WO2019053824A1

WO2019053824A1 - Power adjusting apparatus for solar power plant, power generation system, and power adjusting method for solar power plant

Info

Publication number: WO2019053824A1
Application number: PCT/JP2017/033099
Authority: WO
Inventors: 祐平山本; 輝王
Original assignee: 祐平山本
Priority date: 2017-09-13
Filing date: 2017-09-13
Publication date: 2019-03-21
Also published as: JPWO2019053824A1

Abstract

A power adjusting apparatus for a solar power plant according to the present invention is provided with: a storage battery; and a switcher including a plurality of switch elements having input terminals to which are connected a plurality of respective power generation units, which are provided in correspondence to power conditioners and each of which includes one or more solar battery cells, first output terminals connected to the power conditioners, and second output terminals connected to the storage battery. By operating each of the switch elements, the switcher switches the connection destination of each of the power generation units to either the power conditioner or the storage battery.

Description

POWER REGULATOR FOR SOLAR POWER PLANT, POWER GENERATING SYSTEM, AND POWER CONTROL METHOD FOR SOLAR POWER PLANT

The present disclosure relates to a power conditioning device for a solar power plant, a power generation system, and a power conditioning method for a solar power plant.

In recent years, solar power plants that use solar cells to generate electric power by sunlight are operating in various places. Solar power plants supply generated power to the power system, but can not supply power to the power system beyond the contract power contracted with the power company.
Because the amount of electricity generated by solar cells depends on the amount of solar radiation, it decreases in the morning and evening and is susceptible to the weather. Therefore, in order to generate as much electric power as possible for as long as possible in a day, a solar power plant is generally provided with a solar cell having a generation capacity exceeding the contracted electric power.
Therefore, for example, in a sunny daytime, the power generated by the solar cell exceeds the contract power. Therefore, the surplus power is effectively used by storing the surplus power exceeding the contract power with a storage battery and discharging the stored power at night or the like (for example, see Patent Document 1).

JP, 2017-60375, A

For example, in the power supply system described in Patent Document 1, when the generated power of the solar power generation device exceeds the specified power, the power transmission control device distributes the generated power of the solar power generation device to generate power corresponding to the specified power. Power is transmitted to the power company via the power transmission network, and at the same time, surplus power exceeding specified power is stored in the storage battery.
Also, for example, in the power supply system described in Patent Document 1, when the generated power of the solar power generation device falls below the prescribed power, the power transmission control device combines the generated power of the solar power generation device and the power from the storage battery. Supply electricity to the power company through the transmission grid.
As described above, in the power supply system described in Patent Document 1, since the power transmission control device performs distribution and combination of power, the configuration of the power transmission control device tends to be complicated.

In view of the above-described circumstances, at least one embodiment of the present invention provides a power conditioning device for a solar power plant, a power generation system, and a power conditioning method for a solar power plant, which can effectively use surplus power with a simple circuit configuration. With the goal.

(1) A power conditioner for a solar power plant according to at least one embodiment of the present invention,
A storage battery,
An input terminal provided corresponding to the power conditioner and connected to each of a plurality of power generation units including one or more solar battery cells, a first output terminal connected to the power conditioner, and the storage battery A switcher including a plurality of switch elements having a second output terminal connected to the
The switcher is configured to be able to switch the connection destination of each of the power generation units to either the power conditioner or the storage battery by the operation of each of the switch elements.

In the configuration of the above (1), since the connection destination of each power generation unit can be switched by the operation of the switch element of the switcher, switching of the power supply destination generated by each power generation unit or power generation by each power generation unit The distributed power can be realized by a simple circuit configuration. Therefore, by operating the switch elements of the switcher, for example, part of the power generated by each power generation unit can be supplied to the power conditioner, and the surplus can be stored in the storage battery. As a result, since it is not necessary to use a circuit for performing distribution and combination of power which tends to have a complicated circuit configuration, surplus power can be effectively used with a simple circuit configuration.

(2) In some embodiments, in the configuration of (1) above,
An output circuit provided between the first output terminal and the power conditioner;
A discharge circuit provided between the storage battery and the power conditioner;
The discharge circuit is directly connected to the output circuit without passing through a combining circuit that combines the power from the plurality of power generation units and the power from the storage battery.

In the configuration of the above (2), the power from the storage battery is directly output to the output circuit and supplied to the power conditioner without passing through a combining circuit that combines the power from the plurality of power generation units and the power from the storage battery. . Thereby, since it is not necessary to provide the synthetic | combination circuit which synthesize | combines the electric power from a some electric power generation part and the electric power from a storage battery, the circuit structure in the power adjustment apparatus for solar power stations can be simplified.

(3) In some embodiments, in the configuration of (1) or (2) above,
And an output permission unit that permits or prohibits the output of power from the storage battery to the power conditioner,
The switcher operates the at least one switch element to switch the connection destination of the power generation unit to the power condition only when the output permission unit prohibits the output of power from the storage battery to the power conditioner. Configured to switch to the
The output permission unit outputs the power from the storage battery to the power conditioner only when the connection destinations of all the power generation units are switched to the storage battery by the operation of the switch element in the switcher. Configured to allow.

In the configuration of (3), the power from the plurality of power generation units and the power from the storage battery are alternatively input to the power conditioner by the switcher and the output permission unit. Thereby, since it is not necessary to provide the synthetic | combination circuit which synthesize | combines the electric power from a some electric power generation part and the electric power from a storage battery, the circuit structure in the power adjustment apparatus for solar power stations can be simplified.

(4) In some embodiments, in the configuration according to any one of the above (1) to (3), the switcher is configured to operate each of the plurality of power generation units according to the generated power of the plurality of power generation units The connection destination of the power generation unit is configured to be switched to either the power conditioner or the storage battery.

In the configuration of the above (4), the connection destinations of the respective power generation units are switched according to the generated power of the plurality of power generation units, so for example, when the power supplied from the power generation unit to the power conditioner becomes large It is also possible to switch the connection destination of the power generation unit to a storage battery and store it in the storage battery. Thereby, the surplus power can be effectively used with a simple circuit configuration.

(5) In some embodiments, in the configuration according to any one of the above (1) to (4), the switcher is configured such that the power supplied from the plurality of power generation units to the power conditioner has a first specified value. When it exceeds, by the operation of at least one said switch element, it is comprised so that the connecting point of the said electric power generation part may be switched to the said storage battery.

In the configuration of (5), the connection destination of at least one power generation unit is switched to the storage battery when the power supplied from the plurality of power generation units to the power conditioner exceeds the first predetermined value, the first predetermined value is exceeded. The surplus power can be effectively used by storing the surplus power in a storage battery.

(6) In some embodiments, in the configuration according to any one of the above (1) to (5), the switcher is configured such that the power supplied from the plurality of power generation units to the power conditioner has a first specified value. The number of switch elements operated to switch the connection destination of the power generation unit to the storage battery is changed so as not to exceed the number.

For example, if the power conditioner can not output power beyond the first specified value, for example, if the first specified value is a value corresponding to the contracted power amount contracted with the power company, the power exceeding the first specified value is Even if power is supplied from the power generation unit to the power conditioner, surplus power exceeding the first specified value is released as heat by the power conditioner, and the surplus power can not be effectively used.
On the other hand, in the configuration of (6), the number of power generation units whose storage destinations are storage batteries is changed so that the power supplied from the plurality of power generation units to the power conditioner does not exceed the first specified value. Therefore, the surplus power can be stored in the storage battery instead of being released as heat by the power conditioner. Thereby, surplus power can be used effectively.

(7) In some embodiments, in any one of the configurations (1) to (6), the switcher is configured to set the first prescribed value of the power supplied from the plurality of power generation units to the power conditioner. It is configured to change the number of switch elements operated to switch the connection destination of the power generation unit to the storage battery so as to be the largest within the range not exceeding.

In the configuration of the above (7), the power supplied to the power conditioner is increased within the range not exceeding the first specified value, so that it is possible to suppress the reduction of the power output to the power system.

(8) In some embodiments, in any one of the configurations (1) to (7), the switcher is configured to set the first prescribed value of the power supplied from the plurality of power generation units to the power conditioner. When the connection destination of the power generation unit is switched to the storage battery by the operation of at least one of the switch elements when exceeding, when the power supplied from the plurality of power generation units to the power conditioner falls below a second prescribed value The connection destination of the power generation unit, which is the storage battery, is switched to the power conditioner by the operation of at least one of the switch elements.

In the configuration of (8), when the power supplied from the plurality of power generation units to the power conditioner falls below the second specified value, the connection destination is the storage battery whose power storage unit is a storage battery by the operation of at least one switch element. Since the power conditioner is switched to the power conditioner, the power supplied to the power conditioner can be increased. Thereby, the power to be output to the power system can be increased.

(9) In some embodiments, in any one of the configurations (1) to (8), the switcher is configured to control the voltage of the power supplied from the plurality of power generation units to the power conditioner as the power conditioner. When the minimum starting voltage of the power supply is lower than the minimum starting voltage, the connection destination of all the power generation units is switched to the storage battery by the operation of the switch element.

Even if the voltage of the power supplied from the plurality of power generation units to the power conditioner falls below the minimum start-up voltage of the power conditioner, the storage battery may be able to store electricity. In such a case, according to the configuration of (9), since the connection destinations of all the power generation units are switched to the storage battery, the storage battery can be stored with the power from the power generation unit. Thereby, the power generated by the power generation unit can be effectively used.

(10) In some embodiments, in the configuration according to any one of the above (1) to (9), the switcher is configured such that the voltage of the power supplied from the plurality of power generation units to the power conditioner is the power conditioner. If the minimum starting voltage of the power supply is lower than the minimum starting voltage, the connection destination of all the power generation units is switched to the storage battery by the operation of the switch element, and then the voltage of the power supplied to the storage battery from the plurality of power generation units When the minimum starting voltage of the conditioner is exceeded, the connection destination of all the power generation units is switched to the power conditioner by the operation of the switch element.

For example, when the solar radiation amount decreases due to the deterioration of the weather and the voltage of the power supplied from the plurality of power generation units to the power conditioner falls below the minimum startup voltage of the power conditioner, the solar radiation amount is restored due to the weather recovery. As the voltage increases, the voltage of the power supplied from the plurality of power generation units to the power conditioner again exceeds the minimum starting voltage of the power conditioner.
In such a case, according to the configuration of (10), when the voltage of the power supplied from the plurality of power generation units to the storage battery exceeds the minimum startup voltage of the power conditioner, all the power generation is performed by the operation of the switch element The connection destination of the unit is switched from the storage battery to the power conditioner. Thus, the amount of power supplied to the power conditioner can be increased, and the amount of power output to the power system can be increased.

(11) In some embodiments, in any of the configurations (1) to (10),
The storage battery has a storage battery cell group in which a plurality of storage battery cells are connected,
The output voltage of the storage battery cell group is within the range of applicable voltage on the input side of the power conditioner.

In the configuration of the above (11), since the output voltage of the storage battery cell group is within the range of the compatible voltage of the input side of the power conditioner, the output voltage of the storage battery cell group is the available voltage of the input side of the power conditioner. It is possible to eliminate the need for a DC-DC converter that changes within the range. Thereby, the device configuration can be simplified.

(12) In some embodiments, in any one of the configurations (1) to (11), the number of the storage battery is one, and power can be supplied to a plurality of the power conditioners.

In the configuration of the above (12), the number of storage batteries can be suppressed to suppress the cost increase.

(13) In some embodiments, in any one of the configurations (1) to (11), a plurality of the storage batteries are provided corresponding to a plurality of the power conditioners.

In the configuration of the above (13), a plurality of storage batteries are provided corresponding to a plurality of power conditioners, and as described in the above (1), switchers are provided corresponding to the power conditioner. Therefore, in the power conditioner for a solar power plant according to the configuration of (13), a plurality of power conditioners having a simple circuit configuration may be installed according to the number of installed power conditioners, so a plurality of power conditioners are installed. Even in this case, surplus power can be effectively used with a simple circuit configuration.

(14) A power generation system according to at least one embodiment of the present invention,
Power conditioner,
A plurality of power generation units provided corresponding to the power conditioner, each including one or more solar cells;
A power conditioner for a solar power plant according to any one of the above (1) to (13);
Equipped with

In the configuration of the above (14), since the power conditioner for the solar power plant of the configuration of the above (1) is included, as described in the above (1), for example, Since a part of the generated electric power can be supplied to the power conditioner and the surplus can be stored in the storage battery, the surplus electric power can be effectively used with a simple circuit configuration.

(15) A power adjustment method for a solar power plant according to at least one embodiment of the present invention, wherein each of a plurality of power generation units provided corresponding to the power conditioner and including one or more solar battery cells is connected A switcher including a plurality of switch elements each having a first input terminal connected to the power conditioner, a first output terminal connected to the power conditioner, and a second output terminal connected to the storage battery; And a switching step of switching a connection destination of the power generation unit to either the power conditioner or the storage battery.

In the method of the above (15), there is provided a switching step of switching the connection destination of each power generation unit to either the power conditioner or the storage battery by the operation of each switch element, so simple control such as switch control of switch elements Depending on the content, surplus power can be used effectively.

According to at least one embodiment of the present invention, surplus power can be effectively used with a simple circuit configuration. Moreover, according to at least one embodiment of the present invention, surplus power can be effectively used by simple control contents.

It is a figure showing the whole composition of the solar power plant concerning some embodiments. It is a figure explaining the case where multiple electric power generation systems shown in Drawing 1 are installed in a solar power station concerning one embodiment. It is a figure showing the state where the input terminal of one switch element in a switcher was connected with the 2nd output terminal. It is a figure showing the whole structure of the solar power station concerning other embodiment. It is a figure which shows the example of embodiment which comprised the 1st prescription | regulation value and the 2nd prescription | regulation value so that a change was possible by the instruction | indication from the exterior of a solar power station.

Hereinafter, several embodiments of a power conditioning device for a solar power plant, a power generation system, and a power conditioning method for a solar power plant according to the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely illustrative. Absent.
For example, a representation representing a relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” is strictly Not only does it represent such an arrangement, but also represents a state of relative displacement with an angle or distance that allows the same function to be obtained.
For example, expressions that indicate that things such as "identical", "equal" and "homogeneous" are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state.
For example, expressions representing shapes such as quadrilateral shapes and cylindrical shapes not only represent shapes such as rectangular shapes and cylindrical shapes in a geometrically strict sense, but also uneven portions and chamfers within the range where the same effect can be obtained. The shape including a part etc. shall also be expressed.
On the other hand, the expressions "comprising", "having", "having", "including" or "having" one component are not exclusive expressions excluding the presence of other components.

FIG. 1 is a diagram showing the overall configuration of a solar power plant according to some embodiments.
A power generation system 1 of a solar power plant according to some embodiments includes a power conditioner 10, a solar cell group 20, and a power adjustment device 100.
The power conditioner 10 is a device that converts DC power generated by the solar cell group 20 into AC power and outputs the AC power to the power system. The solar cell group 20 includes a plurality of power generation units 22 to which a plurality of solar cell modules 21 including at least one solar battery cell are connected. In the following description, the power generation unit 22 is also referred to as a string 22.

The power conditioning apparatus 100 is a power conditioning apparatus for the power generation system 1, that is, a solar power plant, and includes a storage battery 110 and a switcher 120. Power adjustment apparatus 100 includes an output circuit 131 provided between a first output terminal 121 of switcher 120 described later and power conditioner 10, and a discharge circuit 132 provided between storage battery 110 and power conditioner 10. And an output permission unit 133 provided in the discharge circuit 132. The power adjustment device 100 includes a control circuit 141, a voltage sensor 142, and a current sensor 143.

Storage battery 110 includes storage battery cell group 112 to which a plurality of storage battery cells 111 are connected, charging device 113 for charging storage battery cell group 112, and output device 114 for outputting the power stored in storage battery cell group 112 to the outside. And.
Storage battery 110 stores the power generated by each power generation unit 22 in storage battery cell group 112, and outputs the stored power to power conditioner 10.

Charging device 113 converts a voltage of the input power into a voltage suitable for charging storage battery cell group 112 (not shown), and a charge controller (not shown) controlling charging of storage battery cell group 112 And. The charge controller controls each part of the charging device 113 to start and stop charging of the storage battery cell group 112 based on, for example, a control signal of the control circuit 141. Also, the charge controller monitors, for example, the remaining charge amount of the storage battery cell group 112 being charged, and stops the charging of the storage battery cell group 112 when it is determined that the storage battery cell group 112 is fully charged. Control each part.

Output device 114 includes a DC-DC converter (not shown) for converting the voltage of the power stored in storage battery cell group 112 into a voltage suitable for output to power conditioner 10, and the output of the power stored in storage battery cell group 112. And a discharge controller (not shown) to control. The discharge controller controls each part of the output device 114 to start and stop the discharge of the power stored in the storage battery cell group 112 to the outside based on, for example, a control signal of the control circuit 141. In addition, the discharge controller monitors, for example, the remaining charge of storage battery cell group 112 so that storage battery cell group 112 is not in the overdischarged state, and determines that the remaining charge capacity has decreased to a predetermined remaining charge amount. Each part of the output device 114 is controlled to stop the discharge from the group 112.
If the output voltage of storage battery cell group 112 is within the range of the compatible voltage at the input side of power conditioner 10, it is not necessary to provide a DC-DC converter in output device 114, so the device configuration can be simplified. , You can reduce the cost.

The switcher 120 is a device that switches the connection destination of each power generation unit 22 to either the power conditioner 10 or the storage battery 110, and is a switch element 124 having a first output terminal 121, a second output terminal 122, and an input terminal 123. Contains more than one. Each switch element 124 individually switches whether to connect the input terminal 123 and the first output terminal 121 or to connect the input terminal 123 and the second output terminal 122 by a control signal from the control circuit 141 described later. It is configured to be possible. Each switch element 124 of the switcher 120 may be a mechanical switch or a relay having a mechanical contact, or may be a semiconductor switch. It is sufficient if it can be switched.

Each first output terminal 121 is connected to the input side of the power conditioner 10 via the output circuit 131, respectively. The second output terminals 122 are each connected to the charging device 113 of the storage battery 110. Each of the plurality of power generation units 22 is connected to each input terminal 123.

One end of the discharge circuit 132 is connected to the output device 114 of the storage battery 110, and the other end is connected to the output circuit 131.
That is, some embodiments include an output circuit 131 provided between the first output terminal 121 and the power conditioner 10, and a discharge circuit 132 provided between the storage battery 110 and the power conditioner 10. The discharge circuit 132 is directly connected to the output circuit 131 without passing through a combining circuit that combines the power from the plurality of power generation units 22 and the power from the storage battery 110.
Therefore, the power from the storage battery 110 is directly output to the output circuit 131 and supplied to the power conditioner 10 without passing through a combining circuit that combines the power from the plurality of power generation units 22 and the power from the storage battery 110. Thus, there is no need to provide a combining circuit that combines the power from the plurality of power generation units 22 and the power from the storage battery 110, so the circuit configuration in the power adjustment device 100 can be simplified.

The output permission unit 133 is, for example, a switch provided in the discharge circuit 132 to open or close the discharge circuit 132 or a disconnector, and opens or closes the discharge circuit 132 by a control signal from a control circuit 141 described later. The output of power from storage battery 110 to power conditioner 10 is permitted or prohibited.

The control circuit 141 is a control circuit that controls each part of the power adjustment apparatus 100. The control contents of the control circuit 141 will be described later.
The voltage sensor 142 and the current sensor 143 are sensors that detect the voltage and current of the power supplied to the power conditioner 10, and are provided in the output circuit 131.

In the power generation system 1 configured as described above, when the power generated by the power generation unit 22 is supplied to the power conditioner 10 via the switcher 120, the power conditioner 10 outputs power to the power system.

In some embodiments, the size of the power output from the solar power plant to the power grid is limited to the contract power contracted with the power company. This contracted power is, for example, 49.5 kw, for example, in a solar power plant linked to the voltage system at low pressure.
For example, in the solar power plant, when the installation number n of the power generation system 1 shown in FIG. 1 is 1, the upper limit value W _out -max of the power that can be output from the power conditioner 10 to the power system is the contract power Wcv. It becomes a value. Further, for example, in the solar power plant, as shown in FIG. 2, when the number n of installed power generation systems 1 is more than one, the upper limit value W _{out -max of the} power that can be output from each power conditioner 10 to the power system. Is a value (Wcv / n) obtained by dividing the contracted power Wcv by the number n of installed power generation systems 1.

Therefore, in some embodiments, the maximum value of DC power supplied to the power conditioner 10 with the power value W _in-max taking into consideration the conversion loss in the power conditioner 10 with respect to the upper limit value W _out -max Do. In the following description, the maximum value is referred to as a first predetermined value Sv1.
In addition, FIG. 2 is a figure explaining the case where multiple electric power generation systems 1 shown in FIG. 1 are installed in the solar power station which concerns on one Embodiment. Although the configuration of the solar cell group 20, the storage battery 110 and the switcher 120 is omitted in FIG. 2, the configuration of the solar cell group 20, the storage battery 110 and the switcher 120 in FIG. The configuration is the same as that of the storage battery 110 and the switcher 120.

Because the amount of electricity generated by solar cells depends on the amount of solar radiation, it decreases in the morning and evening and is susceptible to the weather. Therefore, in order to generate as much electric power as possible for a long time of day, a solar power plant is generally provided with a solar cell having a generation capacity exceeding the contracted amount of power.
Similarly, also in the power generation system 1 according to some embodiments, the power generation capacity of the solar cell group 20 provided corresponding to the power conditioner 10 exceeds the above-described first specified value. Therefore, for example, in a sunny daytime, the power generated by the solar cell group 20 exceeds the first specified value Sv1.

Therefore, in some embodiments, when the power generated by the solar cell group 20 exceeds the first predetermined value Sv1, the connection destination of the power generation unit 22 is a power conditioner by the operation of at least one switch element 124 of the switcher 120. By switching from 10 to the storage battery 110, the storage battery 110 stores surplus power. Moreover, in some embodiments, when it is not possible to expect power generation by sunlight, such as at night, the power stored in the storage battery 110 is supplied to the power conditioner 10 to supply power to the power system.

Hereinafter, the power adjustment method in the power generation system 1 according to some embodiments will be described. In the solar power plant, even if one power generation system 1 is installed as shown in FIG. 1, or even if a plurality of power generation systems 1 are installed as shown in FIG. The power adjustment method in each power generation system 1 is the same. Therefore, the following description will be made mainly with reference to FIG. 1 and FIG. 3 described later.

The power adjustment method according to some embodiments includes a switching step of switching the connection destination of each power generation unit 22 to either the power conditioner 10 or the storage battery 110 by the operation of the switch element 124 of each of the switchers 120. The details of this switching step are as follows.

In some embodiments, control circuit 141 controls each part of power conditioner 100 as follows. Hereinafter, the control contents performed by the control circuit 141 will be described with time.

(Before dawn)
In the time zone before dawn, since the solar radiation amount is zero or almost zero, the voltage of the generated power in each power generation unit 22 is lower than the minimum startup voltage of the power conditioner 10. In such a time zone, the control circuit 141 causes the storage battery 110 to be connected to all the power generation units 22 until a predetermined time t1 is reached based on the information on the time obtained from the built-in clock function. And outputs a control signal for operating the switch element 124 to the switcher 120. Thus, in the switcher 120, each of the input terminals 123 is connected to each of the second output terminals 122. Therefore, the connection destination of all the power generation units 22 is the storage battery 110.

In addition, time t1 is time when it can be expected to start the output to the electric power grid of the generated power by sunlight, for example.
The information of the time t1 is, for example, information of a time in which the latitude and longitude of the location of the solar power plant is considered, and is stored in a storage unit (not shown) of the control circuit 141. The information of the time t1 includes information of a plurality of times set according to the season. The control circuit 141 selects and acquires information of the suitable time t1 from among the information of the plurality of times t1 based on the information of the month and day obtained from the built-in calendar function.

(Time t1)
At time t1, the control circuit 141 outputs, to the switcher 120, a control signal for operating the switch element 124 so as to switch the connection destination of all the power generation units 22 to the power conditioner 10. Thus, in the switcher 120, each of the input terminals 123 is connected to each of the first output terminals 121. Therefore, the connection destination of all the power generation units 22 is used as the power conditioner 10.
In addition, as described later, when the power from storage battery 110 is supplied to power conditioner 10 at night and the power from storage battery 110 is supplied to power conditioner 10 even at time t1, control circuit 141 Before outputting the control signal to the switcher 120, the output permission unit 133 outputs the control signal for stopping the power supply from the storage battery 110 to the output device 114 of the storage battery 110 and opens the discharge circuit 132. Output control signal to Thus, the output device 114 stops the power supply from the storage battery 110 to the power conditioner 10, and the output permission unit 133 disconnects the storage battery 110 from the output circuit 131.

Thus, the control circuit 141 operates the switch element 124 of the switcher 120 such that the power from the plurality of power generation units 22 and the power from the storage battery 110 are alternatively input to the power conditioner 10, The open / close state of the output permission unit 133 is controlled.
That is, in some embodiments, the switcher 120 generates power by operating the at least one switch element 124 only when the output permission unit 133 prohibits the output of power from the storage battery 110 to the power conditioner 10. The connection destination of the unit 22 is configured to be switched to the power conditioner 10.

Note that regardless of whether time t1 is reached or not, it is detected that the voltage of the generated power in each power generation unit 22 exceeds the minimum start-up voltage of power conditioner 10 after time t0 at dawn. A control signal for operating the switch element 124 may be output to the switcher 120 so that the switch 141 switches the connection destination of all the power generation units 22 to the power conditioner 10. Note that time t0 is stored in a storage unit (not shown) of control circuit 141 as information of a plurality of times set according to the season, taking into account the latitude and longitude of the location of the solar power plant, as in the above time t1. It may be done.
Here, in some embodiments, the voltage of the power supplied from the plurality of power generation units 22 to the storage battery 110 is the minimum startup voltage of the power conditioner 10 by the detection function of the input voltage included in the charging device 113 of the storage battery 110. It is possible to detect that it has exceeded. That is, when the charging device 113 detects that the input voltage exceeds the minimum start-up voltage of the power conditioner 10, a signal notifying that the input voltage exceeds the minimum start-up voltage of the power conditioner 10 is sent to the control circuit 141. Output. Then, when the control circuit 141 receives the signal, the control circuit 141 outputs, to the switcher 120, a control signal for operating the switch element 124 so as to switch the connection destination of all the power generation units 22 to the power conditioner 10.
A voltage sensor may be separately provided to detect that the voltage of the generated power in each power generation unit 22 has exceeded the minimum start-up voltage of power conditioner 10.

In the following description, at time t1, the control circuit 141 outputs to the switcher 120 a control signal for operating the switch element 124 to switch the connection destination of all the power generation units 22 to the power conditioner 10. It explains as a premise.

(From time t1 to time t2)
The control circuit 141 performs the following control from time t1 to a predetermined time t2 after the evening. In addition, time t2 is time when it becomes impossible to expect, for example, to output power generated by sunlight to the power system. The time t2 is stored in a storage unit (not shown) of the control circuit 141 as information of a plurality of times set in accordance with the season after taking into consideration the latitude and longitude of the location of the solar power plant, for example. ing.
The control circuit 141 monitors the voltage and the magnitude of the power supplied from the solar cell group 20 to the power conditioner 10 based on the voltage and the current detected by the voltage sensor 142 and the current sensor 143.

(Until the power supplied to the power conditioner 10 exceeds the first specified value Sv1)
From time t1 until the power supplied from the solar cell group 20 to the power conditioner 10 exceeds the first specified value Sv1 described above, the control circuit 141 causes the power conditioner 10 to be connected to all the power generation units 22 and The control signal for operating the switch element 124 is output to the switcher 120 as follows.

(When the power supplied to the power conditioner 10 exceeds the first specified value Sv1)
When it is determined that the amount of solar radiation increases and the power supplied from the solar cell group 20 to the power conditioner 10 exceeds the first prescribed value Sv1 described above, the control circuit 141 causes the connection of one power generation unit 22 to be connected The control signal is output to the switcher 120 to operate the switch element 124 so as to switch the storage battery 110 to the storage battery 110. The control circuit 141 also outputs a control signal to the charging device 113 to start charging the storage battery cell group 112.

Thereby, as shown in FIG. 3, in the switcher 120, the input terminal 123 of one switch element 124 is connected to the second output terminal 122. Therefore, the power generated by one power generation unit 22 of the solar cell group 20 is supplied to the storage battery 110, and the power generated by the remaining power generation units 22 is supplied to the power conditioner 10. In storage battery 110, charging of storage battery cell group 112 with the power generated by power generation unit 22 is started. FIG. 3 is a diagram showing a state in which the input terminal 123 of one switch element 124 in the switcher 120 is connected to the second output terminal 122.

Note that the power supplied from the solar cell group 20 to the power conditioner 10 has the first specified value Sv1 in order to suppress excessive switching of the switch element 124 and repetition of excessive charging start and stop in the storage battery 110. The control circuit 141 may output the control signal when the exceeded state continues beyond a predetermined time. Even in cases other than this, when outputting a control signal for switching the connection destination in the switch element 124, or when outputting a control signal for switching the start and stop of charging / discharging of the charging device 113 of the storage battery 110 or the output device 114. The same is true for

Thus, in some embodiments, the switcher 120 operates the at least one switch element 124 when the power supplied from the plurality of power generation units 22 to the power conditioner 10 exceeds the first predetermined value Sv1. The connection destination of the power generation unit 22 is configured to be switched to the storage battery 110. Thereby, it is possible to effectively utilize the surplus power for the amount exceeding the first specified value Sv1 in the storage battery.

As described above, after switching the connection destination of one power generation unit 22 to storage battery 110, it is determined that the power supplied from solar cell group 20 to power conditioner 10 exceeds the first prescribed value Sv1 again. Then, the control circuit 141 outputs, to the switcher 120, a control signal for operating the switch element 124 so as to switch the connection destination of yet another power generation unit 22 to the storage battery 110. As a result, in the switcher 120, the input terminal 123 of yet another switch element 124 is connected to the second output terminal 122.

The control circuit 141 performs control of sequentially switching the connection destination of the power generation unit 22 to the storage battery 110 until the power supplied from the solar cell group 20 to the power conditioner 10 falls below the first specified value Sv1. By such control of the control circuit 141, the connection destination of the power generation unit 22 is switched to the storage battery 110 such that the power supplied to the power conditioner 10 becomes the largest within the range not exceeding the first specified value Sv1.

Even if power exceeding the first specified value Sv1 is supplied from the power generation unit 22 to the power conditioner 10, surplus power for the amount exceeding the first specified value Sv1 is released as heat by the power conditioner 10 As a result, surplus power can not be used effectively.
On the other hand, in some embodiments, the switcher 120 is connected to the power generation unit 22 such that the power supplied from the plurality of power generation units 22 to the power conditioner 10 does not exceed the first specified value Sv1. It is configured to change the number of switch elements 124 operated to switch to the storage battery 110. As a result, since the surplus power can be stored in the storage battery 110 instead of being released as heat by the power conditioner 10, the surplus power can be effectively used.

Further, in some embodiments, the switcher 120 is configured such that the power supplied from the plurality of power generation units 22 to the power conditioner 10 is the largest within a range not exceeding the first predetermined value Sv1. The number of switch elements 124 operated to switch the connection destination to the storage battery 110 is changed.
As a result, the power supplied to the power conditioner 10 increases in the range not exceeding the first specified value Sv1, and therefore, it is possible to suppress a decrease in the power output to the power system.

(When the generated power of the solar cell group 20 decreases)
As described above, after the connection destination of at least one power generation unit 22 is switched to the storage battery 110, the amount of solar radiation decreases, and it is determined that the power supplied to the power conditioner 10 falls below the second prescribed value Sv2. Then, the control circuit 141 outputs, to the switcher 120, a control signal for operating the switch element 124 so as to switch the connection destination of one power generation unit 22 to the power conditioner 10. Thereby, in the switcher 120, one switch element 124 whose input terminal 123 is connected to the first output terminal 121 is added. Therefore, the number of power generation units 22 that supply generated power to the power conditioner 10 is increased by one.
The second prescribed value Sv2 is, for example, the power value W _in-max described above, that is, the maximum value of DC power supplied to the power conditioner 10 divided by the number α of the power generation units 22 in the solar cell group 20 The value (W _in -max / α) is set to a value (Sv1- (W _in -max / α)) obtained by subtracting the first specified value Sv1.

As described above, after switching the connection destination of one power generation unit 22 to the power conditioner 10, it is determined again that the power supplied from the solar cell group 20 to the power conditioner 10 falls below the second prescribed value Sv2. Then, the control circuit 141 outputs, to the switcher 120, a control signal for operating the switch element 124 so as to switch the connection destination of yet another power generation unit 22 to the power conditioner 10. Thereby, in the switcher 120, the input terminal 123 of the further switch element 124 is connected to the first output terminal 121.

The control circuit 141 repeats control of sequentially switching the connection destination of the power generation unit 22 to the power conditioner 10 until the power supplied from the solar cell group 20 to the power conditioner 10 exceeds the second specified value Sv2. By such control of the control circuit 141, the connection destination of the power generation unit 22 is switched to the power conditioner 10 so that the power supplied to the power conditioner 10 becomes the largest within the range not exceeding the first specified value Sv1. Be

Thus, in some embodiments, the switcher 120 operates the at least one switch element 124 when the power supplied from the plurality of power generation units 22 to the power conditioner 10 exceeds the first predetermined value Sv1. After switching the connection destination of the power generation unit 22 to the storage battery 110, when the power supplied from the plurality of power generation units 22 to the power conditioner 10 falls below the second prescribed value Sv2, connection is performed by the operation of at least one switch element 124 The connection destination of the power generation unit 22 whose tip is the storage battery 110 is configured to be switched to the power conditioner 10.
Thereby, since the power supplied to the power conditioner 10 can be increased, the power to be output to the power system can be increased.

(When it falls below the minimum starting voltage of the power conditioner 10)
It is also conceivable that the amount of solar radiation decreases further, and the voltage of the power generated by the solar cell group 20 falls below the minimum startup voltage of the power conditioner 10. Here, as a case where the voltage of the electric power generated by the solar cell group 20 is lower than the minimum starting voltage of the power conditioner 10, for example, the case where the amount of solar radiation decreases due to the deterioration of the weather or the decrease of the solar altitude can be mentioned. .

If the voltage of the power generated by the solar cell group 20 is lower than the minimum start-up voltage of the power conditioner 10, the power generated by the solar cell group 20 can not be output from the power conditioner 10 to the power system. However, even in such a case, the storage battery 110 may be able to be charged by the power generated by the solar cell group 20.

Therefore, in some embodiments, when it is determined that the voltage of the power generated by the solar cell group 20 falls below the minimum start-up voltage of the power conditioner 10, the control circuit 141 determines the connection destination of all the power generation units 22. The control signal is output to the switcher 120 to operate the switch element 124 so as to switch the storage battery 110 to the storage battery 110. The control circuit 141 also outputs a control signal to the charging device 113 to start charging the storage battery cell group 112.

Thus, in the switcher 120, the input terminals 123 of all the switch elements 124 are connected to the second output terminal 122. Therefore, the power generated by all the power generation units 22 is supplied to storage battery 110. In storage battery 110, when storage battery cell group 112 can be charged by the power generated by power generation unit 22, charging of storage battery cell group 112 is started.

Thus, in some embodiments, the switcher 120 operates the switch element 124 when the voltage of the power supplied to the power conditioner 10 from the plurality of power generation units 22 falls below the minimum start-up voltage of the power conditioner 10. Thus, the connection destinations of all the power generation units 22 are configured to be switched to the storage battery 110.
Thereby, even if the voltage of the power supplied from the plurality of power generation units 22 to the power conditioner 10 falls below the minimum start-up voltage of the power conditioner 10, the storage battery 110 can be stored with the power from the power generation unit 22 . Thereby, the electric power generated by the power generation unit 22 can be effectively used.

After that, if, for example, the weather recovers and the amount of solar radiation increases and the voltage of the power supplied from the plurality of power generation units 22 to the storage battery 110 exceeds the minimum startup voltage of the power conditioner 10, the control circuit 141 A control signal for operating the switch element 124 is output to the switcher 120 so that the connection destination of all the power generation units 22 is switched to the power conditioner 10. The control circuit 141 also outputs a control signal to the charging device 113 so as to stop the charging of the storage battery cell group 112.

In some embodiments, as described above, the voltage of the power supplied from the plurality of power generation units 22 to the storage battery 110, that is, the solar cell group 20 is generated by the detection function of the input voltage of the charging device 113. It can be detected that the voltage of the power exceeds the minimum starting voltage of the power conditioner 10.
As described above, when the charging device 113 detects that the input voltage exceeds the minimum start-up voltage of the power conditioner 10, it controls a signal notifying that the input voltage exceeds the minimum start-up voltage of the power conditioner 10. It outputs to the circuit 141. Then, when the control circuit 141 receives the signal, the control circuit 141 outputs, to the switcher 120, a control signal for operating the switch element 124 so as to switch the connection destination of all the power generation units 22 to the power conditioner 10.

Thereby, in the switcher 120, the input terminals 123 of all the switch elements 124 are connected to the first output terminal 121. Therefore, the power generated by all the power generation units 22 is supplied to the power conditioner 10. Moreover, in the storage battery 110, charging of the storage battery cell group 112 is stopped.

Thus, in some embodiments, the switcher 120 operates the switch element 124 when the voltage of the power supplied to the power conditioner 10 from the plurality of power generation units 22 falls below the minimum start-up voltage of the power conditioner 10. Therefore, when the connection destination of all the power generation units 22 is switched to the storage battery 110 and thereafter the voltage of the power supplied from the plurality of power generation units 22 to the storage battery 110 exceeds the minimum startup voltage of the power conditioner 10, It is comprised so that the connection destination of all the electric power generation parts 22 may be switched to the power conditioner 10 by operation.
As a result, the amount of power supplied to the power conditioner 10 can be increased, and the amount of power output to the power system can be increased.

Further, in some embodiments, as described above, the switcher 120 operates the switch element 124 to set the connection destination of each power generation unit 22 according to the generated power of the plurality of power generation units 22 as the power conditioner 10 or It is configured to switch to any one of the storage batteries 110.
Thus, the connection destinations of the respective power generation units 22 are switched according to the generated power of the plurality of power generation units 22. For example, when the power supplied from the power generation unit 22 to the power conditioner 10 becomes large It becomes possible to switch the connection destination of the unit 22 to the storage battery 110 and store the storage battery 110 in it. Thereby, the surplus power can be effectively used with a simple circuit configuration.

(After time t2, until the next day t1)
At time t2, the control circuit 141 outputs, to the switcher 120, a control signal for operating the switch element 124 so as to switch the connection destination of all the power generation units 22 to the storage battery 110. Thus, in the switcher 120, each of the input terminals 123 is connected to each of the second output terminals 122. Therefore, the connection destination of all the power generation units 22 is the storage battery 110.
Further, the control circuit 141 outputs a control signal for starting the discharge from the storage battery 110 to the output device 114 of the storage battery 110, and outputs a control signal to the output permission unit 133 so as to close the discharge circuit 132. Thereby, the output device 114 starts the power supply from the storage battery 110 to the power conditioner 10, and the output permission unit 133 connects the storage battery 110 and the output circuit 131. Thereby, the power stored in storage battery 110 is supplied to power conditioner 10. Power conditioner 10 converts DC power from storage battery 110 into AC power and outputs the AC power to a power system.

Thus, the control circuit 141 operates the switch element 124 of the switcher 120 such that the power from the plurality of power generation units 22 and the power from the storage battery 110 are alternatively input to the power conditioner 10, The open / close state of the output permission unit 133 is controlled.
That is, in some embodiments, in the switcher 120, the output allowing unit 133 outputs power from the storage battery 110 only when the connection destinations of all the power generation units 22 are switched to the storage battery 110 by the operation of the switch element 124. It is configured to allow the output of power to the conditioner 10.

Thus, in some embodiments, the power from the plurality of power generation units 22 and the power from the storage battery 110 are alternatively input to the power conditioner 10 by the switcher 120 and the output permission unit 133. Thus, there is no need to provide a combining circuit that combines the power from the plurality of power generation units 22 and the power from the storage battery 110, so the circuit configuration in the power adjustment device 100 can be simplified.

Discharge from storage battery 110 is continued until the remaining charge of storage battery 110 (storage battery cell group 112) reaches a predetermined remaining charge, or until time t1 is reached.
That is, the output device 114 of the storage battery 110 monitors the remaining charge amount of the storage battery cell group 112 during discharge from the storage battery cell group 112. Then, when it is determined that the remaining charge amount has decreased to a predetermined remaining charge amount, the output device 114 stops the discharge from the storage battery cell group 112. In addition, the output device 114 outputs, to the control circuit 141, a signal notifying that the discharge from the storage battery cell group 112 has been stopped. When the control circuit 141 receives the signal, the control circuit 141 outputs a control signal to the output permitting unit 133 so as to open the discharge circuit 132. Thereby, the output permission unit 133 disconnects the storage battery 110 from the output circuit 131.
If time t1 is reached before the remaining charge amount of storage battery cell group 112 decreases to a predetermined remaining charge amount, control circuit 141 outputs a control signal for stopping discharge from storage battery 110 to output device 114 of storage battery 110 At the same time, a control signal is output to the output permission unit 133 so as to open the discharge circuit 132. Thus, the output device 114 stops the discharge from the storage battery cell group 112, and the output permission unit 133 disconnects the storage battery 110 from the output circuit 131.

As described above, the power adjustment device 100 according to some embodiments includes the storage battery 110 and the switcher 120. The switcher 120 is provided corresponding to the power conditioner 10 and has an input terminal 123 to which each of a plurality of power generation units 22 each including one or more solar battery cells is connected, and a first output connected to the power conditioner A plurality of switch elements 124 each having a terminal 121 and a second output terminal 122 connected to the storage battery 110 are included.
The switcher 120 is configured to be able to switch the connection destination of each power generation unit 22 to either the power conditioner 10 or the storage battery 110 by the operation of each switch element 124.
The power generation system 1 according to some embodiments is provided corresponding to the power conditioner 10 and the power conditioner 10, and includes a plurality of power generation units 22 each including one or more solar cells, and power adjustment And an apparatus 100.

Thus, the connection destination of each power generation unit 22 can be switched by the operation of the switch element 124 of the switcher 120, so switching of the power supply destination generated by each power generation unit 22 or power generation by each power generation unit 22 The distributed power can be realized by a simple circuit configuration. Therefore, by the operation of the switch element 124 of the switcher 120, for example, part of the electric power generated by each of the power generation units 22 can be supplied to the power conditioner 10 and the surplus can be stored in the storage battery 110. As a result, since it is not necessary to use a circuit for performing distribution and combination of power which tends to have a complicated circuit configuration, surplus power can be effectively used with a simple circuit configuration.

Moreover, the power adjustment method according to some embodiments includes an input terminal 123 provided corresponding to the power conditioner 10 and connected to each of the plurality of power generation units 22 each including one or more solar cells, With respect to the switcher 120 including a plurality of switch elements 124 each having the first output terminal 121 connected to the conditioner 10 and the second output terminal 122 connected to the storage battery 110, each power generation is performed by operation of each switch element 124. A switching step of switching the connection destination of the unit 22 to any one of the power conditioner 10 and the storage battery 110 is provided.
Thereby, the surplus power can be effectively used by simple control contents such as switching control of the switch element 124.

As shown in FIG. 2, in the solar power plant, when a plurality of power conditioners 10 are installed, a plurality of storage batteries 110 are provided corresponding to the plurality of power conditioners 10. The switcher 120 is also provided corresponding to the power conditioner 10. As described above, when a plurality of power conditioners 10 are installed in a solar power plant, a plurality of power adjustment devices 100 having a simple circuit configuration may be installed according to the number of installed power conditioners 10. Even when a plurality of conditioners 10 are installed, surplus power can be effectively used with a simple circuit configuration.

The power conditioner 100 according to some embodiments described above can be applied retrofit to existing solar power plants. Specifically, for example, the switcher 120 is interposed between the power conditioner 10 and the solar cell group 20 in the existing solar power plant. That is, each power generation unit 22 of the solar cell group 20 is connected to each of the input terminals 123 of the switcher 120. Then, the first output terminals 121 of the switcher 120 are connected to the input side of the power conditioner 10 via the output circuit 131, respectively.
Further, the second output terminals 122 of the switcher 120 are connected to the charging device 113 of the storage battery 110 respectively. Then, one end of the discharge circuit 132 provided with the output permitting unit 133 is connected to the output device 114 of the storage battery 110, and the other end is connected to the output circuit 131. The voltage sensor 142 and the current sensor 143 are installed in the output circuit 131. Note that instead of installing the voltage sensor 142 and the current sensor 143, information on the voltage and current of the input power to the power conditioner 10 may be acquired from the power conditioner 10.

In some embodiments, the first prescribed value Sv1 and the second prescribed value Sv2 may be changed by an instruction from the outside of the solar power plant. FIG. 5 is a diagram showing an example of an embodiment in which the first predetermined value Sv1 and the second predetermined value Sv2 can be changed by an instruction from the outside of the solar power plant.
In FIG. 5, a server 90 is installed outside the solar power plant. The server 90 is configured to be able to output a change instruction for changing the first predetermined value Sv1 or the second predetermined value Sv2. The change instruction includes at least information on values of the first predetermined value Sv1 and the second predetermined value Sv2 after the change. Note that the change instruction includes the date and time information for changing the values of the first predetermined value Sv1 and the second predetermined value Sv2, and the original values of the first predetermined value Sv1 and the second predetermined value Sv2 after the change. It may include date and time information etc.

Information transfer between the control circuit 141 of the power adjustment apparatus 100 and the server 90 is performed via, for example, a communication network 91 including a telephone line, the Internet, and the like.
The control circuit 141 is configured to be able to change the first predetermined value Sv1 and the second predetermined value Sv2 based on the received change instruction.

When the control circuit 141 receives the change command output from the server 90, the control circuit 141 changes the value of the first predetermined value Sv1 or the second predetermined value Sv2 included in the change command based on the received change command. The value is updated to the value of the specified value Sv1 or the second specified value Sv2. Information on the date and time when the values of the first prescribed value Sv1 and the second prescribed value Sv2 are changed to the change instruction, and the values of the first prescribed value Sv1 and the second prescribed value Sv2 are returned to the original values When the date and time information is included, the control circuit 141 changes the values of the first predetermined value Sv1 and the second predetermined value Sv2 or restores the original values based on the information.

In some embodiments, as described above, the power output to the power system can be easily generated by configuring the first specified value Sv1 and the second specified value Sv2 to be able to be changed by an instruction from the outside of the solar power plant. Can be suppressed or released.
Thus, for example, even if the power company managing the electric power system requests the suppression of the generated power from the solar power plant, it can be coped with by the remote control by the server 90. And, even if it is necessary to suppress the power output to the power system as described above, since the surplus power can be stored in the storage battery 110, the surplus power can be effectively used.

The present invention is not limited to the above-described embodiments, and includes the embodiments in which the above-described embodiments are modified, and the embodiments in which these embodiments are appropriately combined.
For example, in the solar power plant according to the embodiment shown in FIG. 2, the number n of installed power generation systems 1 is plural, and the storage batteries 110 are respectively provided in the respective power generation systems 1. However, as in the solar power plant according to the other embodiment shown in FIG. 4, although the number n of power generation systems 1A installed is plural, the number of storage batteries 110 installed may be one. FIG. 4 is a diagram showing the overall configuration of a solar power plant according to another embodiment.
That is, in the other embodiment shown in FIG. 4, one storage battery 110 is configured to be able to supply power to a plurality of power conditioners 10. In the configuration of the other embodiment shown in FIG. 4, the number of storage batteries 110 can be suppressed to suppress cost increase.
Note that the power generation system 1A of the solar power plant according to the other embodiment shown in FIG. 4 has some embodiments described above except that one storage battery 110 is installed for a plurality of power generation systems 1A. It has the same configuration as the power generation system 1 according to.
Although not shown, the number n of installed power generation systems 1A may be more than one, and the number of storage batteries 110 installed may be less than the number n installed of power generation systems 1A.

In some embodiments described above, the power generation unit 22 includes a plurality of solar cell modules 21 connected in series. However, the number of solar cell modules 21 included in the power generation unit 22 may be one.

In some embodiments described above, voltage sensor 142 and current sensor 143 are provided in output circuit 131. However, at least one of the voltage sensor 142 and the current sensor 143 may be a sensor (not shown) provided in the power conditioner 10 to detect the voltage or current of the power supplied to the power conditioner 10.

DESCRIPTION OF SYMBOLS 1 Power generation system 10 Power conditioner 20 Solar cell group 22 Power generation part (string)
DESCRIPTION OF SYMBOLS 100 Power conditioning apparatus 110 Storage battery 111 Storage battery cell 112 Storage battery cell group 120 Switcher 121 1st output terminal 122 2nd output terminal 123 Input terminal 124 Switch element 131 Output circuit 132 Discharge circuit 133 Output permission part 141 Control circuit 142 Voltage sensor 143 Current sensor

Claims

A storage battery,
An input terminal provided corresponding to the power conditioner and connected to each of a plurality of power generation units including one or more solar battery cells, a first output terminal connected to the power conditioner, and the storage battery A switcher including a plurality of switch elements having a second output terminal connected to the
The power conditioner for a solar power station, wherein the switcher is configured to be able to switch the connection destination of each of the power generation units to either the power conditioner or the storage battery by operating each of the switch elements.
An output circuit provided between the first output terminal and the power conditioner;
A discharge circuit provided between the storage battery and the power conditioner;
The power adjustment for a solar power plant according to claim 1, wherein the discharge circuit is directly connected to the output circuit without passing through a combination circuit that combines the power from the plurality of power generation units and the power from the storage battery. apparatus.
And an output permission unit that permits or prohibits the output of power from the storage battery to the power conditioner,
The switcher operates the at least one switch element to switch the connection destination of the power generation unit to the power condition only when the output permission unit prohibits the output of power from the storage battery to the power conditioner. Configured to switch to the
The output permission unit outputs the power from the storage battery to the power conditioner only when the connection destinations of all the power generation units are switched to the storage battery by the operation of the switch element in the switcher. A power conditioner for a solar power plant according to claim 1 or 2, configured to allow.
The switcher is configured to switch the connection destination of each power generation unit to either the power conditioner or the storage battery according to the generated power of the plurality of power generation units by the operation of the switch element. A power conditioner for a solar power plant according to any of the preceding claims.
The switcher switches the connection destination of the power generation unit to the storage battery by operation of at least one of the switch elements when the power supplied from the plurality of power generation units to the power conditioner exceeds a first specified value. A power conditioning device for a solar power plant according to any of the preceding claims, configured in
The switcher operates the number of switch elements to switch the connection destination of the power generation unit to the storage battery such that the power supplied from the plurality of power generation units to the power conditioner does not exceed a first specified value. 6. A power conditioning unit for a solar power plant according to any of the preceding claims, configured to change.
The switcher operates to switch the connection destination of the power generation unit to the storage battery such that the power supplied from the plurality of power generation units to the power conditioner is the largest within the range not exceeding the first specified value. 7. A power conditioner for a solar power plant according to any one of the preceding claims, configured to change the number of said switching elements.
The switcher switches the connection destination of the power generation unit to the storage battery by operation of at least one of the switch elements when the power supplied from the plurality of power generation units to the power conditioner exceeds a first specified value. After that, when the power supplied from the plurality of power generation units to the power conditioner falls below the second specified value, the connection destination is the storage battery whose connection destination is the storage battery by the operation of at least one of the switch elements. A power conditioner for a solar power plant according to any of the preceding claims, configured to switch the power conditioner to the power conditioner.
When the voltage of the power supplied from the plurality of power generation units to the power conditioner falls below the minimum start-up voltage of the power conditioner, the switcher operates the switch element to connect the connection destinations of all the power generation units. A power conditioner for a solar power plant according to any of the preceding claims, configured to switch to the storage battery.
When the voltage of the power supplied from the plurality of power generation units to the power conditioner falls below the minimum start-up voltage of the power conditioner, the switcher operates the switch element to connect the connection destinations of all the power generation units. When the voltage of the power supplied from the plurality of power generation units to the storage battery exceeds the minimum starting voltage of the power conditioner, the switch element is operated to switch the connection destination of all the power generation units. 10. A power conditioner for a solar power plant according to any of the preceding claims, configured to switch the power conditioner to the power conditioner.
The storage battery has a storage battery cell group in which a plurality of storage battery cells are connected,
The power conditioning device for a solar power plant according to any one of claims 1 to 10, wherein an output voltage of the storage battery cell group is within a range of applicable voltages on the input side of the power conditioner.
The power conditioning device for a solar power plant according to any one of claims 1 to 11, wherein the number of the storage battery is one, and power can be supplied to a plurality of the power conditioners.
The power conditioning device for a solar power plant according to any one of claims 1 to 11, wherein a plurality of the storage batteries are provided corresponding to a plurality of the power conditioners.
Power conditioner,
A plurality of power generation units provided corresponding to the power conditioner, each including one or more solar cells;
A power conditioner for a solar power plant according to any one of the preceding claims.
Power generation system equipped with
An input terminal connected to each of a plurality of power generation units provided corresponding to the power conditioner and including one or more solar battery cells, a first output terminal connected to the power conditioner, and a storage battery Switching step of switching the connection destination of each power generation unit to either the power conditioner or the storage battery by operating each of the switch elements for a switcher including a plurality of switch elements having the second output terminal to be connected Power adjustment method for a solar power plant comprising: