KR101390104B1 - System for managementing electric power - Google Patents

System for managementing electric power Download PDF

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Publication number
KR101390104B1
KR101390104B1 KR1020120158521A KR20120158521A KR101390104B1 KR 101390104 B1 KR101390104 B1 KR 101390104B1 KR 1020120158521 A KR1020120158521 A KR 1020120158521A KR 20120158521 A KR20120158521 A KR 20120158521A KR 101390104 B1 KR101390104 B1 KR 101390104B1
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South Korea
Prior art keywords
power
value
command value
power command
time
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KR1020120158521A
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Korean (ko)
Inventor
조형민
이희태
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주식회사 포스코아이씨티
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors
    • F03D7/02Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0272Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor by measures acting on the electrical generator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors
    • F03D7/02Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/028Controlling motor output power
    • F03D7/0284Controlling motor output power in relation to the state of the electric grid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D7/00Controlling wind motors
    • F03D7/02Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/04Automatic control; Regulation
    • F03D7/042Automatic control; Regulation by means of an electrical or electronic controller
    • F03D7/048Controlling wind farms
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • Y02E10/723
    • Y02E10/763
    • Y02E10/766

Abstract

A power management system according to an aspect of the present invention that can stably output electricity comprises: a communication gateway that receives wind power data including the generated electricity of a wind generator from an electricity meter and transmits charge and discharge controlling data about a battery energy storage system (BESS) to the BESS; and a controller that discerns an electricity reference value for electricity outputted to an electric power system by using the wind power data, discerns a charge or discharge operation for the BESS by comparing the discerned electricity reference value to generated electricity, and generates charge and discharge controlling data for the BESS according to the discerned charge or discharge operation. The rate of change in the electricity reference value for a unit time is equivalent to or less than a standard value. [Reference numerals] (132) Communication gateway; (134) Controller; (136) Memory; (140) First electricity meter; (150) Second electricity meter; (AA) Electric power system

Description

SYSTEM FOR MANAGEMENT ELECTRIC POWER

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

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.

SUMMARY OF THE 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 capable of stably outputting power even in a weather change by charging or discharging power in an energy storage device.

Another object of the present invention is to provide a power management system in which a rate of increase or decrease of power output to a power system can be formed within a predetermined range.

The power management system according to an aspect of the present invention for achieving the above object, the communication receiving wind data including the generated power of the wind generator from the power meter, and transmits the charge and discharge control data for the BESS to the BESS Gateway; And determining a power command value for the power output to the power system using the wind data, and comparing the determined power command value with the generated power to determine whether to charge or discharge the battery energy storage system (BESS). And a controller for generating charge / discharge control data for the BESS according to the determined charge / discharge. The power command value is characterized in that the increase and decrease rate during the unit time is less than or equal to the reference value.

Wind power generation system according to another aspect of the present invention for achieving the above object, at least one BESS (Battery) to charge the power generated by the at least one wind generator in the battery, or discharge the power stored in the battery to the grid Energy Storage System); And collecting generation power information of the at least one wind generator, and determining a power command value for the power output to the power system using the collected generation power information and the increase / decrease rate, and at least according to the determined power command value. It characterized in that it comprises a power management system for controlling the charging and discharging of one BESS.

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, the output power can be stabilized by limiting the increase / decrease rate of the power command value with respect to the power output to the power system, thereby ensuring the reliability of the power produced by the wind generator There is another effect of improving power quality.

1 is a view for explaining a wind power generation system.
FIG. 2 is a configuration diagram illustrating the communication gateway of FIG. 1.
3 is a configuration diagram illustrating the controller of FIG. 1.
4 is a configuration diagram illustrating an initial state preparation unit of FIG. 3.
FIG. 5 is a configuration diagram illustrating the increase / decrease rate limiting unit of FIG. 3.
6A is a graph showing a first embodiment of the generated power and the power command value.
6B is a graph showing instantaneous increase and decrease rates of the generated power and the power command value according to the first embodiment.
6C is a graph showing an average increase and decrease rate of the generated power and the power command value according to the first embodiment.
7A is a graph showing a second embodiment of the generated power and the power command value.
7B is a graph showing instantaneous increase and decrease rates of the generated power and the power command value according to the second embodiment.
7C is a graph showing an average increase and decrease rate of the generated power and the power command value according to the second embodiment.
8 is a flowchart illustrating a method of managing power according to an embodiment of the present invention.
9 is a flowchart illustrating a method of changing a current power command value according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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, a power management system 130, a first power meter 140, and a second power meter 150. It includes.

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 160. 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 the power 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.

For example, the power management system 130 transmits 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 power command value. The charging may reduce the power supplied through the power line 160 to stably supply power to the power system.

In addition, when the power produced by the at least one wind generator 110 is smaller than the power command value, the power management system 130 discharges a part of the power stored in the BESS 130 through the power line 160. Increasing the power supplied can ensure a stable power supply to the power system.

This power management system 130 includes a communication gateway 132, a controller 134 and a memory 136.

First, the communication gateway 132 receives measurement data from the first and second power meters 140 and 150, and receives state data for the BESS 120 from the BESS 120. The communication gateway 132 then provides the received data to the controller 134. The communication gateway 132 also transmits control data for the BESS 120 transmitted from the controller 134 to the BESS 120.

In this case, the communication gateway 132 may include a second power meter 140, a second power meter 150, and a second node including at least one logical node having a hierarchical structure on the first data received from the BESS 120. The data is converted into data and provided to the controller 134.

Hereinafter, the communication gateway 132 will be described in more detail with reference to FIG. 2.

FIG. 2 is a configuration diagram illustrating the communication gateway of FIG. 1.

2, the communication gateway 132 includes a communication channel 210, a gateway manager 220, a hierarchy table 230, and a data table 240.

The communication channel 210 receives first data from any one of the first power meter 140, the second power meter 150, and the BESS 120, or the first power meter 140, the second power meter ( 150) and the first data is output to one of the BESS 120.

The gateway manager 220 converts first data received from any one of the first power meter 140, the second power meter 150, and the BESS 120 into second data including at least one logical node. .

In detail, the gateway manager 220 determines a hierarchical structure for the first data input through the communication channel 210 using the hierarchical table 230, and determines one or more units according to the determined measurement structure. Split into information.

In this case, the first data may include at least one of location information on which the device is installed, identification information for identifying the device, identification information for identifying a lower device included in the device, and one or more attribute information for the lower device. For example, the first data received from the BESS 120 may include location information on which the BESS 120 is installed, identification information of a battery included in the BESS 120, and attribute information of the battery.

The gateway manager 220 may receive the first data and divide the first data into information units. The gateway manager 220 converts the divided one or more unit information into one or more logical nodes using the data table 240.

For example, when the first data is divided into location information in which the BESS 120 is installed, identification information of a battery included in the BESS 120, and attribute information of the battery, the gateway manager 220 may include a data table 240. ), Logic nodes mapped to the plurality of unit information, for example, Seoul, Main_Bdg, Battery1, On may be extracted.

The gateway manager 220 connects one or more logical nodes with a delimiter, for example, a string '.' To generate second data.

The second data generated as described above is provided to the controller 134 via the communication channel 210.

Meanwhile, the gateway manager 220 may read the second data input from the controller 134 to the one of the first power meter 140, the second power meter 150, and the BESS 120. Convert to a data structure.

For example, if the first power meter 140 can extract information from the second data, the gateway manager 220 transfers the second data to the first power meter 140 via the communication channel 210 without data structure conversion. Can provide.

However, if the first power meter 140 cannot extract information from the second data, the gateway manager 220 converts the second data into a data structure supported by the first power meter 140 to communicate with the communication channel 210. ) May be provided to the first power meter 140.

Referring back to FIG. 1, the controller 134 receives wind data including the generated power of the wind power generator through the communication gateway 132 from the first power meter 140, and uses the received wind data to generate a BESS ( Charge / discharge of the control unit 120 is determined to generate charge / discharge control data.

Hereinafter, the controller 134 will be described in detail with reference to FIG. 3.

3 is a configuration diagram illustrating the controller of FIG. 1.

Referring to FIG. 3, the controller 134 includes a wind data management unit 330, a power command value calculating unit 340, an increase / decrease rate limiting unit 350, and a charge / discharge control unit 360. In this case, the electronic device may further include at least one of the initial state preparation unit 310, the abnormality detection unit 370, and the connection state blocking unit 380.

The initial state preparation unit 310 checks the preparation state of the power management system 130 before controlling the BESS 120. The initial state preparation unit 310 checks whether the initial operation condition is satisfied in the preparation state check, and enables the power management system 130 to start control of the BESS 120 when the initial operation condition is satisfied.

Hereinafter, the initial state preparation unit 310 will be described in more detail with reference to FIG. 4.

4 is a configuration diagram illustrating an initial state preparation unit of FIG. 3.

Referring to FIG. 4, the initial state preparation unit 310 includes an initial value setting unit 410 and an initial state checking unit 420. The initial state checking unit 420 may include a linked state checking unit 421, a wind data checking unit 422, and a charging amount checking unit 423.

The initial value setting unit 410 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 power command value 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 130 is operable by checking the initial operating condition.

The linkage state checking unit 421 confirms the driving state and the linkage state of the at least one wind generator 110 or the BESS (120). The link status checker 421 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 421 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 422 checks whether the wind data required for controlling the BESS 120 is stored in the wind data managing unit 330. For example, the wind data checking unit 422 may check whether the number of wind data stored in the wind data management unit 330 exceeds a minimum number of data predetermined by the manager.

The charging amount checking unit 423 checks the charging amount of the BESS 120. The charging amount checking unit 423 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 410.

The initial state preparation unit 310 sets an initial value necessary for controlling the BESS 120, and the initial operation conditions are satisfied from the linkage state checking unit 421, the wind data checking unit 422, and the charging amount checking unit 423. Once confirmed, the power management system 100 can initiate control of the BESS 120.

Referring back to FIG. 3, the wind data management unit 330 collects wind power data including generated power of at least one wind generator 110 measured by the first power meter 140 through the communication gateway 132. To the memory 136.

In addition, the wind data management unit 330 collects and stores the power data including the output power for the power system measured by the second power meter 150 through the communication gateway 132 in the memory 136.

In this case, the output power to the power system generally corresponds to the power command value determined by the power management system 130. This is because the wind power generation system 100 according to the exemplary embodiment of the present invention controls the power output to the power system according to the power command value determined by the power management system 130.

Next, the power command value calculator 340 calculates the power command value based on the wind data collected in the past. Here, the power command value represents the power output to the power system to stabilize the power system.

The power command value calculating unit 340 may generate smoothing data by applying a smoothing weight to the power generating power, which decreases in reverse order of measurement time of the generated power, and calculate a moving average value based on the smoothing data to calculate the power command value. have. 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 power command value can be calculated using [Equation 1].

Figure 112012109768918-pat00001

Where a is a constant greater than 0 and less than or equal to 1, WTP t is the power command value at time t, and WT t - 1 is the generated power at time t-1. When t = 0, WTP t -1 = WT 0 is initially set.

[Equation 1] can be solved as Equation 2 below.

Figure 112012109768918-pat00002

Here, a c -1 X (1-a) corresponds to a smoothing weight to be applied to the generated power measured at time tc. Since a has a number between 0 and 1, the smoothing weight decreases as c becomes larger. Therefore, the power command value WTP t can be obtained by adding the value obtained by multiplying the generated power WT t -c by the smoothing weight which decreases in the reverse order, and this value corresponds to the moving average value of the generated power.

In one embodiment, the power command value calculator 340 may calculate the power command value based on the wind data in which the measurement time of the generated electric power among the continuous wind data is within a predetermined time. In this case, the power command value may be calculated using Equation 3.

Figure 112012109768918-pat00003

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 a power command value at time t, and WT t -1 may represent generated power at time t-1. If t = 0, initial setting is WTP t -1 = WT 0 .

Next, the increase / decrease rate limiting unit 350 controls the increase / decrease rate during the unit time with respect to the power command value calculated by the power command value calculator 340 not to exceed a reference value preset by the manager. For example, the increase / decrease rate limiting unit 350 may control the difference between the maximum value and the minimum value of the power command values calculated for one minute not to exceed the preset reference value 300kW.

Hereinafter, the increase / decrease rate limiting unit 350 will be described in more detail with reference to FIG. 4.

4 is a configuration diagram illustrating the increase / decrease rate limiting unit of FIG. 2.

Referring to FIG. 4, the increase / decrease rate limiting unit 350 includes a increase / decrease rate checking unit 510, a change determining unit 520, and a power command value changing unit 530.

First, the increase / decrease rate confirming unit 510 checks the increase / decrease rate for power command values (hereinafter, referred to as “past power command values”) within a certain time in the past from the present time. In detail, the increase / decrease rate confirming unit 510 confirms the maximum value and the minimum value among the past power command values, and determines the difference between the maximum value and the minimum value as the increase / decrease rate.

Next, the change determination unit 520 determines whether the increase / decrease rate of the power command value (hereinafter, referred to as 'current power command value') calculated by the power command value calculator 340 at the present time exceeds the reference value. Then, it is determined whether to change the current power command value according to the determination result.

Specifically, the change determination unit 520 compares the past power command values, the increase / decrease rate with respect to the past power command values checked by the increase / decrease rate checking unit 510, and the current power command value to compare the current power command with the current power command. Determine if the value has changed.

First, the change determination unit 520 compares the increase / decrease rate with respect to the past power command values and the reference value. When the increase / decrease rate for the past power command values exceeds the reference value, the change determination unit 520 determines to change the current power command value.

When the change of the current power command value is determined as described above, the change determination unit 520 compares the past power command values with the current power command value. The change determination unit 520 may change the current power command value by any one of the first and second power command value retrieving units 432 and 434 according to the comparison result.

In one embodiment, the change determination unit 520 may compare the minimum value of the past power command values and the current power command value.

If the current power command value is greater than the minimum value of the past power command values, the change determination unit 520 may cause the value of the current power command value to be changed by the first power command value retrieving unit 532.

On the other hand, if the current power command value is less than or equal to the minimum value of the past power command values, the change determiner 520 may cause the current power command value to be changed by the second power command value retrieval unit 534. .

In another embodiment, the change determiner 520 may compare the maximum value of the past power command values with the current power command value.

If the current power command value is smaller than the maximum value of the past power command values, the change determination unit 520 may cause the value of the current power command value to be changed by the second power command value recalculation unit 534.

On the other hand, if the current power command value is greater than or equal to the maximum value of the past power command values, the change determiner 520 may cause the current power command value to be changed by the first power command value reassignment unit 532. have.

Meanwhile, even if the increase / decrease rate for the past power command values does not exceed the reference value, the change determination unit 520 compares the current power command value with the past power command values and determines to change the current power command value according to the comparison result. Can be.

In one embodiment, the change determination unit 520 compares the current power command value and the minimum value of the past power command values, and if the current power command value is less than or equal to the minimum value of the past power command values to change the current power command value. Can be determined. In this case, the change determination unit 520 may cause the current power command value to be changed by the third power command value recalculation unit 536.

In another embodiment, the change determination unit 520 compares the current power command value with the maximum value of the past power command values, and if the current power command value is greater than or equal to the maximum value of the past power command values, the current power command value You can decide to change it. In this case, the change determination unit 520 may cause the current power command value to be changed by the fourth power command value reassignment unit 538.

Next, the power command value changing unit 530 changes the current power command value according to the determination of the change determining unit 520. The power command value changing unit 530 may include the first power command value retrieving unit 532, the second power command value retrieving unit 534, the third power command value retrieving unit 536, and the fourth electric power. At least one of the command value asset exit 538 is included.

The first power command value retrieving unit 532 recalculates and changes the current power command value calculated by the power command value calculating unit 340 using [Equation 4].

Figure 112012109768918-pat00004

Here, α is more than 0 and less than or equal to one constant, t is WTP power command value at time t, t -1 WT is the generated power, RR at time t-1 represents a reference value.

The second power command value retrieving unit 534 recalculates and changes the current power command value calculated by the power command value calculating unit 340 using [Equation 5].

Figure 112012109768918-pat00005

Here, α is more than 0 and less than or equal to one constant, t is WTP power command value at time t, t -1 WT is the generated power, RR at time t-1 represents a reference value.

The third electric power command value retrieving unit 536 recalculates and changes the current electric power command value calculated by the electric power command value calculating unit 340 using [Equation 6].

Figure 112012109768918-pat00006

Here, α is more than 0 and less than or equal to one constant, t is WTP power command value at time t, t -1 WT is the generated power, RR at time t-1 represents a reference value.

The fourth power command value retrieving unit 538 recalculates and changes the current power command value calculated by the power command value calculating unit 340 using [Equation 7].

Figure 112012109768918-pat00007

Here, α is more than 0 and less than or equal to one constant, t is WTP power command value at time t, t -1 WT is the generated power, RR at time t-1 represents a reference value.

Referring back to FIG. 2, the charge / discharge control unit 360 controls the charge / discharge operation of the BESS 120. The charge / discharge control unit 360 compares the power command value with the generated power, determines whether to charge or discharge the BESS 120 according to the comparison result, and generates charge / discharge control data according to whether the charge / discharge is performed.

When the power command value is larger than the generated power, the charge / discharge control unit 360 controls the BESS 120 to discharge a part of the power stored in the BESS 120. At this time, the discharge electric power amount may correspond to the difference value between the electric power command value and the generated electric power.

When the power command value is smaller than the generated power, the charge / discharge control unit 360 controls the at least one wind generator 110 to charge a portion of the generated power through the power line 160. At this time, the charging power amount may correspond to the difference value between the power command value and the generated power.

In one embodiment, the charge / discharge control unit 360 may control the charge / discharge operation of the BESS 120 when the power command value is larger or smaller than the generated power.

In another embodiment, the charge / discharge control unit 360 may control the charge / discharge operation of the BESS 120 when the difference between the power command value and the generated power is out of a predetermined control dead band. Here, the control dead band may represent a range of values that do not control the BESS 120 despite the difference between the power command value and the generated power. The power management system 130 may reduce the number of operations for controlling the BESS 120 by presetting the control dead band.

Next, the abnormality detecting unit 370 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 detecting unit 370 detects an error state of the one wind generator 111 and an error in the link state blocking unit 260. You can send a signal.

In addition, the abnormality detecting unit 370 may transmit a notification message regarding an error state of one wind generator 111 to a terminal device (not shown) of a manager, which is stored in advance, so that the manager may respond quickly.

Next, when the link state blocking unit 380 receives an error signal from the abnormality detecting unit 370, the link state blocking unit 380 blocks the link with the BESS 120. 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. The connection state blocking unit 380 may be implemented as a protective relay, a circuit breaker, or the like.

6A is a graph showing a first embodiment of the generated power and the power command value. 6B is a graph showing instantaneous increase and decrease rates of the generated power and the power command value according to the first embodiment. 6C is a graph showing an average increase and decrease rate of the generated power and the power command value according to the first embodiment.

FIG. 6A shows the generated power 610 produced by the at least one wind generator 110 and the power command value 620 calculated by the power management system 130.

The power management system 130 may control the BESS 120 to charge or discharge the electric power corresponding to the gap generated between the generated power 610 and the power command value 620 to the BESS 120. For example, if the generated power 610 is greater than the power command value 620, the power management system 130 may control the BESS 120 to charge the BESS 120 with the power corresponding to the difference. For another example, if generated power 610 is less than power command value 620, power management system 130 may control BESS 120 to discharge the difference in power to BESS 120. .

As a result, the power system outputs the same power as the power command value 620 calculated by the power management system 130.

In order to calculate the power command value, the power management system 130 collects the generated power 610 of the at least one wind generator 110 from the first power meter 140. In addition, the power management system 130 may calculate the power command value by using Equation 1, and when α is set to 0.9 in Equation 1 to calculate the power command value, the same value as in FIG. 6A is obtained. You get

Referring to FIG. 6A, it can be seen that the power command value 620 is drawn in a gentle curve compared to the generated power 610. That is, the wind power generation system 100 may output power to the power system more stably than the generated power 610 produced by the at least one wind generator 110 under the control of the power management system 130.

This fact can also be seen in FIGS. 6B and 6C. 6B and 6C, it can be seen that the increase / decrease rate of the generated power 610 is greater than the increase / decrease rate of the power command value 620.

 7A is a graph showing a second embodiment of the generated power and the power command value. 7B is a graph showing instantaneous increase and decrease rates of the generated power and the power command value according to the second embodiment. 7C is a graph showing an average increase and decrease rate of the generated power and the power command value according to the second embodiment.

In FIG. 7A, as illustrated in FIG. 6A, the generated power 710 produced by the at least one wind generator 110 and the power command value 720 calculated by the power management system 130 are shown.

However, unlike the power command value 720 illustrated in FIG. 6A, the power command value 720 illustrated in FIG. 7A is characterized in that the increase / decrease rate does not exceed a preset reference value. To this end, the power management system 130 collects the generated power 710 of the at least one wind generator 110 from the first power meter 140, and calculates the power command value by using Equation 1. Can be. On the other hand, the power management system 130, when the increase and decrease rate of the calculated power command value exceeds the reference value (RR), the power using one of [Equation 4], [Equation 5], and [Equation 6] The reference value can be changed. At this time, the power management system 130 is set to [Equation 1], [Equation 4], [Equation 5], and [Equation 6], α is 0.9, RR is 300kW / min and the power command value When calculated, the same value as in FIG. 7A is obtained.

It can be seen that the power command value 720 illustrated in FIG. 7A is drawn in a gentle curve compared to the generated power 710. That is, the wind power generation system 100 may output power to the power system more stably than the generated power 610 produced by the at least one wind generator 110 under the control of the power management system 130.

7B and 7C, it can be seen that the power command value 720 according to the second embodiment does not exceed the reference value RR of 300 kw / min. That is, the power command value 720 according to the second embodiment is more stably output when compared with the power command value 620 according to the first embodiment described with reference to FIGS. 6A to 6C as well as the generated power 710. It means being.

8 is a flowchart illustrating a method of managing power by a power management system.

Referring to FIG. 8, the power management system 130 checks a ready state (S801). The power management system 130 may set an initial value and check an initial operating condition.

Specifically, first, the power management system 130 checks the driving state and the connection state of the at least one wind generator 110 or BESS (120). For example, the power management system 130 may request generating power information from each of the at least one wind generator 110 or request charging 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.

In addition, the power management system 130 checks whether the wind data exceeds a certain number. The power management system 130 may preset a minimum number of data necessary for calculating the power command value.

If the wind data exceeds a certain number, the power management system 130 may check whether the charging amount of the BESS 120 is included between the initial minimum charging amount and the maximum charging amount.

When the charge amount of the BESS 120 is less than the minimum charge amount, the power management system 130 may control the BESS 120 to charge the energy storage device with the power produced by the at least one wind generator 110.

On the other hand, when the charge amount of the BESS 120 exceeds the maximum charge amount, the power management system 130 may control the BESS 120 to discharge power from the BESS 120.

When the charge amount of the BESS 120 is included between the minimum charge amount and the maximum charge amount, the power management system 130 may terminate system preparation and start control of the BESS 120.

When the ready state is confirmed, the power management system 130 calculates a current power command value based on the generated power of the at least one wind generator 110 (S802). The power management system 130 collects generated power from the at least one wind generator 110 and calculates a current power command value based on past generated power.

In one embodiment, the power management system 130 may generate smoothing data by applying smoothing weights that decrease in reverse order of measurement time to each of the generated powers, and add the smoothing data to obtain a current power command value. At this time, since the smoothing weight decreases in the reverse order of the measurement time, the power command value corresponds to the moving average value calculated by giving higher reliability to the recent wind data.

Next, the power management system 130 checks whether the increase / decrease rate of the current power command value exceeds the reference value, and if it exceeds, changes the current power command value so as not to exceed the reference value (S803 and S804).

Hereinafter, a method of changing the current power command value will be described in detail with reference to FIG. 8.

9 is a flowchart illustrating a method of changing a current power command value according to an embodiment of the present invention.

Referring to FIG. 9, the power management system 130 checks the increase / decrease rate with respect to the past power command values (S901). At this time, the past power command values represent power command values within a certain time in the past from the present time. For example, assuming that the power command value is calculated every second, the past power command values are calculated within the past 60 seconds from the current time t, WTP t -60 , WTP t -59 , WTP t -58 , ..., WTP t -1 . Meanwhile, the increase / decrease rate with respect to the past power command values represents a difference between the maximum value and the minimum value among the past power command values.

Next, when the increase / decrease rate for the past power command values exceeds the reference value RR, the power management system 130 checks whether the current power command value is less than or equal to the minimum value of the past power command values (S902 and S903).

If the current power command value is less than or equal to the minimum value of the past power command value, the power management system 130 changes the current power command value to have a value greater than the minimum value of the past power command value (S904).

In one embodiment, the power management system 130 may recalculate and change the current power command value using Equation (5).

If the current power command value is greater than the minimum value of the past power command value, the power management system 130 changes the current power command value to have a value smaller than the maximum value of the past power command value (S905).

In one embodiment, the power management system 130 may recalculate and change the current power command value using Equation 4.

On the other hand, the power management system 130 is the minimum value of the past power command value, if the current power command value is less than or equal to the minimum value of the past power command value, even if the increase or decrease rate for the past power command values does not exceed the reference value RR. The current power command value is changed to have a larger value (S902, S906, and S907).

In one embodiment, the power management system 130 may recalculate and change the current power command value using Equation 6.

Referring back to FIG. 7, the power management system 130 determines whether charging or discharging is performed using the power command value and the generated power of the at least one wind generator 110 (S905). Specifically, if the power command value is larger than the generated power, the power management system 100 determines the charging of the BESS. On the other hand, when the power command value is smaller than the generated power, the power management system 100 determines the discharge of the BESS.

Next, the power management system 130 controls the operation of the BESS according to whether the charge and discharge (S906). Specifically, when the charging is determined, the power management system 130 determines the difference between the power command value and the generated power as the charging amount, and controls the operation of the BESS 120 to charge the power corresponding to the determined charging amount. In addition, when the discharge is determined, the power management system 130 determines the difference value between the power command value and the generated power as the discharge amount, and controls the operation of the BESS 120 to discharge the power corresponding to the determined discharge amount.

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 (15)

  1. A communication gateway for receiving wind data including the generated power of the wind generator from a power meter, and transmitting charge / discharge control data for the BESS to the BESS; And
    Determining a power command value for the power output to the power system using the wind data, and comparing the determined power command value and the generated power to determine whether or not to charge and discharge the battery energy storage system (BESS), the determined And a controller for generating charge / discharge control data for the BESS according to charge / discharge.
    The power command value is a power management system, characterized in that the increase and decrease rate during the unit time is less than or equal to the reference value.
  2. 2. The apparatus of claim 1,
    A power command value calculation unit for calculating a moving average value for the generated electric power and determining the calculated moving average value as the power command value; ?
    A increase / decrease rate limiting unit for checking whether the increase / decrease rate during the unit time with respect to the power command value exceeds the reference value; Power management system, characterized in that.
  3. The method of claim 2, wherein the increase and decrease rate limiting unit,
    A increase / decrease rate confirming unit which checks a rate of increase / decrease by calculating a difference between a maximum value and a minimum value among past power command values within a certain period of time from the present time point; And
    And a power command value changing unit configured to determine a current power command value as a value between the maximum value and the minimum value when the increase / decrease rate exceeds the reference value.
  4. The power command value changing unit according to claim 3, wherein
    And if the current power command value is less than or equal to the minimum value, determine the current power command value as a value larger than the minimum value.
  5. The power command value changing unit according to claim 4, wherein
    If the current power command value is less than or equal to the minimum value,
    Figure 112012109768918-pat00008
    Recalculate and change the current power command value, wherein α is a constant greater than 0 and less than or equal to 1, WTPt is the power command value at time t, and WTt-1 is time t-1. Power generation system, wherein the RR represents a reference value.
  6. The power command value changing unit according to claim 3, wherein
    And when the current power command value is greater than the minimum value, determine the current power command value as a value smaller than the maximum value.
  7. The power command value changing unit according to claim 6,
    If the current power command value is greater than the minimum value,
    Figure 112012109768918-pat00009
    Recalculate and change the current power command value, wherein α is a constant greater than 0 and less than or equal to 1, WTPt is the power command value at time t, and WTt-1 is time t-1. Power generation system, wherein the RR represents a reference value.
  8. The power command value changing unit according to claim 3, wherein
    Even if the increase / decrease rate does not exceed the reference value, if the current power command value is less than or equal to the minimum value,
    Figure 112012109768918-pat00010
    Recalculate and change the current power command value, wherein α is a constant greater than 0 and less than or equal to 1, WTPt is the power command value at time t, and WTt-1 is time t-1. Power generation system, wherein the RR represents a reference value.
  9. The power command value changing unit according to claim 3, wherein
    If the current power command value is greater than or equal to the maximum value,
    Figure 112012109768918-pat00011
    Change the current power command value to a value smaller than the maximum value, wherein α is a constant greater than 0 and less than or equal to 1, wherein WTPt is a power command value at time t, and WTt-1 is Generating power at time t-1, wherein RR represents a maximum increase and decrease rate.
  10. The power command value changing unit according to claim 3, wherein
    If the current power command value is smaller than the maximum value,
    Figure 112012109768918-pat00012
    Change the current power command value to a value greater than the minimum value, wherein α is a constant greater than 0 and less than or equal to 1, WTPt is a power command value at time t, and WTt-1 is time Power generation system at t-1, wherein the RR represents the maximum increase and decrease rate.
  11. The power command value changing unit according to claim 3, wherein
    Even if the increase / decrease rate does not exceed the reference value, if the current power command value is greater than or equal to the maximum value,
    Figure 112012109768918-pat00013
    Recalculate and change the current power command value, wherein α is a constant greater than 0 and less than or equal to 1, WTPt is the power command value at time t, and WTt-1 is time t-1. Power generation system, wherein the RR represents a maximum increase and decrease rate.
  12. The power command value calculation unit according to claim 2,
    Figure 112012109768918-pat00014
    Calculates the electric power command value using the?, Wherein? Is a constant greater than 0 and less than or equal to 1, WTPt is the power command value at time t, and WTt-1 is the generated power at time t-1 Power management system, characterized in that for representing.
  13. At least one battery energy storage system (BESS) for charging a battery generated by at least one wind generator in a battery or discharging power stored in the battery to a system; And
    Collect the generation power information of the at least one wind generator, and determine the power command value for the power output to the power system using the collected power generation information, the increase and decrease rate during the unit time for the power command value A power generation system including a power management system that limits below the reference value, and controls the charge and discharge of the at least one BESS in accordance with the determined power command value.
  14. The power management system of claim 13, wherein
    From the present time, the increase and decrease rate is confirmed by calculating a difference between the maximum value and the minimum value among the past power command values within a certain period in the past, and when the increase or decrease rate exceeds the reference value, the current power command value Wind power generation system characterized in that determined by the value.
  15. The power management system of claim 13, wherein
    The increase / decrease rate is confirmed by calculating a difference between the maximum value and the minimum value among the past power command values within a certain period of time from the present time point. A wind power generation system, characterized in that determined by the power command value.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002027679A (en) 2000-07-10 2002-01-25 Mitsubishi Heavy Ind Ltd Method and apparatus for controlling wind power generation
JP2003083229A (en) 2001-09-06 2003-03-19 Mitsubishi Heavy Ind Ltd Wind power generation control device and control method therefor
JP2006280020A (en) 2005-03-28 2006-10-12 Tokyo Electric Power Co Inc:The Integrated power turbine generator system
JP2007306670A (en) 2006-05-09 2007-11-22 Fuji Electric Systems Co Ltd Power stabilization system, and power stabilization control program and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002027679A (en) 2000-07-10 2002-01-25 Mitsubishi Heavy Ind Ltd Method and apparatus for controlling wind power generation
JP2003083229A (en) 2001-09-06 2003-03-19 Mitsubishi Heavy Ind Ltd Wind power generation control device and control method therefor
JP2006280020A (en) 2005-03-28 2006-10-12 Tokyo Electric Power Co Inc:The Integrated power turbine generator system
JP2007306670A (en) 2006-05-09 2007-11-22 Fuji Electric Systems Co Ltd Power stabilization system, and power stabilization control program and method

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