JPH05328633A - Solar power generator - Google Patents

Abstract

PURPOSE:To reduce the production cost of a solar power generator by providing a battery for absorbing the output change of solar cells, a second inverter for converting the DC power of the battery to AC power, and a controller for controlling the output power from the second inverter. CONSTITUTION:A plurality of commercial power sources 6 are connected to the output side of an inverter 3a via a feeder breaker 8. A battery 2 is connected to the input side of an inverter 3b for converting DC power to AC power via a shunt device 5. Then the output side of the inverter 3b is connected to the output side of the inverter 3a via the breaker 8. A controller 4 is given information on measurement of charging current of the battery via the device 5 and information on the output power of the sources 6 outputted from a power converter 9. Further the controller 4 is given the information on the number of operating sources 6 and on the intensity of solar insulation from an actinometer 12. The controller 4 controls the output power of the inverter 3b based on the information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photovoltaic power generator which is connected to a commercial power grid such as a diesel power grid composed of a plurality of diesel generator groups.

[0002]

2. Description of the Related Art FIG. 4 shows, for example, JP-A-1-152929.
FIG. 1 is a configuration diagram of a conventional grid-connected photovoltaic power generation device disclosed in Japanese Patent Publication No. In the figure, 1 is a solar cell, and this solar cell 1 is connected to the input side of an inverter 3 via a series circuit of a diode 13 and a shunt 5A.

Reference numeral 2 is a battery provided to absorb the output fluctuation of the solar cell 1 due to the fluctuation of solar radiation by its charge / discharge power. This battery 2 is a shunt 5B
Is connected to the input side of the inverter 3 via. In the inverter 3, the DC power supplied from the solar cell 1 and the battery 2 is converted into AC power. A load 7A is connected to the output side of the inverter 3. The output side of the inverter 3 is connected to the power supply (commercial power supply) 6 of the existing commercial power system via the feeder breaker 8A. A load 7B is connected to the commercial power source 6 via a feeder breaker 8B.

A controller 4 controls the output power of the inverter 3. Output information of the solar cell 1 detected by the shunt 5A is supplied to the control device 4, and
Measurement information of the charging / discharging current of the battery 2 is supplied from the shunt 5B. Reference numeral 9 is a power converter that detects the output power of the commercial power supply 6. The output power information of the commercial power supply 6 output from the power converter 9 is supplied to the transmitter 10. Information on the number of operating commercial power sources 6 is also supplied to the transmitter 10. Then, the transmitter 10 transmits the output power information of the commercial power source 6 and the operating vehicle number information to the receiver 11.
In the receiver 11, the transmitted information is converted into an electric signal and supplied to the control device 4.

In FIG. 5, the inverter 3 is controlled by the controller 4.
FIG. 6 is a control flow chart showing an example of a control method for controlling the output power of the above. In the figure, Pref is the inverter output command value, Ps is the solar cell output, ΔT is the sampling period, and Tc
1, Tc2 is the time constant, Fa is the correction factor, PG is the commercial power output,
PGH is an additional start set value of the commercial power output, PGL is a reduction stop set value of the commercial power output, and ΔP is a control width. Also, T
1 = ΔT / Tc1, T2 = ΔT / Tc2, PHL = PGH- △
P and PLL = PGL + ΔP.

First, Pref = Pref = 0 is set (step 101). Next, ΔPref = (Ps−Pref) ×
T1, Pref = Pref × ΔPref, Pref = Pref ×
Pref is calculated as Fa (steps 102 to 10).
4). Next, it is determined whether PG ≧ PHL (step 105). When PG ≧ PHL, after initial setting of PGref (step 106), ΔPGref = (PG−
PHL) × T2, PGref = PGref + ΔPGref, Pref = Pre
The inverter output command value Pref is calculated as f + PGref (steps 107 to 109). Then, it is determined whether or not ΔT has passed (step 110), and when ΔT has passed, the process returns to step 102.

If PG ≧ PHL is not satisfied in step 105, it is determined whether PG ≦ PLL is satisfied (step 111). When PG≤PLL, after initial setting of PGref (step 112), ΔPGref = (PLL-P
G) × T2 (step 113), the process proceeds to step 108, and the inverter output command value Pref is calculated. on the other hand,
If PG≤PLL is not satisfied in step 111, Pref = Pre
As f, the process proceeds to step 110.

The conventional photovoltaic power generator is constructed as described above, and when the commercial power source 6 is relatively small and not so large in capacity as the inverter 3, the inverter 3
In order to avoid the influence of system disturbance (voltage and frequency fluctuation) due to the output fluctuation of (1), the output of the inverter 3 is gently controlled by the control device 4 even if the output of the solar cell 1 changes due to solar radiation fluctuation.

At this time, the difference between the output of the solar cell 1 and the input power corresponding to the output power of the inverter 3 is compensated by the charge / discharge power of the battery 2. Therefore, due to the battery capacity, the output power of the inverter 3 (actually, output power = input power × inverter efficiency, but in order to simplify the description, the inverter efficiency is set to 100% and output power = input In general, the method of controlling (using electric power) so as to follow the output power of the solar cell 1 is average because the battery capacity does not increase so much.

Next, an example of a method of controlling the above-mentioned solar power generation device will be described with reference to FIGS. 4 and 5. The output of the solar cell 1 is detected by the shunt 5A, and in FIG. 5, the deviation between the solar cell output Ps and the inverter output command value Pref is integrated with the time constant Tc1 to control Pref.

Further, the charging / discharging current of the battery 2 is constantly measured by the shunt 5B, and the current-time product, that is, the Ah amount is calculated within the control device 4 at regular time intervals, and the amount of electricity (Ah amount) held in the battery 2 is calculated. ) Is measured. This Ah
When the amount is above the predetermined management level, the correction factor Fa is controlled to a level of discharge (large Fa) and to below the management level to a level of charging (small Fa).

By controlling in this way, the output power of the inverter 3 is controlled so as to gently follow the output of the solar cell 1 with a time constant Tc1 on average, and the output power of the battery 2 is Ah.
Since the amount is controlled so as to be equal to a predetermined management level on average, even if the battery capacity is relatively small, the output fluctuation of the inverter 3 does not occur even if the battery 2 is not overcharged or overdischarged. It is possible to avoid systematic disturbances that accompany it.

On the other hand, the power generation efficiency of the commercial power source 6 is generally influenced by the load factor, and particularly in the case of a diesel generator, the fuel efficiency is extremely lowered due to the reduction of the load factor. Therefore, multiple generators are used and loads 7A, 7B
Depending on the time of day and the seasonal fluctuation of the required power PL, the next machine is additionally started when the load factor exceeds the specified value, and conversely it decreases and stops when it falls below the specified value. Is generally done. In the unlikely event that the control of the number of operating machines cannot keep up with the sudden increase in load power and the generator becomes overloaded, a part of the feeder breakers 8A and 8B is temporarily selected according to a predetermined priority order. Cut off,
Avoidance of generator overload is performed.

Therefore, a solar power generator having a relatively large capacity with respect to the commercial power supply capacity is connected to such a system, and the output of the inverter 3 is averaged by the above control regardless of the operating condition of the commercial power supply 6. When the output of the inverter 3 is controlled to follow the output of the solar cell, the load factor of the commercial power source 6 decreases and the frequency of controlling the number of operating units increases, which causes disadvantages. Therefore, in addition to the above control, the following output control according to the operating status of the commercial power supply 6 is performed.

The output power PG and the operating capacity of the commercial power source 6 are transmitted to the control device 4 via the transmitter 10 and the receiver 11. The control device 4 can know the additional start set value PGH and the reduction stop set value PGL of the commercial power output preset for each operating capacity from the operation information of the commercial power supply 6.

Therefore, in FIG. 5, the level PHL (PHL = PGH-ΔP) at which the commercial power source 6 is not additionally activated and is lower than the additional activation set value PGH by the specified control width ΔP is compared with the commercial power source output PG. If PG ≧ PHL, the deviation (PG-PHL) is integrated with the time constant Tc2,
The inverter output command value Pref is controlled so as to increase by PGref from the command value Pref according to the solar radiation tracking described above. As a result, the required power PL of the loads 7A and 7B is temporarily
Is increased or the solar cell output Ps is decreased, the commercial power output PG is maintained at the level PHL or less.
Is not activated and the load factor is maintained high.

Further, a comparison is made between the commercial power supply output PG and a level PLL (PLL = PGL + ΔP) at which the commercial power supply 6 is not reduced and stopped by a specified control width ΔP higher than the commercial power supply output reduction stop set value PGL. If PG≤PLL, the deviation (PLL-PG) is integrated with a time constant Tc2, and the inverter output command value Pref is controlled so as to decrease from Pref by PGref. As a result, the loads 7A and 7
Even if the required power PL of B is decreased or the solar cell output Ps is increased, the commercial power supply output PG is maintained at the level PLL or more, so the commercial power supply 6 is not reduced and stopped, and the above control when PG ≧ PHL is also performed. Thus, it is possible to prevent an increase in the frequency of controlling the number of operating commercial power sources 6 during the solar radiation follow-up control.

Although not shown in the control flow of FIG. 5, when the Ah amount of the battery 2 is below a specified value or the inverter output is above a specified value during the control of PG ≧ PHL, and when PG ≦ PLL. Ah of battery 2 during control
When the amount is equal to or greater than the specified value or the inverter output is equal to or less than the specified value, the above control is stopped and the solar radiation follow-up control is resumed.

[0019]

Since the conventional photovoltaic power generation device is constructed as described above, the inverter is selected according to the operating condition of the commercial power source 6, especially when the capacity is larger than that of the commercial power source 6. It is necessary to perform output control of No. 3, and there are the following problems.

(1) It is necessary to transmit the operating information such as the output of the commercial power source 6 and the operating capacity to the solar power generation device side, and the existing power plant (commercial power source) and the solar power generation device have a relatively long distance. In such a case, an information transmission device using a telephone line or a wireless device is required between the transmitter 10 and the receiver 11, which increases the cost of the device.

(2) When the capacity of the solar power generators is relatively large and it is not possible to centrally arrange them in one place due to the site area, many small-capacity solar power generators are distributed and connected to the same system. It is conceivable that the above information transmission device will be required between each photovoltaic power plant and the existing power plant (commercial power source) unless the photovoltaic power plants are extremely short distances. However, the output control according to the operating condition of the commercial power source 6 is difficult to realize.

The present invention has been made in order to solve the above-mentioned problems, and responds to the operating conditions of the commercial power source such as mitigating the output fluctuation of the commercial power source due to the output fluctuation of the solar cell and improving the load factor. An object of the present invention is to provide a photovoltaic power generation device that can control output and can be inexpensively configured even when the photovoltaic power generation unit and a commercial power source are relatively long distances or even when a large number of solar cells are dispersed.

[0023]

According to a first aspect of the present invention, there is provided a solar power generation device comprising a solar cell and a solar power generation unit including a first inverter for converting DC power of the solar cell into AC power. A battery that connects the solar power generation unit to a commercial power system and absorbs fluctuations in the output of the solar cell near the power source side of the commercial power system; and a second inverter that converts the DC power of the battery into AC power. A control device for controlling the output power of the second inverter is provided.

A solar power generation device according to a second aspect of the present invention includes a solar power generation unit including a solar cell and a first inverter for converting DC power of the solar cell into AC power.
This solar power generation unit is connected to a commercial power system, a battery that absorbs fluctuations in the output of the solar cell near the power supply side of the commercial power system, a second inverter that converts the DC power of this battery into AC power, and A control device for controlling the output power of the second inverter is provided, information on the solar radiation intensity or the solar cell output is input to the control device, and the output power of the second inverter is controlled based on this input information.

A solar power generation device according to a third aspect of the present invention includes a solar power generation unit including a solar cell and a first inverter for converting DC power of the solar cell into AC power.
This solar power generation unit is connected to a commercial power system, a battery that absorbs fluctuations in the output of the solar cell near the power supply side of the commercial power system, a second inverter that converts the DC power of this battery into AC power, and A control device for controlling the output power of the second inverter is provided, information of the output power and operating capacity of the commercial power system is input to the control device, and the output power of the second inverter is controlled based on this input information. Is.

[0026]

According to the first aspect of the present invention, the solar power generation section side is not provided with a battery for absorbing the output fluctuation of the solar cell or an inverter for converting the DC power of the battery into AC power, Is installed near the power source side of the commercial power system, it is not necessary to provide an information transmission device using a telephone line or a wireless device for transmitting operation information of the power source of the commercial power system, for example. Further, when the solar cells are dispersedly arranged, it suffices to collectively install batteries having a capacity capable of absorbing the output fluctuations thereof. As a result, the cost can be reduced more than ever before.

According to the second aspect of the invention, in addition to the same operation as that of the first aspect of the invention, the output power of the inverter is controlled based on the input information of the solar radiation intensity or the solar cell output. It is possible to control the output fluctuation of the power source of the commercial power system due to the fluctuation of the electric power or the output of the solar cell.

According to the invention of claim 3, in addition to the same operation as the invention of claim 1, the output power of the inverter is controlled based on the input information of the output power and the operating capacity of the commercial power system. Therefore, it is possible to perform control according to operating conditions such as improvement of the load factor of the power source of the commercial power system.

[0029]

EXAMPLES Example 1. FIG. 1 is a block diagram showing an embodiment of the present invention. In this figure, parts corresponding to those in FIG. 4 are designated by the same reference numerals. In the figure, reference numeral 1 denotes a plurality of solar cells which are arranged in a distributed manner. Each of these solar cells 1 is connected to the input side of an inverter 3a that converts DC power into AC power.

A load 7 is connected to the output side of the plurality of inverters 3a. A plurality of commercial power supplies 6 are connected to the output side of these inverters 3a via feeder breakers 8.

Reference numeral 2 denotes a battery provided to absorb the output fluctuation of the solar cell 1 due to the fluctuation of solar radiation by its charge / discharge power. This battery 2 is connected via a shunt 5 to the input side of an inverter 3b that converts DC power into AC power. Then, the output side of the inverter 3b is connected to the output side of the inverter 3a via the feeder breaker 8.

A control device 4 controls the output power of the inverter 3b. The control device 4 is supplied with measurement information of the charging / discharging current of the battery 2 from the shunt 5. Reference numeral 9 is a power converter that detects the output power PG of the commercial power supply 6. Commercial power supply 6 output from this power converter 9
The output power information of the above is supplied to the control device 4. Further, the control device 4 is supplied with the information on the number of operating commercial power sources 6 and the solar radiation intensity information from the pyranometer 12. The control device 4 controls the output power of the inverter 3b based on these pieces of information. The battery 2, the inverter 3b, the control device 4, the shunt 5, the power converter 9, and the pyranometer 12 are installed at the commercial power source (existing power plant) 6 side or at a position closest thereto.

In FIG. 2, the inverter 3 is controlled by the control device 4.
FIG. 6 is a control flow chart showing an example of a control method for controlling the output power of the above. In the figure, PBref is the battery charge / discharge power command value, PB is the battery charge / discharge power (positive value is charging, negative value is discharging), Eng is the solar radiation intensity, Ks is the output constant, Fb is the battery charging rate, and ΔT is the sampling. Period, Tc1, Tc2
Is a time constant, PG is a commercial power output, PGH is a commercial power output additional start set value, PGL is a commercial power output reduction stop set value, and ΔP is a control width. Also, T1 = ΔT / Tc1, T2
= ΔT / Tc2, PHL = PGH-ΔP, and PLL = PGL + ΔP.

First, PBref = 0, PGref = PGref = P
Set to G (step 201). Next, PGS = PG-P
B + Eng × Ks × Fb, ΔPGref = (PGS−PGref)
× T1, PGref = PGref + ΔPGref as PGref
Is calculated (steps 202 to 204). Next, PG
It is determined whether ≧ PHL (step 205). P
When G ≧ PHL, after initial setting of PGref (step 206), ΔPGref = (PG−PHL) × T
2, PGref = PGref + ΔPGref, PGref = PGref
The battery charge / discharge power command value PBref is calculated as -PGref, PBref = PBref + (PGref-PG) (steps 207 to 210). Then, it is judged whether or not ΔT has passed (step 211), and when ΔT has passed, the process returns to step 202.

If PG ≧ PHL is not satisfied in step 205, it is determined whether PG ≦ PLL is satisfied (step 212). When PG ≦ PLL, after initial setting of PGref (step 213), ΔPGref = (PLL−
PG) × T2 (step 214), step 208
Then, the battery charge / discharge power command value PBref is calculated. On the other hand, when PG ≦ PLL is not satisfied in step 212,
Set PGref = PGref (step 215) and proceed to step 210.

Next, the control operation of this example will be described with reference to FIGS. In FIG. 1, the total output of the solar cells arranged in a distributed manner is Ps (Ps = Ps11 + ... + Ps1m + Ps2
1＋ ・ ・ ・ ＋ Ps2m), total load power is PL (PL = PL1)
1 + ... + PL1m + PL1n + PL21 + ... + PL2m + PL
2n) and the charging / discharging power of the battery 2 is PB (the charging side has a positive value and the discharging side has a negative value), the output power PG of the commercial power supply 6 can be expressed by the following equation (1).

PG = PL-Ps + PB (1)

Therefore, if the charging / discharging power PB of the battery 2 is controlled according to the fluctuations of PL and Ps from the equation (1), fluctuations of the commercial power supply output PG can be alleviated.

Further, if the charging / discharging power PB of the battery 2 is controlled so that the commercial power supply output PG averagely becomes PGS of the following formula (2), PB = P from the formulas (1) and (2).
s × Fb (Fb is the battery charge rate), and Ps × Fb of the solar cell output Ps is charged in the battery 2 on average.

PGS = PL−Ps × (1-Fb) (2)

However, since PL and Ps cannot be obtained directly, PGS is obtained as follows in this example.
That is, from the equation (1), PL = PG + Ps-PB, and by substituting this into the equation (2), the following equation (3) is obtained.

PGS = PG-PB + Ps × Fb (3)

As is well known, since the solar cell output Ps is almost proportional to the solar radiation intensity Eng and the solar cell capacity, the output constant Ks should be set in advance according to the total amount of solar cells connected to the commercial power source 6. By measuring the solar radiation intensity Eng, the solar cell output Ps can be estimated as Ps≈Eng × Ks. The measurement error of the solar cell output Ps based on the above does not hinder the effect of the present invention.

Therefore, the PGS of the above equation (3) can be substituted by the following equation (4).

PGS = PG−PB + Eng × Ks × Fb (4)

The power converter 9 detects the commercial power output PG, the shunt 5 detects the battery charging / discharging power PB, and the pyranometer 12 detects the solar radiation intensity Eng. The control unit 4 detects these detection outputs and sets them in advance. From the output constant Ks and the battery charging rate Fb, PGS can be obtained by the above equation (4).

In S1 of FIG. 2, the deviation between PGS and the commercial power supply output reference value PGref is integrated with a time constant Tc1,
Control PGref. Although not shown in FIG. 2, the amount of electricity (Ah amount) possessed by the battery 2 is measured and
When the amount of h is equal to or higher than a predetermined management level, the battery charging rate Fb is controlled to a slightly discharge limit (Fb small), and to a charge level (Fb large) below the management level.

When the commercial power output PG is PHL>PG> PLL, PGref = PGref in S2 of FIG.
In S3, the commercial power supply output PG is PGref (= PGref)
Battery charge / discharge power command value PBref,
Therefore, the battery charge / discharge power PB is controlled. That is, if the commercial power output PG is increased from the PGref by ΔPG, the battery charge / discharge power command value PBref is decreased by ΔPG, and conversely, if the commercial power output PG is decreased from the PGref by ΔPG, the battery charge / discharge power command is decreased. By increasing the value PBref by ΔPG, PG = PGref (PGref)
To control.

As a result, as shown in FIG. 3, even if PL or Ps suddenly changes, PL or P can be changed by the above operation.
The sudden change in power of s is absorbed by the change in charge / discharge power PB of the battery 2, and PGref, and thus the commercial power supply output PG, is gently controlled to change with a time constant Tc1. Also, on average, the battery charge / discharge power PB is PB = Eng × Ks × Fb≈
It can be controlled to Ps × Fb, and a part of the solar cell output in the daytime can be stored in the battery 2 as needed.

Further, in S2 of FIG. 2, PG ≧ PHL
In the case of, the deviation (PG-PHL) is calculated as the time constant Tc2 (Tc2
<Tc1) and integrate PGref from PGref to P
Control in the direction of decreasing by Gref (= PG-PHL),
When PG ≦ PLL, the deviation (PLL-PG) is calculated as the time constant T.
Integrate with c2, PGref from PGref (PGref (=
(PLL-PG) The control is performed in the direction of increasing the amount.

As a result, in S3 of FIG. 2, the commercial power output PG is either PHL (when PG ≧ PHL) or PLL (PG ≦).
Battery charge / discharge power P
B is controlled, and output control is performed according to the operating status of the commercial power source, such as load factor improvement, as in the conventional device.

Although not shown in FIG. 2, PG ≧
When the Ah amount of the battery 2 is below the specified value or the discharge power of the battery 2 is above the specified value during PHL control,
When the Ah amount of the battery 2 is equal to or higher than the specified value or the charging power of the battery 2 is equal to or higher than the specified value during the control of PG ≦ PLL, the above control is stopped and PG = PGref
= Return to control of PGS.

Example 2. In the above embodiment, the output constant K depends on the total amount of solar cells connected to the commercial power source 6.
s is determined, and the total sum Ps of the solar cell outputs is estimated by Ps ≈ Eng × Ks by measuring the solar radiation intensity Eng. However, since the solar cell output decreases in proportion to the temperature of the solar cell 1, the solar radiation intensity is If the temperature is measured in addition to the measurement of Eng and the output constant Ks is corrected and controlled by the temperature, the total Ps can be estimated more accurately.

When the control device 4 and the solar cell 1 installed at the closest position to the control device 4 have a relatively short distance, instead of measuring the solar radiation intensity Eng, the output of the solar cell 1 is changed. (For example, Ps11) is measured and Ps = Ps11 × Qs / Qs1
1 (Qs11 is the capacity of the measured solar cell, Qs is the total amount of solar cells connected to the grid) and Ps may be estimated.

[0055]

According to the first aspect of the present invention, a solar power generation unit including a solar cell and a first inverter for converting DC power of the solar cell into AC power is provided. A battery that is connected to the commercial power system and absorbs the output fluctuation of the solar cell in the vicinity of the power supply side of the commercial power system, a second inverter that converts the DC power of this battery into AC power, and the output of this second inverter Since the control device for controlling the electric power is provided, for example, an information transmission device using a telephone line or a wireless device for transmitting the operation information of the power source of the commercial power system to the control device becomes unnecessary. Further, when the solar cells are dispersedly arranged, it suffices to collectively install batteries having a capacity capable of absorbing the output fluctuations thereof. Therefore, there is an effect that it can be constructed at a lower cost than conventional ones.

According to the second aspect of the present invention, a solar power generation unit including a solar cell and a first inverter for converting DC power of the solar cell into AC power is provided, and the solar power generation unit is used as commercial power. A battery that is connected to the grid and absorbs the output fluctuation of the solar cell near the power supply side of the commercial power grid, a second inverter that converts the DC power of this battery into AC power, and the output power of this second inverter. A control device for controlling is provided, information of solar radiation intensity or solar cell output is input to the control device, and the output power of the second inverter is controlled based on this input information. Therefore, similar to the invention of claim 1, In addition to being able to obtain the effect, the output power of the inverter is controlled based on the solar radiation intensity or the input information of the solar cell output, so the output of the commercial power supply accompanying the fluctuation of the load power or the solar cell output. There is an effect that can be controlled in a direction to relax the dynamic.

According to the third aspect of the present invention, a solar power generation unit including a solar cell and a first inverter for converting DC power of the solar cell into AC power is provided, and the solar power generation unit is used for commercial power. A battery that is connected to the grid and absorbs the output fluctuation of the solar cell near the power supply side of the commercial power grid, a second inverter that converts the DC power of this battery into AC power, and the output power of this second inverter. A control device for controlling is provided, and information on the output power and operating capacity of the commercial power system is input to the control device, and the output power of the second inverter is controlled based on this input information.
In addition to being able to obtain the same effects as the invention described in the paragraph, since the output power of the inverter is controlled based on the input information of the output power of the commercial power system and the operating capacity, it is possible to improve the load factor of the power source of the commercial power system. There is an effect that the control can be performed according to the driving situation.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a solar power generation device according to the present invention.

FIG. 2 is a flow chart for explaining control in one embodiment of the present invention.

FIG. 3 is a diagram showing a control situation according to an embodiment of the present invention.

FIG. 4 is a configuration diagram showing a conventional solar power generation device.

5 is a flow chart for explaining control in the example of FIG.

[Explanation of symbols]

 1 Solar cell 2 Battery 3a, 3b Inverter 4 Controller 5 Shunt 6 Commercial power supply 7 Load 8 Feeder breaker 9 Power converter 12 Pyranometer

[Procedure amendment]

[Submission date] November 9, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H02J 3/46 D 7373-5G H02M 7/48 E 9181-5H

Claims (3)

[Claims] 1. A solar cell and a solar power generation unit including a first inverter for converting DC power of the solar cell into AC power, the solar power generation unit being connected to a commercial power system, and the commercial power Near the power supply side of the system, a battery that absorbs the output fluctuation of the solar cell, a second inverter that converts the DC power of the battery into AC power, and the second inverter
The solar power generation device is provided with a control device for controlling the output power of the inverter. 2. A solar cell and a solar power generation unit including a first inverter for converting DC power of the solar cell into AC power, the solar power generation unit being connected to a commercial power system, Near the power supply side of the system, a battery that absorbs the output fluctuation of the solar cell, a second inverter that converts the DC power of the battery into AC power, and the second inverter
A control device for controlling the output power of the inverter is provided, the information of the solar radiation intensity or the solar cell output is input to the control device, and the output power of the second inverter is controlled based on the input information. Solar power generator. 3. A solar cell, and a solar power generation section including a first inverter for converting DC power of the solar cell into AC power, the solar power generation section being connected to a commercial power system, and the commercial power Near the power supply side of the system, a battery that absorbs the output fluctuation of the solar cell, a second inverter that converts the DC power of the battery into AC power, and the second inverter
A control device for controlling the output power of the inverter is provided, and information about the output power and the operating capacity of the commercial power system is input to the control device, and the second power is input based on the input information.
A solar power generation device characterized by controlling the output power of the inverter.