other.
It is a power supply system.

  The solar power generation apparatus or the wind power generation apparatus can be combined with or replaced with other renewable energy power generation apparatuses.

  The term “reverse power flow” as used in the claims and specification refers to a system linkage that connects power generated by a renewable energy system power generator such as solar power generation or wind power generation with power received from an electric power company. When operating the electrical system of the facility in a linked state, when the generated power increases, the surplus power is sent to the power company line (commercial power supply).

  Each electric power company in Japan can make a contract with a charge system tailored to the application. For example, (1) 23:00 to 7:00 (midnight), (2) 7:00 to 10:00 (morning), and 18:00 to 23:00 ( Evening time zone), (3) 10: 00-18: 00 (daytime zone), and the present invention has a function that enables the control setting to match the control time by such a contract system time zone. It is what you have.

  The time zone from 23:00 to 7:00 (midnight), which is the charge system, corresponds to “the time zone when electricity charges are cheap” in the description of this specification, and from 7:00 to 10:00 (morning) and 18: The time zone from 00 to 23:00 (evening) is also equivalent to the “hours when the electricity charges are slightly cheaper”, and the time zone from 10:00 to 18:00 (noon) is also Hit the obi.

  As an example of the difference in electricity charges in each of the above time zones, if the charge in the time zone from 10:00 to 18:00 (daytime) (the time zone where the electricity rate is normal) is 100, 7:00 to 10:00 (morning) and 18: 00-23: 00 (night) time zone (hours when electricity charges are slightly cheap) 69.3, late night hours (hours when electricity rates are cheap) The price is 27.5.

  Moreover, the storage battery comprised by multiple systems may be comprised by 2 systems, for example, or can also be comprised by 3 systems or more.

  In addition, since the term “DC / AC inverter” used in the claims and the specification originally means “an inverter” means “a device that converts a direct current into an alternating current”, the term “DC / AC inverter” The term “AC” is not required, but is used for clarity.

(Function)
The operation of the power supply device and the power supply system according to the present invention will be described.
The power supply device and the power supply system have a voltage within a certain range in accordance with the characteristics of the storage battery that charges the generated DC power by the DC / DC converter when the solar power generation device or the wind power generation device is generating power. After adjustment, the storage battery is charged. The DC power generated by the solar power generator or the wind power generator is not constant in voltage, but becomes stable by adjusting the voltage and charging the storage battery as described above.

  And the direct-current power discharged from the storage battery is converted into alternating current power by a DC / AC inverter. The AC power obtained in this way becomes a high-quality AC power with a stable current waveform because the converted discharge DC power is stable. Therefore, it becomes possible to supply power with sufficient quality to the load side, and it is also possible to send power with sufficient quality when the power is reversely flowed to the commercial power source side. As a result, various types of electrical equipment on the load side may fail, or measures such as increasing the capacity of electrical equipment on the power pole side on the power company side may be required, or various electrical equipment on the other consumer side may also be damaged. Can be prevented.

In addition, all the DC power generated by the solar power generation device or the wind power generation device is sent to the storage battery for charging, and all the generated DC power used in the conventional system is AC power. It is not necessary to use a power conditioner that converts the power to the load side or the commercial power source side. Therefore, there is no power loss in the power conditioner when converting direct current power into alternating current power, and waste can be reduced.
Furthermore, since there is no power conditioner, the reliability of the entire apparatus is improved by the number of parts used.

  In addition, since the conventional one uses a power conditioner, it is necessary to use the same manufacturer and the same standard when, for example, adding or partially replacing the power generation panel after installing the system. Because other manufacturers' products cannot be mixed, there are large restrictions on the selection and it was difficult to select.

  However, in the power supply system according to the present invention, the DC power generated by the solar power generation device or the wind power generation device is sent to the storage battery and charged without using a power conditioner. Even if the power generation panel is expanded or partly replaced, it can be operated without any problems. Therefore, there is an advantage that the degree of freedom of selection at the time of expansion or replacement of the power generation panel is high particularly for the installer (customer).

When the commercial power source side has a power failure when the solar power generation device or the wind power generation device is generating power, the control means supplies a plurality of electric power from the solar power generation device or the wind power generation device. One of the storage batteries configured in the system is charged with one storage battery, simultaneously discharged from the storage battery of the other system and supplied to the load side, and includes control to avoid power outages or power shortages on the load side. Normal operation can be performed without stopping the operation of the apparatus or the wind power generator.
In other words, even if a power failure occurs when power is generated by a solar power generation device or a wind power generation device, charging of the generated power to the storage battery and power supply to the load side by discharging of the stored power can be performed simultaneously in parallel. Because it can supply enough power to the load side, it is difficult to cause power shortage on the load side even when it rains or is cloudy, and it is necessary to stop the photovoltaic power generator or wind power generator as in the past There is no.
Therefore, even in the above situation, it is possible to continue the operation of the solar power generation apparatus or the wind power generation apparatus with a sufficient margin in the amount of power generation with respect to the power demand in ordinary households, especially in the daytime in fine weather, and normal operation is possible. become. Thereby, it is possible to prevent a power outage or power shortage from occurring on the load side even during a power outage on the commercial power source side during sunshine.

In the control to charge the power from the solar power generator or the wind power generator to one storage battery among the multiple storage batteries and simultaneously discharge from the other storage batteries, the discharging storage battery has a discharge limit. Including the control that the storage battery on the discharging side is switched to the charging side and the storage battery of another system different from the discharging storage battery is switched to the discharging side before reaching If the storage battery is controlled so as not to be discharged to the discharge limit and switched to the charging side, the life of the storage battery becomes longer and can be used for a long time, so that it is excellent in maintainability.
In addition, since the storage battery of each system can be operated while being switched for charging or discharging, the overall capacity of the storage battery is increased as compared with the conventional system in which charging and discharging are repeatedly performed with one system of storage battery. Can do.

  The present invention is a commercial power supply that converts unstable DC power generated in a solar power generation device or wind power generation device into stable DC power, converts the stable DC power into AC power, and supplies the AC power to a load side. Power supply device linked to the load side and the load side, and a power supply system using the same, and when the solar power generation device or the wind power generation device is generating power, the generated power is once charged in the storage battery, Since it is designed to discharge, a power supply device capable of supplying sufficient quality power to the load side and also capable of sending sufficient quality power when using a reverse power flow to the commercial power supply side and the same are used. A power supply system can be provided.

In addition, when the commercial power supply side has a power failure when the solar power generation apparatus or the wind power generation apparatus is generating power, the control means supplies a plurality of power from the solar power generation apparatus or the wind power generation apparatus. Among the storage batteries that are configured by the above, those that include control to charge one storage battery, simultaneously discharge it from the other storage battery and supply it to the load side, avoiding power outages or power shortages on the load side, Even if a power failure occurs when power is generated by a power generation device or wind power generation device, charging of the generated power to the storage battery and power supply to the load side by discharging of the stored power can be performed simultaneously in parallel. Since sufficient power can be supplied to the load side, power shortage is unlikely to occur on the load side even when it is raining or cloudy, and there is no need to stop the photovoltaic power generation apparatus or the wind power generation apparatus as in the past.
Therefore, even in the above situation, it is possible to continue the operation of the solar power generation apparatus or the wind power generation apparatus with a sufficient margin in the amount of power generation with respect to the power demand in ordinary homes, especially in the daytime on sunny days, and it is possible to operate independently. become. Thereby, it is possible to prevent a power outage or power shortage from occurring on the load side even during a power outage on the commercial power source side during sunshine.

1 is a block diagram showing an embodiment of a power supply system according to the present invention. The block diagram of the electric power supply control part which comprises the electric power supply system shown in FIG. Explanatory drawing which shows the driving | operation control of A mode (time zone from 23:00 to 7:00) at normal time. Explanatory drawing which shows the driving | operation control of B mode (time zone of 7: 00-18: 00) at normal time. Explanatory drawing which shows the driving control of C mode (time zone from 18:00 to 23:00) at normal time. Explanatory drawing which shows the driving | operation control of D mode (23: 00-7: 00 time zone) at the time of a power failure. Explanatory drawing which shows the operation control of E mode (time zone of 7: 00-18: 00) at the time of a power failure. Explanatory drawing which shows the operation control of F mode at the time of a power failure (time zone from 18:00 to 23:00). The storage management of two storage battery modules is shown, (a) is a time zone graph, (b) is an explanatory diagram in the A mode, (c) is an explanatory diagram in the B mode, and (d) is an explanatory diagram in the C mode.

Embodiment
The present invention will be described in detail based on the embodiments shown in the drawings.
Please refer to FIG. 1 and FIG. The power supply control unit 2 shown in FIG. 1 is a simplified representation of the power supply control unit 2 of FIG. 2, and illustration of a cooling fan 26, a heat retaining heater 27, and open / close switches S11 and S12, which will be described later, is omitted. ing.

The power supply system S is a residential system, and includes a power supply device D, a commercial power source 4 and a load-side switchboard 3 linked to the power supply device.
The power supply device D includes a power supply control unit 2 including the solar power generation device 1, the first storage battery module 21, and the second storage battery module 22.
As for the power generation apparatus, a solar power generation apparatus is taken as an example in the present embodiment.

  The solar power generation device 1 adjusts the DC power generated by the solar cell modules 10, 10a, 10b, and 10c and the solar cell modules 10, 10a, 10b, and 10c to a voltage within a certain range. The solar power generation system connection part 11 is provided. In addition, about the photovoltaic power generation system connection part 11, since it is already marketed and the technical content is well-known, description is abbreviate | omitted.

  The solar cell modules 10, 10 a, 10 b, and 10 c convert sunlight (light energy) into electric power by the photovoltaic effect, and are panels that create a necessary electric power by connecting a large number of cells in series or in parallel. is there. In this embodiment, the solar power generation system connection unit 11 connects the four systems of solar cell modules 10, 10 a, 10 b, and 10 c to the power supply control unit 2.

Reference is mainly made to FIG.
The power supply control unit 2 includes a DC input unit 204 that inputs DC power from the photovoltaic power generator 1, an AC output unit 205 that outputs AC 100 V AC power to the load-side distribution board 3, and AC 200 V AC power to the load side. An AC output unit 206 for outputting and an AC input / output unit 207 for inputting a current of AC100V anode two lines from the commercial power supply 4 are provided.

  The power supply control unit 2 includes two systems of a first storage battery module 21 and a second storage battery module 22 connected in parallel. Each of the first storage battery module 21 and the second storage battery module 22 includes a large number of battery cells (reference numerals omitted). Examples of the battery cell to be used include a lithium polymer battery, and other types of storage batteries known in the art can be adopted as appropriate in accordance with the charging capacity required for the system.

  A wiring path W <b> 1 is provided between the first storage battery module 21 and the second storage battery module 22 and the DC input unit 204. In the route of the wiring route W1, a DC / DC converter 20, an open / close switch S1, a DC input / output balance sensor 200, and a changeover switch S2 are provided in this order from the DC input unit 204 side.

The DC / DC converter 20 is a designation suitable for charging in accordance with the characteristics of the first storage battery module 21 and the second storage battery module 22 that charge the direct-current power supplied from the solar power generation device 1 and input from the DC input unit 204. The voltage is adjusted.
Thus, all the DC power generated by the solar power generation device 1 is sent to the first storage battery modules 21 and 22 for charging, and the generated DC power used in the conventional system is used. A power conditioner that converts all power into AC power and sends it to the load side or commercial power supply side is not used.

  Further, the DC input / output balance sensor 200 is connected to the wiring path W2 to be described later, the direct-current power alternately input from one of the first storage battery module 21 and the second storage battery module 22, and the first storage battery module 21. And it is a sensor which detects the balance of the direct-current power output alternately from any one of the 2nd storage battery module 22. FIG.

  The changeover switch S2 is a switch that switches between the first storage battery module 21 and the second storage battery module 22 that charge the DC power supplied through the wiring path W1 under the control of the control unit 25 (the first storage battery when switching is not performed). The input to the module 21 and the second storage battery module 22 is cut off by the open / close switch S1). The first storage battery module 21 and the second storage battery module 22 are AC / DC converters that convert AC 100V power into DC power of a specified voltage for charging when charging power from the commercial power supply 4 as described later. A charger (not shown) provided with a (converter) is provided.

The power supply control unit 2 includes a DC / AC inverter 23 that converts DC power discharged alternately from the first storage battery module 21 and the second storage battery module 22 into AC power. A wiring path W <b> 2 is provided between the first storage battery module 21 and the second storage battery module 22 and the DC / AC inverter 23.
In the path of the wiring path W2, a changeover switch S3, the DC input / output balance sensor 200, and an open / close switch S4 are provided in this order from the first storage battery module 21 and the second storage battery module 22 side. The changeover switch S <b> 3 is a switch that switches a battery to be discharged when DC power is discharged from the first storage battery module 21 and the second storage battery module 22.

  A wiring path W <b> 3 is provided between the DC / AC inverter 23 and the AC output unit 205. An AC single-phase three-wire anode two-wire output balance sensor 201, an AC discharge output sensor 202, and an AC load-side output sensor 203 are provided in this order from the DC / AC inverter 23 side in the wiring route W3.

  The AC single-phase three-wire anode-two-wire output balance sensor 201 reads the output balance of the anode-two wires of the DC / AC inverter 23 under the control of the control unit 25, and equalizes (reads) this. The AC discharge output sensor 202 transmits information on the amount of solar power to the control unit 25, and the AC load side output sensor 203 detects the amount of power used on the load side, and the information is transmitted to the control unit 25. To send to.

  In the wiring path W3, a wiring path W4 is provided between the path between the AC load side output sensor 203 and the AC output unit 205 and the AC output unit 206. An open / close switch S9 is provided in the route of the wiring route W4.

  Further, a wiring path W <b> 5 is provided between the first storage battery module 21 and the second storage battery module 22 and the AC input / output unit 207. In the route of the wiring route W5, an opening / closing switch S5 and a changeover switch S6 are provided in order from the AC input / output unit 207 side.

  The changeover switch S6 is a switch that switches between the first storage battery module 21 and the second storage battery module 22 that charge power supplied from the commercial power supply 4 (see FIG. 1) through the wiring path W5. Note that the conversion from AC power to DC power when charging is performed by the chargers provided in each of the first storage battery module 21 and the second storage battery module 22 as described above.

  In the wiring path W5, a wiring path W6 is provided between the path between the AC input / output unit 207 and the open / close switch S5 and the path between the AC discharge output sensor 202 and the AC load side output sensor 203 in the wiring path W3. (See FIGS. 1 and 3). An open / close switch S7 is provided in the route of the wiring route W6.

  In the wiring path W5, between the AC input / output unit 207 and the open / close switch S5, a path closer to the AC input / output unit 207 than the wiring path W6, and in the wiring path W3, an AC load side output sensor further than the wiring path W6. Between paths closer to 203, a wiring path W7 is provided that branches from the wiring path W5. The wiring path W7 is a maintenance wiring path, and a maintenance opening / closing switch S8 for performing an opening / closing operation manually is provided in the wiring path W7.

  As shown in FIG. 2, the first storage battery module 21 and the second storage battery module 22 include a cooling fan 26 and a heat retaining heater 27 for performing temperature management of the first storage battery module 21 and the second storage battery module 22. Yes. The cooling fan 26 and the heat retaining heater 27 are connected to the first storage battery module 21 and the second storage battery module 22 through a wiring path W9. In the wiring path W9, an open / close switch S10 and an open / close switch S11 are provided in a path branched from each other and connected to the cooling fan 26 and a path connected to the heat retaining heater 27.

  The power supply control unit 2 includes a control unit 25 including an MPU (Micro-Processing Unit) and a DC power module 24 that supplies power to the control unit 25. The DC power module 24 is already on the market and its technical contents are known, so the description thereof is omitted.

  The control unit 25 has a storage unit (not shown) for installing control program software. For example, the control unit 25 controls the opening / closing or switching of the switches S1 to S11, exchanges information with the sensors 200, 201, 202, and 203, and the DC / DC converter 20 using program software installed in the storage unit. And the control of the DC / AC inverter 23 or the charge characteristics and discharge amount of the first storage battery module 21 and the second storage battery module 22 are performed.

  In addition, for example, by appropriately installing program software in accordance with the specifications and performance of the storage battery to be used in the storage unit of the control unit 25, it is possible to flexibly cope with changes or upgrades of the storage battery after system introduction.

  The DC power module 24 is connected to a path between the changeover switch S3 and the DC / AC inverter 23 in the wiring path W3 by a wiring path W8. During the operation of the system, for example, even if the commercial power supply 4 is interrupted, the control unit 25 is always supplied with direct-current power from the first storage battery module 21 and the second storage battery module 22. The system is controlled so as not to hinder the later control of the system.

  The commercial power supply 4 is connected to the AC input / output unit 207 by a wiring path W10. In the wiring path W10, the power contract amperes on the user side contracted with the electric power company are sequentially provided from the commercial power supply 4 side. A breaker 42 to be controlled, a power meter 40 for power purchase, and a power meter 41 for power sale are provided. The load-side switchboard 3 is connected to an AC output unit 205 that outputs the AC 100V.

  Note that in selling power to the electric power company, the voltage of the AC power sent to the AC output unit 205 through the wiring path W3 is made higher than the voltage of the AC power supplied from the commercial power supply 4 by the DC / AC inverter 23. This is done by controlling and causing a reverse power flow to the commercial power source 4 side.

(Function)
An example of control of the power supply system S will be described in detail for each mode with reference to FIGS. The control for switching the mode by the control unit 25 is made to match the time zone classification of each power company that provides the service of the area where the power supply system S is installed. This division is not necessarily the same for each electric power company, and may be different.

In the present embodiment, as shown in FIG. 9 (a), the service time zone is 23:00 to 7:00 (midnight) for A, 7:00 to 10:00 (morning), and 10:00 for B. -18: 00 (noon), C will be described taking as an example a case where it is installed in an area of a power company that is divided between 18:00 and 23:00 (night).
The control unit 25 is managed by program software corresponding to this time zone classification.

  A table of contents is provided to facilitate understanding of the following description of the operation.

(table of contents)
(1) Normal operation
(1-1) A mode: Mode for supplying power from the commercial power source to the load and charging the storage battery
(1-2) B mode: Power supply from the storage battery to the load side, charging from the photovoltaic power generation device to the storage battery, and power sale to the commercial power supply side
(1-3) C mode: Mode to supply power from the storage battery to the load side (2) Operation at power failure
(2-1) D mode: A mode in which power is supplied from the storage battery to the load side.
(2-2) E mode: A mode in which power is supplied from the storage battery to the load side and charging is performed from the photovoltaic power generation device to the storage battery.
(2-3) F mode: A mode in which power is supplied from the storage battery to the load side.

(1) Normal operation Operation in a situation where the commercial power supply is normal (no power failure) and the solar power generator is in operation and can generate electricity during sunshine. The A mode, which will be described later, constitutes the first operation mode, the B mode constitutes the second operation mode, and the C mode constitutes the third operation mode.

(1-1)
A mode: Mode for supplying power from the commercial power source to the load side and charging the storage battery (control at 23:00 to 7:00 at midnight)
Refer mainly to FIG.

In this mode, inexpensive power is supplied from the commercial power source 4. On the one hand, this electric power is supplied to the load side, and on the other hand, the first storage battery module 21 or the second storage battery module 22 is charged. Moreover, the reverse power flow to the commercial power source 4 side, that is, the power sale is not performed.
Hereinafter, the control in this mode will be described in more detail.

  Note that the switches S1 to S7 and S9 are opened / closed and set as shown in FIG. That is, the open / close switch S1 is OFF, the changeover switch S2 is connected to somewhere (not energized), the changeover switch S3 is connected to somewhere (not energized), the open / close switch S4 is OFF, the open / close switch S5 is ON, The changeover switch S6 is turned on (connected to either the first or second storage battery module), the open / close switch S7 is turned on, and the open / close switch S9 is turned on.

In this time zone, inexpensive power is purchased from the commercial power source 4, and AC power is supplied from the AC input / output unit 207 to the power supply control unit 2 through the power meter 40 for power purchase.
Since the open / close switch S7 is ON, the electric power from the commercial power source 4 is directly supplied to the load side as much as there is demand on the load side. Specifically, AC 100 V is output from the AC output unit 205 to the load-side switchboard 3. Further, since the open / close switch S9 is ON, AC 200V is output from the AC output unit 206.

The AC power passing through the wiring path W <b> 6 is detected by the AC load side output sensor 203, and the information is distributed to the control unit 25.
In addition, the maximum charge for performing charge voltage control in minutes in the charging time from 23:00 to 7:00 in the A mode by inputting to program software that is installed in the control unit 25 and controls each mode described later. The cell voltage is set. As an example, the first storage battery module 21 and the second storage battery module 22 are stored in the control unit 25 as a lithium standard cell voltage 3.7 V, a maximum charge cell voltage 4.2 V, and a discharge minimum cell voltage (discharge limit) 3.0 V. Therefore, switching between charge and discharge of the first storage battery module 21 and the second storage battery module 22 is performed by the changeover switches S2 and S3.

  Further, since the open / close switch S5 in the route of the wiring route W5 is ON, the power from the commercial power source 4 input from the AC input / output unit 207 is the first storage battery module connected by switching the changeover switch S6. 21 or the second storage battery module 22 is charged by being converted from AC power to DC power by a charger. At this time, the storage battery module to be charged is appropriately switched based on the information of the storage battery charging characteristic record stored in the control unit 25 by the changeover switch S6 controlled by the control unit 25. In addition, when charging the first storage battery module 21 and the second storage battery module 22, the charging current is adjusted by controlling the charger by the control unit 25.

Management of charging to the first storage battery module 21 and the second storage battery module 22 in this mode is performed, for example, as follows.
Reference is made to FIG.

  First, the first storage battery module 21 of one system performs 100% charge (full charge) of the capacity. When 100% charging of the capacity of the first storage battery module 21 is completed, the switch is switched to the second storage battery module 22 of the other system by the switch S6. Charging to the second storage battery module 22 is stopped, for example, by charging 50% of the capacity. The amount of charge charged in the first storage battery module 21 and the second storage battery module 22 is detected by detecting the voltage of the charged power.

  The purpose of stopping the charging of the second storage battery module 22 at 50% of the capacity is that the second time in the morning and noon time periods (for example, 7:00 to 18:00) when the solar power generation device 1 is generating power. This is because an empty capacity of the storage battery module is necessary when unstable generated power is taken into the storage battery module 22 to make it stable.

  Furthermore, the storage battery has an advantage that damage to the storage battery module can be suppressed and the life can be extended, rather than repeated charging and discharging close to 100% of the capacity. In addition, in the control by the control unit 25, there is also an advantage that the 50% charge of the capacity can be controlled by a half voltage compared to the maximum charge cell voltage of 100% charge. In addition, the charge amount of the storage battery module on the side that creates the free capacity is not limited to 50% charge of the capacity, and can be set as appropriate.

  In addition, the amount of charge charged in the first storage battery module 21 and the second storage battery module 22 in the midnight time zone is, for example, the general demand power amount on the load side (general household etc.) in the morning or night time zone. The reference is set, for example, 6 KW / h, but is not limited to this, and can be set as needed.

(1-2)
B mode: Power supply from the storage battery to the load side, charging from the photovoltaic power generation device to the storage battery, and power sale to the commercial power supply side (control during daytime, 7: 00-18: 00: for example (Morning) 7: 00-10: 00 and (Lunch) 10: 00-18: 00 according to the time zone of the power company
Refer mainly to FIG.

  In this time zone, for example, from 7:00 to 10:00, a somewhat inexpensive power is supplied from the commercial power supply 4, and from 10:00 to 18:00, a normal rate of power is supplied. The solar power generation device 1 is in operation, and the electric power generated by the solar power generation device 1 is not directly supplied to the load side, but is charged once in the first storage battery module 21 or the second storage battery module 22. Stable state. And electric power is discharged from the 1st storage battery module 21 or the 2nd storage battery module 22, and is supplied to the load side.

  When the power consumption on the load side is smaller than the power discharged from the first storage battery module 21 or the second storage battery module 22 (for example, 6 kW / h) and there is surplus power, the power is reversely flowed to the commercial power source 4 and sold. The

In addition, when the amount of power demand on the load side is larger than the amount of electric power that can be discharged from the first storage battery module 21 or the second storage battery module 22, the reverse power flow (power sale) is stopped, and the insufficient amount of power is constantly generated. Supplemented from the commercial power source 4.
Hereinafter, the control in this mode will be described in more detail.

  The switches S1 to S7 and S9 are opened / closed and set as shown in FIG. That is, the open / close switch S1 is ON, the changeover switch S2 is ON (connected to one of the first and second storage battery modules), the changeover switch S3 is ON (connected to either the first or second storage battery module), and the open / close switch S4 is ON, open / close switch S5 is OFF, change-over switch S6 is connected to any one (not energized), open / close switch S7 is ON, and open / close switch S9 is ON.

  In this time zone, power is generated by the solar cell modules 10, 10 a, 10 b, and 10 c, and DC power having an unequal voltage in each system is adjusted to a certain range of voltage by the solar power generation system connection unit 11. DC power sent from the solar power generation system connection unit 11 is input from the DC input unit 204 to the power supply control unit 2 and is regulated by the DC / DC converter 20 to a specified DC voltage, that is, the first storage battery module 21 and the second storage battery module. It is converted into a DC voltage suitable for 22 characteristics.

  In addition, DC generated power from the DC / DC converter 20 input to the first storage battery module 21 or the second storage battery module 22 by the DC input / output balance sensor 200, and any of the first storage battery module 21 and the second storage battery module 22. Whether or not the output of the DC / AC inverter 23 is equivalent is detected based on the balance of the output of the DC discharge power that is discharged from either of them and sent to the DC / AC inverter 23 described later.

  It should be noted that no reverse power flow occurs when the generated power is insufficient relative to the load-side demand power. When the generated power is insufficient, the output voltage of the DC / AC inverter 23 becomes the same voltage (100 V) as that of the commercial power supply 4, and the open / close switch S7 is turned off to prevent the reverse flow of the discharge power. At this time, the control unit 25 ignores the information of the DC input / output balance sensor 200 and gives priority to the power demand output on the load side. On the other hand, the electric power generated by the solar power generation device 1 is charged to the first storage battery module 21 or the second storage battery module 22 as it is.

  The storage battery to be charged is set to one of the first storage battery module 21 and the second storage battery module 22 by the changeover switch S2 controlled by the control unit 25, and the DC power output from the DC / DC converter 20 to this storage battery module To charge. In addition, the storage battery to be discharged is switched to one of the first storage battery module 21 and the second storage battery module 22 (one that is not the storage battery module to be charged) by the changeover switch S3 controlled by the control unit 25.

  In addition, if the charge side 1st storage battery module 21 or the 2nd storage battery module 22 becomes the maximum charge cell voltage, the charging / discharging side of the 1st storage battery module 21 and the 2nd storage battery module 22 will be switched by the changeover switch S2. However, when the demand power amount (power consumption) on the load side is larger than the power generation amount, AC power is output from the DC / AC inverter 23 with priority to output to the load side regardless of the information from the DC input / output balance sensor 200. To do.

  DC power is discharged from the first storage battery module 21 or the second storage battery module 22 connected by the changeover switch S3. As described above, the DC input / output balance sensor 200 detects whether the balance of power with the DC power from the DC / DC converter 20 input to the first storage battery module 21 or the second storage battery module 22 is equivalent.

  If the information from the DC input / output balance sensor 200 is sent to the control unit 25 and the balance of power is equal, a control signal is transmitted from the control unit 25 to the DC / AC inverter 23, and a direct current equivalent to the amount of photovoltaic power generation is obtained. Electric power is converted into AC power, and output as supply power and surplus power to the load side. Whether there is surplus power and the power shortage on the load side are detected by the control unit 25 based on the difference between the information from the AC load side output sensor 203 and the data of the AC discharge output sensor 202.

The AC single-phase three-wire anode two-wire output balance sensor 201 senses and corrects the balance of the anode two wires of the output of the DC / AC inverter 23.
Note that the opening / closing switch S4 is turned off when the first storage battery module 21 or the second storage battery module 22 in the A mode (charging mode) is charged as described above, and prevents backflow. Moreover, when overdischarge from the 1st storage battery module 21 or the 2nd storage battery module 22 is prevented (the discharge minimum cell voltage is managed by the control part 25), it is set to OFF.

Also, AC100V is output from the AC output unit 205 to the load-side switchboard 3. Information on the power demand amount on the load side is transmitted to the control unit 25 by the AC load side output sensor 203. Since the open / close switch S9 is ON, AC 200V is output from the AC output unit 206.
The open / close switch S9 is turned off only in the late-night time zone from 23:00 to 7:00 at the time of power failure of the commercial power source 4 to be described later.

  On the other hand, the open / close switch S7 for linking with the commercial power source 4 is ON, and the output voltage is adjusted by the DC / AC inverter 23 so that the voltage becomes higher than the voltage (100V) of the commercial power source 4 (for example, The power is sold by causing the remaining power consumption (surplus power) on the load side to flow backward to the commercial power source 4 side.

  Further, when the output voltage from the DC / AC inverter 23 of the stored power of the first storage battery module 21 and the second storage battery module 22 becomes the same as the voltage of the AC power from the commercial power supply 4 input to the AC input / output unit 207, The on / off switch S7 is turned off, and reverse power flow to the AC input / output unit 207 is prevented.

Management of charging and discharging of the first storage battery module 21 and the second storage battery module 22 in this mode is performed as follows, for example.
Reference is made to FIG.

  In the A mode, the power stored in the first storage battery module 21 and the second storage battery module 22 is output as supply power and surplus power to the load side as described above. On the other hand, the electric power generated by the solar power generation device 1 is charged in an empty capacity portion of 50% of the capacity of the second storage battery module 22. That is, the first storage battery module 21 of one system is discharged and the second storage battery module 22 of the other system is charged.

  Then, when the second storage battery module 22 reaches 100% capacity (full charge), the changeover switch S2 and the changeover switch S3 are switched under the control of the control unit 25. That is, contrary to the above, the photovoltaic power generation apparatus 1 generates power in the first storage battery module 21 that is discharged from the second storage battery module 22 that is 100% charged, and a part of the electric power is discharged, resulting in an empty storage capacity. The charged power is charged.

  Thereafter, when one storage battery module is charged at 100% capacity, the changeover switch S2 and the changeover switch S3 are switched, and the storage battery module on the charging side and the discharging side are switched. At this time, before the charged storage battery module is charged to 100% of the capacity, the discharged storage battery module reaches a preset discharge limit (for example, 50% of the capacity). Then, this is prioritized and the charge-side and discharge-side storage battery modules are switched as described above.

(1-3)
C mode: Power supply from the storage battery to the load side (control at night time, 18: 00-23: 00)
Reference is mainly made to FIG.

  This time zone is a time zone in which slightly inexpensive power is supplied from the commercial power source 4. Moreover, the solar power generation device 1 is not generating electric power. And the electric power discharged from the 1st storage battery module 21 or the 2nd storage battery module 22 is supplied to the load side.

When the amount of power demand on the load side is not larger than the amount of power discharged from the first storage battery module 21 or the second storage battery module 22, the insufficient power is supplemented from the commercial power supply 4. Further, even if the load side demand power is less than the power discharged from the first storage battery module 21 or the second storage battery module 22 and the power from the first storage battery module 21 or the second storage battery module 22 has a margin, the commercial power source 4 No power is sold to the side.
Hereinafter, the control in this mode will be described in more detail.

  In this time zone, the switches S1 to S7 and S9 are opened / closed and set as shown in FIG. 5 by a control signal from the control unit 25. That is, the open / close switch S1 is OFF, the changeover switch S2 is connected to any one (not energized), the changeover switch S3 is ON (connected to either the first or second storage battery module), the open / close switch S4 is ON, open / close The switch S5 is OFF, the changeover switch S6 is connected to any one (not energized), the open / close switch S7 is ON, and the open / close switch S9 is ON.

With the changeover switch S3 controlled by the control unit 25, the first storage battery module 21 or the second storage battery module 22 to be discharged is appropriately switched and discharged from the connected first storage battery module 21 or the second storage battery module 22.
The DC input / output balance sensor 200 is not functioning, and the discharged DC power is sent to the DC / AC inverter 23. The DC / AC inverter 23 adjusts the AC output voltage output from the DC / AC inverter 23 by a control signal from the control unit 25 based on detection information of the AC discharge output sensor 202 and the AC load output sensor 203 (commercial power supply 4 When the amount of discharge is insufficient with reference to the voltage of the power source, the shortage is supplemented by the commercial power supply 4 with the same voltage).

The AC single-phase three-wire anode two-wire output balance sensor 201 senses the alternating current output from the DC / AC inverter 23 and performs anode correction. That is, the single-phase three-wire is composed of two anodes 100V and one cathode, and the load-side switchboard is divided into 100V such that 200V is obtained by connecting two 100V, but each circuit breaker is provided with 2 Since 100 V of the book is in an unbalanced state, the control unit 25 controls the anode balance of the DC / AC inverter 23 based on the information of the AC discharge output sensor 202.
Further, the AC discharge output sensor 202 transmits a signal representing the output power amount from the DC / AC inverter 23 to the control unit 25.

  Information on the power demand amount on the load side is transmitted to the control unit 25 by the AC load side output sensor 203. AC100V is output from the AC output unit 205 to the load-side switchboard 3, and since the open / close switch S9 is ON, the AC output unit 206 outputs AC200V.

  On the other hand, the open / close switch S7 is ON, and the shortage of power on the load side can be purchased from the commercial power source 4 through the watt-hour meter 40 for power purchase. Specifically, when the demand power on the load side exceeds the output of the DC / AC inverter 23 and the power shortage is detected by the AC discharge output sensor 202 and the load AC output sensor 203, the output voltage of the DC / AC inverter 23 is the commercial power supply. 4 is supplemented with the power shortage from the commercial power source 4. After that, when the discharge power amount of the first storage battery module 21 or the second storage battery module 22 reaches the minimum cell voltage (discharge limit), the control unit 25 turns off the open / close switch S4 to control the discharge.

The management of the discharge of the first storage battery module 21 or the second storage battery module 22 in this mode is performed as follows, for example.
Reference is made to FIG.

  In the A mode or the B mode, the power stored in the first storage battery module 21 and the second storage battery module 22 is output as the supply power to the load side as described above. Moreover, when the amount of power demand on the load side is large and the amount of power that can be discharged from the first storage battery module 21 or the second storage battery module 22 is insufficient, the amount of power that is not enough to purchase power from the commercial power supply 4 is supplemented. Is done.

(2) Operation during a power failure Operation when the commercial power source is out of power and the solar power generator is in operation and can generate electricity during sunshine. The mode D to be described later constitutes the fourth operation mode described in the claims, and the mode E also constitutes the fifth operation mode.

(2-1)
D mode: Power supply from the storage battery to the load side (midnight time, control from 23:00 to 7:00)
Reference is mainly made to FIG.

  Since power is not supplied from the commercial power supply 4 due to a power failure, and the solar power generation device 1 is not generating power during this time, power is supplied only from the first storage battery module 21 or the second storage battery module 22. The electric power discharged from the first storage battery module 21 or the second storage battery module 22 is supplied to the load side.

During this time, the AC output of 200V is OFF, and the demand power (power consumption) on the load side of 100V is very small, but the necessary and sufficient capacity to meet the load power consumption from 18:00 to 7:00 Are mounted. The first storage battery module 21 and the second storage battery module 22 are mounted.
Hereinafter, the control in this mode will be described in more detail.

  In this time zone, the switches S1 to S7 and S9 are opened / closed and set as shown in FIG. 6 by a control signal from the control unit 25. That is, the open / close switch S1 is OFF, the changeover switch S2 is connected to any one (not energized), the changeover switch S3 is ON (connected to either the first or second storage battery module), the open / close switch S4 is ON, open / close The switch S5 is OFF, the changeover switch S6 is connected to any one (not energized), the open / close switch S7 is OFF, and the open / close switch S9 is OFF.

With the changeover switch S3 controlled by the control unit 25, the first storage battery module 21 or the second storage battery module 22 to be discharged is appropriately switched and discharged from the connected first storage battery module 21 or the second storage battery module 22.
The DC input / output balance sensor 200 is not functioning, and the discharged DC power is sent to the DC / AC inverter 23.

The AC single-phase three-wire anode two-wire output balance sensor 201 senses the alternating current output from the DC / AC inverter 23 and performs anode correction.
The AC discharge output sensor 202 transmits a signal representing the output power amount from the DC / AC inverter 23 to the control unit 25.

Information on the power demand amount on the load side is transmitted to the control unit 25 by the AC load side output sensor 203.
AC 100 V is output from the AC output unit 205 to the load-side switchboard 3. The on / off switch S9 is OFF, and AC power of 200V is not output from the AC output unit 206 to the load side.
On the other hand, the open / close switch S7 is OFF, so that a reverse power flow toward the commercial power source 4 can be prevented.

(2-2)
E mode: A mode in which power is supplied from the storage battery to the load side, and charging from the photovoltaic power generation device to the storage battery (control during daytime, 7: 00-18: 00)
Refer mainly to FIG.

Power is not supplied from the commercial power supply 4 due to a power failure. In this time zone, the solar power generation device 1 generates power. The electric power generated by the solar power generation device 1 is not directly supplied to the load side, but is once charged in the first storage battery module 21 or the second storage battery module 22 to be in a stable state. And electric power is discharged from the 1st storage battery module 21 or the 2nd storage battery module 22, and is supplied to the load side.
Hereinafter, the control in this mode will be described in more detail.

  In this time zone, the switches S1 to S7 and S9 are opened and closed and set as shown in FIG. That is, the open / close switch S1 is ON, the changeover switch S2 is ON (connected to one of the first and second storage battery modules), the changeover switch S3 is ON (connected to either the first or second storage battery module), and the open / close switch S4 is ON, open / close switch S5 is OFF, change-over switch S6 is connected to any one (not energized), open / close switch S7 is OFF, and open / close switch S9 is ON.

Electric power is generated by the solar cell modules 10, 10 a, 10 b, and 10 c, and DC power having an unequal voltage in each system is adjusted to a voltage within a certain range by the solar power generation system connection unit 11.
DC power sent from the solar power generation system connection unit 11 is input from the DC input unit 204 to the power supply control unit 2 and is regulated by the DC / DC converter 20 to a specified DC voltage, that is, the first storage battery module 21 and the second storage battery module. It is converted into a DC voltage suitable for 22 characteristics.

  Whether the balance between the power generated from the DC / DC converter 20 input to the first storage battery module 21 or the second storage battery module 22 and the power transmitted to the DC / AC inverter 23 described later is equal by the DC input / output balance sensor 200 Detect if.

  The storage battery to be charged is set to one of the first storage battery module 21 and the second storage battery module 22 by the changeover switch S2 controlled by the control unit 25, and the DC power output from the DC / DC converter 20 to this storage battery module To charge. In addition, the storage battery to be discharged is switched to one of the first storage battery module 21 and the second storage battery module 22 (one that is not the storage battery module to be charged) by the changeover switch S3 controlled by the control unit 25.

  DC power is discharged from the first storage battery module 21 or the second storage battery module 22 connected by the changeover switch S3. As described above, the DC input / output balance sensor 200 detects whether the balance of power with the DC power from the DC / DC converter 20 input to the first storage battery module 21 or the second storage battery module 22 is equivalent.

  If the information from the DC input / output balance sensor 200 is sent to the control unit 25 and the balance of power is equal, a control signal is transmitted from the control unit 25 to the DC / AC inverter 23, and a direct current equivalent to the amount of photovoltaic power generation is obtained. Electric power is converted into AC power, and output as supply power and surplus power to the load side. Whether there is surplus power is detected by the control unit 25 based on information from the AC discharge output sensor 202 and the AC load side output sensor 203.

  The AC single-phase three-wire anode two-wire output balance sensor 201 senses and corrects the balance of the anode two wires of the output of the DC / AC inverter 23. Then, the AC discharge output sensor 202 transmits information on the amount of solar power to the control unit 25. The open / close switch S4 is turned off when the first storage battery module 21 or the second storage battery module 22 is charged from 23:00 to 7:00 in the A mode to prevent backflow. Moreover, it also turns OFF when overdischarge from the 1st storage battery module 21 or the 2nd storage battery module 22 is prevented.

The AC discharge output sensor 202 and the AC load side output sensor 203 transmit the load side demand power amount information to the control unit 25. With this information, AC 100 V is output from the AC output unit 205 to the load-side switchboard 3. Further, since the open / close switch S9 is ON, AC 200V is output from the AC output unit 206.
On the other hand, the open / close switch S7 for linking with the commercial power source 4 is OFF, and a reverse power flow to the commercial power source 4 side is prevented.

As described above, in the E mode, when the commercial power supply 4 side fails during power generation by the solar power generation device 1, the generated power is charged into the first storage battery module 21 or the second storage battery module 22 and stored. Power can be supplied to the load 3 side in parallel by discharging the electric power, so that sufficient electric power can be supplied to the load side. It is not necessary to stop the photovoltaic power generation apparatus 1 as in the prior art.
Therefore, even in the above situation, the operation of the solar power generation apparatus 1 having a sufficient margin in the amount of power generation with respect to the power demand in ordinary households can be continued especially in the daytime in fine weather, and the independent operation becomes possible. Thereby, it is possible to prevent a power outage or power shortage from occurring on the load 3 side even during a power outage on the commercial power source 4 side during sunshine.

(2-3)
F mode: A mode to supply power from the storage battery to the load side (at night time, control from 18:00 to 23:00)
Reference is mainly made to FIG.

  Power is not supplied from the commercial power supply 4 due to a power failure. Since the solar power generation device 1 does not generate power during this time, power is supplied only from the first storage battery module 21 or the second storage battery module 22. The electric power discharged from the first storage battery module 21 or the second storage battery module 22 is supplied to the load side.

  In this time zone, the switches S1 to S7 and S9 are opened / closed and set as shown in FIG. 8 by a control signal from the control unit 25. That is, the open / close switch S1 is OFF, the changeover switch S2 is connected to any one (not energized), the changeover switch S3 is ON (connected to either the first or second storage battery module), the open / close switch S4 is ON, open / close The switch S5 is OFF, the changeover switch S6 is in a connected state (not energized), the open / close switch S7 is OFF, and the open / close switch S9 is ON. The only difference from the D mode is that the open / close switch S9 is ON.

  The specific control in this mode is the same as that in the D mode except that the open / close switch S9 is turned ON and AC 200V is output from the AC output unit 206. Description of control is omitted.

  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 Power supply system D Power supply apparatus 1 Solar power generation device 10, 10a, 10b, 10c Solar cell module 11 Solar power generation system connection part 2 Power supply control part 20 DC / DC converter 21 1st storage battery module 22 2nd storage battery module 23 DC / AC inverter 24 DC power module 25 Control unit 26 Cooling fan 27 Heating heater 200 DC input / output balance sensor 201 AC single-phase three-wire anode two-wire output balance sensor 202 AC discharge output sensor 203 AC load side output sensor 204 DC input Section 205 AC output section 206 AC output section 207 AC input / output section 3 Load side switchboard 4 Commercial power supply 40 Electricity meter for power purchase 41 Electricity meter for power sale 42 Breaker S1 Open / close switch S2, S3 Changeover switch S4, S5 Open / close switch S6 switching Switch S7 to S11 Open / close switch W1 to W10 Wiring path

Claims (5)

Linked with the commercial power supply side and the load side, converts the unstable DC power generated by the solar power generator or wind power generator into stable DC power, converts the stable DC power into AC power, A power supply device for supplying,
A solar power generator or a wind power generator;
A DC / DC converter that converts direct-current power supplied from the solar power generation device or wind power generation device into direct-current power adjusted to a specified voltage in accordance with the characteristics of the storage battery to be charged;
A storage battery for charging DC power output from the DC / DC converter;
A DC / AC inverter that converts DC power discharged from the storage battery into AC power;
With
The AC power converted by the DC / AC inverter is supplied to the load side.
Power supply device. The power supply device has a control means, and when the photovoltaic power generation device or the wind power generation device is generating power, if the commercial power supply side has a power failure, the control means Control to avoid power outages or power shortages on the load side by charging the power from the wind power generator to one of the multiple storage batteries and simultaneously discharging it from other storage batteries to the load side including,
The power supply apparatus according to claim 1. In the control of charging the power from the solar power generation device or the wind power generation device to one storage battery among the storage batteries composed of a plurality of systems, and simultaneously discharging from the storage battery of another system, the control means,
Before the discharging storage battery reaches the discharge limit, the discharging storage battery is switched to the charging side, and the storage battery of another system different from the discharging storage battery is switched to the discharging side. Including control,
The power supply apparatus according to claim 2. The power supply apparatus includes a control unit, and the control unit includes:
When the solar power generation device or the wind power generation device is not generating power, the AC power input from the commercial power supply side is supplied to the load side, and the AC power is converted into DC power and the storage battery is charged. A first operation mode;
When the solar power generator or wind power generator is generating power, the storage battery is charged with DC power input from the solar power generator or wind power generator, and the DC power is discharged from the storage battery and converted to AC power. When the discharge power is greater than the demand power on the load side, the surplus is reversed to the commercial power supply side, and when the discharge power is less than the demand power on the load side, the insufficient power is supplied to the load side. A second operation mode in which control is performed from the commercial power supply side and supplied to the load side;
When the solar power generation device or the wind power generation device is not generating power, the DC power discharged from the storage battery is converted to AC power and supplied to the load side, and when the discharge power is less than the load side demand power, A third operation mode in which the shortage of electric power is supplemented from the commercial power source side and supplied to the load side;
A fourth operation mode for performing control to convert the DC power discharged from the storage battery into AC power and supply it to the load side when the commercial power supply side fails and the solar power generator or the wind power generator is not generating power; ,
When the commercial power supply side has a power failure and the solar power generator or wind power generator is generating power, the DC power discharged from the storage battery is converted to AC power and supplied to the load side. A fifth operation mode for performing control for charging the storage battery with DC power input from the device;
Including control to do
The power supply apparatus according to claim 1. Between the commercial power supply side and the load side, the power supply device according to any one of claims 1 to 4 is arranged in cooperation.
Power supply system.

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