KR20190057716A - Photovoltaic connected electric energy storage system, charging and discharging control method the same - Google Patents

Abstract

Disclosed are a PV power generation-linked electric energy storage system and a charge/discharge control method therefor. A PV power generation-linked electric energy storage system according to an embodiment of the present invention comprises: a PV power generation unit for generating electric energy by PV power generation; an energy management control unit for generating and outputting charge/discharge control signals for controlling charge/discharge of a battery unit by using an amount of electric energy generated in real time in the PV power generation unit, past PV power generation variation data, and charge/discharge efficiency data; and a charge/discharge control unit for charging the battery unit with electric energy from the PV power generation unit and electric energy from a grid power terminal in response to the charge/discharge control signal, or discharging the electric energy charged in the battery unit to the grid power terminal. The charge/discharge of the battery is controlled by referring, in real time, to charge/discharge efficiency of the charge/discharge control unit and PV power generation variation, thereby improving the accuracy and efficiency thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to a photovoltaic power generation electric energy storage system, and a charge / discharge control method thereof. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

The present invention relates to a photovoltaic power generation electric energy storage system capable of improving the accuracy and efficiency by controlling charge / discharge of a battery in consideration of photovoltaic generation fluctuation amount and charge / discharge efficiency of a charge / And a charge / discharge control method thereof.

The photovoltaic power generation system can be classified into a stand-alone power generation system that transmits electric energy developed in real time to the grid, and a grid-connected power generation system that charges electric power generated by the battery and transfers the electric energy to the grid as needed.

Photovoltaic power-linked electric energy storage system must be built to control solar power generation to charge the battery and discharge it if necessary.

In the photovoltaic power-linked electric energy storage system, the electric energy generated by the photovoltaic generation is stored in the battery in association with the power system (GRID). Conversely, electrical energy storage systems also transmit electrical energy stored in the battery to the power system. In addition, if necessary, the electric energy from the electric power system is stored in the battery and is transmitted to the electric power system again.

For organic electrical energy transfer control between photovoltaic power generation storage systems and power systems, the most important requirements are accuracy and efficiency.

In terms of accuracy, the electrical energy charged into the electrical energy storage system must not exceed the photovoltaic power. If a predetermined problem occurs such that the charge / discharge control command is delayed in accordance with the solar power generation measurement interval and the error of the control command cycle, and the electric energy charged in the battery exceeds the solar photovoltaic power, Since the power input from the system also proceeds, the stability of the power system is affected. In addition, the stability can be maintained by controlling the amount of discharge at a line that does not exceed the maximum capacity of a load or the like associated with the system even during discharging.

On the other hand, in terms of efficiency, the charge / discharge efficiency of the charge / discharge control device for charging / discharging electric energy to / from the battery can be more accurately and stably transferred.

As described above, in order to control the organic electrical energy transfer between the power system and the photovoltaic power generation system, a control algorithm that can improve both accuracy and efficiency is needed.

However, conventionally, since the solar power generation amount is measured only according to the preset control period and schedule and the charge / discharge of the battery is controlled, there is a limit to maintain the stability and increase the efficiency.

In particular, the conventional energy storage system ignores the energy absorption at the power system side due to the intermittent fluctuation of the power generation amount, which is a characteristic of the solar power generation, and recharges the battery or wastes the maximum capacity of the battery due to the empirical value And the like. All of these fail to efficiently operate the energy storage system and cause economic losses.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for controlling the charging / discharging of a battery by reflecting solar battery power variation data and charge / discharge efficiency data of a charge / And more particularly, to a solar energy-linked electric energy storage system capable of further improving a solar cell power generation efficiency and a charge / discharge control method thereof.

According to an aspect of the present invention, there is provided a photovoltaic generation electric energy storage system including a PV power generation unit for generating electric energy by solar power generation, an electric energy generation amount generated in real time in the PV power generation unit, Discharge control signal for controlling the charge / discharge of the battery unit using the PV power fluctuation data of the past and the charge / discharge efficiency data, and a charge / And a charge / discharge control unit charging the battery unit with electric energy from the power generation unit and the system power terminal, or discharging the electric energy charged in the battery unit to the system power stage.

According to another aspect of the present invention, there is provided a method for controlling charge / discharge of a solar energy-generating electric energy storage system, including: generating electric energy by solar power generation; Generating and outputting a charge / discharge control signal for controlling charge / discharge of the battery section using the photovoltaic generation variation data and the charge / discharge efficiency data, and generating and outputting charge / Charging the battery unit with electrical energy from the system power stage or discharging the electrical energy charged in the battery unit to the system power stage.

The solar energy-linked electric energy storage system and its charge / discharge control method according to the embodiments of the present invention having the above-described various technical features are applicable to the solar energy generation variation data of the past and the charge / discharge Efficiency data is reflected in real time so that charge / discharge of the battery can be controlled. Accordingly, it is possible to further improve the accuracy and efficiency of the photovoltaic power generation electric energy storage system and to enhance the reliability thereof.

Further, by optimizing the operation of the solar energy-linked electric energy storage system, it is possible to prevent economic loss from occurring.

FIG. 1 is a block diagram specifically illustrating a photovoltaic power generation type electric energy storage system according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a block diagram specifically showing the energy management controller shown in FIG. 1. FIG.
FIG. 3 is a diagram illustrating a method for detecting the maximum variation of generated power to set the charge / discharge buffer capacity in the buffer setting unit shown in FIG. 2. FIG.
FIG. 4 is a graph showing a battery charge buffer amount and a charge amount change set in the buffer setting unit of FIG. 2. FIG.
FIG. 5 is a graph showing changes in the amount and discharge amount of the battery unit discharge buffer set in the buffer setting unit of FIG. 2. FIG.
6 is a graph showing charge / discharge efficiency change data of the charge / discharge controller shown in FIG.
7 is a view for explaining a charge / discharge amount detection reference setting and an efficiency applying method of the charge / discharge control unit shown in FIG.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram specifically illustrating a photovoltaic power generation type electric energy storage system according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 1, the photovoltaic power generation system of the present invention includes a PV power generation unit 100, a PV inverter 110, a power generation amount measurement unit 200, an energy management control unit 300, a charge / discharge control unit 400, and a battery unit 410.

The PV power generation unit 100 generates electric energy by solar power generation using a plurality of solar cells (PV) or the like. Specifically, the PV power generation unit 100 includes a plurality of solar cells PV, and generates power generation electric power, that is, electric energy using each of the solar cells.

Accordingly, the PV inverter 110 converts the electric energy generated from each PV power generation unit 100 into a direct current or alternating current type using a power conversion device such as an inverter. The electric power generated by the energy management control unit 300 or the charge / discharge control unit 400 is transferred to the battery unit 410, the grid power unit 500, or the load (not shown).

In the case of the PV power generation unit 100, it is possible to replace with other power generation sources and it is possible to use renewable energy sources such as wind power, solar heat, small hydro power and bio. However, considering the noise, It is desirable to use solar cells (PV) as power sources that can be used in homes.

The PV inverter 110 is a hybrid power control device, and the DC voltage of the PV power generation unit 100 can be converted to a DC link voltage through a converter. In order for the electric energy of the PV generator 100 to be transmitted to the grid power stage 500 or a load, it may be converted into an AC voltage through an inverter and supplied. To this end, the hybrid power control apparatus may include at least one inverter, a converter, and the like.

The power generation amount measurement unit 200 measures the amount of electric energy generated by the PV power generation unit 100 in real time and transmits the measured amount of electric energy generated in real time to the energy management control unit 300.

The energy management controller 300 generates a charge / discharge control signal for controlling the charge / discharge of the battery unit 410 using the electric energy generation amount measured in real time, the past photovoltaic generation variation data, and the charge / . The charge / discharge control signal is transmitted to the charge / discharge controller 400.

Specifically, the energy management controller 300 extracts and analyzes past solar power generation variation data by a predetermined period, and detects the maximum variation of the developed electrical energy within a predetermined period. Then, the detected maximum fluctuation amount is reflected in the electric energy generation amount measured in real time, and the charging and discharging buffer capacities of the battery unit 410 are set and changed in real time.

Then, the energy management controller 300 calculates the efficiency value corresponding to the electric energy generation amount measured in real time using the charge / discharge efficiency data of the charge / discharge controller 400. [ The charge / discharge control signal for controlling the charge / discharge amount of the battery unit 410 is generated by reflecting the calculated efficiency value in real time.

The charge / discharge control unit 400 may be a PCS (Power Control System) device. The charge / discharge control unit 400 responds to the charge / discharge control signal input from the energy management control unit 300, 410 in real time. In other words, the charge / discharge control unit 400 charges the battery unit 410 with the electric energy from the PV power generation unit 100 and the electric power from the system power stage 500 in response to the charge / discharge control signal , And discharges the electric energy charged in the battery unit 410 to the system power terminal 500 or a load (not shown).

The battery unit 410 may include at least one battery that can confirm the state of charge (SOC). For example, the battery unit 410 includes a battery such as LiB / RFB, and various sensors for measuring SOC and OCV (Open Circuit Voltage) of the battery may be additionally configured. The battery unit 410 may charge the electric energy from the PV generator 100 and the grid power stage 500 to the own battery under the control of the charge and discharge controller 400, ). ≪ / RTI >

Specifically, when the charge control signal is inputted from the charge / discharge control unit 400, the battery unit 410 charges the internal / external battery with electric energy input from the PV power generation unit 100 and the grid power stage 500 . Meanwhile, when the discharge control signal is inputted from the charge / discharge control unit 400, the battery unit 410 discharges electric energy of the battery so that electric energy discharged is transferred to the load or the grid power stage 500.

The grid power stage 500 may be a power management entity that distributes and supplies power to the plant, or a power grid authority. The system power stage 500 also transfers electrical energy to the battery unit 410 or a separate load or receives electrical energy from the battery unit 410.

FIG. 2 is a block diagram specifically showing the energy management controller shown in FIG. 1. FIG.

The energy management controller 300 shown in FIG. 2 includes a database 310, a buffer setting unit 320, and a control signal generator 330.

The database 310 stores and accumulates electrical energy generation amount information measured in real time by the power generation amount measuring unit 200 to generate and share past solar power generation variation data.

The buffer setting unit 320 analyzes past solar power generation variation data and sets and changes the charging and discharging buffer capacities of the battery unit 410 in real time using the analyzed result and the electric energy generation amount information measured in real time .

The control signal generator 330 generates a charge / discharge control signal for controlling the charge / discharge amount of the battery unit 410 in real time using the charge and discharge amount of the battery unit 410 and charge / discharge efficiency data do.

The buffer setting unit 320 of FIG. 2 includes a maximum variation detecting unit 321 and a buffer calculating unit 322 for setting and changing the charging and discharging buffer capacities of the battery unit 410 in real time.

The maximum variation detecting unit 321 extracts and analyzes past solar power variation data by a predetermined period and detects the maximum variation of electric energy developed within a predetermined period.

Then, the buffer calculation unit 322 sets the charge and discharge buffer capacities of the battery unit 410 in real time by reflecting the detected maximum fluctuation amount in the electric energy generation amount measured in real time or the charge / discharge amount of the battery unit 410, Change it.

FIG. 3 is a diagram illustrating a method for detecting the maximum variation of generated power to set the charge / discharge buffer capacity in the buffer setting unit shown in FIG. 2. FIG.

Referring to FIG. 3, the maximum variation detecting unit 321 can extract and analyze past solar power variation data by a predetermined period, and detect the maximum variation of electric energy developed within a predetermined period. For example, the preset period may be a time zone (st1 to st7) designated on each day of the past seven days (1day to 7day).

Specifically, as shown in FIG. 3, the maximum fluctuation amount detecting unit 321 sets the period (7 days) of the past 7 days from the current date and sets the current fluctuation amount of the current 7 days (1day to 7day) (1h to 1h), the maximum variation of the electric energy developed within a total of 14 hours can be detected by designating one hour before and after the same time (1st to 7th) every day (0h to 2h).

)은 하기의 수학식 1을 이용해 검출할 수 있다. Here, the maximum variation amount of the electric energy developed within the predetermined time period (MAX Ramp rate,

) Can be detected using the following equation (1).

[Equation 1]

Here, P _pv (t) is the electric energy generation amount at time t, P _PV (t-t) is the electric energy generation amount at time t, and the electric energy generation amount difference value at all time points t. And P ^* is the rated output of the charge / discharge controller 400. [ Particularly, the time t may be a solar power generation scan interval (for example, one minute to one hour interval) of the PV power generation unit 100.

FIG. 4 is a graph showing a battery charge buffer amount and a charge amount change set in the buffer setting unit of FIG. 2. FIG. And FIG. 5 is a graph showing changes in the amount and discharge amount of the battery unit discharge buffer set in the buffer setting unit of FIG.

)을 실시간으로 계측되는 전기 에너지 발전량(P_pv)에 반영하여, 실시간으로 배터리부(410)의 충전량(P_bat,chg), 방전량(P_bat,dchg), 및 버퍼 용량(P_pv×buffer)을 설정 및 변경한다. 4 and 5, the buffer calculation unit 322 calculates a maximum variation amount (MAX Ramp rate,

(P_bat, dchg) and the buffer capacity (P_pv × buffer) of the battery unit 410 in real time by reflecting the electric energy generation amount P_pv measured in real time to the electric energy generation amount P_pv measured in real time Change it.

Here, the buffer calculation unit 322 can calculate the buffer capacity Buffer (t) in real time using the following equation (2).

&Quot; (2) "

Here, the MAX ramp rate is the maximum variation detected by the buffer calculator 322. In particular, in order to prevent excessive buffer value calculation due to the measurement error, a value exceeding 200% of the variation amount average within the detection period of 14 hours among the maximum variation value within a predetermined period (for example, 7 days) is not applied as the buffer value .

The control signal generator 330 shown in FIG. 2 controls the charge / discharge control for controlling the charge / discharge amount of the battery unit 410 in real time using the electrical energy generation amount measured in real time and the charge / Signal.

The control signal generating unit 330 generates the charge amount P_bat and chg and the discharge amounts P_bat and dchg of the battery unit 410 in consideration of the charge and discharge buffer capacity P_pv × buffer calculated by the buffer calculation unit 322, Can be calculated. In this case, the charged amount (P_bat, chg) of the battery unit 410 can be calculated using the following equation (3). At this time, there is no power input from the power terminal of the system, and the value of the buffer should be a positive value.

&Quot; (3) "

P_bat, chg = P_pv x (1-buffer)

On the other hand, the discharge amount (P_bat, dchg) of the battery unit 410 can be calculated using the following equation (4). Similarly, the value of the buffer must be a positive value.

&Quot; (4) "

Pbat, dchg = P_grid, limit - P_pv x (1 + buffer)

The control signal generator 330 includes an efficiency calculator 331, a charge amount setting controller 332, and a charge controller 330. The charge calculator 330 calculates a charge / discharge amount of the battery unit 410 using the electric energy generation amount and charge / discharge efficiency data measured in real time, (332), and a discharge amount setting control unit (332).

The efficiency calculation unit 331 calculates the efficiency value corresponding to the electric energy generation amount measured in real time using the charge / discharge efficiency data of the charge / discharge control unit 400.

The charging amount setting control unit 332 reflects the efficiency value calculated by the efficiency calculation unit 331 in real time and generates a charging control signal for controlling the charging amount of the battery unit 410. [ The charge control signal is transmitted to the charge / discharge controller 400.

The discharge amount setting control unit 332 reflects the efficiency value calculated by the efficiency calculation unit 331 in real time and generates a discharge control signal for controlling the discharge amount of the battery unit 410. [ The discharge control signal is transmitted to the charge / discharge controller 400.

6 is a graph showing charge / discharge efficiency change data of the charge / discharge controller shown in FIG.

The efficiency calculation unit 331 calculates the efficiency values corresponding to the charging and discharging amounts of the battery unit 410 using the charge / discharge efficiency data of the charge / discharge control unit 400 shown in FIG.

The charge / discharge efficiency data may be data provided by a manufacturer of a PCS (Power Control System) device configured in the charge / discharge controller 400. The charge / discharge efficiency data are data that compares the efficiency values corresponding to the charge / discharge amounts in consideration of the losses caused by the charge / discharge amounts during charge / discharge control operations of the respective PCS devices.

As shown in FIG. 6, the efficiency of the PCS is varied by the input power W and the voltage V. FIG. 6 (a), 6 (b) and 6 (c) are input voltages, and the x-axis is the input power W value. For example, the efficiency value?, Efficiency may be different according to the input power W in view of c (V) = 460V, b (V) = 480V, a (V) = 495V. In the present invention, the charge / discharge command value is estimated in consideration of this point, and converted into a value considering the efficiency according to the charge / discharge amount calculation reference point.

Specifically, the efficiency calculation unit 331 calculates the discharge amount (P_bat, dchg) and the charge amount (P_bat, dchg) of the battery unit 410 calculated in consideration of the charge and discharge buffer capacity (P_pv_buffer) calculated by the buffer calculation unit 322, the efficiency value eta corresponding to the discharge amount (P_bat, dchg) and the charged amount (P_bat, chg) of the battery unit 410 is calculated by associating the charging / discharging efficiency data with the charging / discharging efficiency data.

The charge amount setting control unit 332 generates a charge control signal for controlling the charge amount of the battery unit 410 by reflecting the efficiency value η calculated by the efficiency calculation unit 331 in real time on the charge amount of the battery unit 410 .

On the other hand, the discharge amount setting control unit 332 controls the discharge amount of the battery unit 410 to control the discharge amount of the battery unit 410 by reflecting in real time the efficiency value η calculated by the efficiency calculation unit 331 Thereby generating a discharge control signal.

7 is a view for explaining a charge / discharge amount detection reference setting and an efficiency applying method of the charge / discharge control unit shown in FIG.

7, when the charged amount P_bat, dchg and the discharged amount P_bat, dchg of the battery unit 410 are measured, the measurement reference point may be the front end A of the charge / discharge control unit 400 And may be the rear end B of the charge / discharge control unit 400 and the front end of the battery unit 410. [

The charge amount setting control unit 332 and the discharge amount setting control unit 332 determine whether the charge amount and the discharge amount measurement reference point of the battery unit 410 are the front end A of the charge / discharge control unit 400, The higher efficiency value can be compensated for than the case where the reference point is the rear end (B) of the charge / discharge controller 400.

[Table 1]

The charge amount setting control unit 332 calculates the charge amount and the discharge amount when the charge amount and the discharge amount measurement reference point of the battery unit 410 are the front end A of the charge / discharge control unit 400, The charge amount control signal can be generated such that the higher efficiency value is compensated for than the case where the measurement reference point is the rear end (B) of the charge / discharge controller 400. [

In Table 1, P_bat and chg are charge amounts of the battery unit 410, and P_bat and dchg are discharge amounts of the battery unit 410. [ The charging efficiency is a charging efficiency (η) calculated by the charging efficiency calculation unit 331. On the other hand, the discharging efficiency is an efficiency value (η) calculated by the efficiency calculation unit 331 during discharging.

As described above, the charge amount setting control unit 332 and the discharge amount setting control unit 332 adjust the compensation amount so that the efficiency value is differentiated according to the charged amount and the discharge amount measurement reference point of the battery unit 410, The compensation efficiency can be further improved according to the discharge amount measurement reference point.

The photovoltaic power generation electric energy storage system and the charge / discharge control method thereof according to the embodiment of the present invention reflect the photovoltaic generation variation data of the past and charge / discharge efficiency data of the charge / discharge control device in real time So that charge / discharge of the battery can be controlled. Accordingly, the accuracy and efficiency of the solar energy-linked electric energy storage system can be further improved and the reliability thereof can be enhanced. In addition, by optimizing the operation of the solar energy-linked electric energy storage system, it is possible to prevent economic loss.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the following claims. It will be possible.

100: PV power generation section
110: PV inverter
200: Power generation amount measuring section
300: Energy management controller
400: charging / discharging control section
410: Battery section
500: grid power stage

Claims (12)

A PV power generating unit for generating electric energy by solar power generation;
Discharge control signal for controlling the charge / discharge of the battery unit using the electric energy generation amount generated in real time in the PV power generation unit, the past solar power generation variation data, and the charge / discharge efficiency data, A management control unit; And
Discharge control signal to charge the battery unit with electric energy from the PV power generation unit and the grid power terminal in response to the charge / discharge control signal, or to discharge the electric energy charged in the battery unit to the grid power stage Comprising a control section
Photovoltaic power - linked electric energy storage system.
The method according to claim 1,
The energy management controller
A database for storing and accumulating electrical energy generation amount information measured in real time to generate and share the past photovoltaic generation variation data;
A buffer setting unit for setting and changing the charging and discharging buffer capacities of the battery unit in real time using analysis results of the past photovoltaic power generation variation data and information on the electric energy generation amount measured in real time; And
And a control signal generation unit for generating the charge / discharge control signal for controlling the charge / discharge amount of the battery unit in real time using the charge and discharge amount of the battery unit and charge / discharge efficiency data,
Photovoltaic power - linked electric energy storage system.
3. The method of claim 2,
The buffer setting unit
A maximum fluctuation amount detecting unit for extracting and analyzing the past photovoltaic generation variation data by a predetermined period and detecting the maximum variation of electric energy developed within a predetermined period; And
And a buffer calculation unit for setting and changing the charge and discharge buffer capacities of the battery unit in real time by reflecting the detected maximum variation amount to the charged amount and the discharged amount of the battery unit
Photovoltaic power - linked electric energy storage system.
3. The method of claim 2,
The control signal generator
An efficiency calculation unit for calculating an efficiency value corresponding to a charged amount and a discharged amount of the battery unit using charge / discharge efficiency data for the charge / discharge control unit;
A charge amount setting control unit for generating a charge control signal for controlling the charge amount of the battery unit by reflecting the efficiency value calculated by the efficiency calculation unit in real time; And
And a discharge amount setting control unit for generating a discharge control signal for controlling the discharge amount of the battery unit by reflecting the efficiency value calculated by the efficiency calculation unit in real time
Photovoltaic power - linked electric energy storage system.
5. The method of claim 4,
The efficiency calculation unit
Discharge efficiency data and the discharge amount and the charge amount of the battery section calculated in consideration of the charge and discharge buffer capacity are respectively associated with the charge and discharge efficiency data, Calculating
Photovoltaic power - linked electric energy storage system.
5. The method of claim 4,
The charge amount setting control unit
When the charge amount and discharge amount measurement reference point of the battery unit is the front end of the charge / discharge control unit, the charge amount control signal is generated so that a higher efficiency value is compensated for than the case where the charge amount and discharge amount measurement reference point is the rear end of the charge / discharge control unit and,
The discharge amount setting control unit
When the charge amount and the discharge amount measurement reference point of the battery section are the front end of the charge / discharge control section, the discharge amount control signal is set to be higher than that when the charge amount and discharge amount measurement reference point is the rear end of the charge / discharge control section Generating
Photovoltaic power - linked electric energy storage system.
Generating electrical energy by solar power generation;
Generating and outputting a charge / discharge control signal for controlling charge / discharge of the battery unit using electric energy generation amount, past photovoltaic generation variation data, and charge / discharge efficiency data; And
Discharging the electric energy from the generated electric energy and the system power terminal in response to the charge / discharge control signal to the battery unit, or discharging the electric energy charged in the battery unit to the system power unit
(Method for controlling charge / discharge of solar energy - linked electric energy storage system).
8. The method of claim 7,
The step of generating and outputting the charge / discharge control signal
Generating and sharing the past photovoltaic generation variation data by storing and accumulating electric energy generation amount information measured in real time;
Analyzing the past photovoltaic generation variation data and setting and changing the charging and discharging buffer capacities of the battery unit in real time using the analyzed result and the electric energy generation amount information measured in real time; And
And generating the charging / discharging control signal for controlling the charging / discharging amount of the battery unit in real time using the charging / discharging amount and the charging / discharging efficiency data of the battery unit
(Method for controlling charge / discharge of solar energy - linked electric energy storage system).
9. The method of claim 8,
The step of setting and changing the charging and discharging buffer capacities of the battery unit in real time
Extracting and analyzing the past photovoltaic generation variation data by a preset period and detecting a maximum variation of the generated electric energy within a predetermined period; And
And setting and changing the charging and discharging buffer capacities of the battery unit in real time by reflecting the detected maximum variation amount to the charging amount and the discharging amount of the battery unit
(Method for controlling charge / discharge of solar energy - linked electric energy storage system).
9. The method of claim 8,
The step of generating the charge / discharge control signal
Calculating an efficiency value corresponding to the charged amount and the discharged amount of the battery unit using the charge / discharge efficiency data for the charge / discharge control unit for controlling the charging and discharging of the battery unit;
Generating a charge control signal for controlling the charged amount of the battery unit by reflecting the calculated efficiency value in real time; And
And generating a discharge control signal for controlling the discharge amount of the battery unit by reflecting the calculated efficiency value in real time
(Method for controlling charge / discharge of solar energy - linked electric energy storage system).
11. The method of claim 10,
The step of calculating the efficiency value
Discharge efficiency data and the discharge amount and the charge amount of the battery section calculated in consideration of the charge and discharge buffer capacity are respectively associated with the charge and discharge efficiency data, Calculating
(Method for controlling charge / discharge of solar energy - linked electric energy storage system).
11. The method of claim 10,
The step of generating the charge control signal
When the charge amount and discharge amount measurement reference point of the battery unit is the front end of the charge / discharge control unit, the charge amount control signal is generated so that a higher efficiency value is compensated for than the case where the charge amount and discharge amount measurement reference point is the rear end of the charge / discharge control unit In addition,
The step of generating the discharge control signal
When the charge amount and the discharge amount measurement reference point of the battery unit are the front end of the charge / discharge control unit, the discharge amount control signal is set to be higher than that when the charge amount and discharge amount measurement reference point is the rear end of the charge / discharge control unit Generating
(Method for controlling charge / discharge of solar energy - linked electric energy storage system).

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