JP2014103819A - Charging device, charging method, power supply system and residual stored power amount measuring method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging device for charging a rechargeable battery at a time less than output from a photovoltaic panel which cannot generate power due to cloudy weather or from wind power generation under a weak wind force, a charging method, a high-efficiency power generation and supply system which is available all the time, and a residual stored power amount measuring method thereof.SOLUTION: The charging device comprises: a low voltage detector which is connected between a power conditioner (PCS) of a power generation system effectively utilizing natural energy and a rechargeable battery, detects an operational voltage range of the PCS, and determines that the operational voltage is equal to or lower than a predetermined value; and a relay with a contact for not electrically connecting an input-side DC circuit of the PCS and the rechargeable battery when the operational voltage exceeds the predetermined value, but electrically connecting the input-side DC circuit of the PCS and the rechargeable battery when it is determined that the operational voltage is equal to or lower than the predetermined value. The charging device is capable of providing a high-efficiency power supply system which is available all the time in combination with a charging/discharging amount measuring section for residual capacitance value confirmation of the rechargeable battery.

Description

  The present invention relates to a charging device, a charging method, a power supply system, and a remaining power storage measurement for using a power generation device utilizing natural energy in combination with a storage battery in order to construct a highly efficient power supply system that can always be used. Regarding the method.

  Power generation methods utilizing natural energy (solar power generation, wind power generation, micro hydropower generation, etc.) are becoming popular and accelerating.

  However, solar power generation, wind power generation, and the like have fate that depends on natural weather phenomena such as the weather, and as a countermeasure, there are many ways to improve power generation efficiency. For example, Patent Document 1 discloses that the operation system optimizes the sunset time period from the sunrise time in order to reduce fluctuations in the amount of power sold to the power system by a plurality of solar power generation devices.

  On the other hand, Patent Document 2 describes an invention in which charging efficiency is improved by linking a DC power supply device in a home for charging an electric vehicle storage battery.

  In addition, according to a recent newspaper, there are some articles that power storage batteries for electric vehicles can be fed into the home in the event of a power outage to take measures against power outage.

JP 2010-288393 A JP 2003-79059 A

  However, although a storage battery is required for stabilization of solar power generation, when the battery is used for power sale, since the connection of the storage battery is not permitted, there is a problem that it is limited to self-consumption.

  In addition, because of the amount of power generated by the solar panel according to the amount of solar radiation, the amount of power generated is extremely small in a cloudy sky, or power generation is not possible. A similar situation is seen in the case of wind power generation when the wind power is extremely weak.

  The present invention has been made in order to solve such problems, and its purpose is to configure a charging circuit in a storage battery when the solar panel is unable to generate power during cloudy weather or when the output of wind power is weak or less. An object of the present invention is to provide a charging device that can be charged by matching a storage battery with a DC / DC converter (D / D converter).

  The capacity of the storage battery is represented by [Voltage (V) × Current (A) × Time (h)]. In general, since the voltage (V) drop can be easily monitored, the voltage V is a specified value (rated 12V). When 10.5V becomes lower than the use lower limit voltage), the normal use is stopped, it is returned to 12V by recharging work, and reloading is performed. In the present invention, instead of this conventional method, the current (A) at the input end of the storage battery is processed as a product of [A × h] which is measured as the input / output (charge mode when entering, discharge use mode when exiting). The amount of charge and the amount of discharge are displayed. That is, by providing a charge / discharge amount measuring unit having a remaining capacity indicator of how much the charge amount is, a power supply system that measures the remaining capacity of the storage battery and makes the charge amount and the discharge amount visible Is to provide.

  A DC charging device is provided between a relay box of a power generation device utilizing natural energy such as a solar panel or wind power generation and a power conditioner (PCS) to provide a circuit configuration for a storage battery. The charging device of the present invention is provided with a DC charging device that operates a relay with a contact by a low voltage detector that is determined to be below the PCS operating voltage range, and charges the battery by matching with the storage voltage by a D / D converter. It is.

  In addition, the charging device of the present invention is electrically connected to the contact point outside the operating range of the internal control unit of the PCS and / or the sunshine meter in order to confirm the presence / absence of the PCS and / or the amount of sunshine. An AND circuit connected in parallel may be provided, and in addition to this, at least one of a capacitor constituting a circuit for accumulating charging power and a backflow prevention diode for preventing current backflow from the storage battery may be provided. .

  Further, the charging method of the present invention includes a step of detecting an operating voltage range of a power conditioner (PCS) of the power generator and determining that the operating voltage is less than a predetermined value, and the operating voltage is not less than a predetermined value. Sometimes, the input DC circuit of the PCS and the storage battery are not electrically connected, and when the operating voltage is determined to be less than a predetermined value, the input DC circuit of the PCS and the storage battery are electrically connected. By connecting to the storage battery, the electric power from the power generator is charged to the storage battery. Furthermore, it may have a step of confirming the presence / absence of the operation of the PCS and / or the amount of sunshine by the out-of-operation condition contact and / or the sunshine meter of the internal control unit of the PCS.

  Further, the power supply system of the present invention discriminates the charge amount ((+) Ah) and the discharge amount ((−) Ah) by arranging a DC current detector at the input part to the storage battery, and the remaining of the storage battery. A charge / discharge measurement unit that can also confirm the capacity value is provided.

  The method of measuring the remaining capacity of the storage battery performed in the power supply system of the present invention is electrically arranged and connected between the charging device and the storage battery, and the external terminal portion of the storage battery A step of detecting a current at the time of charging and discharging by a current detector provided in the step, a step of obtaining a charge amount and a discharge amount as respective cumulative integral values, and a cumulative integral value of the discharge amount from the cumulative integral value of the charge amount The process of subtracting is performed to calculate the remaining capacity value of the storage battery, and the remaining capacity value is displayed.

  According to the configuration of the present invention described in the above means, the following effects can be obtained. The battery can be charged by installing the charging device of the present invention even when there is no solar power generation in cloudy weather or when the wind power is weak and sufficient power is not obtained. This eliminates the waste of power generation due to the use of natural energy. In addition, in order to confirm the presence / absence of the operation of the PCS and / or the amount of sunshine, an AND circuit electrically connected in parallel with the contact point outside the operating range of the internal control unit of the PCS and / or the sunshine meter By providing this, a highly reliable charging device that can reliably comply with the regulation that a storage battery must not be connected to the DC circuit on the input side of the PCS is obtained when selling power as a solar or wind power generator. It is done. Furthermore, by providing at least one of a capacitor for storing charging power and a backflow prevention diode for preventing current backflow from the storage battery, the function of the charging device can be improved.

  According to the power supply system of the present invention, the amount of charge to the storage battery can also be measured, so that the residual capacity value of the storage battery can be found even when the storage battery is in the charge mode and the discharge use mode. As a result, it is possible to know when the storage battery can no longer be used, and it is possible to take measures in advance for quick charging or for restricting the use of energization, which makes it easy to use the stored power. Furthermore, by providing an AC power supply unit for converting the direct current from the storage battery into alternating current and generating power to the commercial power system, or an AC power supply unit for supplying AC voltage from the commercial power system to the storage battery, Since sudden storage capacity stoppage can be prevented or rapid charging can be performed, a highly efficient power supply system that can be used at all times can be constructed.

  In addition, the method for measuring the remaining amount of electricity performed by the power supply system of the present invention considers the heat loss during charging from the rule of thumb, and applies a correction value for estimating the charge capacity more than the discharge amount. It is possible to appropriately control and manage the remaining capacity of the storage battery due to charging and discharging in a state in accordance with the actual situation.

It is a circuit diagram which shows the structure of the charging device of this invention. FIG. 4 is a diagram showing an AND circuit in which a low voltage detector is electrically connected in parallel with an out-of-operation condition contact of an internal control unit of PCS and / or a sunshine meter in the charging device of the present invention. It is operation | movement explanatory drawing of the DC charging part by the charging device of this invention. It is a figure which shows the electric power supply system of this invention. It is operation | movement explanatory drawing of the charging / discharging measurement part in the electric power supply system of this invention. In the electric power supply system of this invention, it is a schematic diagram of a power generation part when using solar power generation and wind power generation together.

The structure of the charging device of the present invention will be described with reference to FIG.
FIG. 1 shows a solar power generation device as an example of a power generation device that utilizes natural energy. In the solar power generation apparatus shown in FIG. 1, reference numeral 1 denotes a plurality of solar panels (P _{1 to} P _n ), which includes a relay box 2 (with a backflow prevention diode) and a PCS (power conditioner) 3. The generated power is measured by the watt-hour meter 4 and connected to the commercial power supply system 5. Here, the PCS has a configuration in which a DC input is received at S ₁ and converted into an alternating current by S _wt (switching circuit), and an AC output is output via Tr (transformer) via S ₂ .

  The charging device 6 of the present invention is used in combination with the solar power generation device having the above-described configurations 1 to 4, and is connected in series with the input terminal portion connected in parallel with the PCS 3 to the input portion of the PCS 3 and the storage battery 10. Output terminal portion.

  The internal processing means of the PCS has a function of making the AC output constant, for example, 100 V or 200 V by switching (Swt) and the transistor (Tr) with respect to the DC input change (generally 250 to 450 V) condition. When the voltage drops to 250 to 200 V, conversion control with a constant AC output becomes impossible, so the DC / AC conversion function is stopped or locked to ensure the quality of AC output (voltage fluctuation and frequency fluctuation).

  As described above, the DC input voltage at which the PCS 3 can operate is generally in the range of 200V to 500V, and practically, AC power having a constant voltage is output in the range of 250V to 450V.

  When the high output condition is sunny and the amount of solar radiation becomes maximum, the DC input voltage rises to 450V to 500V.

  Since it becomes 250 V or less in cloudy weather, the PCS 3 is out of the operating range, and stable AC output control cannot be performed, so that a restrictive lock for stopping AC output is applied.

  In the present invention, the output of the solar cell is intended to be used only when it is less than DC 250V, preferably DC 200V or less in cloudy weather. As a means for that, the DC charging device 6 is connected to the input terminal portion of the PCS 3, Furthermore, it is the method of connecting the charging device 6 and the storage battery 10, and utilizing as charging power.

  The function of the DC charging device 6 will be described using a specific embodiment.

<First Embodiment>
First, the input voltage of the PCS is detected by the low voltage detector (AV) 6-2, and the condition that the pyranometer 6-1 is cloudy is determined by the AND circuit 6-3, and is less than DC250V, specifically DC200V. If it is below, the contact relay 6-4 is operated and charged by the DC / DC converter 6-5 and the backflow prevention diode 6-6 in accordance with the charging voltage of the storage battery 10. As the backflow prevention diode 6-6, a diode having a rated current of 10 to 30 A and a reverse withstand voltage of 500 V or more can be used.

  If a capacitor 6-7 is added here, the differential change output of the amount of solar radiation at the time of cloudy weather can be integrated and accumulated in the capacitor 6-7, so that the charging power can be taken out efficiently. In the present invention, a capacitor having a capacity in the range of 20 to 500 farads (F) is used as the capacitor 6-7.

In addition, when connecting to the DC charging unit 6 by a lead wire by connecting the relay box 2 and the PCS 3, the following restrictions exist.
(1) When selling power as a solar power generation device (using a watt-hour meter 4-1), there is a restriction that a storage battery must not be connected to the DCS input side DC circuit. The reason is that there is a power sale contract condition for only solar power generation, and the power storage input may be used for nighttime power, etc., which violates the contract for the original purpose of power sale.
(2) When self-generating as a solar power generation device (using watt-hour meter 4-2), the above restrictions are eliminated, and storage battery 10 is provided freely to store electricity during the day, use it at night, etc. It would also be possible, in which case, be used in connection with S ₃ of the commercial power system 5 by switching the S ₂ in PCS3.

  Therefore, as in the present invention, as a condition that the solar cell device is not physically connected to the storage battery 10 in the contact relay 6-4, the circuit to the storage battery 10 is physically interrupted under the PCS operating condition. It is essential that

  As a modification of the present embodiment, the low voltage detector 6-2 may be a high resistance installation circuit, and may be used as an input power source for 6-2 with a small voltage.

  Further, as shown in FIG. 2, the condition of the AND circuit 6-3 may use a condition contact outside the operating range of the internal control unit of the PCS 3 instead of the sunshine meter 6-1. FIG. 2 shows an AND circuit 6 in which the low voltage detector 6-2 is electrically connected in parallel with the out-of-range condition contact of the internal control unit of the PCS 3 and / or the sunshine meter 6-1 in the charging device of the present invention. FIG. Here, any one of them may be used as the contact point outside the operating range of the internal control unit of the sunshine meter 6-1 and the PCS 3, or both may be used simultaneously. By combining both, it is possible to reliably comply with the constraint (1) above, so that not only the reliability of the charging function is greatly improved when the charging device 6 is combined with the power generation device, Guarantees can be obtained for the performance of power sale contracts.

  In the present invention, it is not always necessary to provide an AND circuit for connecting the sunshine meter 6-1 and / or the condition contact outside the operating range of the internal control unit of the PCS3. If the restriction condition (1) is relaxed in the future, charging can be performed without providing an AND circuit that connects the sunshine meter 6-1 and / or the out-of-range condition contact of the internal control unit of the PCS 3. The function as a device can be fully exhibited.

FIG. 3 is an operation explanatory diagram of the DC charging unit 6.
The output DC voltage of the solar cell 1 changes in the amount of solar radiation depending on the degree of sunny weather. If the vertical axis indicates the output voltage and the horizontal axis indicates the amount of solar radiation, the operating range of the PCS 3 is DC250V to 450V. Control is performed and the AC output is constant in the PCS. In the case of cloudy weather, when the output of the solar cell 1 is reduced, the PCS 3 is out of the operating range at less than DC 250V, more specifically, DC 200V or less, and the DC charging device 6 performs charge control in the range of DC 200V to 50V as a reusable power source. Indicates use.

  Note that DC50V depends on the number of cell configurations of the storage battery 10. When 24 cells are connected in series at a cell voltage of 2V, the voltage is 48V, and the charging voltage is 48V × 1.2 = 57.6V, which is a DC / DC converter (D / D). The output may be set at 6-5.

  As described above, by attaching the charging device of the present invention, it is possible to charge the storage battery even when the solar power generation during cloudy weather is not performed. Therefore, the charging method of the present invention to be performed includes a step of detecting an operating voltage range of a power conditioner (PCS) of the power generator and determining that the operating voltage is less than a predetermined value, and when the operating voltage is greater than or equal to a predetermined value. The PCS input-side DC circuit and the storage battery are not electrically connected, and when the operating voltage is determined to be less than a predetermined value, the PCS input-side DC circuit and the storage battery are electrically connected. And charging the electric power from the power generation device to the storage battery.

  Furthermore, it has the process of confirming the presence or absence of the operation of the PCS and / or the amount of sunshine by the out-of-range condition contact and / or sunshine meter of the internal control unit of the PCS, and from the power generator to the storage battery In the step of charging the electric power, at least one of the operation voltage is determined to be less than a predetermined value, the PCS is not operating, and the amount of sunshine is less than a predetermined value. When confirmed, the charging method is to electrically connect the DCS input side DC circuit and the storage battery.

<Second Embodiment>
Next, the power supply system of the present invention will be described with reference to FIG.
The power supply system shown in FIG. 4 includes a solar power generation device including a PCS, the charging device 6 of the present invention, and a storage battery 10, and is electrically disposed at least between the charging device and the storage battery. And a charge / discharge amount measuring unit 9 for detecting and displaying the remaining capacity of the storage battery by providing a current detector 9-1 at the external terminal of the storage battery. Here, the charge / discharge amount measuring unit 9 has a function as described below, and is provided to grasp the remaining capacity value of the storage battery.

The storage battery 10 is formed by connecting a plurality of battery cells in series, and voltage × current × time = power consumption (Wh) is determined. It terminal voltage is determined by the cell voltage is _e 1 to e _n.

In the case of a lead storage battery, for example, the condition of a storage battery of [12 V × 60 Ah / 5 hours] is “the rated current I (= 60 A / 5 hours = 12 A / h) is consumed for a certain period of time and the terminal voltage V (= 12 V ) Is the final voltage V _E (= 10.5 V), a time of 5 hours or more is defined as “100% capacity”. Also, it is used in the repeated process of charging and discharging, but the number of repetitions is defined as the cycle life, and a new product is recommended as a replacement life period when the capacity is 80% or less even when charged.

However, the constant current discharger for obtaining this discharge characteristic is expensive and larger than the storage battery, so it cannot be used for general purposes except by electric power manufacturers. The instrument is used in general. However, since the voltage drop characteristics during constant current discharge vary depending on the battery type and manufacturing method, the display on the small indicator is a guideline for checking the limit of load availability and indicates the capacity life (Ah). No. Moreover, the reason why the life of the storage battery is deteriorated, that is, the reason why the battery does not recover even if it is charged is that, in the electrochemical reaction, PbSO ₄ is crystallized to reduce the charging area. Established as a possible method.

Also, as a special situation, the charge capacity (Ah) and the discharge capacity (Ah) are not equal, and if the former is not charged 110 to 120% more, 100% power storage is impossible. This is because when the battery is charged by the constant voltage charging method, the internal impedance in the storage battery increases and the charging current decreases as the battery approaches full charge, so that a slow charging period is required, and the electric power of the solution (H ₂ SO ₄ ) is further increased. It is also caused by the simultaneous occurrence of reactions that do not contribute to charging due to H ₂ gasification in decomposition.

  Therefore, the knowledge that 120% Ah (amount of charge) agrees well with 100% Ah in the discharge test when the charging capacity is charged by a constant voltage charging method that does not cause overvoltage is obtained.

  In the present invention, since the charge amount is charge current × time (Ah), the charge amount can be obtained by the charge / discharge amount measuring unit 9, thereby adopting a method of detecting and displaying the remaining capacity of the storage battery. At this time, the DC current detector 9-1 defines the charge direction as positive (+) and the current in the discharge direction as negative (-).

  A positive (+) and a negative (-) current value can be obtained by the amplifier 9-2 having a level easier to process than the current detector. The charge direction component is measured as [kΣ (+) Ah] 9-3. The coefficient k is a correction value entered from the above knowledge (120% charge capacity = 100% discharge capacity), and here, k = 0.8. On the other hand, the direction component during load discharge is measured as [Σ (−) Ah] 9-4. Note that (+) and (−) shown in [Σ (+) Ah] and [Σ (−) Ah] are symbols indicating the direction of current in charging and discharging, respectively.

  In the present invention, as a rule of thumb, the correction value k needs to be less than 1 and 0.8 or more. In order to estimate the charge capacity more than the discharge amount, it is a necessary condition that the correction value k is less than 1, but conversely, when the correction value k value is less than 0.8, the charge amount becomes too large and the actual value is increased. In this case, excessive charging is required, and the charging efficiency is greatly reduced. The correction value k applied in the present invention is preferably 0.8 to 0.9 from the viewpoint of charge / discharge state and charge efficiency improvement when considering heat loss during charging.

  From time to time, the remaining capacity of the storage battery 10 is obtained by accumulating a charge amount cumulative integrator (Σ (+) Ah) 9-3 and a discharge amount cumulative integrator (Σ (−) Ah) 9-4. At the same time, the data output from the subtracter (ΣAh) 9-5 can be obtained by giving it to the remaining capacity indicator 9-6.

FIG. 5 is an operation explanatory diagram of the charge / discharge amount control measurement unit 9.
The horizontal axis represents time (t), and the vertical axis the charge amount cumulative integrator (Σ (+) Ah) 9-3 is being charged ends at t _1, the discharge amount of the discharge amount cumulative integrator (Σ (-) Ah ) 9-4 is discharged and ends at t ₁ to t ₂ .

Next, ends at t ₄ charged from t ₂ is also overlapping range of the charge and discharge amount as used discharge until t ₃ ~t _5. In such a case, the subtraction difference (ΣAh) 9-5 is always displayed as shown in FIG. 5, so that it can be seen how much discharge capacity remains. Since the amount is displayed on the remaining capacity indicator 9-6, it can be visually confirmed.

  Thus, the major feature of the power supply system of the present invention is that the current detector 9-1 is electrically connected and connected between the charging device 6 and the storage battery 10 and provided in the external terminal portion of the storage battery. A step of detecting current during charging and discharging, a step of obtaining the charge amount and the discharge amount as respective cumulative integral values, and a process of subtracting the cumulative integral value of the discharge amount from the cumulative integral value of the charge amount. And having a method for measuring the remaining capacity of the power supply system comprising the step of calculating the remaining capacity value of the storage battery and the step of displaying the remaining capacity value. Furthermore, as described above, in consideration of the heat loss during charging, the actual value of the remaining capacity of the storage battery due to charging / discharging is applied by applying a correction value for estimating the charging capacity more than the discharge amount from the experience side. Can be properly controlled and managed in accordance with

  In another embodiment of the present invention, as shown in FIG. 4, as shown in FIG. 4, the data of the remaining capacity indicator 9-6 of Ah is converted into PCS-X (8-3) or INV ( 8-1) is linked with the start / stop signal, and when the remaining power amount is a value close to 10%, for example, PCS-X (8-3) or INV (8-1) is stopped, Alternatively, sudden storage capacity stoppage can be prevented by performing start-up control of the A / D converter (7-1) of the AC charging unit 7 as quick charging processing.

In this embodiment, as method of utilizing the storage battery 10, battery discharge current by feeding unit 8 alternating with INV (DC / AC inverter) 8-1, by switching the _{S 7} at associated load ([Delta] L) 5-2 Is consumed.

When PCS-X (8-3) is used, since it is synchronously controlled with the same frequency as the commercial power supply system 5, it is boosted by the D / D converter (8-2) in accordance with the storage battery 10 and the output voltage. since AC output power as the input voltage of -X, the relevant load [Delta] L (5-2) When feeding via _{S 5,} it can be connected as via _{S 5 → S 6 → S 7} . In such a case, the load ΔL (5-2) can be used as power saving that can reduce the contract power as peak cut power supply during the time from 1 pm to 3 pm in the daytime. INV (8-1) because of asynchronous AC output can be used as a power supply during power outages use _{S 7.}

  As yet another embodiment, the storage battery 10 can be charged by the AC charging unit 7 when the amount of charge is required rapidly. That is, power may be supplied from the commercial power supply system 5 through the AC / DC converter 7-1 to match the charging voltage. As a result, not only can a quick charge be dealt with, but an effect of preventing a sudden stop of the storage capacity as described above can be obtained. The backflow prevention diode 7-2 shown in FIG. 4 is provided so as not to interfere with the DC charging unit 6.

  Although FIG. 4 shows only solar power generation as the power supply system of the present invention, the present invention can also be applied to wind power generation or micro hydropower generation. It is also possible to combine two or more of the power generation devices that utilize these natural energies.

  FIG. 6 is a schematic diagram of a power generation unit when solar power generation and wind power generation are used in combination in the power supply system of the present invention. The wind power generation unit 11 shown in FIG. 6 is configured to be connected in parallel with the solar power generation solar panel 1 and is connected to a direct current / direct current (D / D) via a generator (Gen) 11-1. The direct current boosted to about 400 V by the converter 11-2 is electrically connected and supplied to the relay box 2 (backflow prevention diode), and then output to the PCS 3. At this time, an AC / DC (A / D) converter may be used instead of the DC / DC (D / D) converter 11-2. The charging device 6 is connected in parallel with the PCS 3 and is connected in series with a storage battery (not shown in FIG. 6), similarly to the charging device shown in FIGS.

  As described above, according to the charging device and the charging method of the present invention, it is possible to charge the storage battery even when the solar power generation is not performed in cloudy weather or when the wind power generation is weak because the wind power is weak. Therefore, waste of power generation due to the use of natural energy such as sunlight and wind power is eliminated. In addition, in order to have the function of confirming the presence / absence of the operation of the PCS and / or the amount of sunlight, a storage battery is connected to the input DC circuit of the PCS when selling power as a power generation device using sunlight or wind power. Therefore, it is possible to obtain a highly reliable charging device that can reliably cope with a regulation that must not be applied.

  Further, according to the power supply system and the method for measuring the remaining amount of electricity of the present invention, the amount of charge to the storage battery can also be measured, so that the remaining capacity value of the storage battery can be found even when the storage battery is in the charge mode and the discharge use mode. As a result, it is possible to know when the storage battery can no longer be used, and it is possible to take measures in advance for quick charging or for restricting the use of energization, which makes it easy to use the stored power. In addition, an AC power supply unit for converting direct current from the storage battery into alternating current, or an AC power supply unit for supplying AC voltage from the commercial power system to the storage battery, respectively, prevents sudden storage capacity stoppage. Or when quick charging is required. Therefore, the present invention can not only construct a high-efficiency system that can always be used in a power supply system that utilizes natural energy, but also can be applied to various power generation modes. Extremely high.

1 Solar panel 7 AC charging unit 2 Relay box 8 Power feeding unit
DESCRIPTION OF SYMBOLS 3 Power conditioner 9 Charging / discharging amount measurement part 4 Electricity meter 10 Storage battery 5 Commercial power supply system 11 Wind power generation part 6 Charging apparatus

Claims (13)

A charging device connected in parallel with the PCS to an input portion of a power conditioner (PCS) of a power generator utilizing natural energy, and connected in series with a storage battery,
A low voltage detector that detects an operating voltage range of the PCS and determines that the operating voltage is less than a predetermined value;
When the operating voltage is greater than or equal to a predetermined value, the input DC circuit of the PCS and the storage battery are not electrically connected, and when the operating voltage is determined to be less than the predetermined value, the input side of the PCS A charging device comprising a relay with a contact for electrically connecting a DC circuit and the storage battery.   The charging device according to claim 1, further comprising: an AND circuit in which the low voltage detector is electrically connected in parallel with an out-of-range condition contact of the internal control unit of the PCS and / or a sunshine meter. Charging device characterized.   The charging device according to claim 1 or 2, further comprising: a capacitor that integrates a differential change output of the operating voltage and accumulates charging power when the operating voltage is equal to or lower than a predetermined value; A charging device provided on the output side.   The charging device according to any one of claims 1 to 3, further for preventing a backflow of current from the storage battery on an output side of a DC / DC converter (DC / DC converter) included in the charging device. A charging device comprising a backflow prevention diode.   The charging device according to claim 1, wherein the power generation device that utilizes natural energy is a solar power generation device. A method of charging a storage battery with power generated by a power generation device that utilizes natural energy,
Detecting an operating voltage range of a power conditioner (PCS) of the power generator, and determining that the operating voltage is less than a predetermined value;
When the operating voltage is greater than or equal to a predetermined value, the input side DC circuit of the PCS and the storage battery are not electrically connected, and when the operating voltage is determined to be less than the predetermined value, And charging the storage battery with electric power from the power generation device by electrically connecting the input-side DC circuit and the storage battery. The charging method according to claim 6 further includes a step of confirming the presence / absence of the operation of the PCS and / or the amount of sunshine by the contact outside the operating range of the internal control unit of the PCS and / or a sunshine meter. Have
In the step of charging power from the power generator to the storage battery, the operating voltage is determined to be less than a predetermined value, the PCS is not operating, and the amount of sunshine is less than a predetermined value. When at least any one of these is confirmed, the DCS input side DC circuit and the storage battery are electrically connected to each other.   The charging method according to claim 6 or 7, wherein the power generation device utilizing the natural energy is a solar power generation device. A power generation device that utilizes natural energy including a power conditioner (PCS), the charging device according to any one of claims 1 to 5, a storage battery, and the charging device and the storage battery are electrically disposed. And a charge / discharge amount measuring unit that detects and displays a remaining capacity of the storage battery by providing a current detector at an external terminal of the storage battery.   The power supply system according to claim 9 is further electrically connected and connected between the charging device and the charge / discharge amount measuring unit, and signals for starting and stopping are supplied to the charge / discharge detecting unit. An AC power supply unit for converting the direct current from the storage battery into alternating current and generating power to the commercial power system while controlling the remaining amount of storage of the storage battery by interlocking with data stored in the storage battery And power supply system.   The power supply system according to claim 10 is further electrically connected and connected between the charging device and the charge / discharge amount measuring unit, and converts an AC voltage from a commercial power system into an AC / DC converter. A power supply system comprising: an AC power supply unit for supplying power to the storage battery by means of a battery.   A method for measuring a remaining capacity of the storage battery provided in the power supply system according to claim 9, wherein the storage battery is electrically arranged and connected between the charging device and the storage battery. From the step of detecting the current at the time of charging / discharging by the current detector provided in the external terminal portion of the storage battery, the step of acquiring the charge amount and the discharge amount as respective cumulative integral values, and the cumulative integral value of the charge amount A process for subtracting a cumulative integral value of the discharge amount to calculate a remaining capacity value of the storage battery, and a process for displaying the remaining capacity value, and measuring the remaining amount of power stored in the power supply system Method.   In the current value at the time of charge or discharge obtained from the current detector, the accumulated capacity (ΣAh) of current (A) × time (h) at the time of charge is less than 1 and is a correction value (k) of 0.8 or more ), And the integrated capacity (ΣAh) of current (A) × time (h) during discharge is directly measured as ΣAh. A method for measuring the remaining amount of electricity stored in a power supply system.

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