JP2007330057A - Charge control method of solar light system with secondary battery - Google Patents

Charge control method of solar light system with secondary battery Download PDF

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Publication number
JP2007330057A
JP2007330057A JP2006160336A JP2006160336A JP2007330057A JP 2007330057 A JP2007330057 A JP 2007330057A JP 2006160336 A JP2006160336 A JP 2006160336A JP 2006160336 A JP2006160336 A JP 2006160336A JP 2007330057 A JP2007330057 A JP 2007330057A
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power
secondary battery
system
output
power generation
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Osamu Habatake
Yoshiaki Kobashi
Makoto Riyuuji
Noriaki Tokuda
義昭 小橋
則昭 徳田
修 羽畑
真 龍治
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Kawasaki Plant Systems Ltd
カワサキプラントシステムズ株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects
    • Y02E10/58Maximum power point tracking [MPPT] systems
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of electrical power generation, transmission or distribution, i.e. smart grids as climate change mitigation technology in the energy generation sector
    • Y02E40/72Systems characterised by the monitoring, control or operation of energy generation units, e.g. distributed generation [DER] or load-side generation
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/10Systems characterised by the monitored, controlled or operated power network elements or equipment
    • Y04S10/12Systems characterised by the monitored, controlled or operated power network elements or equipment the elements or equipment being or involving energy generation units, including distributed generation [DER] or load-side generation
    • Y04S10/123Systems characterised by the monitored, controlled or operated power network elements or equipment the elements or equipment being or involving energy generation units, including distributed generation [DER] or load-side generation the energy generation units being or involving renewable energy sources

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charge controller for effectively controlling a peak of power supplied from a system power supply and distributing power generation output which is economically advantageous in a solar light generating system with a secondary battery, which is used as an auxiliary power supply for the system power supply. <P>SOLUTION: The solar light generating system is provided with a solar light generating panel 11, a secondary battery 13, and a power conditioner 12. An output terminal is connected to a power system so as to use it. The power conditioner 12 supplies output of the solar light generating panel 11 to a power system line 28 in a time zone where power load is large, and it supplies the output to the secondary battery 13 in the other time zone. Output of the secondary battery 13 is supplied so that an amount of power supplied from the power system does not exceed a prescribed upper limit value in accordance with a power demand amount. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a charging control method for a solar power generation system that is used as an auxiliary to system power, and more particularly to a charging control method that effectively relieves daytime peak load by a solar power generation system using a secondary battery. .

Photovoltaic power generation has the advantage of using clean natural energy, but is dependent on solar radiation and cannot secure a stable power generation amount. Moreover, the amount of photovoltaic power generation does not necessarily correspond to the power demand.
For this reason, generally, photovoltaic power generation is used as an auxiliary to system power supplied from an electric power company. In addition, a method of covering unstable power generation by using a secondary battery and charging the secondary battery with electric power generated by sunlight and discharging it at the peak of power demand is also used.

In order to adjust between the power supply and the demand, the power company decides the upper limit value of the power that can be used for each customer by contract, and increases the power usage fee with respect to the contract power. It is set. The power upper limit value is determined in advance as a predetermined value.
In this contract, if the peak value of power consumption exceeds the contract power, a high power charge according to the new contract power will be imposed from the next time. Therefore, it is preferable for the consumer to prevent the peak value of power consumption from exceeding the contract power. It is also economically advantageous to effectively perform peak cuts and apply lower contract power.

  In Patent Document 1, considering that the secondary battery has a charge / discharge loss of about 20%, for example, the power generated by solar power is used directly as much as possible. Recharge the secondary battery to the optimal charging rate, reduce the received power by directly using solar power generation in the daytime when the power demand is large and the power rate is high, and the peak of demand exceeds the received power upper limit value In such a case, a secondary battery control method is disclosed in which the peak is cut by compensating with the power stored in the secondary battery. Here, as an example, it is described that the surplus power is accumulated in the secondary battery when the received power falls below a predetermined lower limit value.

  As described above, many systems have been proposed in which a photovoltaic power generation device is combined with a power storage device such as a secondary battery to level the power generation output and efficiently save system power. However, these are intended to stabilize the output as a solar power generation device or to equalize the power demand so that they can be mixed with system power. It is a system that cannot support the functions of the system and must be supplemented by grid power.

  Patent Document 2 discloses a photovoltaic power generation system that can supply the generated power of a solar battery to a load and sell surplus power to a power supply system, store nighttime power in a storage battery, and use it as a power peak shift means. . The disclosed invention is intended to utilize the generated power as much as possible by charging the storage battery with the power of the solar cell generated exceeding the load power when the power system voltage rises and power selling is not permitted. is there. The disclosed invention is intended for a large-scale photovoltaic power generation system, and presents a measure not to waste surplus power when the output of a solar cell exceeds demand.

However, since the photovoltaic power generation system is still expensive at present, it is often used as an auxiliary power source, and adapting to the price policy of the system power source is beneficial to both the power company and the customer.
In other words, the grid power supply adopts a price policy that gradually reduces electricity charges as the upper limit of power supply decreases, suppressing the peak of consumer power consumption, reducing the load on the power plant, and rationalizing the load distribution is doing.
JP 2004-249481 A JP 2004-180467 A

  Therefore, the problem to be solved by the present invention is to effectively peak power supplied from the system power source using only the photovoltaic power in the photovoltaic power generation system with a secondary battery used as an auxiliary power source for the system power source. It is an object of the present invention to provide a charging control device that suppresses power generation and distributes an economically advantageous power output.

  In order to solve the above problems, a charging control device for a photovoltaic power generation system with a secondary battery according to the present invention includes a photovoltaic power generation panel, a secondary battery, and a power conditioner. In a power generation system, the power conditioner has a power receiving function, a logic operation function, and a calendar timer function, and supplies the output of the photovoltaic power generation panel to the power system line during a time when the power load is large. Is supplied to the input terminal of the secondary battery and replenishes the output of the secondary battery so that the amount of power supplied from the power system corresponding to the power demand does not exceed a predetermined upper limit value. To do. In addition, it is preferable to supply the output of the photovoltaic power generation panel to the power system line even when the secondary battery has no power storage capacity.

Furthermore, a wattmeter that measures the power supplied to the power system, an ammeter that measures the amount of stored power in the secondary battery, and a peak cut controller that disconnects the connection by selecting a load that has been set in advance at the peak of the power demand. And measure the amount of power supplied from the power grid with a wattmeter, and if the measured grid power supply amount shows a peak and is likely to exceed the upper limit, power is supplemented from the secondary battery, If it is insufficient, it is preferable to select and disconnect the load according to the priority. Note that the charge control device of the present invention detects a state in which the grid power supply amount is likely to exceed the upper limit value, so that a value that does not exceed the upper limit value is set in advance as a switching reference value and is used. It may be.
In addition, when the grid power supply exceeds the switching reference value, the power supplied to the load is added to the secondary battery power with a constant output, and the solar radiation measured by the solar radiation meter is divided by the maximum solar radiation. By increasing the output of the photovoltaic power generation panel based on the coefficient, the installed capacity of the secondary battery can be reduced using the photovoltaic power generation.

In order to absorb the daily weather change and to effectively use the peak cut function, the secondary battery to be used needs to be able to store and discharge the solar cell output power rapidly.
A secondary battery corresponding to this is used, in particular, by using a hydrogen storage alloy particle as an active material on the negative electrode side and nickel oxyhydroxide particles as an active material on the positive electrode side, immersed in an aqueous potassium hydroxide solution as an electrolytic solution. It is preferable to use a new nickel-metal hydride battery ("Gigacell (trademark)" manufactured by Kawasaki Heavy Industries, Ltd.) formed by sandwiching a cylindrical electrode plate between separators and stacking it into a cell.
Gigacell (trademark) generates an electromotive force of 1.2 V for each cell and can be increased in voltage by stacking. Since the internal resistance is small, the battery can be charged / discharged about 20 times faster than a conventional redox flow battery, and a large capacity can be easily achieved by laminating plate electrodes. Moreover, it is possible to charge and discharge the battery capacity almost completely. Therefore, if this new type nickel metal hydride battery is used, it can be executed sufficiently quickly both when the photovoltaic power generation output is stored in the secondary battery and when power is supplied from the secondary battery.

According to the charging control method for a photovoltaic power generation system of the present invention, the operation mode of the photovoltaic power generation system is selected in consideration of the three conditions of the power demand situation, the storage state of the storage battery, and the voltage and supply power of the system power supply. Automatic operation can be performed to ensure efficient and efficient system operation.
The electric power stored in the secondary battery is only the electric power supplied from the solar power generation panel and does not require the raw material cost, and the true energy saving can be achieved.
In addition, by introducing a solar power generation system, the peak value of power demand can be gradually reduced to lower the upper limit value corresponding to the contract power. Can be reduced.

Hereinafter, the present invention will be described in detail based on embodiments with reference to the drawings.
FIG. 1 is a block diagram showing an example of a photovoltaic power generation system according to the present invention, FIG. 2 is a circuit diagram, FIG. 3 is a waveform diagram explaining a charge control method, and FIG. 4 is a flowchart explaining a control procedure at the time of setting. FIG. 5 is a flowchart for explaining the control procedure during normal operation, FIG. 6 is a flowchart for explaining the control procedure during independent operation, and FIG. 7 is a conceptual diagram for explaining an example of a change in the composition ratio of the peak cut power source depending on the sunshine intensity. 8 is a conceptual diagram illustrating the principle of a secondary battery that can be used in the present invention, and FIG. 9 is a perspective view of the secondary battery.

  The photovoltaic power generation system of the present embodiment is a system power subsidy in which a consumer installs the solar cell panel 11 on the roof 10 of the house 1 or the rooftop of a building, and purchases the photovoltaic power generated from an electric power company. As a result, the power cost is reduced.

The grid power is taken in via a power receiving board 2 of a substation provided for a customer's facility.
The power receiving panel 2 includes a main switch 21 for taking in system power, a bus 28 for supplying power to a load or load group 27, an open / close switch 25 for distributing power from the bus 28 to each load or load group 27, and this embodiment. The switch 24 connected to the output terminal of the solar power generation system of the example, the system voltmeter 22 provided on the upstream side of the bus 28 for measuring the supply voltage from the power system, and the system watt meter for measuring the power supplied from the power system 23 is provided.
As a solar power generation system, a secondary battery 13, a power conditioner 12, a peak cut controller 14, and a solar cell panel 11 and a thermometer 15 are installed on the roof 10 in addition to the solar battery panel 11.

These components are connected as conceptually represented in FIG. 2 and constitute the present invention.
Referring to FIG. 2, the output terminal of the solar battery panel 11 is connected to the power input terminal of the power conditioner 12 via the diode 17. An input / output terminal of the secondary battery 13 is further connected to the power input terminal of the power conditioner 12 via a circuit switch 16. The number of series cells of the secondary battery 13 is determined so that the output voltage of the battery is equal to the output voltage of the solar battery panel 11.

  The power conditioner 12 has a power receiving function, a logical operation function, and a calendar timer function, and inputs the measurement output of the pyranometer / thermometer 15 and the system voltmeter 22 and the command output of the peak cut controller 14, The power generation output of the panel 11 and the discharge output of the secondary battery 13 are received, and the charging of the secondary battery 13 and the power supply to the bus 28 are controlled.

  The peak cut controller 14 monitors the power value based on the measurement output of the grid power meter 23, and cooperates with the power conditioner 12 to supply the photovoltaic power generation output so that the peak value does not exceed the contractual upper limit value. Adjust. Further, when the power supply by the power conditioner 12 is not sufficient, such as when the photovoltaic power generation is insufficient or when the secondary battery storage power is insufficient, the load is disconnected by controlling the open / close switch 25 in the switch regulator 26 according to a predetermined priority order, Adjust so that the power supplied from the grid is below the upper limit.

FIG. 3 is a conceptual waveform diagram for explaining the charge control method of the present embodiment. FIG. 3A shows the relationship between the power demand waveform and the power supply, and FIG. 3B shows the output waveform of the photovoltaic power generation panel 11. (C) shows the charge / discharge waveform of the secondary battery.
In this example, power consumption is low in the morning and night and increases in the daytime. Sometimes (a) shows a sudden increase in demand as shown by the dotted line in the figure, and therefore, a power contract having an upper limit at a level at which this sudden maximum peak value does not reach has been concluded.

Therefore, by introducing the photovoltaic power generation system of the present embodiment, the power cost is reduced by gradually reducing the system power and lowering the power purchase level below the lower contract upper limit value.
The conventional solar power generation system introduction policy was to supplement the power demand with solar cells as much as possible to cover the shortage with power purchase, but in this example, solar power generation can save power purchases to the extent possible. However, the company has been working to reduce costs by reducing the upper limit of power purchase contracts.

As shown in FIG. 3, before the grid power reaches the switching reference value that is lower than the new contract upper limit by a predetermined amount, all the photovoltaic power generation output is supplied to the secondary battery 13 and charged, and the switching reference value is scheduled to be reached. At around this time, the system power is reduced by switching so that all the photovoltaic power generation output is supplied to the system line 28 as it is.
If the grid power is likely to exceed the contract upper limit value by adding only the photovoltaic power generation output, control is performed so that the insufficient power is compensated from the secondary battery 13 and becomes the upper limit value or less. Further, when a sudden load peak occurs, power is supplied from the secondary battery and supplemented.
In the afternoon, when power consumption decreases and the time is scheduled to be sufficiently lower than the contract upper limit value, the direct supply from the solar cell panel 11 is stopped, and the total amount of solar power output is the secondary battery 13. Switching to charging, and recovering the amount of stored power that was discharged and reduced during peak cuts.

(C) As shown in FIG. 5C, the secondary battery 13 is charged with all of the generated solar battery output from the sunrise to the point when the supply destination is switched during the morning sunshine hours, and then solar power generation. While all the outputs are supplied to the load, when the power supply amount from the system exceeds the switching reference value lower than the upper limit value, the system line is discharged and the supply amount from the system is reduced. Further, the solar power generation output is charged again from the charging start time to sunset.
In order to compensate for a sudden peak in power demand, the required amount is discharged as shown by the dotted line to supply power to the system line.
Even in the charging time zone, when the battery capacity is satisfied, the battery charging is stopped to avoid overcharging, and the photovoltaic power generation output is supplied directly to the bus.

  FIGS. 4 to 6 are flowcharts for explaining a procedure in an automatic operation executed by a logical operation function or the like of the power conditioner 12 that performs the charge control method according to the present embodiment. These procedures may be stored as a program in a built-in computer and executed on the occasion.

First, it is necessary to set the power conditioner 12. FIG. 4 is a diagram for explaining the procedure.
The calendar function of the power conditioner 12 stores the sunrise time and sunset time for each calendar day (S11). Thereby, the time slot | zone when the solar power generation for every calendar day is possible is known.
Next, sunshine intensity data for each calendar day is input (S12). The sunshine intensity data for each day and place is given as astronomy data.

The standard time zone required for charging the secondary battery is calculated from the sunshine intensity data for each calendar day. During the charging time period, the power demand is at its peak, for example, avoiding the time zone from 12:00 to 14:00, from sunrise to the appropriate time in the morning, and from the appropriate time when the power demand in the afternoon decreased to the sunset (S13).
The morning charge end time and the afternoon charge start time calculated for each calendar day are stored (S14). The charging end time and the charging start time must be the time when the power demand becomes lower than the contract upper limit value. For example, the charging end time is 10:00 and the charging start time is 15:00.

  Since the solar power generation output and power demand vary depending on the actual solar radiation intensity and temperature, input the measurement output of the solar radiation meter or thermometer, and based on the past actual values, the appropriate charging end time and charging start Correct to time. In addition, the demand pattern changes depending on the day of the week as well as changes in the season, so it is necessary to make adjustments using the calendar function.

FIG. 5 is a flowchart for explaining the operation procedure of the power conditioner during normal operation.
The power conditioner 12 operates from sunrise to sunset (S21). When it falls in the morning secondary battery charging time zone (S22), when the photovoltaic power generation output voltage becomes higher than the specified inverter input voltage, an effective output is generated from the photovoltaic power generation panel. If there is a margin (S23), the secondary battery 13 is charged with the entire amount of power generation output (S24). During charging, power supply to the load 27 is not performed. If there is no margin in the secondary battery 13 (S23), all of the photovoltaic power generation output is supplied to the load 27 via the system line 28 (S25).

Further, when the secondary battery 13 becomes full by charging the secondary battery 13 (S23), the charging operation is terminated and the total amount of the photovoltaic power generation output is supplied to the load 27 (S25). Even when the secondary battery 13 does not become full due to charging in the morning, when the charging end time is reached (S22), the charging operation is temporarily stopped and the entire amount of the photovoltaic power generation output is supplied to the load 27. (S25).
Even when the secondary battery charging time zone in the afternoon is reached after the charging start time (S22), if the secondary battery 13 has sufficient capacity (S23), the secondary battery 13 is charged with the total amount of solar power output ( If the secondary battery 13 has no margin (S24), all the photovoltaic power generation output is supplied to the load 27 (S25).

While the photovoltaic power generation output is being supplemented to the grid, the power supplied from the grid measured by the grid wattmeter 23 reaches the switching upper limit, more precisely the switching reference value lower than the upper limit by a peak cut. When a peak cut request signal is issued from the controller 14 (S26), the secondary battery output is compensated for in the system (S27). Control is performed so that the switching reference value is maintained by compensation, but the control operation is provided with hysteresis to stabilize the control.
When the peak cut request signal is not issued from the peak cut controller 14 (S26), the solar power generation output is continuously supplemented to the 100% system.

If the switching reference value is exceeded even when the secondary battery output is supplemented to the system (S28), the peak cut controller 14 appropriately selects and shuts off the open / close switch 25 of the switch regulator 26 to load or load group. 27 is cut off to reduce the demand power (S29), so that the peak cut request signal is not output.
Priorities of the loads 27 are determined in advance according to the importance, and are sequentially disconnected until the system power does not exceed the upper limit value.
When the grid power falls below the switching reference value by supplementing the secondary battery output to the grid line 28 (S28), it is not necessary to disconnect the load.

When the peak cut request signal is not output (S30), after waiting for a certain period of time, the supply of the output of the secondary battery 13 is stopped and the peak cut operation is finished (S31). After that, only the solar power generation output is supplemented to the power system.
As described above, when the afternoon charging start time comes, power supply from the solar power generation panel 11 to the load 27 is stopped, and the entire amount is directed to the secondary battery 13 to start charging.
The afternoon charging operation ends when the sun's inclination increases and the photovoltaic power output falls below a specified value. Further, when the capacity of the secondary battery 13 is exhausted, the circuit is switched to supply the entire amount of the photovoltaic power generation output to the load 27.

FIG. 6 is a flowchart for explaining the procedure of the independent operation performed by the power conditioner 12 to maintain safety during a power failure.
When the system voltmeter 22 detects an abnormal drop in the system voltage and detects the occurrence of a power outage accident (S41), the load 27 necessary for facility safety and plant abnormality prevention is left and it may be shut down. The power supply of the apparatus is turned off (S42), and the photovoltaic power generation output is supplied to the entire system line 28 instead of the system power (S43).
As a result, even when there is an abnormality in the grid power, the photovoltaic power generation output can be temporarily supplied to necessary equipment to ensure security.

When the load of the minimum operating device is insufficient with the photovoltaic power generation output (S44), the shortage is compensated from the secondary battery 13 (S45). Even when there is no photovoltaic power generation output at night or overcast, power must be supplied from the secondary battery 13 to ensure independent operation.
When the photovoltaic power generation output is larger than the demand amount of the load (S44), the surplus is used for charging the secondary battery 13 so as not to waste the generated power (S46).
When the system voltage is restored and the power supply is restored (S47), the self-sustaining operation is terminated and the normal operation is resumed (S48).

Furthermore, the maximum value of the output Pc of the power conditioner 12 during peak cut operation is determined as Pcm. For example, according to a function shown in FIG. 7, the solar radiation intensity index a (solar radiation intensity Ps / maximum solar radiation intensity Psm), The maximum secondary battery output Pbm can be determined by the following formula based on the secondary battery coefficient b (Pbm / Pcm) normalized by the maximum output value Pcm of the power conditioner.
Pc = Pcm (k * a + b)
Also,
Pc = a * Pcm + (1-a) * Pbm
Here, k is a sunlight coefficient ((Pcm−Pbm) / Pcm).

When adjusting the power conditioner 12 during peak cut operation by the above method, for example, when the maximum secondary battery output b is 50 kW, the maximum power conditioner output is 100 kW, and the maximum output of the solar battery is 70 kW,
(1) When solar radiation cannot be expected at all, the secondary battery is operated at a maximum output of 50 kW,
(2) When the solar radiation intensity is 50% of the maximum intensity, the solar battery output is 35 kW, supplemented by 40 kW from the secondary battery, and operated at 75 kW.
(3) When the solar radiation shows the maximum intensity, the maximum output operation can be performed by supplementing 30 kW from the secondary battery.

As described above, when the maximum value Pbm of the secondary battery output is smaller than the maximum output Psm of the solar battery, the power conditioner output Pc at the time of peak cut is Pbm as the minimum value, Increases and becomes maximum at maximum solar radiation intensity. When the inverter output Pc is maximum, the secondary battery output Pb decreases to Pcm-Psm.
Therefore, when the solar radiation intensity is high, the output of the secondary battery during peak cut operation can be suppressed and the duration can be increased.

8 and 9 are an operation principle diagram of a secondary battery recommended to be used in this embodiment and a partially cutaway perspective view showing an appearance.
The secondary battery used in this example is required to have a charge / discharge time as short as possible and a large capacity.
As a secondary battery satisfying these conditions, there is a new type nickel hydride battery (manufactured by Kawasaki Heavy Industries, Ltd., Gigacell (trade name)).

This new nickel-metal hydride battery (Gigacell (trade name)) uses hydrogen storage alloy particles as the negative electrode active material, nickel oxyhydroxide particles as the positive electrode active material, and potassium hydroxide, sodium hydroxide, water as the electrolyte. An alkaline aqueous solution such as lithium oxide is used.
As shown in FIG. 8, the electrolyte solution was filled while the current collector was placed across an ion permeable separator, the positive electrode active material was charged on the positive electrode side, the negative electrode active material was charged on the negative electrode side, When the current collectors are connected to each other by a conductive wire, the positive electrode active material receives electrons on the positive electrode side to generate hydroxyl groups, and the generated hydroxyl groups pass through the separator and move to the negative electrode side, so that hydrogen contained in the negative electrode active material and It reacts to generate water and electrons, which are collected by the current collector on the negative electrode side to complete the electric circuit.

The battery action is represented by the chemical reaction formula as follows.
Positive electrode: NiOOH + H 2 O + e ← → Ni (OH) 2 + OH
Negative electrode: NH + OH ← → M + H 2 O + e
Overall: NH + NiOOH ← → M + Ni (OH) 2
Electromotive force: 1.2V

Electrons supplied from the positive electrode current collector plate spread into the electrolyte, react with the nickel oxyhydroxide particles dispersed in the electrolyte to generate hydroxyl groups, and on the negative electrode side, the hydrogen occluded dispersed in the electrolyte similarly. It reacts with hydrogen in the material particles to generate electrons. Since the mobility of charged particles in the electrolytic solution is large and the reaction area is large, the charge / discharge rate is extremely fast.
Furthermore, while conventional nickel water and secondary batteries use thin-film electrodes, Gigacell (trade name) is a separator formed by pleating a strip-shaped electrode as shown in FIG. A single battery is configured by inserting the battery into a battery container, and further connecting the batteries in series via a partition wall to form a giga cell (trade name).

For this reason, Gigacell (trade name) has a small internal resistance and can be charged and discharged about 20 times faster than NaS batteries and redox flow batteries. In addition, it is easy to increase the capacity because of the laminated structure.
Furthermore, it can be charged / discharged to almost 100% of the capacity, the allowable number of charge / discharge repetitions is extremely large, and the life due to charge / discharge is also long. In addition, since the efficiency in charging / discharging is high, the utilization efficiency of photovoltaic power generation output also becomes high.

  If the said Giga cell (brand name) is used as a secondary battery of the photovoltaic power generation system of a present Example, it can charge / discharge efficiently according to immediately when switching charging / discharging of a secondary battery. Moreover, peak cut performance can be improved by using a large capacity battery.

The charge control method of the photovoltaic power generation system with a secondary battery according to the present invention charges the secondary battery with only solar power with extremely low raw material costs, and does not use the useful nighttime power even though it is low in price as in the past. The economy is excellent. Further, when the system power consumption is operated so as to reduce the contractual upper limit value, the contract power can be reduced to a lower cost stage, and the power charge can be saved.
For example, in a relatively large facility such as a school, a large-area solar cell panel can be installed on the roof of the school building to effectively use solar power generation. Moreover, since the power demand pattern is simple in schools and the like, the method of the present invention can be used effectively.

It is a block diagram which shows the Example of the solar energy power generation system which concerns on this invention. It is a circuit diagram of the photovoltaic power generation system of a present Example. It is a wave form diagram explaining the charge control method of the solar energy power generation system of a present Example. It is a flowchart explaining the control procedure at the time of the setting of a present Example. It is a flowchart explaining the control procedure at the time of the normal driving | operation of a present Example. It is a flowchart explaining the control procedure at the time of the independent operation of a present Example. It is a conceptual diagram explaining the example of a change of the peak cut electric power source composition ratio by solar radiation intensity. It is a conceptual diagram explaining the principle of the secondary battery which can be utilized for this invention. 1 is a perspective view of a secondary battery that can be used in the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 House 10 Roof 11 Solar panel 12 Power conditioner 13 Secondary battery 14 Peak cut controller 15 Solar radiation meter / thermometer 16 Circuit switch 17 Diode 2 Substation receiving panel 21 Main switch 22 System voltmeter 23 System watt meter 24 Solar power Switch for power generation system 25 Open / close switch 26 Switch regulator 27 Load group 28 Bus / system line

Claims (7)

  1. In a solar power generation system used by connecting a solar power generation panel, a secondary battery, and a power conditioner to an electric power system that supplies an output terminal to a load, the power conditioner includes a power receiving function, a logical operation function, and a calendar timer. When the preset power demand is large and when there is no power storage margin in the secondary battery, the output of the photovoltaic panel is supplied to the power grid, When the secondary battery has a power storage margin, supply the output of the photovoltaic power generation panel to the input terminal of the secondary battery, and supply from the power system measured by a power meter provided in the power system Control device for a photovoltaic power generation system with a secondary battery, wherein the output of the secondary battery is replenished so that the amount of electric power to be supplied does not exceed a predetermined upper limit value
  2. Furthermore, a power meter for measuring the power supplied to the power system, a voltmeter and an ammeter for measuring the amount of power stored in the secondary battery, and a load whose priority is set in advance at the peak of power demand for the power system And a peak cut controller that disconnects the connection by selecting the priority order, measures the amount of power supplied from the power system with the power meter, shows the peak of the measured system power supply amount, and sets the upper limit value in advance. When the switching reference value set to a value that does not exceed is exceeded, power is supplemented from the secondary battery, and when the switching reference value is exceeded even by compensation, the load is selected and disconnected according to priority. The charge control device for a solar power generation system with a secondary battery according to claim 1.
  3. Furthermore, the power supplied to the load when the switching reference value is exceeded, based on the solar radiation intensity index obtained by dividing the solar radiation amount measured by a solar radiation meter in addition to the secondary battery power with a constant output by the maximum solar radiation amount 3. The photovoltaic power generation system with a secondary battery according to claim 1, wherein the installed capacity of the secondary battery is reduced by increasing the output of the photovoltaic power generation panel to also use photovoltaic power generation. Charge control device.
  4. The secondary battery uses hydrogen storage alloy particles as a negative electrode active material and nickel oxyhydroxide particles as a positive electrode active material suspended in an aqueous potassium hydroxide solution as an electrolyte, and sandwiches a strip-shaped electrode plate between separators. The solar cell system with a secondary battery according to any one of claims 1 to 3, wherein a nickel-metal hydride battery that is stacked and inserted into a cell and formed and charged and discharged at high speed is used. Charge control device.
  5. When the output terminal of a photovoltaic power generation system equipped with a photovoltaic power generation panel and a secondary battery is connected to an electric power system that supplies power to the load, when the preset power load is large and the secondary battery has no power storage margin Supplies the output of the photovoltaic power generation panel to the power system line, and when there is a power storage margin in the secondary battery outside the time zone, the output of the photovoltaic power generation panel is used as the input terminal of the secondary battery. A charging control method for a photovoltaic power generation system with a secondary battery, wherein the output of the secondary battery is replenished so that the amount of power supplied from the power system does not exceed a predetermined upper limit value .
  6. Measure the amount of power supplied from the power system, and if the measured system power supply amount exceeds the switching reference value set in advance not exceeding the upper limit value, the power is compensated from the secondary battery. The charging control method for a photovoltaic power generation system with a secondary battery according to claim 5, wherein when the load is insufficient due to compensation, the load is selected and disconnected according to priority.
  7. Further, the power supplied to the load when the switching reference value is exceeded is increased based on the solar radiation intensity index obtained by dividing the solar radiation amount measured by the solar radiation meter by the maximum solar radiation amount in addition to the secondary battery power having a constant output. 7. The charge control method for a secondary battery-equipped solar power generation system according to claim 5, wherein the installed capacity of the secondary battery is also reduced by using solar power generation power.
JP2006160336A 2006-06-08 2006-06-08 Charge control method of solar light system with secondary battery Pending JP2007330057A (en)

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