KR101277904B1 - System and method for managementing electric power - Google Patents

Abstract

The power management system according to an aspect of the present invention capable of stably outputting power collects the amount of power generation from each of at least one wind generator, calculates the total amount of power generation of the at least one wind generator, and calculates the calculated power. A wind data management unit for generating and managing wind data including a total power generation amount and a measurement time; The moving time value for the wind data whose measurement time is within a predetermined time interval is calculated and predicted as the total power generation amount of the at least one wind generator, and the predicted total power generation amount is the target generation amount of the at least one wind generator. A target generation amount setting unit set to be; And a charging mode for charging a difference value between the target generation amount and the total power generation amount to a battery energy storage system (BESS) and a discharge mode for discharging the difference value from the BESS to generate power generated by the at least one wind generator. It includes a charge / discharge control unit for controlling the BESS to be evenly output to the power system.

Description

POWER MANAGEMENT SYSTEM AND MANAGEMENT METHOD {SYSTEM AND METHOD FOR MANAGEMENTING ELECTRIC POWER}

The present invention relates to a power management system, and more particularly, to a power management system associated with a wind generator and a management method thereof.

As fossil energy is depleted, there is a need for alternative energy sources. Wind power generation, which generates energy by wind power among alternative energy sources, is emerging as the most competitive alternative to thermal power generation because of the low cost of power generation that reflects facility investment costs. However, the wind power can fluctuate irregularly in speed and direction every time the wind, which is the source of energy, fluctuates in speed and direction, so that the power may be output irregularly, which may degrade the power quality supplied to the user.

Japanese Patent Laid-Open No. 2005-83308 and Korean Patent Laid-Open No. 2010-0009626 (hereinafter referred to as prior arts) provide a wind generator that controls the wind power generation amount by controlling the pitch angle of a blade. However, the prior art only controls the power to be output at the maximum power generation at the present time, and still does not suggest a method for stably controlling the power that is unevenly output depending on weather conditions. In addition, since the prior art controls the amount of wind power generated for each wind generator, the larger the number of wind generators, the greater the system load.

Disclosure of Invention The present invention has been made in view of the above-described problems, and an object thereof is to provide a power management system and a management method capable of stably outputting power even in a weather change by charging or discharging power in an energy storage device.

In addition, the present invention is to solve the above problems, to provide a power management system and a management method that can minimize the system load by integrated management of the power generated in at least one wind generator to another technical problem.

Power management system according to an aspect of the present invention for achieving the above object, by collecting the power generation amount from each of the at least one wind generator to generate and manage the wind data including the total amount of power generation of the at least one wind generator Wind data management unit; The moving average value of the wind data within a predetermined time period among the wind data is calculated and predicted as the total power generation amount of the at least one wind generator, and the predicted total power generation amount as the target generation amount of the at least one wind generator. A target generation amount setting unit for setting; And a charge / discharge control unit controlling the BESS to select one of a charging mode for charging a difference value between the target generation amount and the total power generation amount in a battery energy storage system (BESS) and a discharge mode for discharging the difference value from the BESS. It is characterized by including.

According to another aspect of the present invention, there is provided a power management method comprising: generating wind data including a total amount of power generation of at least one wind generator; Generating smoothing data by applying a smoothing weight to the wind power to a corresponding power generation amount, and setting a target power generation amount of the at least one wind generator based on the smoothing data; And comparing the target generation amount with the total amount of power generation and selecting one of a charging mode for charging the difference value to the BESS and a discharge mode for discharging the difference value from the BESS to control the BESS. do.

According to the present invention, since the power can be evenly output even when the weather conditions are changed by charging surplus power in the energy storage device or discharging insufficient power from the energy storage device, high quality power can be supplied.

In addition, according to the present invention, there is an effect that the system load can be reduced because it integrates and stabilizes irregularly generated power in at least one wind generator.

1 is a view for explaining a wind power generation system.
2 is a configuration diagram illustrating the power management system of FIG.
3 is a configuration diagram illustrating an initial state preparation unit of FIG. 2.
4 is a configuration diagram illustrating the BESS control unit of FIG. 2.
5 is a graph and a chart for explaining a target generation amount calculated based on the total amount of power generation.
6 is a flowchart illustrating a method of managing power by the power management system of FIG. 2.
7 is a flowchart illustrating a system preparation method performed in FIG. 6.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments may be variously modified and may have various forms, and thus the scope of the disclosed technology should be understood to include equivalents capable of realizing the technical idea. Also, the purpose or effect of the disclosed technology should not be construed as being limited thereby, as it does not mean that a particular embodiment must include all such effects or merely include such effects.

1 is a diagram illustrating a wind power generation system 100.

Referring to FIG. 1, the wind power generation system 100 includes at least one wind generator 110, a BESS 120, and a power management system 130.

At least one wind generator 110 converts the wind into power using a wind turbine. The wind turbine may be composed of a plurality of blades, a transmission, and a generator. The plurality of blades can be rotated by wind force. At this time, the rotational force is transmitted to the transmission to drive the generator. The generator can convert the kinetic energy of the motor into electric energy to produce electric power.

At least one wind generator 110 supplies the generated power to the power system through the power line 140. Here, the power system may include a power plant, a substation, a transmission line, and may also include a configuration for purchasing power such as a power exchange.

The battery energy storage system (BESS) 120 receives power from at least one wind generator 110 and stores it in an energy storage device, and supplies power to the outside from the energy storage device. In the present invention, the BESS 120 is connected in parallel between the at least one wind generator 110 and the power system, can receive the charge from the at least one wind generator 110 and stored in the energy storage device, The electric power stored in the energy storage device may be discharged and supplied to the power system.

The power management system 130 controls the charge / discharge operation of the BESS 120 so that the power produced by the at least one wind generator 110 can be stably supplied to the power system. In one embodiment, the power management system 130 sends a portion of the power generated by the at least one wind generator 110 to the BESS 120 when the power produced by the at least one wind generator 110 is greater than the target value. ) To reduce the power supplied through the power line 140 to ensure a stable power supply to the power system. In addition, the power management system 130 discharges at least a part of the power stored in the BESS 130 when the power produced by the at least one wind generator 110 is smaller than the target value and supplies it through the power line 140. Increasing the power can be supplied to the power system in a stable manner.

In the above-described embodiment has been described that the power management system 130 is implemented as a separate system physically separated from the at least one wind generator 110, in another embodiment it is included in the at least one wind generator 110 Can be.

2 is a configuration diagram illustrating the power management system of FIG. 3 is a configuration diagram illustrating an initial state preparation unit of FIG. 2, and FIG. 4 is a configuration diagram illustrating the BESS control unit of FIG. 2.

2, the power management system 130 includes a wind data management unit 220, a target generation amount setting unit 230, and a BESS control unit 240, and includes an initial state preparation unit 210 and an abnormality detection unit ( 250, and the connection state blocking unit 260 may be further included.

The initial state preparation unit 210 checks the preparation state of the power management system 100 before controlling the BESS 120. The initial state preparation unit 210 checks whether the initial operation condition is satisfied in the preparation state check, and if the initial operation condition is satisfied, the power management system 130 may start control of the BESS 120.

Referring to FIG. 3, the initial state preparation unit 210 includes an initial value setting unit 310 and an initial state checking unit 320. The initial state check unit 320 may include a link state check unit 321, a wind data check unit 322, and a charge amount check unit 323.

The initial value setting unit 310 sets at least one of a control period, a time interval, the minimum charge amount and the maximum charge amount of the BESS 120. The control period may correspond to a time interval for controlling the BESS 120, and the time period may correspond to time information for determining wind data based on a target power generation calculation. The minimum charge amount and the maximum charge amount of the BESS 120 correspond to the minimum or maximum power charge amount required by the BESS 120 for the stable operation of the power management system 100.

The initial state checking unit 320 determines whether the power management system 100 is operable by checking the initial operating condition.

The linkage state checking unit 321 checks the driving state and the linkage state of at least one wind generator 110 or BESS (120). The linkage status checker 321 may check whether at least one wind generator 110 or the BESS 120 is electrically connected to the power management system 130. In this case, the linkage state checking unit 321 may attempt electrical communication by setting the same frequency as the at least one wind generator 110 or the BESS 120.

The wind data checking unit 322 checks whether the wind data required for controlling the BESS 120 is stored in the wind data managing unit 220. For example, the wind data checking unit 322 may check whether the number of wind data stored in the wind data management unit 220 exceeds a minimum number of data predetermined by the manager.

The charging amount checking unit 323 checks the charging amount of the BESS 120. The charging amount checking unit 323 may check whether the charging amount of the BESS 120 is between the minimum charging amount and the maximum charging amount set by the initial value setting unit 310.

The initial state preparation unit 210 sets an initial value necessary for controlling the BESS 120 and the initial operation conditions are satisfied from the linkage state checking unit 321, the wind data checking unit 322, and the charging amount checking unit 323. Once confirmed, the power management system 100 can initiate control of the BESS 120.

Referring back to FIG. 2, the wind data management unit 220 collects the amount of power generation measured from each of the at least one wind generator 110 and calculates the total amount of power generation of the at least one wind generator 110 based on the measurement time. do. Here, the total amount of power generation corresponds to the sum of the amount of power generation measured by each of the at least one wind generator 110. The wind data management unit 220 generates and stores wind data including the calculated total power generation amount and the measurement time.

The target generation amount setting unit 230 determines the target generation amount based on the wind data collected in the past. The target generation amount corresponds to the generation amount required at a specific time, and may be determined using a generation amount prediction algorithm.

The generation amount prediction algorithm generates smoothing data by applying a smoothing weight to the total amount of power generation, which decreases in the reverse order of the measurement time of the total amount of power generation, and calculates a moving average value based on the smoothing data of the at least one wind generator 110. The total amount of power generation can be estimated. In this case, the smoothing weight is greater than 0 and less than or equal to 1.

In one embodiment, the smoothing weight may decrease exponentially. For example, the generation amount prediction algorithm may be expressed as follows.

Where a is a constant greater than 0 and less than or equal to 1, WTP _t is the target generation at time t, WT _t-1 is the total power generation at time t-1, and WTP _t-1 is at time t-1 It can indicate the target generation amount. If t = 0, initial setting to WTP _t-1 = WT ₀ .

Equation 1 can be solved as follows.

Here, a ^c-1 X (1-a) corresponds to a smoothing weight to be applied to the total amount of power generation measured at time tc. Since a has a number between 0 and 1, the smoothing weight decreases as c increases. Therefore, the target power generation amount WTP _t can be obtained by adding the value of the total power generation amount WT _tc multiplied by the smoothing weight which decreases in the reverse order, and this value corresponds to the moving average value of the power generation amount.

In one embodiment, the generation amount prediction algorithm may calculate the target generation amount based on the wind data in which the measurement time of the power generation amount in the continuous wind data has a predetermined time interval. At this time, the generation amount prediction algorithm may be expressed as follows.

Where a is a constant greater than 0 and less than or equal to 1, b is a constant greater than 1, WTP _t is the target generation at time t, WT _t-1 is the total power generation at time t-1, and WTP _tb is the time It can represent the target generation in tb. If t = 0, WTP _t-1 = WT ₀ is initially set. Referring back to FIG. 2, the BESS controller 240 controls the operation of the BESS 120 according to a predetermined condition.

Referring to FIG. 4, the BESS control unit 240 includes a charge / discharge control unit 410, an upper limit / lower limit limiter 420, and a power rating limiter 430.

The charge / discharge control unit 410 controls the charge / discharge operation of the BESS 120. The charge / discharge control unit 410 selects one of a charging mode and a discharge mode by comparing the target generation amount determined by the target generation amount setting unit 230 with the total amount of power generation.

When the target power generation amount is larger than the total power generation amount, the charge / discharge control unit 410 selects a discharge mode and controls the BESS 120 to discharge a part of the power stored in the BESS 120. In this case, the amount of discharge power may correspond to the difference between the target generation amount and the total power generation amount.

When the target power generation amount is smaller than the power generation amount, the charge / discharge control unit 410 selects a charging mode and controls the at least one wind generator 110 to charge a portion of the generated power through the power line 140. In this case, the charging power amount may correspond to a difference value between the target power generation amount and the total power generation amount.

In one embodiment, the charge / discharge control unit 410 may control the charge / discharge operation of the BESS 120 when the target power generation amount is larger or smaller than the total power generation amount. In another embodiment, the charge / discharge control unit 410 may control the charge / discharge operation of the BESS 120 when the difference between the target generation amount and the total amount of power generation is out of a predetermined control dead band. have. Here, the control dead band may represent a range of values that do not control the BESS 120 despite the difference between the target generation amount and the total power generation amount. The power management system 130 may reduce the number of operations for controlling the BESS 120 by presetting the control dead band.

The upper limit limit 420 limits the amount of charge of the BESS 120. The upper limit / lower limit unit 420 may select an upper limit mode by comparing the charge amount of the BESS 120 with a predetermined charge upper limit, and select the lower limit mode by comparing the charge amount of the BESS 120 with a predetermined charge lower limit. . The charge amount may be expressed as a percentage of the stored power amount based on the total capacity of the energy storage device. For example, the charge amount upper limit may be set to 77%, and the charge amount lower limit may be set to 23%.

When the charge amount of the BESS 120 exceeds the predetermined charge amount upper limit, the upper limit / lower limit limiter 420 selects an upper limit mode, and limits the charge amount of the BESS 120 not to exceed the predetermined charge amount upper limit. The upper limit / lower limit unit 420 may update the target generation amount set by the target generation amount setting unit 230 to discharge power from the BESS 120. In this case, the target generation amount may be updated by using an upper limit constraint algorithm.

The upper limit constraint algorithm may increase the target generation amount set by the target generation amount setting unit 230 to discharge the power from the BESS 120 to reduce the amount of charge of the BESS 120.

In one embodiment, the upper limit constraint algorithm may increase the target amount of generation using the standard deviation of the total amount of power generation. In this case, the upper limit constraint algorithm may obtain a target power generation amount using the following equation.

Where a is a constant greater than 0 and less than or equal to 1, b is a positive integer, WTP _t is the target generation at time t, WT _t-1 is the total power generation at time t-1, and WTP _t-1 is The target generation at time t-1, stdev, can represent the standard deviation of power generation. If t = 0, initial setting to WTP _t-1 = WT ₀ .

In one embodiment, b may be determined according to the amount of charge of the BESS 120. For example, when the charging amount of the BESS 120 is 78%, the target generation amount setting unit 230 sets b to 1, while when the charging amount of the BESS 120 is 80%, b is set to 3 to generate the target generation amount. Can be updated to a larger value.

The upper limit / lower limit unit 420 may cause the BESS 120 to discharge power by the charge / discharge control unit 410 when the updated target generation amount is greater than the total amount of power generation.

When the charge amount of the BESS 120 falls below a predetermined charge limit, the upper limit / lower limit unit 420 selects a lower limit mode and restricts the charge amount of the BESS 120 not to fall below the predetermined charge amount lower limit. The upper limit / lower limit unit 420 may update the target generation amount set by the target generation amount setting unit 230 to charge the power to the BESS 120. In this case, the target power generation amount may be updated using a lower limit constraint algorithm.

The lower limit algorithm may decrease the target generation amount set by the target generation amount setting unit 230 to charge the BESS 120 to increase the amount of charge of the BESS 120.

In one embodiment, the lower limit algorithm may increase the target generation amount using the standard deviation of the generation amount. In this case, the lower limit constraint algorithm may obtain a target power generation amount using the following equation.

Where a is a constant greater than 0 and less than or equal to 1, b is a positive integer, WTP _t is the target generation at time t, WT _t-1 is the total power generation at time t-1, and WTP _t-1 is The target generation at time t-1, stdev, can represent the standard deviation of power generation. If t = 0, initial setting to WTP _t-1 = WT ₀ .

In one embodiment, b may be determined according to the amount of charge of the BESS 120. For example, when the charging amount of the BESS 120 is 22%, the target generation amount setting unit 230 sets b to 1, while when the charging amount of the BESS 120 is 20%, b is set to 3 to generate the target generation amount. Can be updated to a smaller value.

The upper limit / lower limit unit 420 may allow the BESS 120 to charge the power by the charge / discharge control unit 410 when the updated target generation amount is smaller than the total amount of power generation.

The power rating limiting unit 430 limits the amount of charging or discharging power of the BESS 120. When the amount of charging or discharging power of the BESS 120 exceeds the rating of the BESS 120, the power rating limiting unit 430 selects a power rating mode and restricts not to exceed the rating of the BESS 120. The power rating limiting unit 430 may update the target generation amount set by the target generation amount setting unit 230 in order to reduce the amount of charging power or the discharge power of the BESS 120. In this case, the target power generation amount may be updated using a power rating constraint algorithm.

The power rating constraint algorithm may update the target power generation amount to match the rating of the BESS 120 by reducing the amount of charging or discharging power of the BESS 120.

In one embodiment, the power rating constraint algorithm may update the target generation amount based on the total amount of power generation measured within the first predetermined time interval. For example, the power rating constraint algorithm may update the target generation amount based on the total generation amount measured within the last minute.

The power rating limiting unit 430 may update the charging power amount or the discharge power amount by comparing the updated target generation amount with the total power generation amount. The power rating limiting unit 430 may re-update the target generation amount based on the total amount of power generation measured within the second predetermined time period when the updated charging power amount or the discharge power amount exceeds the rating of the BESS 120. . In this case, the second time interval may be shorter than the first time interval. For example, the power rating constraint algorithm may update the target generation amount based on the total generation amount measured within the last 30 seconds.

If the updated charging power amount or the discharge power amount does not exceed the rating of the BESS 120, the power rating limiting unit 430 causes the BESS 120 to operate as much as the charging power amount or the discharge power amount by the charge / discharge control unit 410. Can be charged or discharged.

Referring back to FIG. 2, the abnormality detector 250 monitors at least one wind generator 110 to detect an error condition. For example, when one of the at least one wind generator 110 malfunctions or stops, the abnormality detection unit 250 detects an error state of one wind generator 111 and an error in the link state breaker 260. You can send a signal. In addition, the abnormality detection unit 250 may transmit a notification message regarding an error state of one wind generator 111 to a terminal device (not shown) of a manager that is stored in advance, thereby facilitating quick response of the manager.

The link state blocking unit 260 blocks the link with the BESS 120 when an error signal is received from the abnormal detection unit 250. Accordingly, the BESS 120 may secure stability from an accident of the at least one wind generator 110 without performing a charge / discharge operation until it is reconnected with the at least one wind generator 110. Linked state blocking unit 260 may be implemented as a protective relay, a circuit breaker.

5 is a graph and a chart for explaining a target generation amount calculated based on the total amount of power generation.

Referring to FIG. 5, the wind data may include a total amount of power generation and a measurement time measured every 1/20 second. And the initial target power generation amount can be set equal to the initial power generation total amount.

The target power generation amount may be calculated using Equation 1.

In Equation 1, when a is set to 0.995 and a target power generation amount is calculated, a value as shown in FIG. 5A may be obtained. Referring to FIG. 5A, the total amount of power generation 510 may be irregularly drawn, and the target amount of generation 520 may be drawn with a gentle curve.

The power management system 130 may control the BESS 120 to charge or discharge the power to the BESS 120 as much as a gap 530 generated between the total power generation amount 510 and the target generation amount 520. For example, when the total amount of power generated 510 is greater than the target amount of generated 520, the power management system 130 may control the BESS 120 to charge the BESS 120 with electric power equal to the gap 531. For another example, if the total amount of power generated 510 is less than the target amount of generated 520, the power management system 130 may control the BESS 120 to discharge the power of the gap 532 to the BESS 120. have.

As a result, the at least one wind generator 110 may supply a constant power, such as the target generation amount 520, to the power system by the power management system 130.

6 is a flowchart illustrating a method of managing power by the power management system of FIG. 2.

Referring to FIG. 6, the power management system 130 checks a ready state (S601). The power management system 130 may set an initial value and check an initial operating condition. A detailed description of the system preparation method will be provided later with reference to FIG. 7.

When the ready state is confirmed, the power management system 130 sets a target generation amount based on the total amount of power generation of the at least one wind generator 110 (S602). The power management system 130 collects the amount of power generated from each of the at least one wind generator 110 to calculate the total amount of power generated by the at least one wind generator 110. The power management system 130 predicts the total amount of power generation in the future based on the total amount of power generation in the past, and sets the predicted amount of power generation as a target generation amount of the at least one wind generator 110.

In an embodiment, the power management system 130 may generate smoothing data by applying a smoothing weight to the total power generation amount, which decreases in the reverse order of measurement time, and add the smoothing data to obtain a target power generation amount. At this time, since the smoothing weight decreases in the reverse order of the measurement time, the target power generation amount corresponds to a moving average value calculated by giving higher reliability to recent wind data.

The power management system 130 compares the target generation amount with the total power generation amount and checks whether the difference value is included in the control dead band (cdb) (S603). When the difference value of the amount of power generation is included in the control dead band, the power management system 130 does not control the charging / discharging operation of the BESS 120, and may supply all the power generated by the at least one wind generator 110 to the power system. Can be.

The power management system 130 checks the charging amount of the BESS 120 when the difference value of power generation amount is not included in the control dead band and the target power generation amount is larger than the power generation total amount (S603 and S604). The power management system 130 may determine to receive insufficient power from the BESS 120 in order to supply power to the power system corresponding to the target generation amount when the target generation amount is greater than the total generation amount. In this case, the power management system 130 may control the BESS 120 to discharge the power stored in the BESS 120.

However, when the power stored in the BESS 120 falls below the lower limit of the charge amount, the power management system 130 controls the BESS 120 to charge the BESS 120 by selecting a lower limit mode for stable operation of the system. (S605 and S606). The power management system 130 performs a lower limit algorithm to charge the BESS 120 to increase the amount of charge. The lower limit algorithm can reduce the target generation amount by using the standard deviation of the generation amount. In this case, when the reduced target power generation amount is smaller than the total power generation amount, the power management system 130 may control the BESS 120 to charge the power corresponding to the power generation amount difference in order to output the power of the target power generation amount to the power system. Accordingly, the charging amount of the BESS 120 is increased.

In one embodiment, the power management system 130 may reduce the target power generation amount by repeatedly performing the lower limit constraint algorithm until the amount of charge of the BESS 120 reaches a maximum amount of charge preset by the initial value setting unit 310. In order to output the updated target generation amount, the BESS 120 may be controlled to charge surplus power.

If the power stored in the BESS 120 is equal to or greater than the lower limit of the charge amount, the power management system 130 checks whether the amount of discharge power exceeds the rating of the BESS 120 (S607). When the amount of discharge power exceeds the rating of the BESS 120, the power management system 130 selects the power constraint mode to update the target generation amount in order to match the amount of discharge power to the rating of the BESS 120 (S608). Here, the discharge power amount corresponds to the electric power by the difference between the target power generation amount and the total power generation amount. The power management system 130 updates the target generation amount so that the amount of discharge power is within the rating of the BESS 120. In this case, the target power generation amount may be updated using a power rating constraint algorithm.

The power rating constraint algorithm may update the target generation amount based on the total amount of power generation measured in the first predetermined time interval. The power management system 130 may update the amount of discharge power based on the updated target generation amount and the total amount of power generation, and re-confirm whether the updated amount of discharge power is within the rating of the BESS 120.

If the updated discharge power amount is larger than the rating of the BESS 120, the power management system 130 may re-update the target power generation amount based on the total power generation amount measured in the second predetermined time interval. In this case, the second time interval may be shorter than the first time interval. The power management system 130 may update the target power generation while reducing the time interval until the discharge power amount is within the rating of the BESS 120.

When the amount of discharge power does not exceed the rating of the BESS 120, the power management system 130 controls the BESS 120 to discharge power by the amount of discharge power (S609).

The power management system 130 checks the charging amount of the BESS 120 when the difference between the target power generation amount and the power generation amount is not included in the control dead band and the target generation amount is smaller than the power generation amount (S603 and S604).

When the power stored in the BESS 120 exceeds the upper limit of charge amount, the power management system 130 controls the BESS 120 to discharge the power from the BESS 120 by selecting an upper limit mode for stable operation of the system ( S610 and S606). The power management system 130 may update the target generation amount by using an upper limit constraint algorithm to reduce the amount of charge of the BESS 120. The upper limit constraint algorithm may increase the target generation amount by using the standard deviation of the generation amount of power. At this time, when the increased target generation amount is greater than the total power generation amount, the power management system 130 may control the BESS 120 to discharge the power by the difference in the generation amount in order to output as much power as the target generation amount to the power system. Accordingly, the charging amount of the BESS 120 is reduced.

In one embodiment, the power management system 130 may increase the target power generation amount by repeatedly performing the upper limit constraint algorithm until the charge amount of the BESS 120 reaches a preset minimum charge amount.

If the power stored in the BESS 120 is less than the upper limit of the charge amount, the power management system 130 checks whether the amount of charge power exceeds the rating of the BESS 120 (S611). When the amount of charging power exceeds the rating of the BESS 120, the power management system 130 selects a power constraint mode to update the target generation amount in order to match the amount of charging power to the rating of the BESS 120 (S608). Here, the charging power amount corresponds to the power by the difference between the target power generation amount and the total power generation amount. The power management system 130 may update the target generation amount by using the power rating constraint algorithm such that the amount of charging power is within the rating of the BESS 120. Here, the power rating constraint algorithm is performed in the same manner as in S608 described above.

When the amount of charging power does not exceed the rating of the BESS 120, the power management system 130 controls the BESS 120 to discharge power by the amount of charging power (S612). The power management system 130 repeatedly executes S601 to S614 every control cycle.

Meanwhile, although not shown in FIG. 6, the power management system 130 may further include a process of additionally connecting a new wind generator. First, when a new wind generator is additionally connected, the power management system 130 may collect the power generation amount of the new wind generator. When the power generation amount of the new wind generator is collected by a certain number, the power management system 130 may calculate the total amount of power generation by adding the power generation amount of the new wind generator to the total amount of power generation of the at least one wind generator 110. . Here, the predetermined number may be set in advance by the administrator and corresponds to the minimum number of data for setting the target generation amount. The power management system 130 may update the wind data based on the calculated total amount of power generation.

In addition, the power management system 130 may further include the step of monitoring at least one wind generator 110, and blocking the connection with the corresponding wind generator when the abnormality occurs in one or more wind generators. First, when an abnormality occurs in one or more wind generators, the power management system 130 may control the BESS 120 to block the link between the BESS 120 and the one or more wind generators. The power management system 130 may calculate the total amount of power generation by subtracting the amount of power generation of the one or more wind generators from the total amount of power generation of the at least one wind generator 110. The power management system 130 may update the wind data based on the calculated total amount of power generation.

7 is a flowchart illustrating a system preparation method.

Referring to FIG. 7, first, the power management system 130 checks the driving state and the linked state of the at least one wind generator 110 or the BESS 120 (S701). For example, the power management system 130 may request power generation amount information from each of the at least one wind generator 110 or request the charging amount information of the energy storage device from the BESS 120, and according to the response state, the driving state and You can check the connection status.

When the driving state and the connected state of the at least one wind generator 110 or the BESS 120 is confirmed, the power management system 130 initializes at least one of a time interval, a control period, a minimum charge amount and a maximum charge amount of the energy storage device. Set to a value (S702).

The power management system 130 checks whether the wind data exceeds a certain number (S703). The power management system 130 may preset a minimum number of data necessary to set a target power generation amount.

If the wind data exceeds a certain number, the power management system 130 checks whether the charge amount of the BESS 120 is included between the minimum charge amount and the maximum charge amount initially set (S704). When the charge amount of the BESS 120 is less than the minimum charge amount, the power management system 130 controls the BESS 120 to charge the energy storage device with the power produced by the at least one wind generator 110 (S705 and S706). If the charge amount of the BESS 120 exceeds the maximum charge amount, the power management system 130 controls the BESS 120 to discharge power from the BESS 120 (S705 and S707).

If the charge amount of the BESS 120 is included between the minimum and maximum charge amounts, the power management system 130 terminates system preparation and initiates control of the BESS 120.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the following claims It can be understood that

Claims (19)

A wind data management unit which collects power generation from each of at least one wind generator and generates and manages wind data including a total power generation of the at least one wind generator;
The moving average value of the wind data within a predetermined time period among the wind data is calculated and predicted as the total power generation amount of the at least one wind generator, and the predicted total power generation amount as the target generation amount of the at least one wind generator. A target generation amount setting unit for setting; And
And a charge / discharge control unit controlling the BESS to select one of a charging mode for charging a difference value between the target generation amount and the total power generation amount to a battery energy storage system (BESS) and a discharge mode for discharging the difference value from the BESS. and,
The target power generation amount setting unit calculates the moving average value based on the smoothing data generated by applying a smoothing weight to the corresponding power generation total amount which decreases in the reverse order of time of the wind data. delete The method of claim 1, wherein the target amount of power generation

Where a is a constant greater than 0 and less than or equal to 1, b is a constant greater than or equal to 1, WTP _t is the target power generation at time t, and WT _t-1 at time t-1 The total power generation amount, WTP _tb is a power management system, characterized in that it represents the target generation amount at time tb. The method of claim 1, wherein the charge / discharge control unit
Selecting the discharge mode to discharge the difference value from the BESS when the set target generation amount is greater than the total power generation amount;
And selecting the charging mode to charge the difference value to the BESS when the set target generation amount is smaller than the total power generation amount. The method of claim 1, wherein the charge / discharge control unit
And controlling the BESS to charge or discharge when the difference between the set target generation amount and the total amount of power generation is out of a predetermined control dead band. The method of claim 1,
The amount of filling of the BESS is selected by selecting at least one of an upper limit constraint mode for limiting the filling amount of the BESS so as not to exceed a predetermined filling amount upper limit and a lower limit constraint mode for limiting the filling amount of the BESS not to fall below a predetermined filling amount lower limit. And an upper limit / lower limit limiter for controlling the BESS to be maintained within the system. The method of claim 6, wherein the upper limit / lower limit is
When the charging amount of the BESS exceeds the upper limit of the charging amount, the upper limit constraint mode is selected to increase the target generation amount, and the difference between the increased target generation amount and the total power generation amount is discharged from the BESS to reduce the charging amount of the BESS. Reduce or, if the charge amount of the BESS is less than the lower limit of the charge amount, select the lower limit mode to reduce the set target power generation amount, and charge the BESS with the difference between the reduced target power generation amount and the total power generation amount. The power management system, characterized in that for increasing the charge amount of the BESS. The method of claim 7, wherein
The upper limit constraint mode sets the target power generation amount.

, Where a is a constant greater than 0 and less than or equal to 1, WTP _t is the target generation at time t, WT _t-1 is the total power generation at time t-1, and WTP _t-1 is A target power generation amount at time t-1, b is an integer greater than 0, and stdev represents a standard deviation of the total amount of power generation stored in the wind data management unit. The method of claim 7, wherein
The lower limit constraint mode sets the target power generation amount.

Is reduced to a, where a is a constant greater than 0 and less than or equal to 1, WTP _t is the target generation at time t, WT _t-1 is the total power generation at time t-1, and WTP _t-1 is A target power generation amount at time t-1, b is an integer greater than 0, and stdev represents a standard deviation of power generation amount stored in the wind data management unit. The method of claim 1,
The power management system further comprises a power rating limiting unit for limiting the amount of power charged or discharged to the BESS by the charge / discharge control unit by selecting a power rating constraint mode when the difference value exceeds the rating of the BESS. . The power rating constraint mode of claim 10, wherein:
The power management system, characterized in that for updating the target amount of generation based on the total amount of power generation measured in the first predetermined time interval. The method of claim 1,
An initial value setting unit configured to set at least one of a control cycle of the BESS, a minimum charge amount and a maximum charge amount of the BESS; And
The power management system further comprises an initial state checking unit for checking an initial state of the connection by checking the connection state with the at least one wind generator, the connection state with the BESS, the number of wind data and the charge amount of the BESS. . The method of claim 1,
And the BESS for charging and storing the power under the control of the charge / discharge control unit and discharging the stored power. The method of claim 1,
An abnormality detection unit for detecting at least one error state of the at least one wind generator, generating an error signal or an error state message when the error state occurs, and reporting the error state message to a terminal device of a preset manager; And
And a linkage state blocking unit for controlling the BESS to block the linkage between the BESS and the at least one wind generator when receiving the error signal from the abnormality detecting unit. Generating wind data including a total power generation amount of the at least one wind generator;
Generating smoothing data by applying a smoothing weight to the wind power to a corresponding power generation amount, and setting a target power generation amount of the at least one wind generator based on the smoothing data; And
Comparing the target generation amount with the total amount of power generation and selecting one of a charging mode for charging the difference value to the BESS and a discharge mode for discharging the difference value from the BESS to control the BESS. The method of claim 15, wherein generating the wind power data
And detecting the abnormal state of the at least one wind generator to generate the wind data except for the wind generator in which the abnormal state is detected. The method of claim 15, wherein generating the wind power data
When the new wind generator is further linked, the power management method characterized in that for generating the wind data by adding the power generation amount of the new wind generator. 16. The method of claim 15,
When the charging mode is selected, the charging amount of the BESS is checked to limit the charging of power to the BESS when the charging amount of the BESS exceeds a predetermined charging limit, and selects a lower limit mode that discharges power from the BESS. If the amount of charge of the BESS is reduced or the discharge mode is selected, the amount of charge of the BESS is checked to limit the discharge of power from the BESS when the amount of charge of the BESS is less than a predetermined charge limit, and the power is supplied to the BESS. Selecting an upper limit constraint mode to charge the power management method further comprising the step of increasing the amount of charge of the BESS. 19. The method of claim 18 wherein the increasing step
And reducing or increasing the target amount of generation using the standard deviation of the total amount of power generation received from the wind generator to the target amount of generation.

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