Charging control system

Abstract

To provide a low-cost charging control system that has a reverse power flow detection function and a charge amount detection function using only an ammeter.SOLUTION: A charging control system 10 is composed of a solar-side current sensor 101 that measures the current value of a power line 80 connected from a power conditioner 21 to a distribution board 40, a grid-side current sensor 102 that measures the current value of a power line 81 that is connected from a power grid 30 to a distribution board 40 on the consumer's premises, a battery-side current sensor 105 that measures the current value of a power line 83 that is connected from a relay device 104 to a storage battery 50, a control device 103 that acquires the current values measured by each of the above sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the reverse power flow rate and charging amount, determines whether to charge the storage battery 50, and outputs a charging command to the relay device 104, and the relay device 104 that receives a charging command from the control device 103 and controls the ON / OFF of charging to the storage battery 50.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a charge control system, a charge control method, and a charge control program that are capable of detecting reverse power flow and detecting a charge amount using only an ammeter. [Background technology]

[0002] Patent Document 1 discloses a power monitoring system in which a reverse power flow sensor provided to detect reverse power flow comprises, for a single-phase three-wire power system, two ammeters (current sensors) that detect AC currents in two voltage lines, and two voltmeters that detect AC voltages between each voltage line and the neutral line. The reverse power flow sensor is equipped with a calculation unit that calculates active power based on the phase difference between the AC voltage detected by the voltmeter and the AC current detected by the ammeter, and determines whether or not reverse power flow is occurring based on the value of the active power. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-74637 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, systems that link solar power generation systems with power storage systems have come into practical use. However, it is also true that such systems are difficult for ordinary households to install and are expensive. In addition, due to the end of the FIT issue (the end of the fixed price purchase system), rising electricity prices, and growing interest in carbon neutrality, there is a growing need to charge solar-generated electricity into general-purpose storage batteries for self-consumption.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a charging control system, a charging control method, and a charging control program at low cost that have the functions of detecting reverse power flow and detecting the amount of charge using only an ammeter. [Means for solving the problem]

[0006] The charging control system according to the present invention comprises: The power lines connected from the power conditioner to the distribution board a sunlight-side current sensor U that measures the current value of the voltage line U and a sunlight-side current sensor W that measures the current value of the voltage line W; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor U that measures a current value of a voltage line U and a grid-side current sensor W that measures a current value of a voltage line W; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and turns charging to the storage battery on and off; It consists of The control device Process 1 converts the current values measured by the solar-side current sensor U and the solar-side current sensor W from analog values to digital values (Isu, Isw) and takes them in; Process 2 converts the current values measured by the grid side current sensor U and the grid side current sensor W from analog values to digital values (Ipu, Ipw) and takes them in; Process 3 stores all samplings of Isu, Isw, Ipu, and Ipw during a predetermined period; Process 4 counts the number of samples (Cpu, Cpw) where a phase difference occurs in the current value only (Isu and Ipu, Isw and Ipw) from all the stored samples. A process 5 counts the number of samples (Cnt) of each current value (Isu, Isw, Ipu, Ipw) in each predetermined period; A decision 1 that determines whether the sampling of the current value has exceeded a predetermined period and branches to either process 6 or process 1; A process 6 calculates the phase difference from the ratio of the number of samples (Cnt) in a predetermined cycle to the number of samples (Cpu, Cpw) in which a phase difference occurs, and calculates the power factor (Fpu, Fpw) of the voltage line of the power line from the power system to the distribution board; Process 7: Calculating the effective current values (Iru, Irw) of the voltage line of the power line by taking the square root of the average of twice the square of each instantaneous value of Ipu and Ipw; Process 8 calculates the reverse power flow rate based on the effective current values (Iru, Irw) and power factors (Fpu, Fpw); A process 9 converts the current value (analog value) measured by the battery-side current sensor into a digital value (Ic), calculates the effective current value (Irc) of the power line by taking the square root of the average of twice the square of the instantaneous value of Ic, and calculates the charge amount. Decision 2 compares the reverse power flow rate and the charge amount and makes a charge decision (ON / OFF decision); If the condition for charging determination in determination 2 is satisfied, a process 10 of turning on the relay device to connect the outlet and the storage battery and charging the storage battery; The present invention is characterized by carrying out the following.

[0007] The charge control method according to the present invention comprises: The power lines connected from the power conditioner to the distribution board a sunlight-side current sensor U that measures the current value of the voltage line U and a sunlight-side current sensor W that measures the current value of the voltage line W; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor U that measures a current value of a voltage line U and a grid-side current sensor W that measures a current value of a voltage line W; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and turns charging to the storage battery on and off; In a charging control system consisting of The control device Process 1 converts the current values measured by the solar-side current sensor U and the solar-side current sensor W from analog values to digital values (Isu, Isw) and takes them in; Process 2 converts the current values measured by the grid side current sensor U and the grid side current sensor W from analog values to digital values (Ipu, Ipw) and takes them in; Process 3 stores all samplings of Isu, Isw, Ipu, and Ipw during a predetermined period; Process 4 counts the number of samples (Cpu, Cpw) where a phase difference occurs in the current value only (Isu and Ipu, Isw and Ipw) from all the stored samples. A process 5 counts the number of samples (Cnt) of each current value (Isu, Isw, Ipu, Ipw) in each predetermined period; A decision 1 that determines whether the sampling of the current value has exceeded a predetermined period and branches to either process 6 or process 1; A process 6 calculates the phase difference from the ratio of the number of samples (Cnt) in a predetermined cycle to the number of samples (Cpu, Cpw) in which a phase difference occurs, and calculates the power factor (Fpu, Fpw) of the voltage line of the power line from the power system to the distribution board; Process 7: Calculating the effective current values (Iru, Irw) of the voltage line of the power line by taking the square root of the average of twice the square of each instantaneous value of Ipu and Ipw; Process 8 calculates the reverse power flow rate based on the effective current values (Iru, Irw) and power factors (Fpu, Fpw); A process 9 converts the current value (analog value) measured by the battery-side current sensor into a digital value (Ic), calculates the effective current value (Irc) of the power line by taking the square root of the average of twice the square of the instantaneous value of Ic, and calculates the charge amount. Decision 2 compares the reverse power flow rate and the charge amount and makes a charge decision (ON / OFF decision); If the condition for charging determination in determination 2 is satisfied, a process 10 of turning on the relay device to connect the outlet and the storage battery and charging the storage battery; The charging of the storage battery is controlled by executing the above.

[0008] The charge control program according to the present invention comprises: The power lines connected from the power conditioner to the distribution board a sunlight-side current sensor U that measures the current value of the voltage line U and a sunlight-side current sensor W that measures the current value of the voltage line W; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor U that measures a current value of a voltage line U and a grid-side current sensor W that measures a current value of a voltage line W; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and turns charging to the storage battery on and off; In a charging control system consisting of The control device, Process 1 converts the current values measured by the solar-side current sensor U and the solar-side current sensor W from analog values to digital values (Isu, Isw) and takes them in; Process 2 converts the current values measured by the grid side current sensor U and the grid side current sensor W from analog values to digital values (Ipu, Ipw) and takes them in; Process 3 stores all samplings of Isu, Isw, Ipu, and Ipw during a predetermined period; Process 4 counts the number of samples (Cpu, Cpw) where a phase difference occurs in the current value only (Isu and Ipu, Isw and Ipw) from all the stored samples. A process 5 counts the number of samples (Cnt) of each current value (Isu, Isw, Ipu, Ipw) in each predetermined period; A decision 1 that determines whether the sampling of the current value has exceeded a predetermined period and branches to either process 6 or process 1; A process 6 calculates the phase difference from the ratio of the number of samples (Cnt) in a predetermined cycle to the number of samples (Cpu, Cpw) in which a phase difference occurs, and calculates the power factor (Fpu, Fpw) of the voltage line of the power line from the power system to the distribution board; Process 7: Calculating the effective current values (Iru, Irw) of the voltage line of the power line by taking the square root of the average of twice the square of each instantaneous value of Ipu and Ipw; Process 8 calculates the reverse power flow rate based on the effective current values (Iru, Irw) and power factors (Fpu, Fpw); A process 9 converts the current value (analog value) measured by the battery-side current sensor into a digital value (Ic), calculates the effective current value (Irc) of the power line by taking the square root of the average of twice the square of the instantaneous value of Ic, and calculates the charge amount. Decision 2 compares the reverse power flow rate and the charge amount and makes a charge decision (ON / OFF decision); If the condition for charging determination in determination 2 is satisfied, a process 10 of turning on the relay device to connect the outlet and the storage battery and charging the storage battery; The present invention is characterized in that the following is executed. [Effects of the Invention]

[0009] The charging control system of the present invention can provide a mechanism that contributes to reducing electricity bills by enabling ordinary households to inexpensively charge their batteries during reverse power flow by linking it with, for example, a reasonable general-purpose storage battery (such as a portable power source).In addition, by effectively utilizing existing resources (such as existing power distribution lines and outlets in the home), it aims to achieve convenience and resource conservation. [Brief explanation of the drawings]

[0010] [Figure 1] Overall diagram showing an embodiment of a charging control system [Figure 2] Diagram explaining the functions of the charging control system [Figure 3]FIG. 10 is a diagram illustrating a phase difference due to only a positive waveform. [Figure 4] FIG. 10 is a diagram illustrating a program processing flow. DETAILED DESCRIPTION OF THE INVENTION

[0011] FIG. 1 is a configuration diagram showing an embodiment of a charging control system 10. As shown in FIG. The power system 30 is connected to a distribution board 40 in the customer's premises via a power line 81 (single-phase three-wire system). The solar cell 20 is connected to a power conditioner (indicated as "PCS" in the figure) 21 via a power line, and the power conditioner 21 is connected to a distribution board 40 via a power line 80 (single-phase three-wire system). In the embodiment, it is assumed that the consumer is an ordinary household. The distribution board 40 is connected to the storage battery 50 via a power line 82, a relay device 104 (shown in the figure as an "SSL (solid state relay)"; zero-cross type), and a power line 83, and is connected to an electrical load 60 or directly to an electrical load 70. The power conditioner 21 converts the DC power generated by the solar cell 20 into AC power and supplies it to the distribution board 40 . The AC power supplied to the distribution board 40 is supplied from the storage battery 50 to the electrical load 60 via the power line 82, the relay device 104, and the power line 83, or directly to the electrical load 70, and is also supplied as a reverse power flow to the power grid 30.

[0012] The storage battery 50 is assumed to be a general-purpose storage battery (such as a portable power supply), and is assumed to be connected to various electrical loads 60 to consume power. It is also assumed that the storage battery 50 has a pass-through charging function (capable of simultaneously charging and discharging), and that charging by the charge control system 10 and discharging by the electrical load 60 are performed simultaneously.

[0013] FIG. 2 is a diagram for explaining the function of the charging control system 10. As shown in FIG. The charging control system 10 is composed of a solar-side current sensor 101, a grid-side current sensor 102, a control device 103, a relay device 104, and a storage battery-side current sensor 105.

[0014] The sunlight-side current sensor 101 is made up of two sensors: a sunlight-side current sensor U1011 and a sunlight-side current sensor W1012. The system side current sensor 102 is made up of two sensors, a system side current sensor U1021 and a system side current sensor W1022. The solar light side current sensor 101, the grid side current sensor 102, and the storage battery side current sensor 105 are assumed to be general-purpose clamp-type current sensors. Furthermore, the solar-side current sensor 101 and the grid-side current sensor 102 perform phase calculations based on the acquired current values, and therefore are assumed to have the same phase characteristics. It is desirable that the battery side current sensor 105 also has the same phase characteristics.

[0015] The power lines 80 and 81 are assumed to be single-phase three-wire systems, and are each composed of three wires: voltage lines U and W and a non-voltage wire (neutral wire) V. The power line 82 is branched from the distribution board 40 (for example, connected from an existing outlet in the home) and is derived from the voltage line U or the voltage line W.

[0016] The sunlight-side current sensor U1011 measures the current value of the voltage line U of the power line 80. The sunlight-side current sensor W1012 measures the current value of the voltage line W of the power line 80. The system side current sensor U1021 measures the current value of the voltage line U of the power line 81. The system side current sensor W1022 measures the current value of the voltage line W of the power line 81. The battery-side current sensor 105 measures the current value of the power line 83 .

[0017] The control device 103 acquires each current value, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery 50 is being charged, and issues a charge command to the relay device 104. The control device 103 is assumed to be a microcomputer or the like and has an analog / digital conversion (hereinafter referred to as A / D conversion) function. The current values acquired by the solar-side current sensor U1011, the solar-side current sensor W1012, the grid-side current sensor U1021, the grid-side current sensor W1022, and the storage battery-side current sensor 105 are input into the control device 103 by an A / D conversion function. Each current value measured by a current sensor shows a waveform that alternates between positive and negative values, but the standard A / D conversion function of a microcontroller or the like can capture positive values but may not be able to capture negative values. In this case, one method is to raise the waveform of the current value to only positive values, input it into the control device 103, and calculate the power, effective value, and phase difference, but in this invention, in order to simplify the mechanism and reduce costs, a method is adopted in which only positive values of the current (only half waveforms) are used to calculate the effective value and phase difference. Since negative values of the current value also have the same tendency as positive values, a simple method is adopted. This method can be used even if the A / D conversion function of the microcomputer or the like can take in negative values. In the present invention, since it is sufficient to be able to perform the charging determination described later, a strict power calculation is not performed.

[0018] FIG. 3 shows a processing flow when the charge control system calculates the amount of reverse power flow and determines whether to charge the storage battery 50. Specifically, the amount of reverse power flow is calculated by calculating the phase difference, power factor, and effective current value, which are calculation elements for the amount of reverse power flow.

[0019] In <Process 1>, the control device 103 converts the current values measured by the sunlight-side current sensor U1011 and the sunlight-side current sensor W1012 from analog values to digital values using the A / D conversion function and takes them in. The current values of the captured digital values are Isu and Isw, respectively.

[0020] In <Process 2>, the control device 103 converts the current values measured by the grid side current sensor U1021 and the grid side current sensor W1022 from analog values to digital values using the A / D conversion function and takes them in. The current values of the captured digital values are Ipu and Ipw, respectively.

[0021] In <Process 3>, Isu, Isw, Ipu, and Ipw are stored for all samplings (in this case, about 40 to 50 times) during a predetermined period (about 3 to 4 periods) (to be used in calculating the effective value in <Process 7> later). The number of samples taken during a given period is adjusted by the microcomputer or the like used.

[0022] In <Process 4>, the control device counts the number of samples (Cpu, Cpw) in which a phase difference occurs in only the current values (Isu and Ipu, Isw and Ipw) from all the samples stored in Process 3. The phase difference is counted for samplings that satisfy Isu>0 and Ipu≦0, Isw>0 and Ipw≦0. (a) to (d) in FIG. 4 show the phase difference, and the sampling at the corresponding points is counted. Regarding the current values Ipu and Ipw of the voltage lines U and W of the power line 81, the count numbers are Cpu and Cpw, respectively.

[0023] Although the phase difference can be calculated using the line voltage, in this invention, in order to improve workability and reduce installation costs, the phase difference is calculated using only the current value using the data on Isu and Isw as an alternative to the line voltage. Isu and Isw utilize the operation of the power conditioner 21 to have the same phase as the UV and WV line voltages of the power line 81.

[0024] In <Process 5>, the number of samples of each current value (Isu, Isw, Ipu, Ipw) in each predetermined period is counted (the count number is represented as "Cnt").

[0025] In <Decision 1>, it is determined whether the sampling of each current value (Isu, Isw, Ipu, Ipw) has exceeded each predetermined period (in this embodiment, the number of samplings is 47). If it exceeds the limit, proceed to <Process 6>. If it does not exceed the limit, proceed to <Process 1>.

[0026] In <Process 6>, the power factor is calculated. Specifically, the phase difference is calculated from the ratio of the number of samples (Cnt) in a predetermined cycle to the number of samples (Cpu, Cpw) at which a phase difference occurs, based on the current values (Isu, Isw) measured by the solar-side current sensor, which are substitutes for the line voltage, and the current values (Ipu, Ipw) measured by the grid-side current sensor, and the power factor (Fpu, Fpw) of the voltage line of the power line 81 from the power grid 30 to the distribution board 40 is calculated using the following equation.

[0027] Power factor Fpu of voltage line U of power line 81 from power system 30 to distribution board 40: The cosine of the phase difference (radian) calculated from the ratio of the number of samples in a given cycle (Cnt) to the number of samples in which a phase difference occurs (Cpu)

[0028] Power factor Fpw of voltage line W of power line 81 from power system 30 to distribution board 40: The cosine of the phase difference (radian) calculated from the ratio of the number of samples in a given cycle (Cnt) to the number of samples where a phase difference occurs (Cpw)

[0029] In <Process 7>, the effective current values (Iru, Irw) of the voltage line of the power line 81 are calculated using Ipu and Ipw stored in <Process 3>. Specifically, this is done according to the following formula:

[0030] Voltage of power line 81 and effective current Iru of line U: The square root of the average of twice the square of each instantaneous value of Ipu (※1) (※1)This is because only positive waveform (half waveform) data is captured. When capturing full waveform data, doubling is not necessary.

[0031] Current effective value Irw of voltage line W of power line 81: The square root of the average of twice the square of each instantaneous value of Ipw (※2) (※2)This is because only positive waveform (half waveform) data is captured. When capturing full waveform data, doubling is not necessary.

[0032] In <Process 8>, the amount of reverse power flow is calculated from the effective current values (Iru, Irw) and power factors (Fpu, Fpw). Specifically, it is calculated by the following formula: Reverse flow rate: Iru × Fpu + Irw × Fpw Here, when performing power calculations, the UV and WV line voltages of the power line 81 are taken into consideration, but in the present invention, it is sufficient to be able to perform the charging determination described below, so the UV and WV line voltages of the power line 81 are considered to be approximately the same and are not taken into consideration.

[0033] In <Process 9>, the control device 103 converts the current value measured by the battery side current sensor 105 from an analog value to a digital value (Ic) using the A / D conversion function for a predetermined period (approximately 3 to 4 periods), inputs it, finds the effective current value (Irc) of the power line 83, and calculates the amount of charge. Specifically, the charge amount is calculated by the following formula:

[0034] Effective current Irc (=charge amount) of power line 83: Square root of the average of twice the square of each instantaneous value of Ic (※3) (※3)This is because only positive waveform (half waveform) data is captured. When capturing full waveform data, doubling is not necessary.

[0035] Here, when performing power calculations, the voltage of power line 83 is taken into consideration, but in the present invention, since it is sufficient to perform the charging judgment described below, the voltage of power line 83 is considered to be approximately the same as the line voltages UV and WV of power line 81 and is not taken into consideration. In addition, the power factor is set to 1 (as it is sufficient to prevent charging except during reverse power flow).

[0036] In <Decision 2>, the amount of reverse power flow and the amount of charge are compared to determine whether to charge (ON / OFF). The condition for determining whether charging is necessary is as follows: -1×(Iru × Fpu + Irw × Fpw) > Irc If the condition for determining charging is not met (if "-1 x reverse power flow amount" is equal to or less than the charging amount), the relay device 104 is turned off. That is, when the relay device 104 is OFF, the power outlet and the storage battery 50 are not connected, and therefore the storage battery 50 is not charged.

[0037] Here, for "Iru × Fpu + Irw × Fpw", the direction from the power system 30 to the distribution board 40 is taken as positive. On the other hand, if a reverse power flow occurs, it is considered negative. By including the charge amount Irc in the conditional expression, frequent ON / OFF switching of charging is prevented. If charging is already in progress, Irc is determined to be 0.

[0038] In <Process 10>, if the condition for determining charging in <Decision 2> is met (if "-1 x reverse power amount" is greater than the amount of charging), the control device 103 turns on the relay device 104. That is, when the relay device 104 is ON, the power outlet and the storage battery 50 are connected, and the storage battery 50 is charged.

[0039] The above method can be used even if the A / D conversion function of the microcomputer or the like can take in negative values. Furthermore, the present invention can also be used when a plurality of general-purpose storage batteries are used. If SSL battery-side current sensors are installed for each general-purpose battery, more precise charging control becomes possible, such as determining charging priorities according to the charge amount and reverse current flow rate of each battery, and determining whether to charge multiple batteries simultaneously.

[0040] Furthermore, some general-purpose storage batteries accept a cycle control method (*4) that controls the amount of power (charge amount) from the outlet during charging. In this case, more efficient charging becomes possible by having the control device 103 control the charge amount to within the reverse power flow rate using information on the reverse power flow rate and charge amount calculated by the present invention. Specifically, this can be achieved by changing the ON / OFF ratio of the charge command from the control device 103 to the relay device 104 (SSL, zero-cross method) using information on the reverse power flow rate and charge amount. (*4) This is done by driving the SSR with a trigger signal to the load power supply. By turning the SSR on and off every half cycle of the AC waveform, it is possible to control the power supply while suppressing noise generation.

Claims

1. The power lines connected from the power conditioner to the distribution board a solar-side current sensor that measures a current value; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor that measures a current value; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; In a charging control system consisting of The control device When determining whether to charge the storage battery, A phase difference is calculated from the ratio of the number of samples in a predetermined cycle to the number of samples in which a phase difference occurs, based on the current value measured by the solar-side current sensor and the current value measured by the grid-side current sensor, which are substitutes for the line voltage; a means for calculating a power factor of a voltage line of a power line from the power system to a distribution board in a consumer's premises by using the cosine of the phase difference; means for calculating an effective current value of a voltage line of a power line by taking the square root of the average of twice the square of each instantaneous current value measured by the grid-side current sensor; Calculate the reverse power flow rate by using one of the following calculation methods: A charging control system characterized by:

2. The power lines connected from the power conditioner to the distribution board a solar-side current sensor that measures a current value; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor that measures a current value; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; In a charge control method comprising: The control device When determining whether to charge the storage battery, A phase difference is calculated from the ratio of the number of samples in a predetermined cycle to the number of samples in which a phase difference occurs, based on the current value measured by the solar-side current sensor and the current value measured by the grid-side current sensor, which are substitutes for the line voltage; a means for calculating a power factor of a voltage line of a power line from the power system to a distribution board in a consumer's premises by using the cosine of the phase difference; means for calculating an effective current value of a voltage line of a power line by taking the square root of the average of twice the square of each instantaneous current value measured by the grid-side current sensor; Calculate the reverse power flow rate by using one of the following calculation methods: A charging control method comprising:

3. The power lines connected from the power conditioner to the distribution board a solar-side current sensor that measures a current value; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor that measures a current value; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; In the charging control program consisting of The control device calculates the amount of reverse power flow when determining whether to charge the storage battery, A phase difference is calculated from the ratio of the number of samples in a predetermined cycle to the number of samples in which a phase difference occurs, based on the current value measured by the solar-side current sensor and the current value measured by the grid-side current sensor, which are substitutes for the line voltage; a means for calculating a power factor of a voltage line of a power line from the power system to a distribution board in a consumer's premises by using the cosine of the phase difference; means for calculating an effective current value of a voltage line of a power line by taking the square root of the average of twice the square of each instantaneous current value measured by the grid-side current sensor; Execute any one of the calculation means A charging control program characterized by:

4. The power lines connected from the power conditioner to the distribution board a solar-side current sensor that measures a current value; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor that measures a current value; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; In a charging control system consisting of The control device When determining whether to charge the storage battery, A phase difference is calculated from the ratio of the number of samples in a predetermined cycle to the number of samples in which a phase difference occurs, based on the current value measured by the solar-side current sensor and the current value measured by the grid-side current sensor, which are substitutes for the line voltage; a means for calculating a power factor of a voltage line of a power line from the power system to a distribution board in a consumer's premises by using the cosine of the phase difference; means for calculating an effective current value of a voltage line of a power line by taking the square root of the average of twice the square of each instantaneous current value measured by the grid-side current sensor; Calculate the reverse power flow rate by taking A charging control system characterized by:

5. The power lines connected from the power conditioner to the distribution board a solar-side current sensor that measures a current value; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor that measures a current value; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; In a charge control method comprising: The control device When determining whether to charge the storage battery, A phase difference is calculated from the ratio of the number of samples in a predetermined cycle to the number of samples in which a phase difference occurs, based on the current value measured by the solar-side current sensor and the current value measured by the grid-side current sensor, which are substitutes for the line voltage; a means for calculating a power factor of a voltage line of a power line from the power system to a distribution board in a consumer's premises by using the cosine of the phase difference; means for calculating an effective current value of a voltage line of a power line by taking the square root of the average of twice the square of each instantaneous current value measured by the grid-side current sensor; Calculate the reverse power flow rate by taking A charging control method comprising:

6. The power lines connected from the power conditioner to the distribution board a solar-side current sensor that measures a current value; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor that measures a current value; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; In the charging control program consisting of The control device calculates the amount of reverse power flow when determining whether to charge the storage battery, A phase difference is calculated from the ratio of the number of samples in a predetermined cycle to the number of samples in which a phase difference occurs, based on the current value measured by the solar-side current sensor and the current value measured by the grid-side current sensor, which are substitutes for the line voltage; a means for calculating a power factor of a voltage line of a power line from the power system to a distribution board in a consumer's premises by using the cosine of the phase difference; means for calculating an effective current value of a voltage line of a power line by taking the square root of the average of twice the square of each instantaneous current value measured by the grid-side current sensor; Execute A charging control program characterized by:

7. The power lines connected from the power conditioner to the distribution board a sunlight-side current sensor U that measures a current value of the voltage line U and a sunlight-side current sensor W that measures a current value of the voltage line W; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor U that measures a current value of a voltage line U and a grid-side current sensor W that measures a current value of a voltage line W; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; It consists of The control device A process 1 converts the current values measured by the sunlight-side current sensor U and the sunlight-side current sensor W from analog values to digital values (Isu, Isw) and takes them in; A process 2 converts the current values measured by the grid side current sensor U and the grid side current sensor W from analog values to digital values (Ipu, Ipw) and takes them in; Process 3: storing all samplings of Isu, Isw, Ipu, and Ipw during a predetermined period; Process 4 counts the number of samples (Cpu, Cpw) in which a phase difference occurs in the current values only (Isu and Ipu, Isw and Ipw) from all the stored samples. A process 5 counts the number of samplings (Cnt) of each current value (Isu, Isw, Ipu, Ipw) in each predetermined period; A decision 1 that determines whether the sampling of the current value has exceeded a predetermined period and branches to either process 6 or process 1; A process 6 calculates the phase difference from the ratio of the number of samples (Cnt) in a predetermined period to the number of samples (Cpu, Cpw) in which a phase difference occurs, and calculates the power factor (Fpu, Fpw) of the voltage line of the power line from the power system to the distribution board; Process 7: calculating the effective values of the voltage and current (Iru, Irw) of the power line by taking the square root of the average of twice the squares of the instantaneous values of Ipu and Ipw; Process 8 calculates the reverse power flow rate based on the effective current values (Iru, Irw) and power factors (Fpu, Fpw); A process 9 converts the current value (analog value) measured by the battery-side current sensor into a digital value (Ic), calculates the effective current value (Irc) of the power line by taking the square root of the average of twice the square of the instantaneous value of Ic, and calculates the charge amount. Judgment 2: Compare the reverse power flow rate and the charge amount and make a charge judgment (ON / OFF decision); If the condition for charging determination in determination 2 is satisfied, a process 10 is performed in which the relay device is turned on to connect the outlet and the storage battery and charge the storage battery; A charging control system characterized by performing the above.

8. The power lines connected from the power conditioner to the distribution board a sunlight-side current sensor U that measures a current value of the voltage line U and a sunlight-side current sensor W that measures a current value of the voltage line W; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor U that measures a current value of a voltage line U and a grid-side current sensor W that measures a current value of a voltage line W; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; In a charging control system consisting of The control device A process 1 converts the current values measured by the sunlight-side current sensor U and the sunlight-side current sensor W from analog values to digital values (Isu, Isw) and takes them in; A process 2 converts the current values measured by the grid side current sensor U and the grid side current sensor W from analog values to digital values (Ipu, Ipw) and takes them in; Process 3: storing all samplings of Isu, Isw, Ipu, and Ipw during a predetermined period; Process 4 counts the number of samples (Cpu, Cpw) in which a phase difference occurs in the current values only (Isu and Ipu, Isw and Ipw) from all the stored samples. A process 5 counts the number of samplings (Cnt) of each current value (Isu, Isw, Ipu, Ipw) in each predetermined period; A decision 1 that determines whether the sampling of the current value has exceeded a predetermined period and branches to either process 6 or process 1; A process 6 calculates the phase difference from the ratio of the number of samples (Cnt) in a predetermined period to the number of samples (Cpu, Cpw) in which a phase difference occurs, and calculates the power factor (Fpu, Fpw) of the voltage line of the power line from the power system to the distribution board; Process 7: calculating the effective values of the voltage and current (Iru, Irw) of the power line by taking the square root of the average of twice the squares of the instantaneous values of Ipu and Ipw; Process 8 calculates the reverse power flow rate based on the effective current values (Iru, Irw) and power factors (Fpu, Fpw); A process 9 converts the current value (analog value) measured by the battery-side current sensor into a digital value (Ic), calculates the effective current value (Irc) of the power line by taking the square root of the average of twice the square of the instantaneous value of Ic, and calculates the charge amount. Judgment 2: Compare the reverse power flow rate and the charge amount and make a charge judgment (ON / OFF decision); If the condition for charging determination in determination 2 is satisfied, a process 10 is performed in which the relay device is turned on to connect the outlet and the storage battery and charge the storage battery; A charge control method for controlling charging of a storage battery by executing the above.

9. The power lines connected from the power conditioner to the distribution board a sunlight-side current sensor U that measures a current value of the voltage line U and a sunlight-side current sensor W that measures a current value of the voltage line W; The power lines that connect from the power grid to the distribution board on the customer's premises a grid-side current sensor U that measures a current value of a voltage line U and a grid-side current sensor W that measures a current value of a voltage line W; a battery-side current sensor that measures a current value of a power line connected from the relay device to the battery; a control device that acquires current values measured by the sensors, converts the acquired current values into digital values using an A / D conversion function, calculates the amount of reverse power flow and the amount of charge, determines whether the storage battery is being charged, and issues a charge command to a relay device; a relay device that receives a charging command from the control device and charges the storage battery; In a charging control system consisting of The control device, A process 1 converts the current values measured by the sunlight-side current sensor U and the sunlight-side current sensor W from analog values to digital values (Isu, Isw) and takes them in; A process 2 converts the current values measured by the grid side current sensor U and the grid side current sensor W from analog values to digital values (Ipu, Ipw) and takes them in; Process 3: storing all samplings of Isu, Isw, Ipu, and Ipw during a predetermined period; Process 4 counts the number of samples (Cpu, Cpw) in which a phase difference occurs in the current values only (Isu and Ipu, Isw and Ipw) from all the stored samples. A process 5 counts the number of samplings (Cnt) of each current value (Isu, Isw, Ipu, Ipw) in each predetermined period; A decision 1 that determines whether the sampling of the current value has exceeded a predetermined period and branches to either process 6 or process 1; A process 6 calculates the phase difference from the ratio of the number of samples (Cnt) in a predetermined period to the number of samples (Cpu, Cpw) in which a phase difference occurs, and calculates the power factor (Fpu, Fpw) of the voltage line of the power line from the power system to the distribution board; Process 7: calculating the effective values of the voltage and current (Iru, Irw) of the power line by taking the square root of the average of twice the squares of the instantaneous values of Ipu and Ipw; Process 8 calculates the reverse power flow rate based on the effective current values (Iru, Irw) and power factors (Fpu, Fpw); A process 9 converts the current value (analog value) measured by the battery-side current sensor into a digital value (Ic), calculates the effective current value (Irc) of the power line by taking the square root of the average of twice the square of the instantaneous value of Ic, and calculates the charge amount. Judgment 2: Compare the reverse power flow rate and the charge amount and make a charge judgment (ON / OFF decision); If the condition for charging determination in determination 2 is satisfied, a process 10 is performed in which the relay device is turned on to connect the outlet and the storage battery and charge the storage battery; A charging control program characterized by executing the above.

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